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[[quoteright:319:[[WebComic/LeagueOfSuperRedundantHeroes http://static.tvtropes.org/pmwiki/pub/images/superredundantsky.png]]]]

->''Red sky, take warning. Bloodshed by morning.''

->''Red skies at night, sailor's delight. Red skies at morning, sailor take warning.''

Clouds are symbolic. White, fluffy ones mean happiness and light. Looming grey ones mean doom, disaster and, more prosaically, bad weather. They're no less ominous in fiction, as evidenced by the tropes AStormIsComing and the ClicheStorm. But what if the sky is red?

Often the clouds being talked about are more... direct than their symbolic cousins. They're not just a sign or symptom of impending [[TheEndOfTheWorldAsWeKnowIt doom and disaster]], they ''are'' the impending doom and disaster. Maybe they're a mass of enemies so large that they just ''look'' like a cloud, or maybe they're some ghostly beast of a supernatural nature. Maybe they burn. Or maybe they just hang there looking ominous and threatening to unleash something awful, which never happens because the player/watcher either sees the story through to a HappyEnding or [[NightmareFuel turns off the television]]. Or maybe it's nothing more than a visual representation of a story being dark and edgy. Whatever they are, you'd better believe it won't be good.

Evil clouds are not ''necessarily'' red, but this is still [[GoodColorsEvilColors the general colour of choice]]: Red signifies a hazard in the West, so showing clouds in a crimson hue automatically flags them as dangerous. When the clouds roll red, it's time to run.

There is some TruthInTelevision to this, namely in the latter half of the "Red skies at night, sailor's delight. Red skies at morning, sailor take warning" adage. This is due to two things: 1. storms usually move from west to east, and 2. the sun sets in the west and rises in the east. In other words, approaching clouds will be illuminated in red in the morning, usually a sign of rainy weather to come. Clouds going away will be illuminated red in the evening, a sign of dry weather.

Subtrope of PortentOfDoom. See also DeathFromAbove. [[JustForFun/IThoughtItMeant Not to be confused with]] RedEyesTakeWarning. Related to RedSkiesCrossover (when the source of the red skies is someone else's problem.)



[[folder:Anime & Manga]]
* Night time in ''Anime/{{Hellsing}}'' seems to always feature red skies.
* The "Catastrophe" arc of the ''Manga/{{Gantz}}'' features a red sky that heralds the [[spoiler:AlienInvasion]].
* In ''Anime/RebuildOfEvangelion'', [[spoiler:during 2.0 Shinji causes the start of the Third Impact. Guess what the color of the sky is.]]
* ''Manga/{{Naruto}}'':
** Members of the Akatsuki organization can be identified by their black cloaks with a pattern of red clouds.
** The only colors in the Tsukuyomi illusion are black, white, and red. Especially ominous is the red moon when Itatchi tortures Kakashi.
* In ''Manga/YuYuHakusho'', when the demon bugs start appearing in Mushiyori ("Swarm" in the dub and "Swarm City" in the manga), the sky turns red.
* Red skies show up several times in ''Manga/{{Berserk}}'', usually when Guts or the Hawks have to fight one of the many demons of the series, particularly [[spoiler: during the Eclipse]].
* The sky briefly turns red when Asura is released in ''Manga/SoulEater'', and later on when Arachne uses him to increase the spread of insanity throughout the world. Appropriately, the only 'blue sky' left is in the [[BiggerOnTheInside Death Room]]. Once Asura is defeated, the sky immediately returns to normal.
* Happens in the ''VideoGame/SengokuBasara'' anime whenever we see UsefulNotes/OdaNobunaga's hideout, complete with DramaticThunder.
* Happens in ''Anime/YuGiOh5Ds'' when [[spoiler: Aporia comes into existence.]]
* In the first episode of ''Anime/SaintSeiyaOmega'', the sky turns red right before [[BigBad Mars]] appears to kidnap [[BigGood Saori]].
* ''Anime/DanganRonpa3'': In ''Side: Future'', the sky is ''always'' red. [[spoiler: Might be jutsified, as it takes place AfterTheEnd.]]
* ''Manga/HeavensLostProperty'': When [[spoiler: Hiyori]] returns from the dead (more or less) she has been corrupted. When the main cast finds her, the sunny sky turns deep purple as she reveals how much she was changed. Justified, because she was given [[@/WeatherManipulation weather control powers]].

[[folder:Comic Books]]
* In Franchise/TheDCU, they have red skies, which includes the clouds, whenever there is a major reality-threatening crisis. This was lampshaded in ''Joker: Last Laugh'', when the Joker, during his vast campaign against all of humanity, complained that he didn't warrant having anti-matter waves and red skies. In ''DC Universe'' #0, the prologue to ''ComicBook/FinalCrisis'', this was explained by "the Bleed" (the space between universes and "life-blood" of the Multiverse) seeping through into the material universes due to damage to the structure of the cosmos.
* In Comicbook/{{Supergirl}} story arc ''Comicbook/ManyHappyReturns'', a red sky was Linda's clue that their time was running out and the original Supergirl had to be sent back to Earth-One at once before TheMultiverse collapsed because Kara didn't fight the Anti-Monitor.
* As said by the ''ComicBook/MouseGuard'':
-->''Red sky at night, Guard Mouse's Delight. Red sky in morning... Guard Mice take warning.''
* ''ComicBook/{{Hellblazer}}'' once put John Constantine in a twisted nightmare/facet of Hell sort of version of America, with a monotonous dull blood red sky. John is... less than thrilled.

[[folder:Fan Works]]
* The sky of the ''[[http://www.tthfanfic.org/Story-14421/spaceman+Halloween+World.htm Halloween World]]'' is permanently and globally red, as well as being the source of much weirdness.
* In ''FanFic/TheStoryToEndAllStories'', the Nothing's arrival is indicated by dark, ominous clouds.

[[folder:Films -- Animation]]
* In ''WesternAnimation/MyLittlePonyEquestriaGirlsRainbowRocks'', after the Dazzlings summon their siren avatars, the sky turns from indigo to a threatening red.
* In''WesternAnimation/TheSecretOfNimh'', the sky temporarily turns red during Justin's fight with Jenner.

[[folder:Films -- Live-Action]]
* The rolling doomclouds from ''Film/IndependenceDay'' caused by the city destroyers entering Earth's atmosphere.
* ''Film/{{Flash Gordon|1980}}'' (1980). The clouds in front of the plane Flash and Dale are in, which are part of Emperor Ming's attack on the Earth (fiery hail).
* Referenced in ''Film/TheGreatRace''. Maximilian explicitly quotes the koan, only for the film to cut to the ensuing storm.
* To quote Legolas from ''Film/TheLordOfTheRings:''
-->'''Legolas:''' [[CaptainObvious The red sun rises]]. Blood has been spilled this night.
* This happens in ''Film/SinCity'' in ''The Big Fat Kill'', when the girls of Old Town are revealed to have surrounded [[TheDragon Manute]] and his men in an alleyway and rain down a fire of bullets on them.
* ''Film/GokeBodySnatcherFromHell'' starts off with a severe case of this.
* Fully justified in the Sci-Fi Channel movie ''Film/DeathlandsHomewardBound'', as it's a sign the [[DeathWorld chem clouds]] are heavy. With [[HostileWeather acid rain]].
* Done in ''Film/{{Godzilla 2014}}'' for night time scenes of the places that Godzilla has demolished, as a result of all the burning buildings.
* Somewhat parodied in ''Film/TheBurbs''. The film DOES take on a somewhat more creepy tone after that scene.
-->'''Ricky Butler:''' Green sky tonight... Green sky at morning... neighbor take warning.\\
'''Ray Peterson:''' Green sky at night?\\
'''Ricky Butler:''' Neighbor take flight?

* ''Literature/TheLordOfTheRings'':
** {{Mordor}} is blanketed by a perpetual red cloud cover, at least in the movies. The air was said to be poisonous there, so it's a similar idea. In the original books, it's not clouds, but masses of smoke from Mount Doom. Sauron deliberately summoned it up to hide under it, covering his preparations for his attack on Gondor (but ''also'' making "spy" hobbits harder to detect, which actually worries him).
** Also subverted in ''The Return of the King'' (book only) when, after the Ring is destroyed, Sauron rises as a vast anthropomorphic cloud of dark smoke from the Dark Tower and appears to threaten the armies of Gondor -- only to be swept away, impotent, by the wind from the West. Happens again in a very similar manner to Saruman at the end.
* In ''Literature/FactionParadox'''s [[EldritchLocation the Eleven-Day Empire]] the sky's always blood-red, like something's burning beyond the horizon, forever and ever...
* The World of Rod described in ''Literature/LabyrinthsOfEcho'' has red sky over one of its continents, not the most dangerous or safe. Theories vary, up to "the sky here reflects sands of Red Desert under it". In the Heart of the World ''any'' changes of sky color upset people. In the era of clashing dozens of magical orders, the sky was painted constantly, and just from statistics of celestial hues it was clear which one's adepts are stronger. Even the Great Magister of the only surviving order and a great aestheticist dared not to play with this (after the threat of magic overuse was gone): people remembering the civil war are still around.
* In ''Fear Nothing'' and ''Seize the Night'' by Creator/DeanKoontz, the world visited through the egg room in Fort Wyvern has a blood-red sky, fleshy black trees, and hellish {{puppeteer parasite}}s.
* In ''Literature/TheNightsDawnTrilogy'', given enough [[spoiler:possessors]] they will begin to use their [[RealityWarper reality dysfunction powers]] to create a red glowing cloud above their territory -- which, given the speed with [[TheVirus which they spread]] usually means a planet. This is a psychological urge for them, and a prelude to [[spoiler: removing the planet from the normal space time continuum]].
* ''Franchise/{{Dune}}'': In ''Literature/HereticsOfDune'' the sky of the planet Tleilax (home of the Tleilaxu masters, Face Dancers, Axolotl tanks, and a multitude of other dangerous and/or morally questionable things) is described as being an intense carnelian (a deep, reddish-brown) color.
* In the second ''Literature/WarriorCats'' book, the morning that [=WindClan=] arrives home, their medicine cat, Barkface, announces that the clouds are stained with blood, and the day will bring an unneccessary death. This comes true when Fireheart and Graystripe head home -- rather than taking the long way around [=RiverClan=] territory to get home like they're supposed to, they take a shortcut through it. A patrol spots them and starts a fight, and one of the [=RiverClan=] warriors dies when he falls into the gorge.
* ''Raft'', the first published book of the ''Literature/XeeleeSequence'', takes place in a micro-galaxy in another universe (everything but life forms is smaller due to the higher gravitational constant). The galaxy is dying and must be evacuated. Guess what the most visible sign of the situation is.
* Alluded to in [[Creator/ArthurMachen Arthur Machen's]] ''Novel of the White Powder''. Though it's implied to be nothing but an ordinary sunset, Francis Leicester cheerfully describing the sky as "as if the great city were burning in flames and [...] raining blood", while apparently considering fire and blood "a pleasant evening" is one of the first big signs that there's something seriously wrong with him. [[SlowTransformation It]] [[TheCorruption gets]] [[BodyHorror worse]].

[[folder:Live-Action TV]]
* ''Series/DoctorWho'':
** The Easter Special [[Recap/DoctorWhoS30E15PlanetOfTheDead "Planet of the Dead"]] involved the characters being stranded on a desert planet [[spoiler:comprised entirely of the deconstructed bodies of an entire civilisation]] and encountering what, from a distance, looks like a gigantic sandstorm heading their way. This in itself would be bad enough, but as it turns out [[spoiler: it's ''not'' a storm, it's a living swarm of billions upon billions of sting-ray like creatures that survive by completely deconstructing and using the energy of entire civilisations -- as they have already done with this world.]]
** [[Recap/DoctorWhoS30E5ThePoisonSky "The Poison Sky"]] has the sky turning red with poison.
* The end of the episode "Red Sky" in the ''Series/{{V|2009}}'' 2009's remake when [[spoiler:Anna finds out her soldiers were blown up in her spaceship by Erica causing her to breakdown and scream.]]
* ''Series/TheFades'' features this in the final episode. [[spoiler:After Paul reopens Ascension, the final shot of the series is a [[PanUpToTheSkyEnding pan up to the sky]], indicating that [[SequelHook something very bad is about to happen]].]]
* In the ''Series/StarTrekTheOriginalSeries'' episode [[Recap/StarTrekS2E1AmokTime "Amok Time"]], Vulcan's sky is scarlet when [[PowerTrio Kirk, Spock, and McCoy]] arrive for Spock's wedding, almost as though it knows [[InvoluntaryBattleToTheDeath what will happen]] before our hapless heroes do.
* In the finale of ''Series/{{MASH}}'', Klinger is admiring the reds from the setting sun when Potter says it would look a lot better if it was in the west. Turns out he's seen this before; a wildfire.

* [[ExactlyWhatItSaysOnTheTin "Blood Red Skies"]] song by Music/JudasPriest.
* "The Unforgiving Blade" by Hammerfall.
* [[http://www.youtube.com/watch?v=6uRwiWi0dvI "Red Skies"]] by Music/TheFixx.
* "Raining Blood" by Music/{{Slayer}} includes the line "Sky is turning red"
* "Under The Red Sky" by Music/BobDylan.
* "[[http://www.jamendo.com/en/track/381227 "Black Wing Butterfly"]] by Sekshun 8 is "Soaring through the dreadful red sky".
* "[[http://www.youtube.com/watch?v=VNX5f8bwJGs "Red Sky"]] by Music/{{Thrice}}.
* [[https://www.youtube.com/watch?v=Dy6MpsDPKts "Paradise (What About Us?) ft. Tarja"]] by Music/WithinTemptation includes the line "Blood red skies, I feel so cold".

* Jesus uses this phrase as the religious scholars asked him for a sign, rebuking them.[[https://www.biblegateway.com/verse/en/Matthew%2016%3A2 "Matthew 16:2"]]

[[folder:Tabletop Games]]
* Avernus (top layer of LawfulEvil plane in ''TabletopGame/{{Planescape}}''-based ''TabletopGame/DungeonsAndDragons'' cosmology) has it. Take war-torn wasteland, scrapyard, FireAndBrimstoneHell and mix unholy hybrid combining their worst traits -- it will be Avernus. And it's the ''least'' horrible of the Nine Hells.
* ''TabletopGame/GammaWorld'' adventure ''Alpha Factor''. One possible weather condition is "acid rain" (with real acid). It falls from an unusual storm system with red-tinged clouds.

* The lighting is done to invoke this in ''Theatre/{{Finale}}'', as the characters [[spoiler:walk into the burning sunset and to their deaths]].

[[folder:Video Games]]
* The final battle in ''VideoGame/DragonAgeOrigins'' has this... though it might only be the burning city of [[spoiler: Denerim.]]
* The final sequence of ''VideoGame/AssassinsCreedBrotherhood'' has this, as Ezio travels through Spain to face his nemesis.
* ''Franchise/TheLegendOfZelda'':
** ''VideoGame/TheLegendOfZeldaOcarinaOfTime'':
*** In the Ganondorf-dominated future, Death Mountain is perpetually surrounded by a red ring of fire instead of clouds. Once the boss is defeated the fire goes away and is replaced by the standard clouds.
*** As opposed to Castle Market Town and Ganondorf's tower ''perpetually'' being covered in brimstoney clouds and dark backgrounds. It's probably from the lava pit just around the corner, though.
** In ''[[VideoGame/TheLegendOfZeldaMajorasMask Majora's Mask]]'', the horizon takes on a red hue on the night of the final day. In the 3DS remake, the entire sky on the final night is blood red, complete with clouds of dark swirling energy.
** ''VideoGame/TheLegendOfZeldaBreathOfTheWild'' has the sky turn a bloody red every few days on the stroke of midnight when Calamity Ganon uses his power to revive all the monsters you killed. The event is nicknamed "[[BadMoonRising Blood Moon]]" by several characters in game.
* ''Franchise/TheElderScrolls'':
** In ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'', the skies over [[{{Mordor}} Red Mountain]] have been a swirling red blight storm ever since [[BigBad Dagoth]] [[PhysicalGod Ur]] [[KingInTheMountain reemerged]]. After you complete the main quest, the skies clear for the first time in centuries.
** In ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'', the skies of the [[IDontLikeTheSoundOfThatPlace Deadlands]] (the [[EldritchLocation Daedric plane]] of [[BigBad Mehrunes Dagon]], [[OurGodsAreDifferent Daedric Prince]] of [[DestroyerDeity Destruction]], and the closest thing to a FireAndBrimstoneHell in the setting) are red. This goes not only for the sky and clouds, but also the visible stars and nebulae. Within Mundus, the mortal plane, a red sky means you are approaching an Oblivion Gate. Expect to see some of Dagon's [[OurDemonsAreDifferent lesser Daedra]] [[LegionsOfHell minions]].
** Coldharbour is the realm of Molag Bal, Daedric Prince of [[TheCorrupter Domination and Corruption]]. It is said to have a BloodyBowelsOfHell aesthetic, and the sky is not only red, but actively ''on fire''. However, when you actually get to visit it in ''[[VideoGame/TheElderScrollsOnline Online]]'', this [[GameplayAndStorySegregation is not the case]].
* ''VideoGame/EarthBound'': Giygas is not really a cloud per se, but he is red and vaporous.
* The rolling distant red clouds in the point and click game ''VideoGame/{{Exmortis}} 2'' which inspired this trope (found [[http://www.newgrounds.com/portal/view/303832 here]]). The player is racing against time to solve the puzzle and get out before the clouds get to him, these clouds actually being the Exmortis themselves and therefore very dangerous. While the red clouds indicate the Exmortis are approaching, a red ''sky'' is present throughout the game as a sign of the Exmortis' domination of Earth.
* In the original ''VideoGame/StarFox/Starwing'', the first level Corneria is different for each difficulty setting/route. On the third and hardest one, the normally blue sky is replaced with an ominous red one, presumably from the sunset (or sunrise, as the 'normal' boss has a "cameo" as a set of parts being carried around), and the level has hiked up the difficulty.
* ''VideoGame/{{Warcraft}}'':
** When the orcs started worshiping demons and practicing warlock magic, they inadvertently turned the sky of their home world from blue to red. Good things did ''not'' result.
** In the final Orc mission of ''Warcraft III'', which pits Thrall's New Horde and human allies against Grom Hellscream's corrupted Warsong Clan, the red sky heralds the demons called to reinforce Grom -- [[DeathFromAbove falling Infernals]].
--->'''Jaina:''' Thrall! The sky is ''[[OhCrap burning!]]''\\
'''Thrall:''' This is no natural storm. [[OhMyGods Blessed ancestors...]] Everyone, brace yourselves!
* Similarily in the ''VideoGame/WorldOfWarcraft Cataclysm'' expansion, [[BigBad Deathwing]] flies around at random scorching cities and other areas, incinerating anyone unlucky enough to be outside. His coming is noted by a dramatic change in the sky from "clean blue skies" to "red and on fire". Unfortunately this is actually a [[SubvertedTrope subversion]] because there's an [[DeathIsASlapOnTheWrist achievement for dying to Deathwing's flames]]. A [[http://www.thedailyblink.com/2010/11/double-secret-reverse-psychology/ webcomic took note]] on the absurdity of it all.
* In ''VideoGame/{{STALKER}}'', repeated lightning strikes and the sky turning red means an emission is in progress, and it's high time to find shelter if you want to avoid ([[PlotArmor almost]]) certain death, [[OurZombiesAreDifferent or worse]]. During the course of the blowout, it's guaranteed that ''all the light in the Zone'' will turn a vivid blood red.
* In ''VideoGame/CommandAndConquerRenegade'', Nod's superweapon (a beacon that calls a [[SlapOnTheWristNuke nuke]]) turns the sky red before it strikes.
* ''VideoGame/{{Touhou}}'':
** This trope is the driving force behind ''Embodiment of Scarlet Devil'': a red mist has covered Gensokyo and is strong enough to block out the sun.
** ''Scarlet Weather Rhapsody'' has red clouds show up at the same time as a series of bizarre weather events... and earthquakes.
* In ''VideoGame/{{Iji}}'', the second time the [[PlanetKiller Alpha Strike]] is shown charging up at the end of the game, the sky is ominously red. However, that's because the scene takes place at sunrise, not due to anything about the Alpha Strike, since the first time we see it used, the sky is blue.
* When things really start going downhill in ''VideoGame/{{Drakengard}}'', the skies take on a hellish red hue. The sky doesn't just change color...it ''shatters into thousands of pieces'' to reveal the red beneath the blue.
* The final battle in ''VideoGame/LuigisMansion'' against King Boo (and Mecha Bowser) takes place among orange/red flame-like clouds on the floating rooftop of the mansion.
* The level ''Boogie Mansion'' in ''VideoGame/WarioLand Shake It'' has a background of ominous purple trees and clouds.
* The AfterTheEnd CrapsackWorld of ''VideoGame/{{Baroque}}'' has a blood-red sky.
* The sky turns red on the 6th and Last Days of ''VideoGame/DevilSurvivor'' [[spoiler: due to the barriers between the Demon World and real world breaking down]].
* In the final chapter of ''VideoGame/TalesOfMonkeyIsland'', the Caribbean sky is turns red, as part of [[spoiler:[=LeChuck=]'s latest]] bid to conquer the seven seas.
* In ''VideoGame/MetroidPrime2Echoes'''s [[DarkWorld Dark Aether]], taking some energy from one of the dark areas turns the sky from purple to red.
* In ''VideoGame/SecretOfMana'' the sky is red when the Fortress has risen.
* The Director's Cut of ''VideoGame/{{Scratches}}'' replaces the sky's dark gray hue of the starting scene with a dark red one.
* The recent ''VideoGame/CallOfDuty'' games from ''VideoGame/ModernWarfare'' onward seem to adore blood-red skies. Whenever something horrible is happening, whether it's a nuclear bomb or a bloody street battle in Hue City, the skies are an ominous shade of red. Sometimes subverted when a terrifying moment or something plot-critical happens under clear blue skies.
* The Wii version of a ''VideoGame/ABoyAndHisBlob'': In the first boss level, the sky is an orange-red hue. The sky also turns red during fights against a final boss and normal again when it is defeated.
* The second half of ''VideoGame/FinalFantasyVI''. However, it's because of the pollution that has reached the sky due to the cataclysm making it impossible to see anything but red (and it's more of a reddish-orange, though if pollution were to ever get ''that'' bad...).
* In ''VideoGame/FinalFantasyVIII'', Esthar's sky turns red and monster-infested resulting from the Lunar Cry triggered by the Lunatic Pandora.
* In ''VideoGame/CityOfHeroes'', the skies over most of Paragon City are a glowing blue because of the War Walls - leftover [[HandWave Hand Waves]] for why you couldn't freely run from one zone to another except in designated spots. Slightly varied in other areas, and in the Rogue Isles and Praetoria, the areas of the two expansions. But, when certain conditions are met (specifically a Halloween event that pops up semi-randomly after a certain quest is completed any time of the year) [[ZombieApocalypse zombies invade]] one of the zones. Guess what color the sky becomes?
* In ''VideoGame/{{Persona 3}}'', the sky turns green and all water turns to blood during the Dark Hour.
* A red sky in ''VideoGame/HalfMinuteHero'' means that you have less than ten ''seconds'' to finish your quest before the stage boss casts a spell to destroy the world.
* Lampshaded in one level of ''[[http://www.kongregate.com/games/TheGamesCenter/legitimate-td Legitimate TD.]]'' The level preview says "That is never a very good thing, is it? The whole 'red sky' thing." [[spoiler:Then comes a [[BigBulkyBomb nuke that takes up almost half the screen.]]]]
* In ''VideoGame/StarControlII'', the Ur-Quan slave shields have a red color. Guess how the sky looks from the surface of, for example, slave-shielded Earth-something mentioned by Starbase Commander Hayes.
* ''VideoGame/{{Doom}}'', of course. The third episode (Inferno), set in Hell itself, has a fittingly blood-red sky. (The fourth episode, Thy Flesh Consumed, has a mostly sunset-yellow sky tinged with red.) Hell, Doom 64 takes it even further. Sometimes the sky is ''on fire.''
* The end of the beta for ''VideoGame/TheMatrixOnline'' features the sky turning red ''[[http://static.giantbomb.com/uploads/original/0/5872/278852-33678258.jpg with eyes,]]'' signifying that the Machines were watching as they prepared to reboot the Matrix.
* Most of ''VideoGame/SuperTanookiSkin2D'' is spent with a red sky. It turns blue once you get your skin back from Mario.
* ''Franchise/TombRaider'':
** ''VideoGame/TombRaiderTheLastRevelation'' uses this in its final stages, by the time mythological monsters have largely replaced human and animal opponents, and Set is about to reform.
** ''VideoGame/TombRaiderII'' uses an unnaturally-colored green sky in the Floating Islands.
* ''Videogame/FalloutNewVegas'': The Sierra Madre is always overcast by a red toxic cloud, adding to the unsettling ambiance.
* The last part of story mode in ''VideoGame/MortalKombatX'' has Shinnok absorbing Earthrealm's energy while corrupting it with his own life force. Shinnok's actions change the sky from normal to a deep, bloody red. Only when Shinnok is defeated and Raiden purges the corruption does the sky return to normal.
* In ''VideoGame/{{sora}}'', you have to fight [[WoobieDestroyerOfWorlds Star Breaker]] at the end of stage 6, up in the sky which has turned red, and it remains the same in stage 7, during the final battle.
* Inferno's skies and clouds in ''VideoGame/Bayonetta2'' are of a lovely blood red coloration. Needless to say, it is a ''very'' dangerous place.

[[folder:Visual Novels]]
* The DarkWorld of ''VisualNovel/ElevenEyes'' is signified by a red sky and a [[WeirdMoon black moon]] that, besides its color, is immensely huge and hanging over the city.
* [[spoiler:After society collapses and the world is reduced to war, chaos, and despair,]] the skies in ''Franchise/DanganRonpa'' are almost perpetually red.

[[folder:Web Animation]]
* ''WebAnimation/BrokenSaints'' loves this one. The original rhyme for sailing is referenced by Gabriel in Chapter 15, Act 1, before a literal storm. And during the final two chapters, [[spoiler: when the EvilPlan is about to unfold/unfolding]], the sky is a scary, unnatural red for the metaphorical storm.

[[folder:Web Comics]]
* In ''Webcomic/{{Furmentation}}'', when the demons attack.
* The homeworld of the Cherubs in ''Webcomic/{{Homestuck}}'' is near a red supergiant, coloring the sky appropriately red. Dave also lived under a red sky before he entered the Medium.

[[folder:Western Animation]]
* ''WesternAnimation/GravityFalls'' does this starting with the episode ''Dipper and Mabel vs The Future''. [[spoiler: When the rift to Bill Cipher's world opens, the sky turns a murky red. This marks the beginning of Weirdmaggeddon, and Bill is more powerful and dangerous than he's ever been before]].
* ''WesternAnimation/StevenUniverse''
** In the episode "Laser Light Cannon", the sky turns bright red as the Red Eye comes crashing down onto the beach.
** Inverted in the episode "The Return". [[spoiler: The nearing Homeworld-ship turns the sky a luminescent green]].
* There is a reason the DarkerAndEdgier latest seasons of the '80s ''WesternAnimation/{{Teenage Mutant Ninja Turtles|1987}}'' cartoon were known as the ''Red Sky'' seasons.
* The sky turns red twice in ''WesternAnimation/AvatarTheLastAirbender'': the first time is when [[spoiler:Zhao captures the moon spirit]], and the second is when [[spoiler:Sozin's comet is passing by]].
* ''WesternAnimation/TeenTitans'' used this trope for the three part finale of the season 4 Raven arc. It was for the [[AfterTheEnd post-prophecy]] world where everyone was [[TakenForGranite turned to stone]].
* In ''WesternAnimation/TheSmurfs'' episode "Lost Smurf", a shifting multicolored sky portends a danger that only Grandpa Smurf knew about -- a mysterious haunted castle that has taken Nanny Smurf away when she went after him.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** In [[Recap/MyLittlePonyFriendshipIsMagicS4E26TwilightsKingdomPart2 "Twilight's Kingdom - Part 2"]], from the moment [[spoiler: the Library Tree is destroyed]] and during the entire Twilight vs. Tirek showdown, the previously blue sky turns red and dark.
** In [[Recap/MyLittlePonyFriendshipIsMagicS5E25TheCutieRemarkPart1 "The Cutie Re-Mark - Part 1"]], the flashback showing the return of King Sombra and his enslavement of the Crystal Ponies is under an ominous red sky. Justified, given his FisherKing abilities.
* ''WesternAnimation/ThePowerpuffGirls'' episode "Tough Love" has the sky turn red when HIM's evil influence is spread throughout Townsville.
* The season 4 finale of ''WesternAnimation/TheAdventuresOfPussInBoots'' involves an AncientEvil being summoned, and with it a blood red sun so strong that everything is colored red by it.
* Any time something dangerous or scary is about to happen in ''WesternAnimation/{{Kaeloo}}'', the sky turns red.

[[folder:Real Life]]
* There are known to be places in the world where poisonous fumes and fogs hang in low gullies -- many animals have died by wandering into these places and not getting out fast enough.
* Smog can sometimes cause the sky to turn red.
* Red (or at least reddish) skies can happen when there's a big fire during a cloudy day or night.
** Or after a large explosion. The reasoning is the same: huge amounts of particulates in the air (ash for the fire, dust for the explosion).
* The traditional saying "red skies at night, sailor's delight; red skies in morning, sailor take warning" (Alternatively, "shepherds delight", and with similar sayings in other languages.) According to Wiki/TheOtherWiki, (see http://en.wikipedia.org/wiki/Weather_lore#Red_sky_at_night ), it's because weather systems usually move from west to east, so red clouds at sunrise would mean the clouds and associated weather are headed towards you, while red clouds at sunset means they've already past. This phenomenon is even mentioned in Literature/TheBible, making it OlderThanFeudalism.
* [[http://en.wikipedia.org/wiki/2009_Australian_dust_storm The 2009 Australian dust storm]], especially during the early hours of the morning in New South Wales and inland Queensland.
* Less ominously, this also can happen on cloudy nights when there is snow on the ground, or on particularly rainy ones with heavy cloud cover. The clouds take on a slightly red tinge. [[https://polymathically.wordpress.com/2015/05/16/weekly-photo-challenge-divisadero-at-dusk/ For example, a sunset affecting clouds over San Francisco]].
* The clouds can also glow reddish if overcast in a city with enough street lights, especially orange [[https://en.wikipedia.org/wiki/Sodium-vapor_lamp sodium-vapor lamps]] prevelant in many cities, resulting in a surprisingly bright night that almost invokes HollywoodDarkness.