In Noah's Ark myth God sent 40 days of rain to flood the Earth. Are any such long periods of persistent rain recorded? What kind of disaster could happen to cover all continents with water?
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1Or at least one whole continent? – Egle Mar 24 '11 at 16:24
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3I suggest changing the title to "Could a Great Flood of happened?", flood myths are common among many religions. – Richard Stelling Mar 24 '11 at 16:27
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5@rjstelling: for example there is an earlier myth in the [Saga of Gilgameš](http://en.wikipedia.org/wiki/Gilgamesh) – Sklivvz Mar 24 '11 at 16:44
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3To be more precise, is this question trying to ask, "Supposing an actual supernatural Great Flood didn't occur, could a similar naturally occurring world-covering flood have occurred?" Otherwise, the question boils down to "Are miracles possible?" – Edward Brey Apr 13 '14 at 22:17
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1I know this is old, but I'm voting to close as too broad. So called "Flood geology" is a vast swath of claims posing as science. "Did the Great Flood happen?" doesn't give an opportunity to actually prove or disprove anything that will convince anybody. But claims like " [there are] several oceans’ worth of water locked up in mantle rocks and minerals" ([source](https://answersingenesis.org/geology/rocks-and-minerals/where-did-earths-water-come/)) are quite answerable. – Dec 28 '18 at 19:26
5 Answers
The talk.origins archive documents an extensive list of claims about the flood. It also includes sections discussing the Ark and the various problems that aspect of story has. There's also a separate article dedicated to the flood.
Are any such long periods of persistent rain recorded?
I don't know about persistent rain, but Seattle has had 30 days of measurable rainfall twice in the past 60 years. It isn't unreasonable to believe that other locations could have had a longer, more aggressive chain of storms, and it's also not unreasonable to expect that there'd be problems with local waterways flooding as a result.
What kind of disaster could happen to cover all continents with water?
There are a few frequently suggested sources of the water. They all fail simple tests. If there was supernatural involvement, we'd also expect to see global evidence of a great flood, but this is absent.
The most logical explanation given the lack of evidence is that the story is mythical.
As @Sklivvz posted in the comments the flood story probably originates from part of the Epic of Gilgamesh which follows the same general plot. The resident deity is upset with humanity and selects one righteous man to be saved. Instructions are given to build a large boat to save all of the animals and the man's family. It rained, though only for six days. Birds are sent out, one doesn't come back, a mountain is found, a sacrifice is made, the resident deity is pleased / remorseful and promises not to do that again.
The talk.origins site hasn't been updated in a while. There was some evidence uncovered somewhat recently that suggested that the myth may have originated when the Black Sea grew rapidly after an influx of water from the Mediterranean in ~5600 BCE. In 2009, National Geographic published a follow-up that suggested the growth in the Black Sea was not as catastrophic as first thought, and might not really be the origin of the myth.

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11The Gilgamesh myth is probably the most well known origin of the biblical myth. One "CYA" attempt by bible literalists is to point out that nearly all mythologies have a flood myth or story of one sort or another. The fact that most human cultures live near seas, rivers, and other bodies of water seems to escape them... – Larian LeQuella Mar 25 '11 at 01:38
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Yep. [Arizona and Colorado](http://library.thinkquest.org/C005854/text/mythfarworld_f.htm) flood a lot. – mmyers Mar 25 '11 at 13:32
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4I should have said "traditionally". And if you look at those two locations, there are actually quite a few flash floods. Having lived in both locations, those things are not to be laughed at. – Larian LeQuella Mar 25 '11 at 14:13
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2Just a note: [40 days and 40 nights is an idiom](http://www.todayifoundout.com/index.php/2010/08/the-biblical-expression-40-days-and-40-nights-just-means-a-really-long-time/). It means "a long time". – cartomancer Aug 10 '13 at 20:13
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@charles what about the stories of a massive flood from natives of the americas, that would have migrated to the americas before the epic of gilgamesh? – Himarm Jun 03 '15 at 21:09
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3@Himarm Floods happen "all the time", and if your worldview tells you that all the places you've ever been are all there is to the world, then a local disastrous flood can seem tremendous. Check out what's happened in the past week in Texas and Oklahoma, for example. There are similar local flood stories in other cultures as well, including a bunch from China. None of these tales match up well enough with the Great Flood mythology or from the likely origin of it in Gilgamesh to act as supporting evidence. – Charles Jun 03 '15 at 21:25
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@Charles actually the south/central america stories have earily similar parts to the story as the bible version when they send out birds to find dry land. im not saying this proves a flood, but thats close enough to wonder how a people who should have been isolated for 9K+ years have such a close story to the middle east. Makes me think that it was a shared story, but from far earlier then originally thought, or migration to the americas happened far after we thought. http://www.manataka.org/page384.html . http://www.native-languages.org/legends-flood.htm – Himarm Jun 03 '15 at 21:38
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How much precipitation fell during those 30-day periods? Seattle has an annual average of 153 days with measurable precipitation and 38 inches of precipitation. That means that the average precipitation measurement for days with precipitation is about 1/4 inch or 6.3 mm. At that rate, serious flooding is unlikely. – phoog Oct 02 '20 at 03:26
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I live in Western Europe, where it rains often but not that much... Visiting Los Angeles we stood looking at one of those immense storm drains, lying empty and dry, and realised that maybe it doesn't rain often there, but it's potentially catastrophic when it does. – RedSonja Oct 02 '20 at 07:24
Given the time this was written, how would anyone know that all the continents were flooded? Let's just assume that the World was flooded, and that the World was considerably smaller. Horizon-to-horizon flooding happens, and if that's all you can see, that means the whole World's flooded.
Although unrelated, the same applies to pairs of "every single animal". This could well be just goats, sheep, chickens and dogs.

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A point often missed about the Noah myth is that it doesn't claim the flooding was all due to rain. It says "the fountains of the deep were opened". Still, this CYA attempt fails, because there isn't enough water on the planet to cover all the land. Even if all the ice on the South Pole melted it would only raise sea level about 60 meters (200 feet).

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8And for a people that survive by trade over seas, even a fraction of that 200 feet would mean the utter removal of their entire world. A reasonable thing for some lone primitive family that survived a truly great flood, would be to say it covered the world. – DampeS8N Mar 24 '11 at 17:54
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7"There isn't enough water on the planet to cover all the land" -- Sure there is. It only depends on how high the continents are at the time, and we already know that e.g. Mount Everest was once part of an ocean floor. – mmyers Mar 24 '11 at 19:11
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3@mmyers, the reason that the Himalayans were part of the ocean floor is because of plate tectonics. NOW there is no way that all the water on the planet could flood even a modest mountain. – Larian LeQuella Mar 25 '11 at 14:14
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10The difference between today and the time the Noah myth supposedly happened is, in geological terms, negligible. So Noah still counts as "now". – clgood Mar 30 '11 at 22:34
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3@mmyers so you're saying that at some point in the past all the earth was flat land, with no geological features taller than maybe a decent sized molehill? And that that happened during a time when humans lived on the earth (and remember, biblical tradition has that time set as a few thousand years, not billions)? – jwenting Sep 14 '13 at 11:57
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@LarianLeQuella but there were other tall mountains when Everest was on the ocean floor, which have in the meanwhile eroded into smaller mountains. Plus there's the whole issue of time scale, where you're either working in the creationist view of a few thousand years or the evolutionist view of a few hundred thousand years, both of which, as others have noted, are essentially instantaneous for the purpose of plate tectonics. – phoog Oct 02 '20 at 03:38
I observe 4 questions here:
- Could a Great Flood have happened?
- Are 40-day-periods of rain recorded?
- What kind of disaster could happen to cover all continents with water?
- Can the Noah's Ark myth be correct? (implicit)
Answers:
- The smaller your universe is, the bigger a flood is. If you don't know that Africa, Europe, Asia, America and Antarctic exist, it's impossible to know that the whole earth is covered.
- I'm sure so; see Charles about Seattle. Investigate weather stations in regions of rain periods.
- To cover Himalaya, Alpen, Anden, Appalachen, Rocky Mountains and so on: Not enogh water. But from rain apart, tsunamis, smelting ice, river outbreaks (rain elsewhere) cause dramatique floods.
- If you know 500 species, most of them small, you can imagine them to fit into a big ship. Today, we know how many different animals there are, and that you need much bigger groups, to have enough genetic diversity to let one survive. But of cause predators need other animals as meal as well. To put all of them, and enough food on a ship, the ship would need to be multiple times the size of the Maracana stadium. So it's just a story.

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1 and 3 are kind of same thing. And I never asked 4. Used Noah's Ark just as example (and as answers show - not best one). Other than that - good answer :) – Egle Mar 25 '11 at 07:54
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Shouldn't `Great Flood`, with capitals, be spelled `great flood` then? I'm sorry - while in many aspects my own English is pretty poor, I allow myself to give hints ... . – user unknown Mar 25 '11 at 08:04
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I noted the same thing: many questions, of which #2 seems quite unrelated to others IMO. – StackExchange saddens dancek Mar 25 '11 at 09:31
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3 is bogus, a tsunami moves water around, meaning somewhere else sea levels drop (and also, its effect is temporary, measured in minutes or at most hours. Noah's flood is supposed to have lasted a long time). – jwenting Sep 14 '13 at 11:54
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@dancek #2 is the traditional explanation for there being enough water for the flood. So it's relevant. – jwenting Sep 14 '13 at 11:55
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2So this question was marked as needing citation, but in an unspecific way. What information needs citation? The Mt. Everest is more than 8800 m high. That's common knowledge. That jewish people in the area of todays Israel where not well educated about the size of the earth and existing continents, does that need citation? Childish questions can't be answered with everyones knowledge? Be specific! And don't introduce such requirements over 3 years later. – user unknown Feb 11 '17 at 18:38
It seems likely that there was a flooding event of some sort which contributed to this legend. Probably the best candidate is the "Black Sea deluge", an event that is believed to have occurred around 5600BC.
What supposedly happened is that the Mediterranean Sea broke through the Strait of Bosporus and flooded the Black Sea (which was, prior to this, much lower than it is now).
The sea, though low, was still quite large, and it's not implausible that there were farmers along its shore who had fairly large boats. Some of these could well have seen the waters rising and herded numbers of their livestock onto their boats to escape the flood.
Note, though, that this theory has numerous critics, and definitive proof is lacking.

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Floods are the most common natural disaster, thus, "some non global flood created the myth" is a common skeptical reply. What's missing in this answer is that explanation. Without already knowing it, one might reply that this Black Sea flood was surely not global. – Oct 01 '20 at 15:04
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Certainly to nearby observers it would have seemed that the flooding "covered all the earth". And the water level would have remained high essentially forever, distinguishing this event from a simple rainfall flood event. – Daniel R Hicks Oct 01 '20 at 17:10
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-1 because the OP doesn't ask for an explanation of the origin of the biblical story, but instead quite explicitly asks three different questions: (1) Are 40 days of rain plausible? (2) Can a flood cover continents? (3) Is an event like the biblical flood at least theoretically possible (this is asked in the title)? None of these questions are addressed here. – Schmuddi Oct 01 '20 at 19:43
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@Schmuddi: If this question, asked in the first couple of months on the site, was asked again today, it would be closed because of the strawman (Believers: "God made it miraculously flood." Naturalists: "Models in Hydrology say that's not possible." Believers: "That's right. God miraculously did the impossible.") Answering it would not distinguish between either of the competing hypotheses. – Oddthinking Oct 02 '20 at 02:16
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It is too few characters for a suggested edit, but you have misspelled _Bosphorus._ – phoog Oct 02 '20 at 03:42
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As @Oddthinking said, the question is badly posed. E.g. "all continents covered with water" does not make any sense in the context of a statement made in the Bible where certainly Noah did not know much about continents let alone be able to distinguish a sea or ocean from "the whole world is covered in water". So the _statement_ cannot be taken at face value, even before analyzing whether it's true. If it is, the statement is a random fluke. – Sklivvz Oct 02 '20 at 05:40
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@Oddthinking and Sklivvz: Well, then let's close the badly posed question for good instead of trying to answer something something that is unanswerable. – Schmuddi Oct 02 '20 at 05:42
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@DanielRHicks So I see! I am puzzled that I haven't encountered that fact before now. – phoog Oct 02 '20 at 14:20