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Massive 70-Mile-Wide Butterfly Swarm Shows Up On Denver Radar System (bbc.com)

dryriver shares a report from BBC: A colorful, shimmering spectacle detected by weather radar over the U.S. state of Colorado has been identified as swarms of migrating butterflies. Scientists at the National Weather Service (NWS) first mistook the orange radar blob for birds and had asked the public to help identifying the species. They later established that the 70-mile wide (110km) mass was a kaleidoscope of Painted Lady butterflies. Forecasters say it is uncommon for flying insects to be detected by radar. "We hadn't seen a signature like that in a while," said NWS meteorologist Paul Schlatter, who first spotted the radar blip. "We detect migrating birds all the time, but they were flying north to south," he told CBS News, explaining that this direction of travel would be unusual for migratory birds for the time of year. So he put the question to Twitter, asking for help determining the bird species. Almost every response he received was the same: "Butterflies." Namely the three-inch long Painted Lady butterfly, which has descended in clouds on the Denver area in recent weeks. The species, commonly mistaken for monarch butterflies, are found across the continental United States, and travel to northern Mexico and the U.S. southwest during colder months. They are known to follow wind patterns, and can glide hundreds of miles each day.

47 comments

  1. what will The Weather Channel name this one? by turkeydance · · Score: 2

    Cynthia?

    1. Re:what will The Weather Channel name this one? by Anonymous Coward · · Score: 0

      teh funnay

      CAPTCHA: Insects

    2. Re: what will The Weather Channel name this one? by Anonymous Coward · · Score: 0

      ead the forecast discussions and you'll actually see the forecaster reasoning behind what goes into the advisories.

      I love forecaster Avila!

    3. Re: what will The Weather Channel name this one? by Anonymous Coward · · Score: 0

      Yep. Uh-huh. Word?

  2. Ahhh, mexican. by Anonymous Coward · · Score: 0

    Illegal immigrants. The wall is going to have to be really high to stop these crafty buggers.

  3. A few issues here by Anonymous Coward · · Score: 5, Informative

    Why would it be unusual to see migratory birds going from north to south this time of year? That seems like what we'd expect from any migratory creature.

    Also, Paul Schlatter knows his stuff, so I don't think it's his error, but rather the reporter. It is very common for flying insects to be detected by radar, despite what the article says. More likely, it's rare to detect swarms of migratory insects. However, we see insects all the time on weather radar, usually seen as an area of relatively low reflectivity compared to storms (say, 10-20 dBZ, compared with 50 dBZ for storms) and it's seen close to the radar where the beam isn't too far above the ground. Sometimes the winds converge and cause the concentration of insects to increase in an area. When the winds converge, the air generally rises, but the insects resist ascending to a higher altitude. We see this a lot of times along fronts, drylines, outflow boundaries, and horizontal convective rolls. They usually appear as a line, usually a few kilometers wide, of stronger reflectivity (perhaps 20-25 dBZ), and it allows us to see where things like fronts and outflow boundaries are. We also use the motion of the insects with increasing height (as the beam gets farther from the radar) to estimate the wind speed and direction in the lowest kilometer or two of the atmosphere.

    When it's warm enough, it's usually very common to detect insects with weather radar. Sometimes this is actually very useful to meteorologists, too.

    1. Re:A few issues here by uvajed_ekil · · Score: 1

      Why would it be unusual to see migratory birds going from north to south this time of year? That seems like what we'd expect from any migratory creature.

      I'm also confused by this. The butterflies were headed South to Mexico (self-deportation does exist!), and shouldn't any migratory birds traveling through Colorado en masse in September or October also be heading South, more or less? Something isn't adding up here.

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    2. Re:A few issues here by Anonymous Coward · · Score: 0

      I think its poorly constructed. The migrating birds were flying north to south, they don't really tell us what way the butterflies were going.

    3. Re:A few issues here by ShanghaiBill · · Score: 1

      I have no idea either, but I am willing to speculate: In Colorado, the transition from prairie to mountains is abrupt, and migrating birds will often follow the front range. Migrating insects are not known to navigate using geographic features as guides, and instead tend to follow wind patterns. The birds tend to be strung out in a N-S direction, and the insect swarm is more likely to be a "blob". So maybe that is what makes the pattern look different.

    4. Re:A few issues here by Anonymous Coward · · Score: 0

      First, great comment. Interesting stuff about radar and insects.

      I think the "north to south" was probably down to a bad and slightly ambiguous phrasing. Instead of 'We detect migrating birds all the time, but they were flying north to south", it may mean more like, "... but they fly north to south", so as to refer to the birds, not the butterflies.

    5. Re:A few issues here by PolygamousRanchKid+ · · Score: 1

      Why would it be unusual to see migratory birds going from north to south this time of year?

      . . . are you suggesting that coconuts migrate . . . ? What would be the wind velocity, and could they grab it by the husk . . . ?

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    6. Re:A few issues here by QuasiEvil · · Score: 1

      Can confirm it's definitely these little guys - they're all over my house the last couple days. It's also going to be a near perfect weekend followed by a very hard freeze and snow on Monday, so there may be some instinctual drive pushing them south along the Front Range.

    7. Re:A few issues here by Bigbutt · · Score: 1

      I've actually had quite a few heading south at my place at 8,200'. Not a swarm but certainly a lot more than I expected to see this time of year.

      [John]

      --
      Shit better not happen!
    8. Re:A few issues here by ezelkow1 · · Score: 1

      Indeed, just leaving work a few days ago when the swarm was first reported, walked by some bushes downtown and a ton of butterflies flew up out of them, never really seen that before downtown

    9. Re:A few issues here by Walter+White · · Score: 1

      I've seen mayfly hatches show up on weather radar along the upper Mississippi river. I've also seen them pile up to about 4" (100mm) deep under street lights.

  4. Alfred Hitchcock. by Anonymous Coward · · Score: 0

    Need to make a horror movie starring a swarm of...butterflies.

    1. Re:Alfred Hitchcock. by sheramil · · Score: 1

      Need to make a horror movie starring a swarm of...butterflies.

      At the start of Bruce Sterling's novel "Schismatrix", there's an assassination via a swarm of genetically modified moths.

  5. Erradicate them all by Anonymous Coward · · Score: 0

    Those butterflies are going to take down an A380, We must ban and eradicate them immediately.

    Have you seen what a collision between a butterfly and full size aircraft will do. They are lethal I tell you and they need to be restricted and licensed!

    1. Re:Erradicate them all by Anonymous Coward · · Score: 0

      Not just "a" butterfly here. This is a butterfly swarm! Can you imagine the windshield?

  6. Actually nanobots... by Anonymous Coward · · Score: 0

    ...disguised as butterflies. The invasion has begun!

    1. Re:Actually nanobots... by Anonymous Coward · · Score: 0

      Unless you're stating that each butterfly is comprised of a swarm of billions of bots, these couldn't be microbots, much less nanobots. They'd have to be something like minibots.

  7. In other news... by Chewbacon · · Score: 1

    ...local high school car washes set fundraising records.

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    Chewbacon
    The Bible is like Wikipedia: written by a bunch of people and verifiable by questionable sources.
  8. By NDA, didn't you mean GNAA? by Anonymous Coward · · Score: 0

    This site is so gay.
     
    Hey Beau, where's the story about RUSSIANS releasing droves of butterflies to jam American radars? Idiot.

  9. Not Butterflies by Anonymous Coward · · Score: 0

    Maybe it was just a squadron of B-2 bombers?

    1. Re:Not Butterflies by Anonymous Coward · · Score: 0

      Shhhh, you will give the game away to Kin!

  10. Ask Ash-Fox about his NDA lie by Anonymous Coward · · Score: 0

    AssFux (lol) tell us about your NDA lie and your dns fuckups apk tore you up on please hahahaha https://slashdot.org/comments.pl?sid=11188265&cid=55322595/

  11. Butterfly effect. by fahrbot-bot · · Score: 1

    Butterflies flap their wings in Denver and radar systems go nuts.

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    It must have been something you assimilated. . . .
    1. Re:Butterfly effect. by Anonymous Coward · · Score: 0

      What if they do cause hurricanes?

      On a serious note, you would think this phenomenon would have already been observed over the past decades of radar observations.

    2. Re:Butterfly effect. by Anonymous Coward · · Score: 0

      Butterflies flap their wings in Denver and radar systems go nuts.

      In Soviet Russia, butterflies flap your nuts!

    3. Re:Butterfly effect. by uvajed_ekil · · Score: 1

      Butterflies flap their wings in Denver and radar systems go nuts.

      ..and all without a single weed joke!? We're slipping.

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    4. Re:Butterfly effect. by Anonymous Coward · · Score: 0

      This has obviously been caused by all the recent massive hurricanes.

  12. And the other blob on the radar? by Gravis+Zero · · Score: 2

    Oh, that's just your mom. ;)

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    1. Re:And the other blob on the radar? by Anonymous Coward · · Score: 0

      That's no mom! That's a space station!

  13. pink stars by Anonymous Coward · · Score: 0

    Are falling down, or some shit, under a fucking dome. But Barbie gets to nail the redhead of the husband he murdered. Little annoying punk ass bitch kids then find and egg, under a mini dome, under the dome, while Barbie rubs his dome over monarch lady. Then our acid trip wears off and we find someone was just fucking with us the entire time and it end right wh

    1. Re:pink stars by Anonymous Coward · · Score: 0

      Back to your cocoon.

  14. Porpoises on radar too by tomhath · · Score: 1

    When I was in the Navy we would pick up schools of porpoises on the radar. The sea has to be perfectly calm when the school approaches, their splashing looks like a small cloud on the radar screen. The sonar picked them up too, sounds like a basketball game with the guys' sneakers squeaking on the floor.

  15. Side note by Ol+Olsoc · · Score: 1
    There was a lot of concern about declining numbers of Monarch butterflies a couple years ago, due in large part to a reduction in their food source, milkweed. So a lot of people were planting milkweed around the perimeters of their properties.

    As well, I spend a lot of time on the mountain roads in Northern Pennsylvania. There are often clearings for gas lines that run alongside the dirt roads. Some people or groups have apparently been dropping milkweed seeds along these miles of clearing. This summer has seen a huge number of Monarch butterflies flitting about. Being a migratory critter that over time and generations heads to Mexico and back, Denver or other places might expect radar clouds of this species as well.

    Final side note - I've been on the Cape May-Lewes Ferry between South New Jersey and Delaware, and you can see Monarchs flying across the bay on a 20 plus mile ride. I've seen them draft the ferry as well, which is a strange sight.

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  16. Re: flying sleeper cells by Anonymous Coward · · Score: 0

    ISIS claimed responsibility for the butterfly swarm. ae911truth dot org

  17. That's nothing by Anonymous Coward · · Score: 0

    One day, creimer rolled his plus-size office chair and the USGS issued an alarm!

  18. Holy cow by DontBeAMoran · · Score: 1

    Imagine the butterfly effect with that many butterflies. We know why there's so many tornadoes in the U.S.A. now!

    Why the hell is it called a BUTTER-FLY anyway?

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    #DeleteFacebook
  19. Fluttering delight by Anonymous Coward · · Score: 0

    There was a ton of them visiting Montreal a few weeks ago, the likes of which had not been seen in decades.

    It was a surprise, then a delight to see that many butterflies at once.

    I hope to see that again.

  20. Related xkcd by fibonacci8 · · Score: 1

    Why the hell is it called a BUTTER-FLY anyway?

    https://xkcd.com/1012/

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