Spectacular cloud holes yesterday

By: Dr. Jeff Masters , 30. tammikuuta 2007 klo 17:01 (GMT)

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An unusually large series of cloud holes developed over Mississippi, Louisiana, Texas, Arkansas, and Alabama yesterday, which were captured by several alert wunderphotographers (see the thumbnail images at the bottom). These cloud holes (also called "dissipation trails" or "distrails") are formed when an aircraft passes through a deck of clouds containing water drops that have cooled below the freezing point of water. The exhaust particles of the aircraft's engines serve as nuclei for the supercooled water drops to freeze on, and the resulting ice crystals fall towards the ground as "fall streaks". Also, engine heat and turbulence along the wing tips mixes moist and dry air, helping create clear holes. It typically takes about 20 minutes for a cloud hole to form after an airplane has passed, so it is not obvious that a aircraft create the holes.


Visible image of the clouds holes of January 29, 2007, as seen by NASA's Terra satellite.

For more detailed information on this event, including animations and upper-air plots, see the University of Wisconsin CIMSS Satellite blog.

I'll have a preview on Wednesday of the upcoming blockbuster climate report scheduled to be released Friday by the U.N. Intergovernmental Panel on Climate Change (IPCC).

Jeff Masters

Alabama Sky (southgirl)
Very cold here in Alabama. Temp this am was 20 degrees. Brrrr
Alabama Sky
Negative Contrail 1 (WeatheringHeights)
Even though I was sick as a dog (and home from work), I went out in the freezing cold this morning and took pictures, when I saw this cloud out the window. I just couldn't miss this one. ;) The second photo is looking west, this one was looking east. I sent it to the Chief Meteorologist at KXAS-TV - NBC5 in Dallas-Fort Worth. Here's what he said.... "It's a kind of 'negative' contrail. Apparently the jet exhaust caused the cirrus cloud layer to condense and fall out as snow, leaving a gap in the clouds. I don't think I've ever seen one like it.
Negative Contrail 1
Cloud1 (eds0736)
Strange
Cloud1

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243. snotly
31. tammikuuta 2007 klo 15:23 (GMT)
Actually it is Friday here on earth near the event horizon of a tiny black hole south of Cleavland - TGIF!
Member Since: 27.08.2005 Posts: 0 Comments: 682
242. weatherboykris
31. tammikuuta 2007 klo 15:18 (GMT)
looks like maybe an EWRC in the cards soon?The southern rainband seems to be getting stronger.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
241. weatherboykris
31. tammikuuta 2007 klo 14:49 (GMT)
got that for any other storms?
Member Since: 9.12.2006 Posts: 125 Comments: 11346
240. weatherboykris
31. tammikuuta 2007 klo 14:49 (GMT)
nice Patrap
Member Since: 9.12.2006 Posts: 125 Comments: 11346
239. weatherguy03
31. tammikuuta 2007 klo 14:25 (GMT)
ENSO predictions and climate change dont mix. Early season tropical predictions will be interesting!
Member Since: 5.07.2005 Posts: 589 Comments: 29691
238. Patrap
31. tammikuuta 2007 klo 14:23 (GMT)
50 frame CIMSS MIMIC of DORA..Vmax 77knots peak Link
Member Since: 3.07.2005 Posts: 414 Comments: 125503
237. biff4ugo
31. tammikuuta 2007 klo 13:51 (GMT)
There was a photo just like this a month or so ago called "dove in a hole"
but now I can't find it. I thought it was some sort of thermal microburst of vertical activity. Didn't think of something as narrow or linear as a contrail. The falling snow in it makes a cool "ice bird" pattern inside the clear nucleated hole.
Member Since: 28.12.2006 Posts: 113 Comments: 1495
236. weatherboykris
31. tammikuuta 2007 klo 12:13 (GMT)
good morning
Member Since: 9.12.2006 Posts: 125 Comments: 11346
235. HurricaneMyles
31. tammikuuta 2007 klo 11:41 (GMT)
Pottery....We've never done well with ENSO forecasts. I dont think the state of climate change is really make those predictions any worse because they we're already bad to begin with.
Member Since: 12.01.2006 Posts: 5 Comments: 827
234. HadesGodWyvern (Mod)
31. tammikuuta 2007 klo 08:26 (GMT)
TCWC DARWIN: Northern Territory Australia

TROPICAL LOW
11.3S 135.6E - 25 knots 1001 hPa

Tropical Cyclone Advisory
==========================
Tropical Low is situated in the southern Arafura Sea about 80 km north of Elcho Island and 165 km northwest of Nhulunbuy.

The Tropical Low is reported moving east at 8 knots.

Tropical Cyclone Watch
=========================
A CYCLONE WATCH is now current from Elcho Island to Numbulwar, including Nhulunbuy and Groote Eylandt.
Member Since: 24.05.2006 Posts: 48 Comments: 43646
233. Brunski
31. tammikuuta 2007 klo 06:09 (GMT)
insomniac? you people from the future tire easy. It's only 10pm Tuesday in Cali. - of course, there's no weather here to type about... so, later!
Member Since: 21.12.2006 Posts: 1 Comments: 41
232. pottery
31. tammikuuta 2007 klo 05:28 (GMT)
In the morning then...........................
Member Since: 24.10.2005 Posts: 0 Comments: 23080
231. pottery
31. tammikuuta 2007 klo 05:19 (GMT)
Any insomniacs out there ?
Member Since: 24.10.2005 Posts: 0 Comments: 23080
230. pottery
31. tammikuuta 2007 klo 05:18 (GMT)
Nite Nite........
Member Since: 24.10.2005 Posts: 0 Comments: 23080
229. pottery
31. tammikuuta 2007 klo 05:17 (GMT)
Exactly ! But why didnt they develop as expected ? My point earlier is pertinent here. We are basing our forecasts on what USED to happen. The climate has changed, and will continue to do so. So we are attempting to predict the weather using outdated info. This will change as we understand what is happening NOW, but the info we are getting is not enough yet. Ice caps melting, ocean temps changing, hot dry air from Africa reaching Florida etc. Its all too new........
Member Since: 24.10.2005 Posts: 0 Comments: 23080
228. weatherboykris
31. tammikuuta 2007 klo 05:15 (GMT)
goodnight Pottery.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
227. weatherboykris
31. tammikuuta 2007 klo 05:10 (GMT)
Things just didn't develop the way they were supposed to I geuss...you?
Member Since: 9.12.2006 Posts: 125 Comments: 11346
226. pottery
31. tammikuuta 2007 klo 05:08 (GMT)
OK. So what do you think caused the change to normal so early in the year. Any ideas ?
Member Since: 24.10.2005 Posts: 0 Comments: 23080
225. weatherboykris
31. tammikuuta 2007 klo 05:07 (GMT)
Yeah,I've finally caught up.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
224. pottery
31. tammikuuta 2007 klo 05:03 (GMT)
Oh, and its Wed. where you are too, so everything is cool.
Member Since: 24.10.2005 Posts: 0 Comments: 23080
223. weatherboykris
31. tammikuuta 2007 klo 05:02 (GMT)
from December 9th...
Member Since: 9.12.2006 Posts: 125 Comments: 11346
222. pottery
31. tammikuuta 2007 klo 05:01 (GMT)
I think that it was to sustain until June, and dissipate by August. Is that right ?
Member Since: 24.10.2005 Posts: 0 Comments: 23080
221. pottery
31. tammikuuta 2007 klo 04:59 (GMT)
Can you recall what the original forecast was, back in Nov. ? I'm trying to remember, but the head is tired...
Member Since: 24.10.2005 Posts: 0 Comments: 23080
220. weatherboykris
31. tammikuuta 2007 klo 04:56 (GMT)
not really.But seriously,it looks just about over.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
219. pottery
31. tammikuuta 2007 klo 04:54 (GMT)
I hope I have not upset you ........
Member Since: 24.10.2005 Posts: 0 Comments: 23080
218. pottery
31. tammikuuta 2007 klo 04:53 (GMT)
But there is a 50 % chance I may be wrong !!
Member Since: 24.10.2005 Posts: 0 Comments: 23080
217. pottery
31. tammikuuta 2007 klo 04:51 (GMT)
El Nino has gone away. The predictions were out again. The forecasters are basing thier predictions on historical info that no longer applies. We are flying blind now, and noone can acurately predict the weather or climate with more than 50 % accuracy. Thats what I think.......
Member Since: 24.10.2005 Posts: 0 Comments: 23080
216. weatherboykris
31. tammikuuta 2007 klo 04:47 (GMT)
stop it.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
215. pottery
31. tammikuuta 2007 klo 04:46 (GMT)
I,m from the future. What do you wish to know about tomorow ?
Member Since: 24.10.2005 Posts: 0 Comments: 23080
214. pottery
31. tammikuuta 2007 klo 04:44 (GMT)
Are you a voice from the past ?????
Member Since: 24.10.2005 Posts: 0 Comments: 23080
213. weatherboykris
31. tammikuuta 2007 klo 04:44 (GMT)
knock it off.LOL.What do you think of the El Nino?
Member Since: 9.12.2006 Posts: 125 Comments: 11346
212. pottery
31. tammikuuta 2007 klo 04:44 (GMT)
Its strange hearing from you , as you are still yesterday..........
Member Since: 24.10.2005 Posts: 0 Comments: 23080
211. weatherboykris
31. tammikuuta 2007 klo 04:42 (GMT)
so how are you doing?
Member Since: 9.12.2006 Posts: 125 Comments: 11346
210. pottery
31. tammikuuta 2007 klo 04:41 (GMT)
Cant be Friday, cause yesterday was Tuesday. Today is certainly Wednesday. And we are all still here. Except for the ones that are not, of course.
Member Since: 24.10.2005 Posts: 0 Comments: 23080
209. weatherboykris
31. tammikuuta 2007 klo 04:41 (GMT)
11:38 PM here.
Member Since: 9.12.2006 Posts: 125 Comments: 11346
208. weatherboykris
31. tammikuuta 2007 klo 04:40 (GMT)
It's not Friday anywhere on earth
Member Since: 9.12.2006 Posts: 125 Comments: 11346
207. pottery
31. tammikuuta 2007 klo 04:37 (GMT)
Or maybe its Wednesday. What day is it anyway ?
Member Since: 24.10.2005 Posts: 0 Comments: 23080
206. pottery
31. tammikuuta 2007 klo 04:35 (GMT)
who's up at this hour. Its Friday where I am.
Member Since: 24.10.2005 Posts: 0 Comments: 23080
205. weatherboykris
31. tammikuuta 2007 klo 04:02 (GMT)
anyone on?
Member Since: 9.12.2006 Posts: 125 Comments: 11346
204. Inyo
31. tammikuuta 2007 klo 04:00 (GMT)
well the last La Nina brought more rain than the current El Nino, and rains this year only started when El Nino fizzled. So i say, bring on the La Nina (for the west coast anyway.. we don't need any more Gulf hurricanes)
Member Since: 3.09.2002 Posts: 42 Comments: 867
202. Tazmanian
31. tammikuuta 2007 klo 03:41 (GMT)
Agree cyclonebuster has long as you keep the Global Warming part out for a day or so ok?
Member Since: 21.05.2006 Posts: 5089 Comments: 114048
200. Tazmanian
31. tammikuuta 2007 klo 03:34 (GMT)
what are particulates
Member Since: 21.05.2006 Posts: 5089 Comments: 114048
197. Tazmanian
31. tammikuuta 2007 klo 03:31 (GMT)
i dont mine the talk about Global Warming but not evere day of the week this is nic to see some in new then this Global Warming evere day can we keep it that way may be for a day or so
Member Since: 21.05.2006 Posts: 5089 Comments: 114048
194. Tazmanian
31. tammikuuta 2007 klo 03:26 (GMT)
this is the 1st blog i have seen dr m has done that dos not have to do with Global Warming and i want to keep it that way for a day or sonic to see some in new up with out a talk of Global Warming but web it is back to Global Warming and Climate Change
Member Since: 21.05.2006 Posts: 5089 Comments: 114048

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About JeffMasters

Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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