Mile-wide tornado smashes Windsor, Colorado; plus, hurricane season commentary

By: Dr. Jeff Masters , 1:23 PM GMT on May 23, 2008

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A mile-wide tornado swept through Colorado between 11am and noon yesterday, ripping the roofs off buildings, tossing cars into the air, and killing at least one person in Weld County, northeast of Denver. Hail up to 2.75" in diameter accompanied the storm, which took an unusual north-northwesterly track , parallel to the Rocky Mountains north of Denver. Hardest hit was the town of Windsor, between Fort Collins and Greely, where damage appeared to be at least EF3. A local TV station took some impressive live video of the tornado, and a wunderground web cam video in Windsor, Colorado (Figure 1) caught the funnel as it passed east of the camera.


Figure 1.Webcam view looking east at 11:45am MDT in Windsor, Colorado as the tornado passed by. Note the golf ball-sized hail covering the ground. Image credit: windsorweather.com.

The Weather Underground's tornado expert, Rob Carver, had this explanation of yesterday's tornadoes:

Two low pressure systems over the Western U.S. were the cause of the severe weather outbreak of May 22. A strong upper-level low over the Great Basin formed a surface low in the lee of the Rockies, and brought a strong southerly mid-level jet over the Plains of Colorado and Kansas. As the surface low formed, it brought warm moist air northwards, forming a warm front. This warm air moved westward, rising with the terrain, causing thunderstorms to form. Once these storms formed, the juxtaposition of easterly flow at the surface with southerly flow aloft (i.e., wind shear) produced significant spin in the horizontal direction, which was tilted by the storms to vertical spin, which triggered the formation of tornadic thunderstorms. This movement of the warm front up the slope of the Rockies to help trigger tornadic thunderstorms is a rare occurrence.



Figure 2. Radar reflectivity image (top) of the Windsor, Colorado tornado at 11:45am MDT May 22, 2008. Note the classic hook-shaped echo associated with the tornado. Bottom: Doppler velocity image of the tornado, showing a small core of red and blue colors right next to each other, denoting strong winds towards and away from the radar, the classic signature of a tornado vortex. For those interested, we've saved an animation of the reflectivity and Doppler velocity.

Severe weather forecast
Severe weather is expected today over Kansas, Nebraska, and surrounding states. NOAA's Storm Prediction Center has placed portions of this area under its "Moderate Risk" category for severe weather, one step below its highest level of concern, "High Risk". Yesterday was also a "Moderate Risk" day, which SPC later upgraded to "High Risk" once the tornadoes started pounding Colorado. More severe weather is expected Saturday and Sunday over the Midwest as the upper-level low pressure system responsible moves slowly eastward. The Weather Underground Severe Weather page and Tornado page and WebCam page are good places to go to follow the severe weather. Also, tune in to the chase accounts and awesome storm photos from Wunderblogger Mike Theiss, who was in Kansas yesterday, and has posted many spectacular photos of yesterday's storms. According to Mike's blog:

Today Cloud 9 Tours saw 4 tornadoes and ONE developing almost overhead. We experienced winds over 100mph from the circulation of the meso that passed overhead as a cone tornado developed. Stay Tuned....


Possible development in the Eastern Pacific late next week
The past four days, the ECMWF model has been predicting the formation of a tropical storm in the the Eastern Pacific, just off the coast of Guatemala, around May 29. The GFS model has also been predicting something might develop, but in the Western Caribbean near Mexico's Yucatan Peninsula. The GFS has been rather inconsistent with its handling of this potential storm, and I am inclined to discount its forecast--especially since last night's long range runs of the NOGAPS, Canadian, and UKMET models all show development in the Eastern Pacific, not the Caribbean. All five models predict a northward shift in the jet stream and substantial relaxation in wind shear over the Eastern Pacific and Western Caribbean next week. It is common to see May tropical storms in the Eastern Pacific, and it would not be a surprise to see something develop there. I'd put the odds of something popping up in the Western Caribbean or Gulf of Mexico at less than 10%, though.

NOAA's seasonal hurricane forecast
NOAA issued its annual seasonal hurricane forecast yesterday, which I discussed in detail in yesterday's blog entry. Yesterday's forecast came out with a little more uncertainty attached to it than previous forecasts, which is a good thing. The media attention and fanfare that accompanies these forecasts is rather excessive, given the low skill they have. In fact, we don't even know if the NOAA forecasts have ANY mathematical skill, because they've never released a verification study of their forecasts. I doubt that the skill is very high--as Eric Berger of the Houston Chronicle pointed out in a blog yesterday, NOAA has blown its forecast of Accumulated Cyclone Energy (ACE) each of the last six years. NOAA held its usual press conference to announce the forecast; this year, it was held at the home of the NOAA Hurricane Hunter aircraft, MacDill AFB in Tampa. The NOAA dignitaries present said all the right things, preaching the need for preparedness regardless of the forecast for the upcoming hurricane season. Still, I wonder if NOAA might be hurting themselves by making such a public spectacle over the release of a forecast that no one knows the accuracy of, and has performed poorly by some measures in recent years. I do like the fact they are issuing public hurricane forecasts, as I expect their accuracy and value will improve in coming years, but they're definitely not worth the attention they're getting at present.

Jeff Masters

Tornado1 (kd7tda)
One of several tornados. This one was near Grainfield, KS
Tornado1
Tornado Damage 3 (jlg)
Damage from today's Tornado in Windsor, Colorado
Tornado Damage 3
()
Mean Looking Meso with Cone Tornado (MikeTheiss)
Photo os a wallcloud with a developing tornado passing just to the north of our location on May 22nd, 2008. Photo copyright Mike Theiss
Mean Looking Meso with Cone Tornado

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257. IpswichWeatherCenter
7:40 PM GMT on May 23, 2008
250. HurricaneSammy 7:39 PM GMT on May 23, 2008
248. HurricaneGeek 7:37 PM GMT on May 23, 2008
On the Northwest part of Lake Okechobbee, there is a very strong cell! YAY!

HG don't You Agree they need to Put a Severe Watch Out?


EVEN I DO!

And to be honest I think the Nws need to move there brains out of sleepy mode and into holy monkeys Florida's about to die.
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256. Drakoen
7:41 PM GMT on May 23, 2008
Look at the echo tops on this storm cell moving in my general direction.

Photobucket
Member Since: October 28, 2006 Posts: 57 Comments: 30565
255. Ivansrvivr
7:38 PM GMT on May 23, 2008
Plenty of photos of todays storm clouds on my blog. We need a good rainy season this year. Yesterday and today are a good start.
Member Since: Posts: Comments:
254. HurricaneSammy
7:39 PM GMT on May 23, 2008
My Little Sister Still Wants To go to the Park...

Oh-Boy How will i Explain This Too Her"
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253. IpswichWeatherCenter
7:38 PM GMT on May 23, 2008
IWC Unoffical warning... (the site also known as Ipswich weather center does warnings over in the USA)

Thunderstorm warnings from Belle Glade Due south to current NWS Severe thunderstorm warning.
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252. hahaguy
3:39 PM EDT on May 23, 2008
they have sammy it was on my tv
Member Since: August 12, 2007 Posts: 2 Comments: 2838
251. Patrap
2:39 PM CDT on May 23, 2008
ESL GOES-12 Imagery ,Atlantic WV Link
Member Since: July 3, 2005 Posts: 426 Comments: 128764
250. HurricaneSammy
7:38 PM GMT on May 23, 2008
248. HurricaneGeek 7:37 PM GMT on May 23, 2008
On the Northwest part of Lake Okechobbee, there is a very strong cell! YAY!


HG don't You Agree they need to Put a Severe Watch Out?

Member Since: Posts: Comments:
249. HurricaneSammy
7:37 PM GMT on May 23, 2008
241. MasterForecaster 7:34 PM GMT on May 23, 2008
234. HurricaneSammy 7:29 PM GMT on May 23, 2008
OMG it is Raining Heavy Now and the NWS Is Saying there is only a 30 Percent Chance Of Rain Today

So Whats up with them , The Radar is Full Of Pretty Colors

Haha when they say a 30% chance of rain they mean 30% chance YOUR AREA gets rain...but yea it's usually wrong anyways...and yes the radar is full of pretty colors, are you high? (lol)


Nope , Just The Nws Must Be Doing Something

At Least Issue a Severe Thunderstorm Watch
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248. HurricaneGeek
3:36 PM EDT on May 23, 2008
On the Northwest part of Lake Okechobbee, there is a very strong cell! YAY!
Member Since: Posts: Comments:
247. IpswichWeatherCenter
7:36 PM GMT on May 23, 2008
242. HurricaneSammy 7:35 PM GMT on May 23, 2008 Hide this comment.
238. IpswichWeatherCenter 7:32 PM GMT on May 23, 2008
It looks like the rain over florida might stall...


No Its Good Luck we Need the Rain Just not severe

-----------------------------------------------
239. KrazyKaneLove 7:32 PM GMT on May 23, 2008
Thanks Sammy, I'm out by Lion Country Safari and it is getting very dark, thunder rolling, rain should be here in about 10 minutes:) yeah!

Be Carefull =) Stay Safe


I wonder what the Animals At Lion Country Safari Do When a Sevre Storm or any storm hits without Notice ?

Huddle ? Hide? Run?


*laughs at huddle remark*

Its bad.... Just coz you need the rain doesn't mean that this will provide too much and flood like what happened to the Uk in 2003 or 4 I think.
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246. HurricaneSammy
7:35 PM GMT on May 23, 2008
240. HurricaneGeek 7:34 PM GMT on May 23, 2008
I can see that to my South and to my West the clouds are very dark, well, very gray, getting darker. I'm about 3 miles south of West Palm.


Geek Lives Just North Of Me (Boynton Beach)
And My City (Boca Raton)

Are Going to Get Impaled By The Squall Line Lol
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245. KrazyKaneLove
7:32 PM GMT on May 23, 2008
Ipswich, I'm just trying to read your posts and then switch over to radar..and then look out my window..lol
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244. hurricane23
3:35 PM EDT on May 23, 2008
My Radar page for all of South Florida.
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243. IpswichWeatherCenter
7:35 PM GMT on May 23, 2008
What is fueling this?

Should start to weaken in a bit.
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242. HurricaneSammy
7:33 PM GMT on May 23, 2008
238. IpswichWeatherCenter 7:32 PM GMT on May 23, 2008
It looks like the rain over florida might stall...


No Its Good Luck we Need the Rain Just not severe

-----------------------------------------------
239. KrazyKaneLove 7:32 PM GMT on May 23, 2008
Thanks Sammy, I'm out by Lion Country Safari and it is getting very dark, thunder rolling, rain should be here in about 10 minutes:) yeah!


Be Carefull =) Stay Safe


I wonder what the Animals At Lion Country Safari Do When a Sevre Storm or any storm hits without Notice ?

Hudle ? Hide? Run?
Member Since: Posts: Comments:
241. MasterForecaster
7:30 PM GMT on May 23, 2008
234. HurricaneSammy 7:29 PM GMT on May 23, 2008
OMG it is Raining Heavy Now and the NWS Is Saying there is only a 30 Percent Chance Of Rain Today

So Whats up with them , The Radar is Full Of Pretty Colors


Haha when they say a 30% chance of rain they mean 30% chance YOUR AREA gets rain...but yea it's usually wrong anyways...and yes the radar is full of pretty colors, are you high? (lol)
Member Since: Posts: Comments:
240. HurricaneGeek
3:28 PM EDT on May 23, 2008
I can see that to my South and to my West the clouds are very dark, well, very gray, getting darker. I'm about 3 miles south of West Palm.

There was a request for a doppler I think:


If you need me to trim the size down... please tell me :)
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239. KrazyKaneLove
7:29 PM GMT on May 23, 2008
Thanks Sammy, I'm out by Lion Country Safari and it is getting very dark, thunder rolling, rain should be here in about 10 minutes:) yeah!
Member Since: Posts: Comments:
238. IpswichWeatherCenter
7:31 PM GMT on May 23, 2008
It looks like the rain over florida might stall...

BAD LUCK
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237. MasterForecaster
7:29 PM GMT on May 23, 2008
thanks a lot hurricanesammy!

finally some rain...I don't care if it's severe bring it on.
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236. Drakoen
7:27 PM GMT on May 23, 2008
After looking at the 12z runs I suspect that the EPAC system will be the one to develop instead of the Caribbean system. There is enough model consensus from all the models to support this. What I don't understand is how the models show increased wind shear over the time period with the CMC being the most dramatic with the shear in both the EPAC and the Caribbean with shear levels 30 knots+. Whether or not develop occurs and where it occurs will like being the area under and upper level anticyclone.
Member Since: October 28, 2006 Posts: 57 Comments: 30565
235. IpswichWeatherCenter
7:28 PM GMT on May 23, 2008
SEVERE THUNDERSTORM WARNING
FLC086-232000-
/O.NEW.KMFL.SV.W.0028.080523T1855Z-080523T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
255 PM EDT FRI MAY 23 2008

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
WEST CENTRAL MIAMI-DADE COUNTY IN SOUTH FLORIDA.

* UNTIL 400 PM EDT

* AT 253 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
FORTYMILE BEND...AND MOVING EAST AT 6 MPH.

* THE STORM WILL AFFECT...
FORTYMILE BEND...
AND SURROUNDING COMMUNITIES.

FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES AND
AVOID WATER. MOVE INDOORS OR INSIDE A VEHICLE IF POSSIBLE. AVOID
USING THE TELEPHONE UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG
UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

LAT...LON 2586 8063 2559 8068 2573 8087 2585 8088
TIME...MOT...LOC 1855Z 278DEG 5KT 2578 8087

$$

BAXTER/RIVERA

__________________________________

000
FLUS42 KMFL 231430 AAA
HWOMFL

HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA...UPDATED
NATIONAL WEATHER SERVICE MIAMI FL
1030 AM EDT FRI MAY 23 2008

FLZ063-066>075-168-172>174-240215-
GLADES-HENDRY-INLAND PALM BEACH-METRO PALM BEACH-COASTAL COLLIER-
INLAND COLLIER-INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-
METRO MIAMI DADE-MAINLAND MONROE-COASTAL PALM BEACH-
COASTAL BROWARD-COASTAL MIAMI DADE-FAR SOUTH MIAMI DADE-
1030 AM EDT FRI MAY 23 2008

...A FEW STRONG STORMS MAINLY OVER THE CENTRAL AND NORTHERN AREAS TODAY...
...A FEW STRONG STORMS MAINLY EAST COAST AREAS SATURDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS: THERE IS A CHANCE OF THUNDERSTORMS ACROSS MOST OF
SOUTH FLORIDA TODAY WITH THE HIGHEST PROBABILITY OVER THE NORTHERN
AREAS. THE PRIMARY AFFECTS FROM THE STORMS WILL BE LIGHTING
STRIKES...GUSTY WINDS UP TO 50 MPH, SMALL HAIL, AND LOCALLY HEAVY
RAINFALL. IF YOU HEAR THUNDER OR SEE LIGHTNING MOVE INSIDE UNTIL
THE STORMS HAVE PASSED BY.

WIND: THE STRONGEST THUNDERSTORMS TODAY WILL BE CAPABLE OF
PRODUCING WIND GUSTS UP TO 50 MPH ESPECIALLY WHERE THE SEA BREEZES
AND LAKE BREEZE COLLIDE.

HAIL: THE MID LEVELS OF THE ATMOSPHERE REMAINS COOL WITH WILL
ALLOW FOR SOME SMALL HAIL WITH THE STRONGEST STORMS TODAY
ESPECIALLY WERE THE SEA BREEZES AND LAKE BREEZE COLLIDE.

FLOODING: THE LOW LEVEL RIDGE OF HIGH PRESSURE WILL BE OVER SOUTH
FLORIDA TODAY WHICH IN TURN WILL CAUSE THE THUNDERSTORMS TO MOVE
SLOWLY NORTH. THEREFORE...ANY THUNDERSTORM THAT DOES DEVELOP WILL
BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL LEADING TO SOME
MINOR URBAN AND POORLY DRAINAGE FLOODING.



.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS ARE EXPECTED TO DEVELOP AGAIN ON SATURDAY. THE STORMS ARE
FORECAST TO BECOME CONCENTRATED FROM THE LAKE OKEECHOBEE REGION TO
ALONG THE EAST COAST, WHERE SCATTERED TO NUMEROUS STORMS ARE EXPECTED,
A FEW OF WHICH COULD BECOME STRONG.

A LATE SEASON COLD FRONT WILL MOVE ACROSS THE AREA ON SUNDAY, BRINGING
MUCH COOLER AND LESS HUMID CONDITIONS TO MAINLAND SOUTH FLORIDA.
NORTH WINDS BEHIND THE FRONT WILL LEAD TO BUILDING GULF STREAM SEAS OF
UP TO 7 FEET BY SUNDAY AFTERNOON.

NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.



.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGE TO REPORT WIND GUSTS ABOVE 40 MPH, ANY HAIL
SIZE, AND ANY FLOODING TO THE NATIONAL WEATHER SERVICE IN MIAMI FLORIDA.

FOR MORE INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN
MIAMI WEBSITE AT WWW.WEATHER.GOV/MIAMI.
$$

BAXTER

_______________________________

Noticed the lack of updates?
Member Since: Posts: Comments:
234. HurricaneSammy
7:28 PM GMT on May 23, 2008
OMG it is Raining Heavy Now and the NWS Is Saying there is only a 30 Percent Chance Of Rain Today

So Whats up with them , The Radar is Full Of Pretty Colors
Member Since: Posts: Comments:
233. HurricaneSammy
7:26 PM GMT on May 23, 2008
230. MasterForecaster 7:25 PM GMT on May 23, 2008
I think severe thunderstorm watches/warning have been issued for parts of south florida...does anyone know where these storms are headed? or if anyone has a link to a good dopplar image that'd be cool.

thanks and stay safe!



Florida C and S

http://www.palmbeachpost.com/weather/content/weather/special/regional_radar.html

Keys And Miami Dade

http://www.palmbeachpost.com/weather/content/weather/special/south_regional_radar.html

Regional Radar for FLA
http://www.palmbeachpost.com/weather/content/shared/weather/regions/SE_doppler.html

High Detail of The West Palm Beach Cell

http://www.cbs12.com/sections/weather/doppler/post.shtml
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232. IpswichWeatherCenter
7:25 PM GMT on May 23, 2008
228. hurricane23 7:25 PM GMT on May 23, 2008 Hide this comment.
215. IpswichWeatherCenter 3:16 PM EDT on May 23, 2008
Im a bit shocked that the NHC ain't given us 90L or 90E yet.

There is nothing out in the atlantic that would classify as an invest at the present time.Also for future reference the NHC does not issue invest.


ok... sorry...

229. HurricaneSammy 7:25 PM GMT on May 23, 2008
On The Map (Boca Raton) Is Where i Live Notice The Line Approcahcing

The Nws should put up a Severe Weather Watch



The nws are haveing slight update probs it seems.
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231. hahaguy
3:25 PM EDT on May 23, 2008
glad to see rain here but us in st lucie need it to lol
Member Since: August 12, 2007 Posts: 2 Comments: 2838
230. MasterForecaster
7:14 PM GMT on May 23, 2008
I think severe thunderstorm watches/warning have been issued for parts of south florida...does anyone know where these storms are headed? or if anyone has a link to a good dopplar image that'd be cool.

thanks and stay safe!
Member Since: Posts: Comments:
229. HurricaneSammy
7:24 PM GMT on May 23, 2008
On The Map (Boca Raton) Is Where i Live Notice The Line Approcahcing

The Nws should put up a Severe Weather Watch
Member Since: Posts: Comments:
228. hurricane23
3:22 PM EDT on May 23, 2008
215. IpswichWeatherCenter 3:16 PM EDT on May 23, 2008
Im a bit shocked that the NHC ain't given us 90L or 90E yet.

There is nothing out in the atlantic that would classify as an invest at the present time.Also for future reference the NHC does not issue invest.
Member Since: Posts: Comments:
227. HurricaneSammy
7:22 PM GMT on May 23, 2008
Close Up Of WPB Cell

http://www.palmbeachpost.com/weather/content/weather/special/local_radar.html
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226. Drakoen
7:22 PM GMT on May 23, 2008
Good afternoon everyone.
Member Since: October 28, 2006 Posts: 57 Comments: 30565
225. IpswichWeatherCenter
7:22 PM GMT on May 23, 2008
hope no one gets hurt... the tornado areas i was showing are flaring up.
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224. TerraNova
3:18 PM EDT on May 23, 2008
I Live Just South Of West Palm Beach and Hurricane Geek Does too ...

West Palm Beach should be getting a pretty good soaking soon. Rain rates of about 2 inches per hour are approaching from the west. Hopefully these storms can hold.
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223. HurricaneSammy
7:20 PM GMT on May 23, 2008
Clouds Getting Dark In That Direction and i live in Boca Raton , in the Same county but Southern Part Of it
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222. IpswichWeatherCenter
7:19 PM GMT on May 23, 2008
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221. KrazyKaneLove
7:16 PM GMT on May 23, 2008
I'm actually west of wpb so I'll let you know what this storm is doing...The mets never say anything local til west palm is already getting whacked I noticed..lol
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220. IpswichWeatherCenter
7:16 PM GMT on May 23, 2008


Area of supercells.
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219. HurricaneSammy
7:18 PM GMT on May 23, 2008
Let me Look Out My Window to the North - West North
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218. HurricaneSammy
7:16 PM GMT on May 23, 2008
213. TerraNova 7:14 PM GMT on May 23, 2008
Wow. That storm west of West Palm Beach has tops approaching 60,000 feet (most storms stay near 50,000). Lots of energy avaliable in the atmosphere.


I Live Just South Of West Palm Beach and Hurricane Geek Does too ...
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216. KrazyKaneLove
7:14 PM GMT on May 23, 2008
looks like West Palm is going to get it next..yesterday was nice but grass already looks thirsty again...one more good drenching would certainly help..
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215. IpswichWeatherCenter
7:13 PM GMT on May 23, 2008
Im a bit shocked that the NHC ain't given us 90L or 90E yet.
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213. TerraNova
3:13 PM EDT on May 23, 2008
Wow. That storm west of West Palm Beach has tops approaching 60,000 feet (most storms stay near 50,000). Lots of energy avaliable in the atmosphere.
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212. Bayoucanetracker
1:55 PM CDT on May 23, 2008
thanks atmo...here's my first question as an underground blogger...will the shelf provide a buffer to intensity if a storm was to make landfall mid-point of Louisiana..ie the Vermillion Basin??? There's different opinions on the so-called "shelf buffer"???
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211. bystander
7:04 PM GMT on May 23, 2008
Good eye Cane. I have never been happier to see the letter 'S'. My grass will be happy too!
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209. TheCaneWhisperer
7:03 PM GMT on May 23, 2008
"GIVE ME AN S"
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208. NEwxguy
7:03 PM GMT on May 23, 2008
Statement as of 12:40 PM MDT on May 23, 2008


The NWS Storm Prediction Center has issued a
Tornado Watch for portions of

parts of northeast Colorado
much of Nebraska Panhandle
parts of eastern Wyoming

Effective this Friday afternoon and evening from 1240 PM until
700 PM MDT.

Tornadoes... hail to 3 inches in diameter... thunderstorm wind
gusts to 70 mph... and dangerous lightning are possible in these
areas.

The Tornado Watch area is approximately along and 85 statute
miles east and west of a line from 45 miles north northeast of
Douglas Wyoming to 25 miles west southwest of Akron Colorado.
For a complete depiction of the watch see the associated watch
outline update (wous64 kwns wou0).

Remember... a Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

Discussion... very strong veering shear profiles E of higher terrain
in sern WY/nern co with increasingly moist sely flow. With little
remaining cinh... thunderstorms expected to increase rapidly in
number/intensity. Supercells will develop with associated very
large hail and possible tornadoes as they move quickly N across
watch area.

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207. hahaguy
3:02 PM EDT on May 23, 2008
ah i see the sst's are heating up nicely
Member Since: August 12, 2007 Posts: 2 Comments: 2838

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