Memorial Day Weekend Outbreak 2008

[RL3AO]

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 335
NWS STORM PREDICTION CENTER NORMAN OK
150 PM CDT THU MAY 22 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

WESTERN KANSAS KANSAS
EXTREME SOUTHWESTERN NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL
1000 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF
MCCOOK NEBRASKA TO 55 MILES SOUTH SOUTHEAST OF DODGE CITY KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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.

[CrazyC83]

Yep PDS as it should be:

SEL5

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 335
NWS STORM PREDICTION CENTER NORMAN OK
150 PM CDT THU MAY 22 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

WESTERN KANSAS KANSAS
EXTREME SOUTHWESTERN NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL
1000 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF
MCCOOK NEBRASKA TO 55 MILES SOUTH SOUTHEAST OF DODGE CITY KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 334...

DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ALONG AND EAST OF THE
DRYLINE SHORTLY...AS LARGE SCALE ASCENT INCREASES AHEAD OF SHORTWAVE
TROUGH MOVING INTO SERN CO. MODERATE TO STRONG INSTABILITY AND
EFFECTIVE SHEAR AT 55-65 KT WILL LIKELY RESULT IN INTENSE SUPERCELLS
THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. INSTABILITY AND
STRONG SHEAR WILL BE FAVORABLE FOR STORMS WITH HAIL UP TO 3 INCHES
IN DIAMETER. ALSO...EXTREMELY STRONG LOW LEVEL SHEAR...ESPECIALLY
NEAR THE WARM FRONT...THAT STRETCHED FROM GLD TO HLC AT 18Z...SHOULD
SUPPORT TORNADOES...SOME VERY DAMAGING AND LARGE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 20035.


...IMY

[KWT]

Another tornado being issued for Washinton county from what I've just heard...

Also for the other cell still got huge hail present.

Not surprising about the PDS to be honest...

[wbug1]

I now see 2 TVS in the cell halfway between a line roughly from Fort Collins, CO to Laramie, CO.

[Bunkertor]

What´s the exact reason this is a pds ?

[KWT]

Yep same here wbug1 going to have to be watched.

* AT 101 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES
NORTHWEST OF AKRON. THIS STORM WAS MOVING NORTHWEST AT 52 MPH.

[RL3AO]

What´s the exact reason this is a pds ?

DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ALONG AND EAST OF THE
DRYLINE SHORTLY...AS LARGE SCALE ASCENT INCREASES AHEAD OF SHORTWAVE
TROUGH MOVING INTO SERN CO. MODERATE TO STRONG INSTABILITY AND
EFFECTIVE SHEAR AT 55-65 KT WILL LIKELY RESULT IN INTENSE SUPERCELLS
THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. INSTABILITY AND
STRONG SHEAR WILL BE FAVORABLE FOR STORMS WITH HAIL UP TO 3 INCHES
IN DIAMETER. ALSO...EXTREMELY STRONG LOW LEVEL SHEAR...ESPECIALLY
NEAR THE WARM FRONT...THAT STRETCHED FROM GLD TO HLC AT 18Z...SHOULD
SUPPORT TORNADOES...SOME VERY DAMAGING AND LARGE.

[KWT]

As RL3AO has just shown its a very unstable set-up we have presently however its also the case that we have just had what seems to have been a sizeable tornado develop.

[CrazyC83]

What´s the exact reason this is a pds ?

DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ALONG AND EAST OF THE
DRYLINE SHORTLY...AS LARGE SCALE ASCENT INCREASES AHEAD OF SHORTWAVE
TROUGH MOVING INTO SERN CO. MODERATE TO STRONG INSTABILITY AND
EFFECTIVE SHEAR AT 55-65 KT WILL LIKELY RESULT IN INTENSE SUPERCELLS
THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. INSTABILITY AND
STRONG SHEAR WILL BE FAVORABLE FOR STORMS WITH HAIL UP TO 3 INCHES
IN DIAMETER. ALSO...EXTREMELY STRONG LOW LEVEL SHEAR...ESPECIALLY
NEAR THE WARM FRONT...THAT STRETCHED FROM GLD TO HLC AT 18Z...SHOULD
SUPPORT TORNADOES...SOME VERY DAMAGING AND LARGE.

It's a no-brainer. A high risk at 2000Z is very possible.

[RL3AO]

http://www.9news.com/9slideshows/Weld%20County%20Tornado%205-22-08/

Slide show of tornado and other stuff.

[KWT]

Yep I thought they could have done it on thier last update but its a real possiblity given how things have evolved so far today.

[wbug1]

Tornado warning 15 km east of Ft. Morgan, CO. Sorry already mentioned.

[Bunkertor]

What´s the exact reason this is a pds ?

DISCUSSION...STORMS ARE EXPECTED TO DEVELOP ALONG AND EAST OF THE
DRYLINE SHORTLY...AS LARGE SCALE ASCENT INCREASES AHEAD OF SHORTWAVE
TROUGH MOVING INTO SERN CO. MODERATE TO STRONG INSTABILITY AND
EFFECTIVE SHEAR AT 55-65 KT WILL LIKELY RESULT IN INTENSE SUPERCELLS
THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. INSTABILITY AND
STRONG SHEAR WILL BE FAVORABLE FOR STORMS WITH HAIL UP TO 3 INCHES
IN DIAMETER. ALSO...EXTREMELY STRONG LOW LEVEL SHEAR...ESPECIALLY
NEAR THE WARM FRONT...THAT STRETCHED FROM GLD TO HLC AT 18Z...SHOULD
SUPPORT TORNADOES...SOME VERY DAMAGING AND LARGE.

OK LLS is massive but normally thats not enough...and it´s early in the day.

[KWT]

got to remember as well there is some very high cape levels and with such values we've got with regards to the LLS would be ssuggestive of a strong likelyhood of a tornadic outbreak...that plus as I've alrady said we've already had 2 tornadoes hit from this bunch of cells.

[Bunkertor]

I just saw a CO-cell shooting up very rapidly - must have been the one that caused the damage.

==============

I´ve got no clue if pds is warranted. There are no current soundings available.

[Sanibel]

Houses severely damaged north of Denver by wide tornado.

[Texas Snowman]

The Weather Channel is showing major damage to a number of homes in Weld County.

Don't see anything that looks EF5 damage however.

Tx Snowman

[RL3AO]

Chad Meyers used GRLevel2 Analyst live on the air for looking at velocities.

[windnrain]

Laramie is getting hit now
Tornado warning.

[KWT]

No thankfully despite the large size of the tornado doesn't sound like extreme damage that you'd see with a very top end tornado.