Severe Thunderstorm Watch 655

Issued

Sep 27, 2012, 4:59 PM MDT (22:59 UTC)

Expired

Sep 28, 2012, 12:00 AM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Pueblo radar (KPUX), 161 km from the middle of the area, began a volume at 23:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 1999Sep 27, 2:09 PM MDT
• Mesoscale Discussion 2002Sep 27, 8:18 PM MDT

913 
WWUS20 KWNS 272303
SEL5
SPC WW 272303
COZ000-KSZ000-NMZ000-OKZ000-TXZ000-280600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 655
NWS STORM PREDICTION CENTER NORMAN OK
500 PM MDT THU SEP 27 2012

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

       SOUTHEAST COLORADO
       SOUTHWEST KANSAS
       NORTHEAST NEW MEXICO
       WESTERN OKLAHOMA PANHANDLE
       NORTHERN TEXAS PANHANDLE

EFFECTIVE THIS THURSDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT MDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH
SOUTHWEST OF LA JUNTA COLORADO TO 45 MILES NORTH NORTHEAST OF
GUYMON OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 654...

DISCUSSION...AN UPPER LEVEL DISTURBANCE ACROSS CO WILL CONTINUE TO
PROVIDE ASCENT AND A FAVORABLE ENVIRONMENT FOR STRONG TO SEVERE
TSTMS ACROSS THE SERN CO AND ADJACENT NERN NM THIS EVENING. MOIST
LOW LEVEL ELY/UPSLOPE FLOW WAS ALSO AIDING STORM DEVELOPMENT ACROSS
THE HIGHER TERRAIN AND MOST GUIDANCE SUGGESTS THAT ONE OR TWO SMALL
TSTM CLUSTERS WILL GROW UPSCALE AND DEVELOP SEWD ACROSS SERN CO AND
INTO PARTS OF SWRN KS AS WELL AS PORTIONS OF THE TX/OK PNHDLS
THROUGH LATE EVENING AND OVERNIGHT. IN ADDITION TO SOME INCREASE IN
STRONG/DAMAGING WIND THREAT WITH THIS ACTIVITY...A BELT OF STRONGER
MID LEVEL FLOW ON THE ORDER OF 30-40KT ACROSS THE CO/NM BORDER AREA
WILL PROVIDE SUFFICIENT SHEAR FOR UPDRAFT PERSISTENCE AND A CHANCE
FOR LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 28030.


...CARBIN

Severe Thunderstorm Watches in Colorado, 2012Severe Thunderstorm Watches in Kansas, 2012Severe Thunderstorm Watches in Texas, 2012Every severe thunderstorm watch in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.