Severe Thunderstorm Watch 710

Issued

Aug 18, 2009, 4:00 PM MDT (22:00 UTC)

Expired

Aug 18, 2009, 11:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 135 km from the middle of the area, began a volume at 22:03 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

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1912Aug 18, 3:46 PM MDT
• Mesoscale Discussion 1913Aug 18, 7:41 PM MDT

363 
WWUS20 KWNS 182159
SEL0  
SPC WW 182159
COZ000-KSZ000-NEZ000-OKZ000-TXZ000-190500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 710
NWS STORM PREDICTION CENTER NORMAN OK
500 PM CDT TUE AUG 18 2009

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

       EASTERN COLORADO
       WESTERN KANSAS
       SOUTHWEST NEBRASKA
       OKLAHOMA PANHANDLE
       TEXAS PANHANDLE

EFFECTIVE THIS TUESDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT CDT.

HAIL TO 2.5 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
NORTHWEST OF MCCOOK NEBRASKA TO 35 MILES SOUTH SOUTHWEST OF
AMARILLO TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 709...

DISCUSSION...SEVERAL CLUSTERS OF INTENSE THUNDERSTORMS OVER EASTERN
CO AND NORTHEAST NM WILL TRACK EASTWARD THIS AFTERNOON AND EVENING
INTO THE WATCH AREA.  A COMBINATION OF MODERATE
INSTABILITY...SUFFICIENT VERTICAL SHEAR...AND LARGE SCALE FORCING
ASSOCIATED WITH AN APPROACHING TROUGH WILL MAINTAIN A RISK OF LARGE
HAIL AND DAMAGING WINDS THROUGH MOST OF THE EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.


...HART

Severe Thunderstorm Watches in Kansas, 2009Severe Thunderstorm Watches in Texas, 2009Severe Thunderstorm Watches in Colorado, 2009Every severe thunderstorm watch in 2009

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.