Severe Thunderstorm Watch 583

Issued

Aug 16, 2012, 3:27 PM CDT (20:27 UTC)

Expired

Aug 16, 2012, 11:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1773Aug 16, 12:47 PM CDT
• Mesoscale Discussion 1775Aug 16, 3:07 PM CDT
• Mesoscale Discussion 1777Aug 16, 5:25 PM CDT
• Mesoscale Discussion 1780Aug 16, 9:26 PM CDT

609 
WWUS20 KWNS 162030
SEL3  
SPC WW 162030
ILZ000-INZ000-KYZ000-MOZ000-170400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 583
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT THU AUG 16 2012

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

       SOUTHERN ILLINOIS
       SOUTHERN INDIANA
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1100 PM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH
NORTHEAST OF BLOOMINGTON INDIANA TO 40 MILES SOUTH OF PADUCAH
KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 582...

DISCUSSION...STORMS ARE CONSOLIDATING ALONG A COLD FRONT MOVING SEWD
FROM IL/WRN IND SWWD TO MO THIS AFTERNOON. A VERY WARM AND MOIST
AIRMASS AHEAD OF THE FRONT WILL RESULT IN SUFFICIENT INSTABILITY TO
SUSTAIN STRONG TO SEVERE STORMS AS THE FRONT SETTLES SEWD TOWARD THE
LOWER OH VALLEY AND CONFLUENCE OF THE OH/MS RIVERS THROUGH THIS
EVENING. DEEP-LAYER WLY FLOW IS FORECAST TO STRENGTHEN COINCIDENT
WITH THE FRONTAL ADVANCE AND SHOULD SUPPORT AND INCREASE IN STORM
MOTION AND ORGANIZATION...ESPECIALLY ACROSS ERN IL AND SRN IND.
SLIGHTLY WEAKER MID LEVEL FLOW WITH SWD/SWWD EXTENT WILL LIKELY BE
COMPENSATED FOR BY GREATER DESTABILIZATION IN THESE AREAS TO SUPPORT
VIGOROUS STORMS WITH SOME HAIL AND SEVERE WIND POTENTIAL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 31030.


...CARBIN

Severe Thunderstorm Watches in Kentucky, 2012Severe Thunderstorm Watches in Indiana, 2012Severe Thunderstorm Watches in Illinois, 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.