Severe Thunderstorm Watch 430

Issued

Jun 20, 2007, 4:22 PM CDT (21:22 UTC)

Expired

Jun 21, 2007, 12:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Minneapolis radar (KMPX), 34 km from the middle of the area, began a volume at 21:23 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

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1215Jun 20, 1:52 PM CDT
• Mesoscale Discussion 1219Jun 20, 4:00 PM CDT
• Mesoscale Discussion 1224Jun 20, 8:28 PM CDT
• Mesoscale Discussion 1226Jun 20, 11:30 PM CDT

000
WWUS20 KWNS 202123
SEL0  
SPC WW 202123
MNZ000-210500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
425 PM CDT WED JUN 20 2007

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

       MUCH OF CENTRAL AND SOUTHERN MINNESOTA

EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 425 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES EAST OF
MINNEAPOLIS MINNESOTA TO 30 MILES SOUTH OF ORTONVILLE MINNESOTA. 
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 428...WW 429...

DISCUSSION...E/W FRONTAL ZONE ACROSS CENTRAL MN WILL BE FOCUS FOR
SEVERE THUNDERSTORM DEVELOPMENT. WITH MLCAPES TO 1500 J/KG AND
40-50KT OF SHEAR...SUPERCELLS WILL BE LIKELY. PRIMARY THREAT WILL BE
LARGE HAIL AND DAMAGING WINDS.

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 28030.


...HALES

Severe Thunderstorm Watches in Minnesota, 2007Every severe thunderstorm watch in 2007

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.