Severe Thunderstorm Watch 409

Issued

Jun 19, 2012, 3:25 AM CDT (08:25 UTC)

Expired

Jun 19, 2012, 8:00 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Minneapolis radar (KMPX), 72 km from the middle of the area, began a volume at 08:28 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

50%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1215Jun 19, 2:39 AM CDT
• Mesoscale Discussion 1216Jun 19, 4:16 AM CDT
• Mesoscale Discussion 1218Jun 19, 6:22 AM CDT

998 
WWUS20 KWNS 190826
SEL9
SPC WW 190826
MNZ000-WIZ000-191300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 409
NWS STORM PREDICTION CENTER NORMAN OK
325 AM CDT TUE JUN 19 2012

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

       EAST CENTRAL MINNESOTA
       WEST CENTRAL WISCONSIN

EFFECTIVE THIS TUESDAY MORNING FROM 325 AM UNTIL 800 AM CDT.

HAIL TO 2 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH
NORTHWEST OF MANKATO MINNESOTA TO 60 MILES EAST OF EAU CLAIRE
WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 408...

DISCUSSION...EARLIER SUPERCELL CLUSTER HAS EVOLVED INTO A MORE
LINEAR MCS WITH SOME BOWING CHARACTERISTICS IMMEDIATELY SW OF MSP.
THIS CONVECTION WILL LIKELY PERSIST FOR SEVERAL MORE HOURS AS IT
PROGRESSES GENERALLY EWD NEAR OR JUST N OF THE SURFACE WARM
FRONT...WITH A FEED OF STRONG INSTABILITY FROM THE S/SW ON A 35-45
KT LLJ.  BOTH DAMAGING WINDS AND LARGE HAIL CAN BE EXPECTED WITH
THIS MCS AS IT MOVES FROM E CENTRAL MN INTO W CENTRAL WI THROUGH
ABOUT 12-13Z.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 26035.


...THOMPSON

Severe Thunderstorm Watches in Wisconsin, 2012Severe Thunderstorm Watches in Minnesota, 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.