Tornado Watch 413

Issued

Jun 19, 2012, 6:08 PM CDT (23:08 UTC)

Expired

Jun 20, 2012, 1:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Minneapolis radar (KMPX), 168 km from the middle of the area, began a volume at 23:08 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

30%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

40%

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

60%

• Mesoscale Discussion 1224Jun 19, 4:56 PM CDT
• Mesoscale Discussion 1226Jun 19, 9:12 PM CDT
• Mesoscale Discussion 1228Jun 19, 11:37 PM CDT

633 
WWUS20 KWNS 192316
SEL3
SPC WW 192316
MNZ000-SDZ000-WIZ000-200600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 413
NWS STORM PREDICTION CENTER NORMAN OK
610 PM CDT TUE JUN 19 2012

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

       CENTRAL MINNESOTA
       NORTHEAST SOUTH DAKOTA
       NORTHWEST WISCONSIN

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 610 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST OF WATERTOWN
SOUTH DAKOTA TO 125 MILES EAST NORTHEAST OF SAINT CLOUD
MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 412...

DISCUSSION...INTENSE WARM FRONT EXTENDS IN A ENEWD FASHION FROM A
SFC LOW IN ERN SD...ACROSS CNTRL MN...AND INTO NRN WI. A VERY
MOIST...UNSTABLE AND CURRENTLY CAPPED AIR MASS EXISTS NEAR THE SFC
LOW AND ALONG THE FRONT. E TO ENE SFC WINDS NEAR THE FRONTAL ZONE
VEER STRONGLY TO SLY JUST ABOVE THE SURFACE AND THE SWLY AT MID
LEVELS RESULTING IN VOLATILE EFFECTIVE SRH VALUES IN EXCESS OF 500
M2/S2 AND PRONOUNCED HODOGRAPH CURVATURE. GIVEN MOIST BOUNDARY LAYER
FOCUSED ALONG THE BOUNDARY...LFC IS ALSO LOCALLY LOW NEAR THE FRONT
AND SUPPORTIVE OF STORM UPDRAFTS INITIATING NEARER THE SFC. THERE IS
CONSIDERABLE UNCERTAINTY...HOWEVER...REGARDING SFC-BASED STORM
INITIATION IN SUCH A STRONGLY CAPPED REGIME. HOWEVER...TIME OF DAY
AND STRENGTHENING FORCING FOR DEEP ASCENT IN THE FORM OF AN
APPROACHING SHORT WAVE TROUGH AND STRENGTHENING LLJ...WHEN COMBINED
WITH SUCH A SUPPORTIVE KINEMATIC ENVIRONMENT FOR TORNADO
POTENTIAL...WARRANT THE ISSUANCE OF THE TORNADO WATCH ALONG THE WARM
FRONT THIS EVENING.

AVIATION...TORNADOES AND 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
500. MEAN STORM MOTION VECTOR 25025.


...CARBIN

Tornado Watches in Minnesota, 2012Tornado Watches in South Dakota, 2012Tornado Watches in Wisconsin, 2012Every tornado 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.