Severe Thunderstorm Watch 613

Issued

Sep 3, 2012, 4:03 PM CDT (21:03 UTC)

Expired

Sep 3, 2012, 10:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Aberdeen radar (KABR), 193 km from the middle of the area, began a volume at 21:05 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

10%

One or more EF2 to EF5 tornadoes

2%

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

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1872Sep 3, 3:24 PM CDT
• Mesoscale Discussion 1877Sep 3, 7:18 PM CDT

032 
WWUS20 KWNS 032106
SEL3
SPC WW 032106
NEZ000-SDZ000-040300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 613
NWS STORM PREDICTION CENTER NORMAN OK
405 PM CDT MON SEP 3 2012

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

       CENTRAL AND NORTHEASTERN NEBRASKA
       CENTRAL AND SOUTHEASTERN SOUTH DAKOTA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 405 PM UNTIL
1000 PM CDT.

HAIL TO 2 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 EAST AND WEST OF A LINE FROM 65 MILES NORTH
NORTHWEST OF HURON SOUTH DAKOTA TO 10 MILES SOUTH OF BURWELL
NEBRASKA.  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 611...WW 612...

DISCUSSION...TSTMS JUST BEGINNING TO FORM OVER CNTRL PORTIONS OF SD
AND NEB EXPECTED TO INCREASE IN COVERAGE/STRENGTH THROUGH EARLY EVE
AS ASCENT INCREASES IN ZONE OF LOW LVL HEATING/MOISTURE AHEAD OF
CNTRL HI PLNS SHORTWAVE IMPULSE. LOW-LVL FLOW WILL REMAIN WEAK...BUT
OVERALL SETUP SUGGESTS POTENTIAL FOR A FEW SUSTAINED STORMS WITH SVR
HAIL AND HIGH WIND THROUGH MID EVE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27030.


...CORFIDI

Severe Thunderstorm Watches in South Dakota, 2012Severe Thunderstorm Watches in Nebraska, 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.