Severe Thunderstorm Watch 552

Issued

Jun 25, 2011, 8:14 PM CDT (01:14 UTC)

Expired

Jun 26, 2011, 2:17 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Rapid City radar (KUDX), 62 km from the middle of the area, began a volume at 01:17 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

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 1387Jun 25, 6:21 PM CDT
• Mesoscale Discussion 1391Jun 25, 11:27 PM CDT

750 
WWUS20 KWNS 260116
SEL2
SPC WW 260116
MTZ000-NEZ000-SDZ000-260600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 552
NWS STORM PREDICTION CENTER NORMAN OK
815 PM CDT SAT JUN 25 2011

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

       MONTANA
       NORTHERN NEBRASKA
       SOUTHWESTERN SOUTH DAKOTA

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 815 PM
UNTIL 100 AM 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 85 MILES NORTH
NORTHWEST OF PHILIP SOUTH DAKOTA TO 55 MILES SOUTH SOUTHWEST OF
VALENTINE NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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 550...WW 551...

DISCUSSION...STORMS MOVING NEWD OFF THE HIGHER TERRAIN OF WY ARE
SPREADING NEWD INTO SWRN SD...WRN AND NRN NEB WHERE MODERATE
INSTABILITY EXISTS ALONG WITH 40-50 KT VERTICAL SHEAR...SUPPORTIVE
OF SUPERCELLS AND BOWING SEGMENTS. DESPITE A COOLING BOUNDARY
LAYER...STORMS MAY HAVE THE POTENTIAL TO PRODUCE ISOLATED DAMAGING
WIND AND LARGE HAIL THE REMAINDER OF THE EVENING AS THEY DEVELOP
NEWD.

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 24035.


...DIAL

Severe Thunderstorm Watches in South Dakota, 2011Severe Thunderstorm Watches in Nebraska, 2011Every severe thunderstorm watch in 2011

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.