Tornado Watch 367

Issued

Jun 21, 2010, 2:08 PM MDT (20:08 UTC)

Expired

Jun 21, 2010, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

4 in

Strongest gust expected

70 kt

The Rapid City radar (KUDX), 191 km from the middle of the area, began a volume at 20:08 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

60%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

90%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1057Jun 21, 1:36 PM MDT
• Mesoscale Discussion 1063Jun 21, 5:03 PM MDT
• Mesoscale Discussion 1066Jun 21, 6:42 PM MDT

290 
WWUS20 KWNS 212009
SEL7
SPC WW 212009
MTZ000-NEZ000-SDZ000-WYZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 367
NWS STORM PREDICTION CENTER NORMAN OK
310 PM CDT MON JUN 21 2010

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

       SOUTHEASTERN MONTANA
       PARTS OF NEBRASKA PANHANDLE
       PARTS OF WESTERN SOUTH DAKOTA
       A LARGE PART OF EASTERN WYOMING

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 310 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF
MILES CITY MONTANA TO 25 MILES WEST OF SIDNEY NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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 366...

DISCUSSION...AIR MASS HAS BECOME VERY UNSTABLE ACROSS THE WATCH WITH
LITTLE REMAINING CINH.  WITH APPROACH OF THE UPPER TROUGH AND
ASSOCIATED STRONGER SHEAR...CONDITIONS SUPPORT DEVELOPMENT OF
SUPERCELLS.  SEVERE THUNDERSTORMS WILL FORM VICINITY HIGHER TERRAIN
AND DEVELOP/MOVE EWD. SUPERCELLS WILL BE ASSOCIATED WITH VERY LARGE
HAIL AND POSSIBLE TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24030.


...HALES

Tornado Watches in Wyoming, 2010Tornado Watches in Nebraska, 2010Tornado Watches in South Dakota, 2010Every tornado watch in 2010

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.