WATCHES: Severe Thunderstorm Watch Number 503

WWUS20 KWNS 201939
SEL3
SPC WW 201939
NDZ000-210200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 503
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT TUE JUL 20 2010

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

NORTHERN NORTH DAKOTA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
900 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF
WILLISTON NORTH DAKOTA TO 80 MILES EAST OF MINOT NORTH DAKOTA.
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 502...

DISCUSSION...THUNDERSTORMS HAVE DEVELOPED AHEAD OF SHORTWAVE TROUGH
MOVING THROUGH EASTERN MT. THESE STORMS ARE IN AN ENVIRONMENT OF
COLD MID LEVEL TEMPERATURES AND STEEP LAPSE RATES...FAVORABLE FOR
LARGE HAIL AND LOCALLY DAMAGING WINDS. ACTIVITY IS LIKELY TO SPREAD
EASTWARD ACROSS WATCH AREA THROUGH THE EARLY EVENING.

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 450. MEAN STORM
MOTION VECTOR 27030.

...HART

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