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022 

WWUS20 KWNS 222103

SEL0

SPC WW 222103

NDZ000-230400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 290

NWS STORM PREDICTION CENTER NORMAN OK

405 PM CDT TUE MAY 22 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH DAKOTA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 3 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 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF MINOT NORTH

DAKOTA TO 40 MILES EAST OF BISMARCK NORTH DAKOTA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU0).



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 288...WW 289...



DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP OVER EXTREME

NERN MT AS THE LEADING EDGE OF STRONG DYNAMIC FORCING FOR ASCENT

MOVES TOWARD THE DAKOTAS.  STORMS ARE EXPECTED TO SPREAD EWD AND

DEVELOP SWD ALONG THE COLD FRONT AS IT MOVES EWD ACROSS ND TONIGHT.

VAD PROFILES AT BIS/MOT EXHIBIT STRONG VEERING WITH HEIGHT AND 40-50

KT DEEP LAYER SHEAR...INDICATING POTENTIAL FOR SUPERCELLS TO

DEVELOP...ESPECIALLY ALONG/NORTH OF EAST/WEST WARM FRONT.  VERY

LARGE HAIL AND DAMAGING WIND GUSTS...ALONG WITH A FEW

TORNADOES...WILL BE POSSIBLE TONIGHT BEFORE ACTIVITY GROWS UPSCALE

INTO A FORWARD PROPAGATING MCS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24035.





...WEISS

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