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WWUS20 KWNS 241904

SEL5

SPC WW 241904

MNZ000-NDZ000-250300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 215

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT MON MAY 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST MINNESOTA

       SOUTH CENTRAL AND EASTERN NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES SOUTH SOUTHEAST OF

BISMARCK NORTH DAKOTA TO 25 MILES NORTH NORTHWEST OF THIEF RIVER

FALLS MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 212...WW 213...WW 214...



DISCUSSION...THE SURFACE WARM FRONT CONTINUES TO MOVE NWD INTO SRN

ND AND NW MN IN ADVANCE OF THE EJECTING MIDLEVEL TROUGH AND SURFACE

LOW APPROACHING THE CENTRAL HIGH PLAINS.  GIVEN THE BOUNDARY LAYER

DEWPOINTS NEAR 70 F AND SOME SURFACE HEATING S OF THE

FRONT...MODERATE INSTABILITY /MLCAPE NEAR 2500 J PER KG/ WILL

CONTINUE TO SPREAD NWD INTO SRN/ERN ND THIS AFTERNOON.

MEANWHILE...DEEP-LAYER AND LOW-LEVEL VERTICAL SHEAR ARE FAVORABLE

FOR SUPERCELLS ALONG THE WARM FRONT.  A FEW TORNADOES WILL BE

POSSIBLE THIS AFTERNOON/EVENING...ESPECIALLY ALONG THE BOUNDARY...AS

CONVECTION INCREASES AND SPREADS NEWD FROM SD INTO ND.

OTHERWISE...LARGE HAIL AND DAMAGING WINDS WILL BE LIKELY WITH THE

STRONGER STORMS.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22040.





...THOMPSON

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