

000 

WWUS20 KWNS 131954

SEL2

SPC WW 131954

MNZ000-NDZ000-140300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 592

NWS STORM PREDICTION CENTER NORMAN OK

250 PM CDT MON AUG 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST MINNESOTA

       EASTERN NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 250 PM UNTIL

1000 PM CDT.



HAIL TO 2.5 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHEAST OF GRAND FORKS NORTH DAKOTA TO 60 MILES SOUTH OF

DETROIT LAKES MINNESOTA.  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 591...



DISCUSSION...THE INITIAL ELEVATED STORMS OVER SE ND/WRN MN HAVE

WEAKENED SOME IN THE PAST 1-2 HOURS...BUT AN ADDITIONAL SUPERCELL

HAS DEVELOPED NW OF GFK.  MORE STORMS COULD FORM THIS AFTERNOON IN

THE ZONE OF ASCENT ACROSS EXTREME ERN ND/NW MN /DOWNSTREAM FROM THE

MID LEVEL TROUGH OVER CENTRAL ND/...WHILE THE ONGOING SUPERCELL WILL

LIKELY PERSIST FOR AT LEAST ANOTHER COUPLE OF HOURS GIVEN THE

MODERATE MID LEVEL INSTABILITY AND CLOUD LAYER SHEAR.  LARGE HAIL

SHOULD BE THE PRIMARY SEVERE THREAT...THOUGH ISOLATED DAMAGING GUSTS

COULD OCCUR...ESPECIALLY LATER THIS AFTERNOON/EVENING ACROSS THE SRN

PORTIONS OF THE WATCH AREA.



AVIATION...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 31030.





...THOMPSON

