

337 

WWUS20 KWNS 270009

SEL8

SPC WW 270009

MTZ000-NDZ000-270800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 538

NWS STORM PREDICTION CENTER NORMAN OK

710 PM CDT MON JUL 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR NORTHEAST MONTANA

       NORTHERN NORTH DAKOTA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 710 PM UNTIL

300 AM 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 35 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST NORTHWEST OF

WILLISTON NORTH DAKOTA TO 50 MILES EAST NORTHEAST OF DEVILS LAKE

NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 536...WW 537...



DISCUSSION...ISOLATED SUPERCELLS HAVE DEVELOPED INVOF W-E ORIENTED

SURFACE BOUNDARY WHERE TEMPERATURE-DEWPOINT SPREADS ARE LOWER AND

NEAR GROUND SHEAR STRONGER.  AS SUCH...LOCAL ENVIRONMENT WILL FAVOR

THE DEVELOPMENT OF TORNADOES IN ADDITION TO LARGE HAIL AND DAMAGING

WIND GUSTS THROUGH THE REMAINDER OF THE EVENING.



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 28025.





...MEAD

