

072 

WWUS20 KWNS 262324

SEL1

SPC WW 262324

SDZ000-270700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 521...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

625 PM CDT FRI JUN 26 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 625 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 3 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTHWEST OF

CHAMBERLAIN SOUTH DAKOTA TO 40 MILES NORTH NORTHWEST OF ABERDEEN

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 517...WW 518...WW

519...WW 520...



DISCUSSION...A VERY MOIST/UNSTABLE AIR MASS CONTINUES TO MOVE NWD

THRU WATCH AREA AHEAD OF THE APPROACHING SEVERE THUNDERSTORMS TO THE

W.  MODEL FORECASTS ALL SUPPORT STRONG VEERING SHEAR PROFILES THRU

THE EVENING...WHICH SHOULD ENHANCE DEVELOPMENT OF SUPERCELLS

INCLUDING TORNADOES AND VERY LARGE HAIL.  ACTIVITY WILL MOVE

PROPAGATE NEWD ACROSS CENTRAL IN ERN SD DURING THE EVENING.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 24025.





...HALES



222 

WWUS20 KWNS 262324

SEL1

SPC WW 262324

SDZ000-270700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 521

NWS STORM PREDICTION CENTER NORMAN OK

625 PM CDT FRI JUN 26 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 625 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 3 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTHWEST OF

CHAMBERLAIN SOUTH DAKOTA TO 40 MILES NORTH NORTHWEST OF ABERDEEN

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 517...WW 518...WW

519...WW 520...



DISCUSSION...A VERY MOIST/UNSTABLE AIR MASS CONTINUES TO MOVE NWD

THRU WATCH AREA AHEAD OF THE APPROACHING SEVERE THUNDERSTORMS TO THE

W.  MODEL FORECASTS ALL SUPPORT STRONG VEERING SHEAR PROFILES THRU

THE EVENING...WHICH SHOULD ENHANCE DEVELOPMENT OF SUPERCELLS

INCLUDING TORNADOES AND VERY LARGE HAIL.  ACTIVITY WILL MOVE

PROPAGATE NEWD ACROSS CENTRAL IN ERN SD DURING THE EVENING.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 24025.





...HALES

