

053 

WWUS20 KWNS 202200

SEL9

SPC WW 202200

NDZ000-SDZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 469

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT WED AUG 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH CENTRAL NORTH DAKOTA

  NORTH CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 500 PM

  UNTIL 1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF BISMARCK NORTH DAKOTA TO 70 MILES SOUTH SOUTHEAST OF

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

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 468...



DISCUSSION...CLUSTERS OF STORMS WILL CONTINUE TO FORM NEAR THE

SURFACE LOW AND WARM FRONT NEAR THE ND/SD BORDER.  THE DOWNSTREAM

ENVIRONMENT IS AT LEAST MARGINALLY FAVORABLE FOR SUPERCELLS...WITH

THE POTENTIAL TO PRODUCE A FEW DAMAGING GUSTS AND LARGE HAIL FOR THE

NEXT SEVERAL HOURS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29015.





...THOMPSON



415 

WWUS20 KWNS 202200

SEL9

SPC WW 202200

NDZ000-SDZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 469

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT WED AUG 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH CENTRAL NORTH DAKOTA

  NORTH CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 500 PM

  UNTIL 1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF BISMARCK NORTH DAKOTA TO 70 MILES SOUTH SOUTHEAST OF

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

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 468...



DISCUSSION...CLUSTERS OF STORMS WILL CONTINUE TO FORM NEAR THE

SURFACE LOW AND WARM FRONT NEAR THE ND/SD BORDER.  THE DOWNSTREAM

ENVIRONMENT IS AT LEAST MARGINALLY FAVORABLE FOR SUPERCELLS...WITH

THE POTENTIAL TO PRODUCE A FEW DAMAGING GUSTS AND LARGE HAIL FOR THE

NEXT SEVERAL HOURS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29015.





...THOMPSON

