

362 

WWUS20 KWNS 202020

SEL7

SPC WW 202020

MNZ000-NDZ000-SDZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 337

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT FRI JUN 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  MUCH OF NORTHERN AND CENTRAL MINNESOTA

  FAR EASTERN NORTH DAKOTA

  EXTREME NORTHEAST SOUTH DAKOTA



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

  1000 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 115

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTHWEST

OF FARGO NORTH DAKOTA TO 45 MILES EAST OF BRAINERD MINNESOTA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 336...



DISCUSSION...THUNDERSTORMS HAVE BEGUN TO DEVELOP NEAR AND AHEAD OF

AN ADVANCING COOL FRONT CROSSING THE ND/MN BORDER REGION ATTM.

LIMITED INSTABILITY IS INDICATED AHEAD OF THE FRONT AS

BOUNDARY-LAYER MOISTURE REMAINS SOMEWHAT LACKING.  THAT

SAID...STRONGER FLOW ALOFT IS YIELDING SHEAR FAVORABLE FOR

SUPERCELLS...AND WITH AT LEAST ISOLATED ADDITIONAL DEVELOPMENT

LIKELY GIVEN STRENGTH OF FOCUSED UVV...HAIL AND LOCALLY DAMAGING

WIND RISK SHOULD INCREASE OVER THE NEXT COUPLE OF 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 450. MEAN STORM

MOTION VECTOR 27035.





...GOSS

