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147 

WWUS20 KWNS 220223

SEL8

SPC WW 220223

MNZ000-WIZ000-LSZ000-220900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 428

NWS STORM PREDICTION CENTER NORMAN OK

920 PM CDT MON JUL 21 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  THE NORTHERN HALF OF MINNESOTA

  EXTREME NORTHWEST WISCONSIN

  LAKE SUPERIOR



* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 920 PM

  UNTIL 400 AM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS

    TO 75 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHWEST OF

ELY MINNESOTA TO 40 MILES EAST SOUTHEAST OF ALEXANDRIA MINNESOTA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 427...



DISCUSSION...WELL-DEVELOPED MCS WITH BOW/COMMA HEAD STRUCTURE WILL

CONTINUE EWD/ENEWD INTO NRN MN...ALONG A SLOW-MOVING FRONT.

SHORT-LIVED CIRCULATIONS WILL BE POSSIBLE IN THE NEXT COUPLE HOURS

WHERE THE BOW INTERSECTS THE FRONT...AND AN ISOLATED TORNADO OR TWO

MAY OCCUR.  HOWEVER...DAMAGING GUSTS WITH THE BOWING SEGMENTS WILL

CONTINUE TO BE THE PRIMARY SEVERE STORM THREAT.  THOUGH THE MCS IS

NOW PASSING THE CORRIDOR OF GREATEST INSTABILITY...LOW 70S BOUNDARY

LAYER DEWPOINTS WILL SUPPORT SUBSTANTIAL CAPE ACROSS MN WELL INTO

THE OVERNIGHT HOURS.  EXPECT THE SRN PORTION OF THE LINE TO MOVE

GENERALLY EWD WITH A RISK FOR AT LEAST ISOLATED DAMAGING WINDS/HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27040.





...THOMPSON

