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Tornado Watch Until 9 PM (includes Twin Cities metro)

  • Blog Post by: Paul Douglas
  • August 6, 2013 - 2:39 PM

Tornado Watch Until 9 PM. NOAA SPC has issued a Tornado Watch which encompasses much of central and southern Minnesota, including the Twin Cities metro area, meaning conditions are ripe for isolated supercell T-storms capable of large hail and a few tornadoes. Stay alert for severe storms, the best chance between 6 PM and 8 PM this evening in Minneapolis/St. Paul and suburbs. Details:

URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 474
   NWS STORM PREDICTION CENTER NORMAN OK
   225 PM CDT TUE AUG 6 2013

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     CENTRAL MINNESOTA
     SOUTHEASTERN NORTH DAKOTA
     NORTHWESTERN WISCONSIN

   * EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
     900 PM CDT.

   * PRIMARY THREATS INCLUDE...
     A FEW TORNADOES POSSIBLE
     SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
       EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
     SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH NORTHWEST OF
   ORTONVILLE MINNESOTA TO 60 MILES EAST NORTHEAST OF MINNEAPOLIS
   MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   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.

   &&

   DISCUSSION...AS A 50+ KT WESTERLY 500 MB JET STREAK CONTINUES TO
   NOSE EASTWARD ACROSS THE NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY
   REGION LATE THIS AFTERNOON...DESTABILIZATION IS EXPECTED TO BECOME
   SUFFICIENT FOR SUPERCELL DEVELOPMENT IN THE WARM SECTOR OF A WEAK
   SURFACE WAVE.  WITH SOME STRENGTHENING OF SOUTHERLY LOW-LEVEL FLOW
   FIELDS...A REMNANT EFFECTIVE WARM FRONTAL ZONE ACROSS CENTRAL
   MINNESOTA INTO THE MINNEAPOLIS AREA WILL PROVIDE A POTENTIAL FOCUS
   FOR TORNADIC DEVELOPMENT THROUGH EARLY EVENING.  OTHERWISE...THE
   EVOLUTION OF AN ORGANIZED MESOSCALE CONVECTIVE SYSTEM MAY EVENTUALLY
   OCCUR NEAR THE LOW AND ALONG A DEVELOPING COLD FRONT TRAILING TO THE
   WEST...WHICH SHOULD PROPAGATE EAST SOUTHEASTWARD WITH THE RISK FOR
   SEVERE WINDS AND HAIL ACROSS THE UPPER MISSISSIPPI VALLEY BY THIS
   EVENING.

   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   450. MEAN STORM MOTION VECTOR 29035.

 

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