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Tornado Watch central/southwest Minnesota until 10 PM (another noisy night shaping up)

  • Blog Post by: Paul Douglas
  • June 21, 2013 - 4:29 PM

Tornado Watch: 10 PM. NOAA SPC has issued a watch for much of southwest, west central and central Minnesota, including the far western suburbs of the Twin Cities, St. Cloud and Willmar, until 10 pm. With a nagging frontal boundary from near Watertown to Mankato there may be enough low-level wind shear for a few large tornadoes into the evening hours, especially southwestern Minnesota. Details from SPC:

URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 336
   NWS STORM PREDICTION CENTER NORMAN OK
   200 PM CDT FRI JUN 21 2013

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     NORTHWEST IOWA
     SOUTHWEST INTO CENTRAL MINNESOTA
     EASTERN SOUTH DAKOTA

   * EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
     1000 PM CDT.

   * PRIMARY THREATS INCLUDE...
     SEVERAL TORNADOES POSSIBLE
     NUMEROUS DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS
       TO 80 MPH POSSIBLE
     SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
       EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
   MILES EAST AND WEST OF A LINE FROM 20 MILES EAST NORTHEAST OF
   ALEXANDRIA MINNESOTA TO 50 MILES SOUTHWEST OF SIOUX FALLS SOUTH
   DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
   WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

   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.


   OTHER WATCH INFORMATION...CONTINUE...WW 335...

   DISCUSSION...UPSCALE CONVECTIVE GROWTH IS EXPECTED TO PERSIST WITH
   THE CONTINUED EVOLUTION OF A SEVERE MESOSCALE CONVECTIVE SYSTEM
   ACROSS EASTERN SOUTH DAKOTA INTO SOUTHWEST AND CENTRAL
   MINNESOTA...AND PARTS OF ADJACENT NORTHWEST IOWA...LATE THIS
   AFTERNOON AND EVENING.  IN THE PRESENCE OF THERMODYNAMIC PROFILES
   CHARACTERIZED BY STEEP MID-LEVEL LAPSE RATES AND LARGE
   CAPE...VERTICAL SHEAR WILL BE SUFFICIENT TO SUPPORT THE RISK FOR
   VERY LARGE HAIL AND LOCALLY STRONG WIND GUSTS NEAR STRONGEST STORMS.
    A COUPLE OF TORNADOES ARE ALSO POSSIBLE ALONG THE REMNANT
   BAROCLINIC ZONE ASSOCIATED WITH CONVECTIVE OUTFLOW GENERATED BY
   EARLY MORNING CONVECTION.

   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 24035.

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