MESOSCALE DISCUSSION 1759
   NWS STORM PREDICTION CENTER NORMAN OK
   0810 PM CDT TUE JUL 26 2011
   
   AREAS AFFECTED...SERN NORTH DAKOTA...NERN SOUTH DAKOTA...W CNTRL
   MINNESOTA
   
   CONCERNING...TORNADO WATCH 691...
   
   VALID 270110Z - 270245Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 691 CONTINUES.
   
   CONTINUED STRENGTHENING OF A SOUTHERLY 850 MB JET FROM 35 TO NEAR 50
   KT ACROSS THE EASTERN DAKOTAS INTO WESTERN MINNESOTA IS PROGGED
   THROUGH THE 02-04Z TIME FRAME.  AS THIS OCCURS...STRENGTHENING WARM
   ADVECTION WITHIN A BROAD WARM FRONTAL ZONE MAY CONTRIBUTE TO THE
   TRANSITION FROM SEMI-DISCRETE STORM DEVELOPMENT TO AN EVOLVING
   MESOSCALE CONVECTIVE SYSTEM IN THE PRESENCE OF STRONG DEEP LAYER
   SHEAR AND LARGE CAPE.  THIS ACTIVITY SEEMS LIKELY TO SPREAD ACROSS
   THE MINNESOTA BORDER AREA INTO WEST CENTRAL MINNESOTA NEAR
   ALEXANDRIA...AS A 40-50 KT 500 MB SPEED MAXIMUM NOSES EAST
   NORTHEASTWARD OUT OF CENTRAL SOUTH DAKOTA...AND MAY BE ACCOMPANIED
   BY A MORE PROMINENT RISK FOR DAMAGING WIND GUSTS.
   
   ..KERR.. 07/27/2011
   
   
   ATTN...WFO...MPX...FGF...FSD...ABR...
   
   LAT...LON   45739821 46329717 46729637 46579538 45989502 45619516
               45149571 44569652 44109791 44319860 44859836 45259878
               45739821