MESOSCALE DISCUSSION 1809
   NWS STORM PREDICTION CENTER NORMAN OK
   0231 AM CDT MON AUG 01 2011
   
   AREAS AFFECTED...NE ND...WRN MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 707...
   
   VALID 010731Z - 010900Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 707
   CONTINUES.
   
   THE SEVERE THREAT WILL CONTINUE ACROSS WW 707 WITH WIND DAMAGE
   LIKELY WITH A LINE MOVING INTO THE NERN PART OF THE WATCH. AN AREAL
   EXTENSION WILL LIKELY BE DONE ACROSS FAR NE ND AND FAR NW MN. NEW WW
   MAY BE REQUIRED ACROSS PARTS OF MN AROUND 10Z.
   
   A WELL-DEVELOPED BOWING LINE-SEGMENT ACROSS NE ND IS LOCATED ALONG A
   TIGHT GRADIENT OF MODERATE INSTABILITY ORIENTED FROM NW TO SE. THIS
   ORIENTATION OF THE INSTABILITY AXIS ALONG WITH STORM PROPAGATION
   SHOULD RESULT IN A RIGHTWARD TURN OF THE LINEAR MCS AFFECTING THE
   ERN PART OF WW 707 OVER THE NEXT FEW HOURS. STILL...THE NRN PART OF
   THE LINE MAY MOVE INTO AREAS ADJACENT TO THE CANADIAN BORDER WHICH
   WILL JUSTIFY AN AREAL EXTENSION OF THE WATCH. AS THE LINE APPROACHES
   THE ERN BOUNDARY OF THE WATCH...A NEW WATCH MAY BECOME NECESSARY
   WITH A WIND DAMAGE THREAT EXTENDING EWD INTO PART OF NCNTRL MN LATER
   THIS MORNING.
   
   ..BROYLES.. 08/01/2011
   
   
   ATTN...WFO...DLH...MPX...FGF...BIS...
   
   LAT...LON   46459389 48449559 48629781 48149861 47429874 46839780
               45739520 46459389