MESOSCALE DISCUSSION 2259
   NWS STORM PREDICTION CENTER NORMAN OK
   0346 AM CST SUN DEC 23 2007
   
   AREAS AFFECTED...NERN IN/NWRN OH/LOWER MI
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 230946Z - 231145Z
   
   LOCALLY-STRONG WIND GUSTS OVER 50 KT WILL CONTINUE TO BE POSSIBLE IN
   CONJUNCTION WITH THE PASSAGE OF THE LOW-TOPPED CONVECTIVE LINE.  WW
   NOT ANTICIPATED.
   
   NARROW/LOW-TOPPED LINE OF SHOWERS CONTINUES MOVING NEWD ACROSS
   INDIANA/SWRN LOWER MI ATTM...IN ZONE OF VERY STRONG FORCING ALONG
   THE IMMEDIATE COLD FRONTAL ZONE.  STRONG SURFACE GRADIENT FLOW
   CONTINUES AT 25 TO 35 KT ON EITHER SIDE OF THE FRONT...BUT WITH FLOW
   GREATER THAN 50 KT JUST OFF THE SURFACE PER AREA VWPS...DOWNDRAFTS
   WITH THE CONVECTIVE LINE HAVE PROVEN SUFFICIENT TO TRANSFER HIGHER
   MOMENTUM FLOW TO THE SURFACE.  50 TO 60 KT GUSTS HAVE BEEN OBSERVED
   WITH THE PASSAGE OF THE CONVECTIVE LINE...AND THIS SHOULD CONTINUE
   LOCALLY FOR THE NEXT FEW HOURS AS THE LINE/FRONT PROGRESS EWD.  
   
   WITH INSTABILITY -- AND THUS LIGHTNING STRIKES -- VIRTUALLY
   NIL...SEVERE THUNDERSTORM WATCH WILL LIKELY NOT BE ISSUED. 
   HOWEVER...POTENTIAL FOR LOCALLY DAMAGING GUSTS WILL LIKELY PERSIST
   UNTIL THE MOST ACTIVE PORTION OF THIS LINE MOVES ACROSS LAKES HURON
   AND ERIE INTO ONTARIO.
   
   ..GOSS.. 12/23/2007
   
   
   ATTN...WFO...CLE...ILN...DTX...APX...IWX...GRR...IND...
   
   40338572 41758620 43278678 44388533 44298261 42878225
   42108314 41298264 40528357 39698577