Skip Navigation Links www.nws.noaa.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
Storm Prediction Center
 
   

Search SPC
 

Mesoscale Discussion 1598
MD 1598 graphic
   
   MESOSCALE DISCUSSION 1598
   NWS STORM PREDICTION CENTER NORMAN OK
   1123 PM CDT THU JUL 03 2003
   
   AREAS AFFECTED...CNTRL/SRN MN...NRN IA AND WRN WI
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL...SEVERE THUNDERSTORM
   WATCH 629...630...
   
   VALID 040423Z - 040600Z
   
   TWO SEVERE MCS/S CONTINUE TO TRACK TOWARD THE UPPER MS VLY.  BOW
   ECHO NOW APPROACHING THE SD/ND/MN BORDER IS MOVING 290/47 KTS...AND
   IS RIDING AN INSTABILITY GRADIENT THAT IS SITUATED SEWD TOWARD THE
   MSP METRO AREA.  AT THE SAME TIME...ANOTHER LONG LIVED BOW ECHO WAS
   MOVING 245/50 KTS INTO SWRN MN AND NWRN IA AND IS LIKELY TO
   DEVELOP/TURN MORE ELY AS IT MOVES INTO SRN MN IN A COUPLE OF HOURS. 
   EXTRAPOLATION WOULD MERGE THE TWO MCS/S OVER SERN MN AND WRN WI
   BETWEEN 07-08 UTC.  DOWNSTREAM AIR MASS IS VERY MOIST AND UNSTABLE
   WITH SURFACE DEW POINTS IN THE 70S.  H5 FLOW IS EXPECTED TO
   STRENGTHEN CONSIDERABLY WITH AT LEAST 40 KTS OF FLOW.  COMBINATION
   OF MOIST BOUNDARY LAYER...WELL DEVELOPED FORWARD PROPAGATING MCS/S
   AND STRENGTHENING KINEMATICS ALL POINT TO A DAMAGING WIND THREAT
   CONTINUING ACROSS CNTRL/SRN MN AND NRN IA FOR SEVERAL HOURS.  THIS
   THREAT WILL LIKELY BE LONG LIVED AND MOVE INTO THE UPPER MS VLY
   AFTER ABOUT 07 UTC.  
   
   OTHERWISE...FARTHER WEST IN WS 629...A FEW ISOLD TSTM HAVE
   DEVELOPED/BEEN MAINTAINED ALONG A MYRIAD OF OUTFLOW BOUNDARIES WHERE
   AIR MASS WAS NOT OVERTURNED EARLIER THIS EVENING.  THESE STORMS WILL
   ADVANCE EWD ACROSS SRN SD AND PROBABLY WEAKEN WITH TIME LATER
   TONIGHT.
   
   ..RACY.. 07/04/2003
   
   
   ATTN...WFO...DLH...MPX...FGF...ABR...BIS...DMX...FSD...OAX...LBF...UNR...GRB...MKX...DVN...ARX...
   
   45679856 47309713 47319105 45679274 
   
   45649465 41709317 41760057 45930266 
   
   45389419 45609207 45229038 43598946 42459083 42759339 
   
Top/All Mesoscale Discussions/Forecast Products/Home