Large pressure drop
Posted by JAC on 6/19/2009, 7:08 pm


MESOSCALE DISCUSSION 1241
  NWS STORM PREDICTION CENTER NORMAN OK
  0537 PM CDT FRI JUN 19 2009
 
  AREAS AFFECTED...PARTS OF ERN IA / MUCH OF CNTRL-NRN IL / NWRN AND
  W-CNTRL IND
 
  CONCERNING...SEVERE THUNDERSTORM WATCH 480...
 
  VALID 192237Z - 192330Z
 
  THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 480
  CONTINUES.
 
  ENHANCED DMGG WIND POTENTIAL LIKELY TO EVOLVE AND SPREAD EWD ACROSS
  ERN IL / WRN IND THIS EVENING. 
 
  RECENT TRENDS IN RADAR MOSAIC ARE SHOWING A LEWP DEVELOPING ACROSS
  ERN IA EXTENDING INTO NWRN IL WITH A BROKEN SQUALL LINE FROM 35 MI
  NNW ALN TO 40 MI ENE MLI.  KOTM SURFACE OBSERVATION RECORDED SEVERE
  WIND GUSTS AROUND 60 KTS IN THE PAST HOUR.  MESOANALYSIS SHOWS A
  SUB-SYNOPTIC 1000MB SURFACE LOW 15 MI SSE CID WITH AN EFFECTIVE WARM
  FRONT/OUTFLOW BOUNDARY EXTENDING FROM 25 MI W OF RFD ESEWD THROUGH
  THE CHICAGO METRO TO 15 MI SW OF FWA.  SURFACE PRESSURE FALLS OF
  1-1.5 MB/HR HAVE BEEN NOTED ACROSS IL IN ADVANCE OF ERN MCS. 
 
  AREAS E AND S OF MCS AND AFOREMENTIONED BOUNDARIES /I.E. ERN HALF OF
  IL N OF I-70 AND E OF I-35-I-55/ HAVE BECOME MODERATELY-VERY
  UNSTABLE WITHIN A STRONG WLY AND DEEPLY SHEARED ENVIRONMENT.  AS
  SUCH...EXPECTING STORMS/COLD POOL TO CONTINUE TO ORGANIZE WITH BOTH
  MCS/S.  THE LEAD MCS WILL LIKELY POSE THE GREATEST THREAT FOR DMGG
  WINDS AS MS RIVER MCS INGESTS CONVECTIVELY OVERTURNED AIRMASS.  A
  CONCENTRATED SWATH OF SEVERE/DMGG WINDS IS BECOMING MORE
  LIKELY...ESPECIALLY ACROSS E-CNTRL AND NWRN IND.
 
  ..SMITH.. 06/19/2009
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Friday Afternoon Severe Weather for IA, IL, IN - JAC, 6/19/2009, 8:29 am
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