IN under-the-gun
Posted by JAC on 6/19/2009, 11:50 am


MESOSCALE DISCUSSION 1232
  NWS STORM PREDICTION CENTER NORMAN OK
  1027 AM CDT FRI JUN 19 2009
 
  AREAS AFFECTED...PARTS OF SRN LOWER MI INTO NRN AND CNTRL IND
 
  CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
 
  VALID 191527Z - 191630Z
 
  THE THREAT FOR SEVERE STORMS CAPABLE OF DAMAGING WINDS...HAIL AND
  PERHAPS A COUPLE OF TORNADOES IS EXPECTED TO INCREASE LATE THIS
  MORNING INTO AFTERNOON.  A WW WILL BE REQUIRED.
 
  ONGOING STRONG/SEVERE STORMS OVER THE CHI METRO SHOULD CONTINUE TO
  INTENSIFY THIS MORNING WHILE MOVING/DEVELOPING EWD/SEWD INTO PARTS
  OF SWRN LOWER MI AND NRN IND.  ADDITIONAL STORMS ATTEMPTING TO
  BECOME SUSTAINED FROM JUST NE PIA TO ENE BMI SHOULD ALSO INCREASE IN
  COVERAGE AND INTENSITY WHILE SHIFTING INTO CNTRL IND.
 
  ABOVE-MENTIONED STORMS WILL REMAIN FOCUSED ALONG AND N OF A
  WELL-DEFINED OUTFLOW BOUNDARY EXTENDING FROM DNV TO NW OF LUK.
  GIVEN THE MOIST BOUNDARY LAYER CONDITIONS AND POTENTIAL FOR RATHER
  STRONG DIABATIC HEATING...AIR MASS IS EXPECTED TO BECOME MODERATELY
  UNSTABLE LATER TODAY WITH MLCAPE APPROACHING 1500-2500 J/KG.
  CURRENT PROFILER DATA OVER NWRN IND N OF OUTFLOW BOUNDARY INDICATES
  CONSIDERABLE VEERING IN THE LOWEST 2 KM WITH 50-55 KT OF DEEP-LAYER
  SHEAR.  AS SUCH...ENVIRONMENT IS FORECAST TO BECOME INCREASINGLY
  SUPPORTIVE OF SUPERCELL AND BOWING STRUCTURES CAPABLE OF DAMAGING
  WINDS...HAIL AND PERHAPS TORNADOES.
 
  ..MEAD.. 06/19/2009
12
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Friday Afternoon Severe Weather for IA, IL, IN - JAC, 6/19/2009, 8:29 am
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