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Mesoscale Discussion 227
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   MESOSCALE DISCUSSION 0227
   NWS STORM PREDICTION CENTER NORMAN OK
   0916 AM CDT WED APR 08 2015

   AREAS AFFECTED...PARTS OF THE CNTRL OH VALLEY

   CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY 

   VALID 081416Z - 081615Z

   PROBABILITY OF WATCH ISSUANCE...80 PERCENT

   SUMMARY...ORGANIZED MCS WITH A HISTORY OF ISOLATED HAIL UP TO 1 INCH
   AND STRONG WIND GUSTS OF 40-50 MPH APPEARS TO BE INTENSIFYING AS
   GRADUAL DIABATIC HEATING OCCURS DOWNSTREAM.

   DISCUSSION...RECENT REPORT OF WIND DAMAGE IN RUSH COUNTY IND
   OCCURRED ALONG THE APEX OF A SQUALL LINE THAT HAS ACCELERATED TO
   NEAR 45-KT FORWARD PROPAGATION. ALTHOUGH ABUNDANT CLOUD COVERAGE IS
   LIMITING DIABATIC HEATING IMMEDIATELY DOWNSTREAM...POCKETS OF
   GREATER INSOLATION ARE APPARENT IN VISIBLE IMAGERY TOWARDS THE OH
   RIVER WHERE SURFACE TEMPERATURES HAVE HEATED INTO THE MIDDLE 60S.
   MODIFIED 12Z ILN RAOB SUGGESTS SURFACE TEMPERATURES AROUND 70 WILL
   BE SUFFICIENT FOR A PREDOMINANT TRANSITION TO SURFACE-BASED
   CHARACTER WITH STEEP TROPOSPHERIC LAPSE RATES. THIS COULD RESULT IN
   AN INCREASING WIND DAMAGE THREAT THROUGH MIDDAY.

   ..GRAMS/CORFIDI.. 04/08/2015


   ATTN...WFO...RLX...JKL...ILN...LMK...IND...

   LAT...LON   40198439 40088392 39858309 39358247 38718218 38268224
               37898242 37828287 37828357 37888426 38038498 38228532
               38548589 38818597 39098573 39218534 39548486 40198439 

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Page last modified: April 08, 2015
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