Bowing QLCS evolving in IL with uncapped STP
Posted by JAC on 4/24/2010, 6:32 pm


MESOSCALE DISCUSSION 0380
  NWS STORM PREDICTION CENTER NORMAN OK
  0514 PM CDT SAT APR 24 2010
 
  AREAS AFFECTED...ERN/NERN MO AND CENTRAL IL
 
  CONCERNING...TORNADO WATCH 97...
 
  VALID 242214Z - 242315Z
 
  THE SEVERE WEATHER THREAT FOR TORNADO WATCH 97 CONTINUES.
 
  EVOLVING QLCS WITH BOWING LINE SEGMENTS AND EMBEDDED SUPERCELLS IS
  MOVING E-NEWD AT 30 KT ACROSS THE MS RIVER AT 22Z. INTENSE SURFACE
  PRESSURE FALLS /2-3 MB PER HR/ ARE NOTED INVOF/IMMEDIATELY AHEAD OF
  SURFACE LOW OVER ERN MO...WITH STRONGLY BACKED ELY SURFACE WINDS
  DEVELOPING IN RESPONSE. SOME CLEARING IS OCCURRING AHEAD OF QLCS AND
  IN THE WAKE OF ANVIL CANOPY OVER ERN/CENTRAL IL. SURFACE HEATING
  WITHIN THIS CORRIDOR OF CLEARING COMBINED WITH AGEOSTROPHIC RESPONSE
  TO UPPER DIVERGENCE WITHIN LEFT EXIT REGION OF JET CORE POSITIONED
  OVER THE MID/LOWER MS VALLEY REGION WILL FAVOR RAPID DESTABILIZATION
  INTO CENTRAL IL...WITH MLCAPE VALUES AROUND 500-1000 J/KG.
  THUS...QLCS IS EXPECTED TO BE MAINTAINED WITHIN THIS ENVIRONMENT AS
  IT MOVES NEWD TOWARD CENTRAL IL. DAMAGING WINDS WILL BE LIKELY WITH
  THIS ACTIVITY...ALONG WITH ISOLATED TORNADOES GIVEN ENLARGED
  HODOGRAPH STRUCTURE OBSERVED IN LINCOLN VWP.
 
  ..GARNER.. 04/24/2010
 





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Particulary Dangerous Situation most of MS and adjacent states. High risk of tornadoes. - JAC, 4/24/2010, 8:34 am
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