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Mesoscale Discussion 367
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   MESOSCALE DISCUSSION 0367
   NWS STORM PREDICTION CENTER NORMAN OK
   0746 PM CDT SAT APR 18 2015

   AREAS AFFECTED...PORTIONS OF WRN/NRN OK...WRN NORTH TX...FAR ERN TX
   PANHANDLE

   CONCERNING...TORNADO WATCH 73...

   VALID 190046Z - 190215Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 73 CONTINUES.

   SUMMARY...THE RISK FOR SVR TSTMS CONTINUES ACROSS TORNADO WATCH 73.

   DISCUSSION...WITH INCREASED CONVECTIVE COVERAGE ACROSS PORTIONS OF
   WRN OK INVOF AND N OF I-40 -- INCLUDING NUMEROUS CELL
   MERGERS/BOUNDARY INTERACTIONS -- THE OVERALL TORNADO POTENTIAL WILL
   CONTINUE TO LESSEN ESPECIALLY WITH THE ONSET OF NOCTURNAL COOLING.
   REGARDLESS...THE 00Z OUN RAOB SAMPLED H7-H5 LAPSE RATES AROUND 7.5
   C/KM SUPPORTING MODERATE POTENTIAL INSTABILITY AND AROUND 30 KT OF
   EFFECTIVE BULK SHEAR. AREAS WHERE CONVECTIVE OVERTURNING HAS NOT
   BEEN SUBSTANTIAL MAY BE SUBJECT TO SOME SVR RISK BEYOND THE
   SCHEDULED 02Z EXPIRATION TIME OF THE WW. INCREASING LARGE-SCALE
   DCVA/ASCENT FROM THE W WILL CONTINUE TO MAINTAIN SUCH POTENTIAL --
   MAINLY WITH SVR HAIL -- INTO THE NIGHT. IT IS POSSIBLE THAT PORTIONS
   OF SEVERE THUNDERSTORM WATCH 77 COULD BE EXTENDED WWD TO ADDRESS
   THIS POTENTIAL ACROSS PARTS OF WRN OK AND WRN N TX.

   ..COHEN.. 04/19/2015


   ATTN...WFO...OUN...LUB...AMA...

   LAT...LON   35010019 36639970 36839858 36539818 36219840 35169843
               33769849 33699978 34100033 35010019 

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Page last modified: April 19, 2015
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