MESOSCALE DISCUSSION 0573
   NWS STORM PREDICTION CENTER NORMAN OK
   0128 AM CDT SUN APR 26 2009
   
   AREAS AFFECTED...NRN OK INTO S-CNTRL/SERN KS
   
   CONCERNING...TORNADO WATCH 186...
   
   VALID 260628Z - 260800Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 186 CONTINUES.
   
   THROUGH 0730Z...EXPECT THE GREATEST SEVERE WEATHER
   THREAT...INCLUDING THE POTENTIAL FOR TORNADOES AND VERY LARGE
   HAIL...TO DEVELOP FROM ALFALFA...GARFIELD AND GRANT COUNTIES INTO
   KAY AND PERHAPS NRN NOBLE COUNTIES IN N-CNTRL OK.
   
   CURRENT RADAR LOOPS INDICATE VERY COMPLEX STORM AND MESO-SCALE
   INTERACTIONS OCCURRING OVER ALFALFA...GARFIELD AND GRANT
   COUNTIES...INCLUDING AN INTENSE SUPERCELL THAT RECENTLY PRODUCED A
   POSSIBLE TORNADO IN THE LAHOMA/MENO OK AREA.  AREA VWPS INDICATE 
   VERY STRONG LOW-LEVEL SHEAR /0-1 KM SHEAR OF 40-45 KT/ OWING TO THE
   PRESENCE OF A NOCTURNAL 60-65 KT LLJ.  RUC PROXIMITY SOUNDINGS
   MODIFIED FOR SURFACE OBSERVATIONS WITHIN IMMEDIATE STORM INFLOW
   REGION INDICATE THAT AIR MASS REMAINS MODERATELY UNSTABLE /MLCAPE
   AROUND 1000 J PER KG/ WITH MLCIN VALUES OF GENERALLY LESS THAN 100
   J/KG.  
   
   GIVEN THE STRONG MESOCYCLONES CURRENTLY BEING OBSERVED...STORMS
   SHOULD REMAIN FIRMLY ROOTED IN THE BOUNDARY LAYER THROUGH 07-08Z
   WITH A CONTINUED THREAT FOR TORNADOES IN ADDITION TO VERY LARGE
   HAIL.  THEREAFTER...FORECAST SOUNDINGS SUGGEST THAT STRENGTHENING
   CONVECTIVE INHIBITION MAY BECOME SUFFICIENT ENOUGH SUCH THAT
   INTERNAL STORM CIRCULATIONS MAY BECOME DISRUPTED.  WHILE THE
   ASSOCIATED TORNADO THREAT MAY BEGIN TO DIMINISH AT THIS TIME...THE
   POTENTIAL FOR DAMAGING WINDS AND/OR SEVERE HAIL MAY CONTINUE AS
   STORMS ARE SUSTAINED BY STRONG/DEEP ASCENT ALONG GROWING SYSTEM COLD
   POOL.
   
   ..MEAD.. 04/26/2009
   
   
   ATTN...WFO...SGF...TSA...ICT...OUN...DDC...
   
   LAT...LON   36099967 36729962 37209877 37579744 38039584 38009492
               36819482 36209600 35409886 35379942 35679959 36099967