MESOSCALE DISCUSSION 0377
   NWS STORM PREDICTION CENTER NORMAN OK
   1101 PM CDT FRI APR 08 2011
   
   AREAS AFFECTED...FAR NORTHERN OK AND SOUTHEAST/EAST-CENTRAL KS INTO
   EXTREME SOUTHWEST MO
   
   CONCERNING...TORNADO WATCH 108...
   
   VALID 090401Z - 090500Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 108 CONTINUES.
   
   TORNADO WATCH 108 CONTINUES UNTIL 06Z...WITH THE PRIMARY SEVERE
   THREAT GENERALLY FOCUSED ALONG THE NORTHERN OK/SOUTHERN KS BORDER
   VICINITY.
   
   A PERSISTENT SUPERCELL CONTINUES TO GRADUALLY ADVANCE EASTWARD
   ACROSS FAR NORTHERN OK...NOW EAST OF I-35 IN KAY COUNTY AS OF 04Z.
   IT IS ANTICIPATED THAT THE PRIMARY/MOST CONCENTRATED SEVERE THREAT
   WILL REMAIN WITH THIS SUPERCELL ACROSS FAR NORTHEAST OK/PERHAPS
   EXTREME SOUTHEAST KS. WHILE NEAR-SURFACE CINH CONTINUES TO GRADUALLY
   INCREASE PER OBSERVATIONAL/OBJECTIVE ANALYSIS TRENDS...RELATIVELY
   MOIST/UNSTABLE INFLOW IN THE PRESENCE OF STEEP MID LEVEL LAPSE
   RATES...AND A STRONGLY SHEARED/HIGH HELICITY ENVIRONMENT /EFFECTIVE
   SHEAR OF 50+ KT AND EFFECTIVE SRH AROUND 400 M2 PER S2/...WILL
   SUPPORT STORM SUSTENANCE WITH A CONTINUED LARGE HAIL/BRIEF TORNADO
   THREAT. IT IS POSSIBLE THAT SOME DEGREE OF UPSCALE GROWTH MAY OCCUR
   /WITH A MODEST FORWARD ACCELERATION/ AND YIELD A CONTINUED SEVERE
   HAIL/WIND THREAT EVENTUALLY TOWARD THE I-44 VICINITY OF FAR
   NORTHEAST OK/EXTREME SOUTHEAST KS AND SOUTHWEST MO. FARTHER
   NORTH...A RELATIVELY MORE CHAOTIC STORM MODE WILL LIKELY CONTINUE
   WITH SPORADIC SEVERE HAIL/DAMAGING WINDS OTHERWISE REMAINING
   POSSIBLE ACROSS SOUTHEAST/EAST-CENTRAL KS.
   
   ..GUYER.. 04/09/2011
   
   
   ATTN...WFO...SGF...EAX...TSA...TOP...ICT...OUN...
   
   LAT...LON   36399654 36769736 37909709 38439636 38509527 36619443
               36399654