MESOSCALE DISCUSSION 2186
   NWS STORM PREDICTION CENTER NORMAN OK
   0549 PM CDT SAT SEP 17 2011
   
   AREAS AFFECTED...NW TX...WRN  AND NRN OK...S CNTRL KS
   
   CONCERNING...TORNADO WATCH 850...851...
   
   VALID 172249Z - 180045Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 850...851...CONTINUES.
   
   STORMS HAVE INTENSIFIED DURING PEAK HEATING WITH STEEP LAPSE RATES
   NEAR THE DRYLINE. HELPING TO ENHANCE CONVERGENCE IS A WEAK UPPER
   VORT MOVING EWD ACROSS SRN KS/NRN OK. FORCING IS CURRENTLY MAXIMIZED
   WHERE THESE FEATURES INTERSECT THE WARM FRONT ACROSS NRN OK WHERE A
   POTENTIALLY TORNADIC STORM WAS ONGOING. 
   
   AMPLE MOISTURE AND INSTABILITY WILL CONTINUE TO FUEL STRONG UPDRAFTS
   NEAR THE DRYLINE AND WARM FRONT. STORM MOTIONS WILL CONTINUE TO BE
   RELATIVELY SLOW OWING TO MARGINAL FLOW ALOFT...BUT VEERING WINDS
   WITH HEIGHT IN THE LOWEST FEW KM WILL CONTINUE TO BE SUFFICIENT FOR
   SUPERCELL STRUCTURES...CAPABLE OF LARGE HAIL.
   
   WITH TIME...CELLS OVER NWRN OK...WHERE STRONGER WIND FIELDS
   EXIST...MAY MERGE INTO A CLUSTER OR SMALL MCS...CONTINUING EWD WITH
   A DAMAGING WIND AND HAIL THREAT. IT IS POSSIBLE THAT PORTIONS OF
   NERN OK AND/OR SERN KS MAY NEED TO BE ADDRESSED LATER THIS EVENING.
   
   ..JEWELL.. 09/17/2011
   
   
   ATTN...WFO...TSA...ICT...FWD...OUN...DDC...SJT...
   
   LAT...LON   32769976 33699937 35209920 36149940 36909950 37409876
               37199761 36639671 36059637 35899749 34879815 33559856
               32719900 32769976