MESOSCALE DISCUSSION 0421
   NWS STORM PREDICTION CENTER NORMAN OK
   1127 PM CDT TUE APR 09 2013
   
   AREAS AFFECTED...NORTHWEST TX TO SOUTHWEST IA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 86...87...
   
   VALID 100427Z - 100530Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   86...87...CONTINUES.
   
   SUMMARY...THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG A CORRIDOR
   FROM NWRN TX INTO SWRN IA.  REPETITIVE THUNDERSTORM CLUSTERS CAPABLE
   OF PRODUCING AT LEAST MARGINALLY SEVERE HAIL COULD LINGER WELL INTO
   THE LATE NIGHT HOURS.
   
   DISCUSSION...850MB COLD FRONT IS GRADUALLY ADVANCING EWD AND
   CURRENTLY EXTENDS FROM SERN NEB...SSWWD ACROSS WRN OK INTO NWRN TX. 
   COINCIDENT WITH THIS FRONT...NUMEROUS THUNDERSTORM CLUSTERS HAVE
   EVOLVED WITH LATE EVENING DEVELOPMENT NOW OCCURRING ACROSS NWRN TX. 
   THIS ACTIVITY IS LIFTING NNEWD ALONG/AHEAD OF THE AFOREMENTIONED
   850MB FRONT AND IS SUPPLIED BY MOIST/BUOYANT ELEVATED PARCELS THAT
   YIELD MUCAPE ORDER OF 2000 J/KG ACROSS THE SRN PLAINS TO NEAR 1000
   J/KG ACROSS SERN NEB.  HAIL IS THE MOST LIKELY THREAT WITH THESE
   STORMS AND THE LARGEST SEVERE HAIL SHOULD BE LINKED TO THE MORE
   UNSTABLE AIRMASS ACROSS THE SRN PLAINS.  ADDITIONALLY...REPETITIVE
   THUNDERSTORMS MAY PRODUCE CONSIDERABLE ICING WHERE SFC TEMPERATURES
   HAVE DROPPED BELOW FREEZING.
   
   ..DARROW.. 04/10/2013
   
   
   ATTN...WFO...DMX...EAX...TSA...OAX...TOP...ICT...FWD...OUN...
   GID...DDC...LUB...
   
   LAT...LON   33490003 38719925 38719852 41039739 41039487 38789607
               38789647 33489742 33490003