Day 1 Convective Outlook

   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1252 AM CDT THU MAY 23 2013
   
   VALID 231200Z - 241200Z
   
   ...THERE IS A SLGT RISK OF SVR TSTMS OVER A PORTION OF THE SRN HIGH
   PLAINS...
   
   ...THERE IS A SLGT RISK OF SVR TSTMS OVER A PORTION OF THE NERN
   STATES...
   
   ...SYNOPSIS...
   
   BLOCKING UPPER PATTERN WILL PERSIST THURSDAY. UPPER LOW OVER THE
   MID-UPPER MS VALLEY WILL ADVANCE THROUGH THE OH VALLEY...WHILE
   ANOTHER TROUGH AMPLIFIES SWD INTO THE GREAT LAKES REGION. CLOSED
   UPPER LOW OVER THE WRN STATES WILL DRIFT ONLY SLOWLY EWD...WHILE AN
   UPPER RIDGE BUILDS ACROSS THE CNTRL STATES. AT THE SFC A COLD FRONT
   WILL MOVE THROUGH ERN PORTIONS OF THE OH VALLEY INTO THE ERN STATES.
   TRAILING PORTION OF THIS BOUNDARY WILL LIFT NWD THROUGH NRN TX AND
   OK...WHILE A DRYLINE BECOMES ESTABLISHED ACROSS WRN TX.