DAY 1 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 1249 AM CDT MON JUL 08 2013 VALID 081200Z - 091200Z ...THERE IS A SLGT RISK OF SVR TSTMS FOR THE NRN/CNTRL PLAINS... ...SYNOPSIS... PROGRESSIVE NRN STREAM WILL BE IN PLACE TODAY POLEWARD OF A MIDLEVEL ANTICYCLONE CENTERED OVER THE SWRN/S-CNTRL CONUS. A STRONG UPPER TROUGH WILL ADVANCE E FROM SASKATCHEWAN TO NRN ONTARIO BY 09/12Z...WHILE A SECOND WAVE MOVES FROM THE PAC NW INTO THE NRN HIGH PLAINS. A THIRD SHORTWAVE IMPULSE IS ALSO FORECAST TO MOVE FROM THE GREAT BASIN INTO THE NRN PLAINS DURING THE AFTERNOON AND EVENING. MEANWHILE OVER THE E COAST...AN UPPER-LEVEL SHORTWAVE TROUGH WILL MOVE FROM THE MID-ATLANTIC REGION TO OFFSHORE OF SRN NEW ENGLAND BY TONIGHT. A COLD FRONT ASSOCIATED WITH THE CANADIAN DISTURBANCE WILL ADVANCE SWD INTO THE NRN PLAINS LATER TODAY. S OF THIS FEATURE...LOW PRESSURE IS FORECAST TO DEEPEN OVER THE HIGH PLAINS AND EJECT ENEWD TOWARD THE UPPER MS VALLEY OVERNIGHT. A SECOND FRONTAL BOUNDARY ANALYZED EARLY THIS MORNING FROM THE UPPER MIDWEST SWWD INTO THE MID MO RIVER VALLEY WILL GRADUALLY SHIFT SEWD INTO LOWER MI LATER TODAY AND EXTEND WWD TOWARD NEB/SD.
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