SPC AC 160558
   
   DAY 2 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1258 AM CDT TUE SEP 16 2008
   
   VALID 171200Z - 181200Z
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...SYNOPSIS...
   BROAD UPR TROUGH CURRENTLY SITUATED FROM QUEBEC SWWD TO THE SPLNS
   WILL MOVE SLOWLY E TO LIE FROM NEW ENGLAND TO THE SERN STATES BY
   WEDNESDAY EVENING.  STRONGER PART OF THIS TROUGH WILL EXIST ACROSS
   SERN CANADA ASSOCD WITH A STRONG VORTEX OVER FAR NRN QUEBEC.  TO THE
   W...IN WAKE OF AN UPR HIGH THAT WILL MOVE INTO THE CENTER OF THE
   COUNTRY...THE UPR LOW A COUPLE HUNDRED MILES W OF KSFO WILL OPEN
   INTO A WAVE AND MIGRATE INTO THE INTERMOUNTAIN W/NW GRT BASIN REGION
   BY WEDNESDAY NIGHT. 
   
   ...N FL AND PORTIONS OF CSTL GA...
   BUILDING SFC PRESSURES ACROSS THE CNTRL/ERN STATES WILL FORCE THE
   BAROCLINIC ZONE OVER THE SERN STATES SLOWLY SWD INTO NEARSHORE
   WATERS OF NC/SC AND CSTL GA SWWD INTO PARTS OF N FL THROUGH
   WEDNESDAY.  AIR MASS ALONG/S OF THE FRONT WILL REMAIN
   MOIST...CHARACTERIZED BY PWAT VALUES AOA 1.75 IN AND SFC DEW POINTS
   IN THE LWR-MID 70S.  AS SRN PORTION OF THE UPR TROUGH SPREADS
   EWD...MID-LVL TEMPERATURES WILL DECREASE INTO THE MINUS 8 TO MINUS
   10C RANGE ALONG WITH AN INCREASE IN H25 SWLY WINDS AOA 40-50 KTS. 
   TSTMS WILL DEVELOP VCNTY THE FRONT AND SWD THROUGH THE FL PENINSULA
   ALONG LAKE/SEABREEZES WEDNESDAY AFTN.  GIVEN THE INCREASING HIGH LVL
   WINDS...APCHG TROUGH/LIFT AND FAVORABLE THERMODYNAMICS...ISOLD TSTMS
   MAY APCH OR EXCEED SVR LIMITS WITH LRG HAIL/DMGG WIND GUSTS.
   
   ...INTERMOUNTAIN W...
   MODELS ARE INSISTENT ON GRADUALLY INCREASING LOW/MID-LVL MOISTURE
   ACROSS THE LWR CO RVR VLY/SRN CA DURING THE NEXT COUPLE OF DAYS
   /SOME SIGNS OF THIS PROCESS ALREADY ONGOING IN NRN MEXICO ATTM/. 
   SOME OF THIS MOISTURE WILL ADVECT NWD AHEAD OF THE NEGATIVE-TILT UPR
   WAVE INTO THE GRT BASIN.  STEEP LOW/MID-LVL LAPSE RATES... COURTESY
   OF STRONG LOW-LVL WARMING AND H5 TEMPERATURES AOB MINUS 12 DEG
   C...WILL BE FAVORABLE FOR WDLY SCT TSTMS ACROSS PRIMARILY HIGHER
   TERRAIN LOCATIONS OF SRN CA/SRN SIERRA EWD INTO PARTS OF THE
   AZ/NM/CO PLATEAU AND UT.  FARTHER N...FCST SOUNDINGS INDICATE
   PRIMARILY MID-LVL MOISTENING ASSOCD WITH ASCENT/COOLING AHEAD OF THE
   AFOREMENTIONED WAVE.  PWAT VALUES LESS THAN 0.75 IN WILL FOSTER
   HIGH-BASED TCU/CBS OVER THE MOUNTAINS WITH GENERALLY DRY
   LIGHTNING/GUSTY WINDS EXPECTED OVER NRN NV/SW ID AND PARTS OF ORE.
   
   ..RACY.. 09/16/2008
   
   CLICK TO GET WUUS02 PTSDY2 PRODUCT

   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z