Categorical Graphic
Probabilistic Tornado Graphic
Probability of a tornado within 25 miles of a point. Hatched Area: 10% or greater probability of EF2 - EF5 tornadoes within 25 miles of a point.
Probabilistic Damaging Wind Graphic
Probability of damaging thunderstorm winds or wind gusts of 50 knots or higher within 25 miles of a point. Hatched Area: 10% of greater probability of wind gusts 65 knots or greater within 25 miles of a point.
Probabilistic Large Hail Graphic
Probability of hail 1" or larger within 25 miles of a point. Hatched Area: 10% or greater probability of hail 2" or larger within 25 miles of a point.

   SPC AC 181221
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0621 AM CST TUE DEC 18 2012
   
   VALID 181300Z - 191200Z
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...COASTAL PAC NW...
   OVERNIGHT IR IMAGERY INDICATES SHALLOW CELLULAR CONVECTION IS
   ONGOING ALONG/W OF THE PACIFIC COAST...WITHIN A POCKET OF COLD
   MIDLEVEL TEMPERATURES /E.G. AOB -30 C AT 500 MB PER 12Z REGIONAL
   RAOBS/. MODEL FORECAST SOUNDINGS SUGGEST LITTLE IF ANY DIURNAL
   HEATING WILL OCCUR TODAY DUE TO WIDESPREAD CLOUD COVER.
   HOWEVER...STEEP LOW- AND MIDLEVEL LAPSE RATES WILL BE SUFFICIENT TO
   YIELD SBCAPE VALUES UP TO 200 J/KG. FORCING FOR ASCENT ASSOCIATED
   WITH THE CYCLONIC EXIT REGION OF AN OFFSHORE JET STREAK WILL SUPPORT
   THE POTENTIAL FOR ISOLATED TSTMS THROUGH THE LATE
   AFTERNOON...PRIMARILY CONFINED TO THE IMMEDIATE COASTAL AREAS OF SRN
   WA...ORE...AND NRN CA. THE THREAT FOR TSTMS SHOULD DIMINISH AFTER
   19/00Z AS MIDLEVEL WAA AND HEIGHT RISES OCCUR AHEAD OF A SHORTWAVE
   UPPER RIDGE.
   
   ..ROGERS/EDWARDS.. 12/18/2012
   
   CLICK TO GET WUUS01 PTSDY1 PRODUCT

   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z