Categorical Graphic
Probabilistic Tornado Graphic
Probabilistic Damaging Wind Graphic
Probabilistic Large Hail Graphic

   SPC AC 041959
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0259 PM CDT WED JUN 04 2008
   
   VALID 042000Z - 051200Z
   
   ...THERE IS A MDT RISK OF SVR TSTMS ACROSS SRN WF...CENTRAL AND NRN
   VA...MUCH OF MD...DE...AND SRN NJ...
   
   ...THERE IS A MDT RISK OF SVR TSTMS ACROSS PARTS OF SRN AND ERN
   NEB...NRN KS...SWRN IA...AND NWRN MO...
   
   ...THERE IS A SLGT RISK OF SVR TSTMS ACROSS A LARGE W-E ZONE FROM
   THE CENTRAL HIGH PLAINS TO THE MID-ATLANTIC REGION...
   
   ...OH VALLEY INTO THE MID-ATLANTIC REGION...
   SEVERAL STORM CLUSTERS/BOWING SEGMENTS CONTINUE MOVING ACROSS THE OH
   VALLEY EWD INTO THE MID-ATLANTIC REGION...INCLUDING A SIGNIFICANT
   BOW ECHO MOVING EWD AT 50 KT TOWARD THE DELMARVA PENINSULA.  THIS
   BOW HAS PRODUCED WIDESPREAD WINDS IN EXCESS OF 50 TO 55 KT...AND
   WITH FAVORABLE DOWNSTREAM AIRMASS...EXPECT A SWATH OF DAMAGING WINDS
   AND HAIL TO EXTEND TO THE NJ/DE COAST OVER THE NEXT HOUR OR TWO.
   
   ELSEWHERE...WITH A MOIST/MODERATELY UNSTABLE AIRMASS IN PLACE ACROSS
   THIS ENTIRE REGION NEAR AND S OF THE W-E SURFACE FRONT...EXPECT
   UPSTREAM STORM CLUSTERS TO PERSIST AS WELL...CONTINUING THROUGH THE
   EVENING.  ALONG WITH FAVORABLE THERMODYNAMIC ENVIRONMENT...BELT OF
   STRONG W-E FLOW IN THE LOWER AND MIDDLE TROPOSPHERE SUGGESTS AN
   ASSOCIATED THREAT FOR DAMAGING WINDS...HAIL...AND AN ISOLATED
   TORNADO OR TWO WITH THE ONGOING STORMS.
   
   ...THE PLAINS EWD INTO THE MID MO/MID MS VALLEYS...
   VERY MOIST/UNSTABLE AIRMASS IS INDICATED ACROSS THE CENTRAL PLAINS
   AND EWD INTO IL...NEAR AND S OF THE W-E SURFACE BAROCLINIC ZONE. 
   ELY UPSLOPE FLOW N OF THE BOUNDARY IS RESULTING IN STORM DEVELOPMENT
   OVER NERN CO/SERN WY...WITH ADDITIONAL STORM DEVELOPMENT OCCURRING
   EWD INTO SRN AND ERN NEB.  
   
   WITH TIME...EXPECT STORMS TO MOVE OFF THE HIGH TERRAIN AND ACROSS
   THE HIGH PLAINS...WHILE DEVELOPING CONVECTION ACROSS NEB INCREASES
   IN COVERAGE WITH TIME.  OTHER/MORE ISOLATED STORMS MAY DEVELOP SWD
   INTO SWRN KS/WRN OK INVOF THE DRYLINE.  EVENTUALLY...AS A SLY
   LOW-LEVEL JET INCREASES TO NEAR 70 KT THIS EVENING...STORMS SHOULD
   MERGE/EXPAND ACROSS NEB AND PARTS OF KS...AND SPREAD NEWD ACROSS THE
   MID MO VALLEY REGION.  
   
   ALONG WITH FAVORABLY-MOIST/UNSTABLE ENVIRONMENT...STRENGTHENING SLYS
   AT LOW LEVELS BENEATH MID LEVEL SWLYS IN EXCESS OF 50 KT WILL RESULT
   IN SHEAR FAVORABLE FOR SUPERCELLS.  THEREFORE...EXPECT THE SEVERE
   THREAT TO INCREASE THROUGH THE AFTERNOON AND EVENING AS STORMS
   EXPAND IN COVERAGE.  ALONG WITH THE THREAT FOR LARGE HAIL AND
   DAMAGING WINDS...ISOLATED/POTENTIALLY-STRONG TORNADOES WILL BE
   POSSIBLE...GIVEN THE PRESENCE OF THE W-E SURFACE FRONT AND
   INCREASING LOW-LEVEL SHEAR WITH TIME.
   
   ..GOSS.. 06/04/2008
   
   CLICK TO GET WUUS01 PTSDY1 PRODUCT

   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z