SPC AC 090730

   DAY 3 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0230 AM CDT FRI AUG 09 2013

   VALID 111200Z - 121200Z

   ...NO SVR TSTM AREAS FORECAST...

   ...SYNOPSIS...
   THE LARGE SCALE PATTERN WILL REMAIN RELATIVELY AMPLIFIED OVER THE
   CONUS THROUGH SUNDAY. AN UPPER LOW WILL CONTINUE TO MOVE GENERALLY
   NORTHWARD ALONG THE PACIFIC NORTHWEST COAST...WHILE UPPER TROUGH
   AMPLIFICATION OCCURS OVER THE GREAT LAKES.

   ...CENTRAL PLAINS...
   MODESTLY STRONG NORTHWESTERLY FLOW WILL EXIST OVER MUCH OF THE
   PLAINS TO THE EAST OF THE ROCKIES UPPER RIDGE. POTENTIAL FOR EARLY
   DAY/ONGOING SHOWERS AND TSTMS ASIDE...THE PRIMARY FOCUS WILL BE ON
   AFTERNOON/EARLY EVENING DEVELOPMENT ALONG/IMMEDIATELY NORTH OF A
   CENTRAL HIGH PLAINS SURFACE LOW AND ANGLING FRONTAL ZONE.
   NEAR-FRONTAL FORCING...UPSLOPE TRAJECTORIES...AND MODERATE
   INSTABILITY WILL CONTRIBUTE TO THE DEVELOPMENT OF STRONG/SEVERE
   TSTMS SUNDAY AFTERNOON...WITH SUFFICIENT SHEAR ACROSS PORTIONS OF
   THE REGION FOR SUSTAINED MULTICELLS AND A FEW SUPERCELLS. SEVERE
   HAIL/WIND WOULD BE THE PRIMARY HAZARDS. IT IS POSSIBLE THAT PORTIONS
   OF WEST-CENTRAL NEB/KS MAY NECESSITATE A SLIGHT RISK IN SUBSEQUENT
   OUTLOOKS.

   ...PACIFIC NORTHWEST/NORTHERN ROCKIES...
   IN ASSOCIATION WITH THE NEAR-COASTAL/NORTHWARD-MOVING UPPER
   LOW...FORCING FOR ASCENT AND COOL TEMPERATURES ALOFT/STRONGER
   MID-LEVEL WESTERLIES WILL CONTINUE TO OVERSPREAD EAST-CENTRAL
   PORTIONS OF ORE/WA INTO NORTHERN ID ON SUNDAY. PENDING
   TIMING/DESTABILIZATION DETAILS...AT LEAST A FEW STRONG/POTENTIALLY
   SEVERE TSTMS WILL BE POSSIBLE IN AREAS SUCH AS EASTERN WA/FAR
   NORTHEAST ORE INTO FAR NORTHERN ID/NORTHWEST MT...WITH HAIL/WIND
   POSSIBLE. ADDITIONALLY...OTHER MORE ISOLATED TSTMS...A FEW POSSIBLY
   SEVERE...MAY ALSO DEVELOP INTO ADDITIONAL PARTS OF CENTRAL/SOUTHEAST
   MT WITHIN THE MOIST/INSTABILITY AXIS FOCUSED NEAR/NORTHEAST OF THE
   MOUNTAINS.

   ...TN VALLEY TO CAROLINAS...
   WEAK HEIGHT FALLS ARE EXPECTED OVER THE REGION ON THE SOUTHERN
   FRINGES OF STRONGER CYCLONIC WESTERLIES ALOFT. WHILE THE EXACT
   DEGREE/SPATIAL LOCATIONS OF STRONGER DESTABILIZATION ARE UNCERTAIN
   AT THIS JUNCTURE...AT LEAST A FEW STRONGER/POTENTIALLY SEVERE TSTMS
   WILL AGAIN BE POSSIBLE WITHIN A MOIST/MODESTLY UNSTABLE ENVIRONMENT
   ALONG/SOUTH OF A PERSISTENT SLOW SOUTHWARD-SHIFTING EFFECTIVE
   FRONTAL ZONE. DOWNBURSTS CAPABLE OF LOCALIZED WIND DAMAGE MAY BE
   SPORADICALLY POSSIBLE SUNDAY AFTERNOON.

   ..GUYER.. 08/09/2013

   CLICK TO GET WUUS03 PTSDY3 PRODUCT

   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0730Z