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Mesoscale Discussion 1844
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   MESOSCALE DISCUSSION 1844
   NWS STORM PREDICTION CENTER NORMAN OK
   0913 PM CDT THU SEP 05 2013

   AREAS AFFECTED...NORTH-CENTRAL ORE/EASTERN WA AND WESTERN/NORTHERN
   ID TO WESTERN MT

   CONCERNING...SEVERE THUNDERSTORM WATCH 511...513...

   VALID 060213Z - 060415Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   511...513...CONTINUES.

   SUMMARY...CLUSTERS OF STRONG/SEVERE TSTMS CAPABLE OF WIND/HAIL WILL
   CONTINUE TO DEVELOP NORTH-NORTHEASTWARD ACROSS SOUTH-CENTRAL/EASTERN
   WA ALONG WITH NORTHERN ID AND SOUTHWEST/WEST-CENTRAL MT. RECENTLY
   ISSUED SEVERE TSTM WATCH 513 CONTINUES UNTIL 08Z...WHILE SEVERE TSTM
   WATCH 511 WILL LIKELY BE ALLOWED TO EXPIRE AT/BY 03Z.

   DISCUSSION...AGGREGATING OUTFLOWS/COLD POOLS ASIDE...FOCUSED ASCENT
   WITH DPVA AND WARM/MOIST ADVECTION APPEARS TO BE INSTRUMENTAL IN THE
   SUSTENANCE OF MULTIPLE NORTH-NORTHEASTWARD MOVING TSTM CLUSTERS
   ACROSS SOUTHERN WA AND NORTH-CENTRAL ID/SOUTHWEST MT AS OF 02Z.
   MAINLY ACROSS SEVERE TSTM WATCH 513...BOUTS OF STRONG/POTENTIALLY
   SEVERE WINDS WILL REMAIN A DISTINCT POSSIBILITY ESPECIALLY ACROSS
   AREAS SUCH SOUTH-CENTRAL/SOUTHEAST WA...AS WELL AS SOUTHWEST MT THIS
   EVENING. ALTHOUGH THE BOUNDARY LAYER HAS BEGUN TO COOL IN MOST
   AREAS...RESIDUAL WARMTH/MODERATE INSTABILITY AND STRENGTHENING DEEP
   TROPOSPHERIC WINDS WILL REMAIN CONDUCIVE FOR STRONG DOWNDRAFTS TO
   REACH THE SURFACE OVER THE NEXT SEVERAL HOURS...ASIDE FROM ISOLATED
   BOUTS OF HAIL. OWING TO NORTHEAST-SHIFTING FORCING FOR ASCENT AND
   PRIOR CONVECTIVE OVERTURNING/OUTFLOWS...EXPECTATIONS ARE FOR A
   CONTINUED WANE OF THE SEVERE THREAT WITHIN SEVERE TSTM WATCH
   511...SUCH THAT IT WILL LIKELY BE ALLOWED TO EXPIRE AT/BY 03Z.

   ..GUYER.. 09/06/2013


   ATTN...WFO...TFX...MSO...BOI...OTX...PDT...SEW...

   LAT...LON   46482156 48162090 48741817 48111411 46811163 46011109
               45701207 45701467 44341583 45541987 46482156 

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