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Last Updated: 3:29 PM GMT on August 26, 2012
— Last Comment: 8:37 PM GMT on August 28, 2012
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 MESOSCALE DISCUSSION 1797 NWS STORM PREDICTION CENTER NORMAN OK 0345 PM CDT TUE AUG 21 2012 AREAS AFFECTED...NORTHERN ID/WESTERN MT CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 212045Z - 212245Z PROBABILITY OF WATCH ISSUANCE...20 PERCENT SUMMARY...ISOLATED DAMAGING WIND AND POSSIBLY SOME SEVERE HAIL POTENTIAL WILL EXIST LATE THIS AFTERNOON/EARLY EVENING FROM PORTIONS OF NORTHERN ID INTO WESTERN MT. DISCUSSION...VISIBLE SATELLITE IMAGERY IS INDICATIVE OF AN INCREASING/DEEPENING CU FIELD...ALONG WITH A FEW ISOLATED TSTMS AS OF 2030Z...ESPECIALLY OVER THE MOUNTAINS/HIGHER TERRAIN OF NORTHERN ID INTO SOUTHWEST MT. IN THE WAKE OF AN INITIAL MID-LEVEL IMPULSE MOVING INTO SOUTHERN ALBERTA...A MORE SUBSTANTIAL TROUGH OVER THE PACIFIC NORTHWEST IS BEGINNING TO INFLUENCE THE REGION PER WATER VAPOR IMAGERY. AS THE BOUNDARY LAYER CONTINUES TO WARM IN THE SHORT-TERM...THE AFOREMENTIONED SCENARIO SHOULD OTHERWISE ENCOURAGE ADDITIONAL TSTM DEVELOPMENT OVER THE NEXT FEW HOURS FROM NORTHERN ID INTO WESTERN MT. THE WELL-MIXED NATURE OF THE BOUNDARY LAYER /30-45 F SFC TEMP-DEWPOINT SPREADS/ AND ASSOCIATED DOWNDRAFT POTENTIAL WILL ACCOUNT FOR THE POSSIBILITY OF ISOLATED DAMAGING WINDS AS FORCING FOR ASCENT/SOUTHWESTERLY WINDS ALOFT CONTINUE TO MARKEDLY INCREASE...A TREND ALREADY NOTED IN REGIONAL WSR-88D VWP DATA. SOME HAIL MAY BE POSSIBLE AS WELL. ..GUYER/MEAD.. 08/21/2012 ATTN...WFO...BYZ...TFX...PIH...MSO...BOI...OTX... LAT...LON 45761576 48141578 48041290 46141061 44111343 45761576
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