DAY 2 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 1133 PM CST WED FEB 17 2016 VALID 191200Z - 201200Z ...NO SVR TSTM AREAS FORECAST... ...SUMMARY... ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS PORTIONS OF THE PACIFIC NORTHWEST COAST ON FRIDAY. ...SYNOPSIS... A PROGRESSIVE NORTHERN STREAM UPPER LEVEL PATTERN WILL CONTINUE ON FRIDAY. A SHORTWAVE TROUGH OVER THE UPPER MIDWEST WILL SHIFT EASTWARD ACROSS THE GREAT LAKES TOWARD THE NORTHEASTERN U.S. STEEP MIDLEVEL LAPSE RATES COUPLED WITH COLD TEMPERATURES ALOFT COULD LEAD TO A LIGHTNING STRIKE OR TWO ACROSS WI OR THE ARROWHEAD OF NORTHEAST MN. HOWEVER...MEAGER INSTABILITY AND A SURFACE COLD FRONT PUSHING THROUGH THE REGION BY 18Z WILL KEEP ANY THUNDERSTORMS SPORADIC AT BEST. ACROSS THE WEST...A SHORTWAVE UPPER TROUGH WILL MOVE ONSHORE THE PACIFIC NW COAST BY MIDDAY AND SHIFT EAST OVER THE NORTHERN ROCKIES OVERNIGHT. AS THE UPPER TROUGH MOVES ONSHORE...STEEP MIDLEVEL LAPSE RATES AND STRONG FORCING FOR ASCENT WILL COMBINE WITH MOIST UPSLOPE FLOW AND ADEQUATE INSTABILITY FOR ISOLATED THUNDERSTORM DEVELOPMENT FROM THE SOUTHWEST WA COAST SOUTHWARD THROUGH THE FAR NORTHERN CA COAST. GIVEN THE STRENGTH OF DEEP LAYER FLOW...SOME GUSTY WINDS ARE POSSIBLE BUT SEVERE THUNDERSTORMS ARE NOT EXPECTED. ..LEITMAN.. 02/18/2016Read more
from SPC Forecast Products http://ift.tt/sd6f6z
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