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URGENT - FIRE WEATHER MESSAGE...UPDATED NATIONAL WEATHER SERVICE PORTLAND OR 210 PM PDT SUN AUG 10 2014 ...CRITICAL FIRE WEATHER CONDITIONS THROUGH EARLY TUESDAY DUE TO HEAT...INSTABILITY...AND THUNDERSTORMS... HOT WEATHER HAS DEVELOPED TODAY ACROSS MUCH OF OREGON AND SOUTHERN WASHINGTON...CAUSING A BROAD THERMAL TROUGH OF LOW PRESSURE TO DEVELOP ACROSS THE REGION. THIS IS RESULTING IN VERY DRY AND UNSTABLE MID-LEVEL HAINES 6 CONDITIONS WHICH WILL PERSIST INTO MONDAY. HUMIDITY RECOVERIES TONIGHT WILL LIKELY BE POOR ABOVE THE THERMAL BELTS. MEANWHILE...A CLOSED UPPER LEVEL LOW PRESSURE SYSTEM OFF THE NORTHERN CALIFORNIA COAST WILL DRIFT NORTHWARD... INCREASING THE THREAT OF THUNDERSTORMS FROM SOUTH TO NORTH TONIGHT THROUGH MONDAY NIGHT. THERE MAY BE SEVERAL ROUNDS OF THUNDERSTORMS DURING THIS PERIOD...WITH THUNDERSTORMS TENDING TO BE DRY AND GUSTY TO START...THEN BECOMING WETTER LATER MONDAY INTO TUESDAY. WITH LOW RELATIVE HUMIDITY EXPECTED AND DRY FUELS IN PLACE...THERE IS HIGH POTENTIAL FOR LIGHTNING STRIKES TO GENERATE SEVERAL NEW FIRES WHICH MAY OVERWHELM INITIAL ATTACK. ...RED FLAG WARNING IN EFFECT UNTIL 11 AM PDT TUESDAY FOR HOT...DRY...UNSTABLE HAINES 6 CONDITIONS FOLLOWED BY ABUNDANT LIGHTNING FOR FIRE WEATHER ZONES 601...602...AND 612. THE NATIONAL WEATHER SERVICE IN PORTLAND HAS ISSUED A RED FLAG WARNING FOR HOT...DRY...UNSTABLE HAINES 6 CONDITIONS FOLLOWED BY ABUNDANT LIGHTNING...WHICH IS IN EFFECT UNTIL 11 AM PDT TUESDAY. * AFFECTED AREA...FIRE WEATHER ZONES 601...602...AND 612 AWAY FROM THE IMMEDIATE COASTLINE. * RELATIVE HUMIDITY...AS LOW AS 20 PERCENT INLAND RIDGES...WITH POOR OVERNIGHT RECOVERIES ABOVE THERMAL BELTS. * INSTABILITY...MID-LEVEL HAINES 6 CONDITIONS. * THUNDERSTORMS...INCREASING CHANCE FOR THUNDERSTORMS TONIGHT THROUGH MONDAY...SOME OF WHICH WILL PRODUCE ABUNDANT LIGHTNING AND GUSTY OUTFLOW WINDS UP TO 40 MPH. * IMPACTS...SOME OF THE INITIAL THUNDERSTORMS WILL PRODUCE LITTLE TO NO RAINFALL ALONG WITH FREQUENT LIGHTNING. WITH FAIRLY DRY FUELS IN PLACE...THIS MAY SET THE STAGE FOR NUMEROUS FIRE STARTS THAT HAVE THE POTENTIAL TO OVERWHELM INITIAL ATTACK RESOURCES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. PLEASE ADVISE THE APPROPRIATE OFFICIALS OR FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING.