Fire Weather Outlook Discussion
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FNUS28 KWNS 272039
FWDD38

DAY 3-8 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0338 PM CDT THU AUG 27 2015

VALID 291200Z - 041200Z

THE UPPER TROUGH ALONG THE PACIFIC NORTHWEST COAST ON DAY 3/SATURDAY
WILL LIFT NORTHEAST ACROSS THE NORTHERN ROCKIES...SHIFTING AN UPPER
RIDGE EASTWARD OVER THE PLAINS. AS THIS OCCURS...A SURFACE COLD
FRONT WILL MOVE ACROSS PARTS OF EASTERN WA/ORE...ID AND
WESTERN/CENTRAL MT BY DAY 4/SUNDAY MORNING. WHILE RAINFALL IS
EXPECTED WEST OF THE CASCADES...LITTLE IF ANY WILL ACCOMPANY THE
FRONT FURTHER EAST. ADDITIONALLY...WINDS WILL BE VERY
STRONG...INITIALLY FROM THE SOUTHEAST AND SHIFTING TO THE NORTHWEST
AS THE FRONT PASSES. WHILE RH VALUES WILL BE HIGHER THAN IN RECENT
DAYS...THE STRONG WINDS COULD NEGATIVELY IMPACT ONGOING LARGE FIRES
ACROSS THE REGION. AS SUCH...A LARGE AREA FROM EAST OF THE CASCADES
THROUGH THE GREAT BASIN AND PARTS OF THE CENTRAL AND NORTHERN
ROCKIES HAVE BEEN DELINEATED BY A 40 PERCENT WIND/RH AREA ON DAY
3/SATURDAY.

AS THE UPPER TROUGH PROGRESSES EASTWARD ON SUNDAY AND THE DRY COLD
FRONT CONTINUES SOUTHWARD...BREEZY CONDITIONS WILL PERSIST ACROSS
PARTS OF THE GREAT BASIN AND ROCKIES. FOR THE REST OF THE PERIOD...A
MEAN UPPER TROUGH WILL BE MAINTAINED ACROSS THE NORTHWESTERN STATES
WITH SEVERAL STRONGER SHORTWAVE IMPULSES ROTATING THROUGH THE
NORTHERN ROCKIES.  THIS MAY LEAD TO A PERIOD OF EXTENDED DRY AND
BREEZY CONDITIONS ON THE SOUTHERN FLANK OF THE TROUGH WHERE ENHANCED
SOUTHWESTERLY DEEP LAYER FLOW RESIDES OVER THE GREAT BASIN INTO THE
CENTRAL ROCKIES AND ADJACENT HIGH PLAINS. AT THIS TIME...IT APPEARS
ANOTHER DRY COLD FRONTAL PASSAGE ASSOCIATED WITH ONE OF THE
SHORTWAVE IMPULSES EJECTING ACROSS THE NORTHERN INTERMOUNTAIN REGION
COULD DEVELOP SOUTHWARD ACROSS THE GREAT BASIN ON DAY
7/WED...RESULTING IN ELEVATED FIRE WEATHER CONCERNS.

..LEITMAN.. 08/27/2015

...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...



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