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SPC Wildfire Outlook for September 20, 2014

Fire Outlook

Day 1 SPC Wild Fire Monitored Area Discussion

610 
FNUS21 KWNS 201632
FWDDY1

DAY 1 FIRE WEATHER OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1132 AM CDT SAT SEP 20 2014

VALID 201700Z - 211200Z

NO CHANGES.

..BOTHWELL.. 09/20/2014

.PREV DISCUSSION... /ISSUED 0352 AM CDT SAT SEP 20 2014/

...SYNOPSIS...
MID-LEVEL FLOW ACROSS NORTH AMERICA WILL CONTINUE TO AMPLIFY AS A
RIDGE BUILDS ACROSS WESTERN CANADA AND A TROUGH DIGS INTO THE
NORTH-CENTRAL UNITED STATES. AT THE SURFACE...HIGH PRESSURE WILL
BUILD SOUTHEASTWARD /ALONG THE LEE OF THE ROCKIES/ IN THE WAKE OF A
SURFACE COLD FRONT.

ACROSS THE PACIFIC NORTHWEST...A WEAK TROUGH WILL DEVELOP/STRENGTHEN
NORTHWARD ALONG THE OREGON/WASHINGTON COASTS AS THE AFOREMENTIONED
SURFACE HIGH PRESSURE BUILDS SOUTHEASTWARD. GIVEN THE FAVORABLE
SURFACE PRESSURE CONFIGURATION...OFFSHORE/DOWNSLOPE FLOW IS EXPECTED
TO DEVELOP ACROSS NORTHERN OREGON AND SOUTHERN WASHINGTON. ALTHOUGH
MESOSCALE-MODEL GUIDANCE CONTINUES TO SUGGEST SURFACE WINDS WILL
REMAIN BELOW 15 KNOTS AND RELATIVE-HUMIDITY VALUES WILL REMAIN AT OR
ABOVE 20 PERCENT...THE LARGE-SCALE PRESSURE FIELD SUGGESTS THAT
LOWER RELATIVE-HUMIDITY VALUES AND SLIGHTLY STRONGER SURFACE-WIND
SPEEDS WILL BE POSSIBLE ON AT LEAST A LOCAL BASIS. THIS...COUPLED
WITH ABOVE-NORMAL TEMPERATURES OWING TO DOWNSLOPE WARMING...SUPPORTS
ELEVATED FIRE-WEATHER DELINEATION ALONG THE OREGON AND WASHINGTON
BORDERS.

ELSEWHERE...LARGE-SCALE FIRE-WEATHER CONCERNS ARE NOT ANTICIPATED.

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