Fire Weather Outlook Discussion
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FNUS22 KWNS 191629
FWDDY2

DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1129 AM CDT FRI SEP 19 2014

VALID 201200Z - 211200Z

...ALONG AND AROUND THE ORE/WA BORDER...
SURFACE HIGH PRESSURE OVER THE NRN ROCKIES AND WRN PORTIONS OF THE
NRN PLAINS WILL TRANSITION EWD WHILE AN INVERTED TROUGH OFF THE ORE
COAST STRENGTHENS. AS A RESULT...DESPITE THE HIGHS EWD
MOVEMENT...SURFACE PRESSURE GRADIENT IS EXPECTED TO REMAIN STRONG
ENOUGH TO SUPPORT ENHANCED OFFSHORE WINDS THROUGHOUT THE PERIOD.
THESE OFFSHORE WINDS WILL ALSO SUPPORT TEMPERATURES FROM 7 TO 10
DEGREES ABOVE NORMAL AND MIN RH VALUES AROUND 25 TO 30 PERCENT.
CURRENT GUIDANCE INDICATES MOSTLY ISOLATED ELEVATED FIRE WEATHER
CONDITIONS BUT GIVEN MODEL TENDENCIES TO UNDERESTIMATE WIND SPEEDS
AND DOWNSLOPE EFFECTS FELT IT WAS PRUDENT TO DELINEATE AN ELEVATED
AREA WITH THIS FORECAST.

..MOSIER.. 09/19/2014

.PREV DISCUSSION... /ISSUED 0500 AM CDT FRI SEP 19 2014/

...SYNOPSIS...
THE MID-LEVEL FLOW PATTERN WILL CONTINUE TO AMPLIFY THROUGHOUT THE
PERIOD AS A RIDGE BUILDS ACROSS WESTERN CANADA AND A TROUGH
CONTINUES TO DEEPEN ACROSS THE CENTRAL/EASTERN UNITED STATES. AT THE
SURFACE...HIGH PRESSURE WILL OVERSPREAD THE NORTHERN PLAINS IN THE
WAKE OF A SURFACE COLD FRONT ASSOCIATED WITH THE DIGGING MID-LEVEL
TROUGH.

AS THE AFOREMENTIONED SURFACE HIGH BUILDS INTO THE UNITED STATES...A
WEAK TROUGH/LOW SHOULD BE MAINTAINED OFF THE COAST OF NORTHERN
CALIFORNIA AND OREGON. THIS WILL RESULT IN AN INCREASING
SURFACE-PRESSURE GRADIENT ACROSS SOUTHERN PORTIONS OF THE PACIFIC
NORTHWEST. THIS INCREASING SURFACE-PRESSURE GRADIENT WILL RESULT IN
BREEZY OFFSHORE FLOW. AT THIS TIME...RELATIVE-HUMIDITY VALUES SHOULD
REMAIN HIGH ENOUGH TO PRECLUDE LARGE-SCALE FIRE WEATHER CONCERNS.
HOWEVER...AN ELEVATED AREA COULD BECOME NECESSARY SHOULD LOWER
RELATIVE-HUMIDITY VALUES BECOME EXPECTED.

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




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