Fire Weather Outlook Discussion
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FNUS21 KWNS 240905
FWDDY1

DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0404 AM CDT FRI MAY 24 2013

VALID 241200Z - 251200Z

...CRITICAL FIRE WEATHER AREA FOR FAR SOUTHERN NEVADA...EXTREME
SOUTHERN UTAH...NORTHERN ARIZONA...WEST CENTRAL AND NORTHWEST NEW
MEXICO...AND SOUTHWEST COLORADO...

...SYNOPSIS...
A POTENT SHORTWAVE TROUGH...ROTATING THROUGH THE FLOW SURROUNDING
THE PACIFIC NORTHWEST UPPER LOW...WILL CONTINUE TO LIFT
NORTH/NORTHEAST ACROSS THE NORTHERN ROCKIES TODAY. AHEAD OF THIS
TROUGH...SHORTWAVE RIDING IS EXPECTED TO CONTINUE TO BUILD ACROSS
THE CENTRAL US...WHICH IN TURN SHOULD AID THE DEEPENING OF THE
EASTERN CONUS TROUGH.

ACROSS THE SOUTHWESTERN STATES...A ZONE OF ENHANCED WEST/SOUTHWEST
FLOW SHOULD PERSIST THROUGH MUCH OF TODAY. HERE...DIURNAL HEATING
SHOULD RESULT IN DEEP MIXING OF AN ALREADY DRY BOUNDARY
LAYER...RESULTING IN DAYTIME HIGH TEMPERATURES WARMING INTO THE 80S
AND 90S COUPLED WITH SFC DEWPOINTS FALLING INTO THE SINGLE DIGITS TO
LOW TEENS /YIELDING RELATIVE HUMIDITY VALUES IN THE SINGLE DIGITS TO
LOW TEENS FOR MUCH OF THE AFTERNOON/. FURTHERMORE GIVEN THE STRONG
FLOW ALOFT AND THE DEEP MIXING...STRONG/GUSTY WINDS ARE EXPECTED TO
MIX DOWN TO THE SFC RESULTING IN A PROLONGED PERIOD OF CONDITIONS
EXCEEDING THE CRITICAL THRESHOLD.

...SOUTHERN ARIZONA...
TO THE SOUTH OF THE CRITICAL AREA...MID-LEVEL FLOW IS EXPECTED TO
REMAIN WEAKER THAN FARTHER NORTH. THUS...EVEN THROUGH SFC RH VALUES
WILL EXCEED CRITICAL THRESHOLDS...DIURNAL MIXING WILL ONLY RESULT IN
SUB-CRITICAL THRESHOLD SFC WINDS /15-20 MPH/.

..MARSH.. 05/24/2013

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