Fire Weather Outlook Discussion
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FNUS22 KWNS 290833
FWDDY2

DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0332 AM CDT SAT AUG 29 2015

VALID 301200Z - 311200Z

...SYNOPSIS...
AN UPPER TROUGH OVER THE PACIFIC NORTHWEST AND WRN CANADIAN
PROVINCES AT THE BEGINNING OF THE D2/SUN PERIOD WILL MOVE EWD SUN
AFTERNOON AND EVENING...LIKELY REACHING THE NRN HIGH PLAINS AND
SASKATCHEWAN/MANITOBA BY EARLY MON MORNING. DOWNSTREAM RIDGING WILL
ALSO MOVE EWD FROM THE NRN PLAINS TO THE GREAT LAKES REGION/ONTARIO
THROUGH THE PERIOD...WHILE ANOTHER AREA OF UPPER RIDGING OVER THE
DESERT SOUTHWEST BECOMES SUPPRESSED WITH THE TROUGH PASSING TO THE
N. AT THE SFC...AN AREA OF LOW PRESSURE WITH TRAILING COLD FRONT
ASSOCIATED WITH THE UPPER TROUGH DESCRIBED ABOVE WILL ALSO MOVE EWD
OVER THE SAME GENERAL REGION.

...PORTIONS OF THE NRN/CNTRL ROCKIES...NRN/CNTRL HIGH PLAINS...AND
GREAT BASIN...
BEHIND THE SFC COLD FRONT MENTIONED ABOVE...STRONG/GUSTY DOWNSLOPE
WINDS WILL LIKELY OCCUR SUN AFTERNOON ACROSS PORTIONS OF THE NRN
ROCKIES AND ADJACENT NRN HIGH PLAINS IN ASSOCIATION WITH ENHANCED
SWLY MID-LEVEL FLOW MOVING OVER THE REGION. WHILE SFC TEMPERATURES
MAY INITIALLY BE COOL IN THE MORNING WITH FRONTAL PASSAGE...
DOWNSLOPE WARMING/DRYING OF THE BOUNDARY LAYER SHOULD LOWER RH
VALUES TO 20-25 PERCENT FOR SEVERAL HOURS IN THE AFTERNOON. THE
CURRENT FORECAST COMBINATION OF WIND/RH VALUES SUPPORTS AN ELEVATED
DESIGNATION FOR PORTIONS OF CNTRL/SWRN MT...ERN ID...AND FAR NWRN
WY...WITH LOCALLY CRITICAL CONDITIONS POSSIBLE.

FURTHER S ACROSS PORTIONS OF THE GREAT BASIN...NWRN CO...AND MUCH OF
WY...MID-LEVEL FLOW SHOULD BE GENERALLY WEAKER ON D2/SUN...
AROUND 20-40 KT. REGARDLESS...AS DIURNAL MIXING OF THE BOUNDARY
LAYER COMBINES WITH DAYTIME HEATING...SOME OF THESE WINDS ALOFT MAY
BE PROMOTED TO THE SFC...AND AREAS OF STRONG/GUSTY WINDS MAY ALIGN
WITH RH VALUES APPROACHING CRITICAL LEVELS FOR SEVERAL HOURS SUN
AFTERNOON. THIS SCENARIO SUPPORTS A SEPARATE ELEVATED AREA ACROSS
THIS REGION. AT THIS TIME...RH VALUES FORECAST TO GENERALLY REMAIN
ABOVE 15 PERCENT PRECLUDES THE INTRODUCTION OF A CRITICAL AREA.

FURTHER E ACROSS PORTIONS OF THE NRN/CNTRL PLAINS...SLY LOW-LEVEL
FLOW SHOULD INCREASE AHEAD OF THE SFC LOW AND COLD FRONT APPROACHING
FROM THE W. LOWERED RH VALUES NEAR/BELOW CRITICAL LEVELS COMBINED
WITH THE STRONG FORECAST WINDS WOULD NORMALLY SUPPORT AT LEAST A
ELEVATED FIRE WEATHER AREA...BUT GENERALLY UNRECEPTIVE FUELS ACROSS
THIS REGION SHOULD LIMIT THE FIRE WEATHER THREAT...AND THEREFORE NO
ELEVATED AREA HAS BEEN DELINEATED.

..GLEASON.. 08/29/2015

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



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