652
FNUS21 KWNS 271641
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1140 AM CDT FRI JUN 27 2025
VALID 271700Z - 281200Z
NO MARKED CHANGES FOR THE DAY 1 OUTLOOK UPDATE AS PREVIOUS FORECAST
(SEE BELOW) REMAINS ON TRACK. CURRENT SATELLITE AND UPPER-AIR
OBSERVATIONS INDICATE BROAD WESTERLY FLOW ACROSS THE NORTHWEST AND
NORTH-CENTRAL CONUS AS A LOW-AMPLITUDE MID-LEVEL TROUGH ENTERS THE
PACIFIC NORTHWEST. A DEEPENING LEE TROUGH AROUND THE BLACK
HILLS/BADLANDS REGION ALONG WITH INCREASED WESTERLY MID-LEVEL FLOW
WILL SUPPORT BREEZY WEST WINDS ACROSS MUCH OF SOUTHWEST WY THIS
AFTERNOON AMID DRY FUELS AND LOW RELATIVE HUMIDITY. SIMILARLY,
ACCELERATING VALLEY WESTERLY WINDS IN THE SNAKE RIVER PLAIN ARE
EXPECTED TODAY AS THE MID-LEVEL TROUGH AND ASSOCIATED WIND MAXIMA
MOVE THROUGH THE NORTHERN ROCKIES SUPPORTING ELEVATED FIRE WEATHER
CONDITIONS AMID DRY FUELS AND LOW RELATIVE HUMIDITY.
..WILLIAMS.. 06/27/2025
PREV DISCUSSION
/ISSUED 0134 AM CDT FRI JUN 27 2025/
..SYNOPSIS
SUB-TROPICAL HIGH PRESSURE IS FORECAST TO INTENSIFY ACROSS MUCH OF
THE SOUTHERN US AS FLOW ALOFT LIFTS TO THE NORTH. ACROSS THE
NORTHERN EDGE OF THE BUILDING HIGH, A LOW-AMPLITUDE MIDLEVEL TROUGH
WITH EMBEDDED SPEED MAXIMA WILL MOVE EASTWARD FROM THE NORTHERN
ROCKIES TO THE NORTHERN HIGH PLAINS THROUGH TONIGHT. AT THE
SURFACE, LEE CYCLOGENESIS IS EXPECTED THIS AFTERNOON IN THE VICINITY
OF NORTHEAST WY, WITH A WEAK LEE TROUGH EXTENDING SOUTH ACROSS THE
HIGH PLAINS. INCREASING WESTERLY FLOW ALOFT AND WARM TEMPERATURES
SUGGEST INCREASED FIRE-WEATHER CONCERNS ARE LIKELY.
..SOUTHWEST WY AND CENTRAL ID
MODERATE WESTERLY FLOW AT THE BASE OF THE UPPER TROUGH WILL BEGIN TO
OVERSPREAD ID AND SOUTHWEST WY EARLY TODAY AS LEE TROUGHING DEVELOPS
TO THE EAST. DRY DOWNSLOPE WINDS ARE EXPECTED ACROSS SOUTHWEST WY
WITH SURFACE WINDS TO NEAR 20 MPH. DEEP MIXING WILL ALSO PROMOTE
FREQUENT GUSTS TO 25-30 MPH, AS RH VALUES FALL INTO THE TEENS THIS
AFTERNOON. SEVERAL HOURS OF ELEVATED CONDITIONS APPEAR LIKELY,
COINCIDENT WITH DRY FUELS AND ONGOING DROUGHT.
FARTHER WEST, SLIGHTLY WEAKER SURFACE FLOW SHOULD DEVELOP THROUGH
THE EASTERN SNAKE RIVER PLAIN AND CENTRAL ID. DEEP MIXING AND THE
APPROACH OF THE UPPER TROUGH WILL PROMOTE SURFACE GUSTS OF 15-20
MPH, ALONG WITH RELATIVE HUMIDITY BELOW 20%. THIS COULD SUPPORT A
FEW HOURS OF ELEVATED FIRE-WEATHER CONDITIONS AMID DRYING FUELS.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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