556
FNUS21 KWNS 201547
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1046 AM CDT FRI MAR 20 2026
VALID 201700Z - 211200Z
..CRITICAL FIRE WEATHER AREA FOR PORTIONS OF EASTERN WYOMING
VISIBLE SATELLITE DATA DEPICTS CLEAR SKIES, WITH BOUNDARY-LAYER
WARMING UNDERWAY. SURFACE OBSERVATIONS SHOW TEMPERATURES REACHING
THE 60S F IN SPOTS, WITH RH DIPPING TO 20 PERCENT, AND WESTERLY
SURFACE WINDS APPROACHING 20 MPH AMID 25 MPH GUSTS. GUIDANCE
CONSENSUS SUGGESTS THAT BOUNDARY-LAYER MIXING WILL CONTINUE INTO THE
AFTERNOON HOURS, RESULTING IN OVERLAPPING WIDESPREAD 15-20 PERCENT
RH AND 15-20 MPH SUSTAINED WESTERLY SURFACE WINDS. AS SUCH, THE
CURRENT ELEVATED AND CRITICAL HIGHLIGHTS ACROSS THE NORTHERN HIGH
PLAINS INTO THE NORTHERN ROCKIES HAVE BEEN MAINTAINED.
..SQUITIERI.. 03/20/2026
PREV DISCUSSION
/ISSUED 0115 AM CDT FRI MAR 20 2026/
..SYNOPSIS
A PERSISTENT UPPER-LEVEL RIDGE WILL REMAIN CENTERED OVER THE
SOUTHWEST TODAY WITH MODEST NORTHWEST FLOW ALOFT ACROSS THE
CENTRAL/NORTHERN HIGH PLAINS. SURFACE HIGH PRESSURE OVER THE
INTERMOUNTAIN WEST COUPLED WITH LEE TROUGHING ACROSS THE NORTHERN
GREAT PLAINS WILL CONTINUE TO FAVOR A DOWNSLOPE WIND REGIME, WITH
DRY AND WINDY CONDITIONS FORECAST TO SUPPORT ELEVATED TO CRITICAL
FIRE WEATHER CONCERNS ACROSS PORTIONS OF THE CENTRAL AND NORTHERN
HIGH PLAINS.
..CENTRAL/NORTHERN HIGH PLAINS
RECORD WARM TEMPERATURES CONTINUE ACROSS MUCH OF THE WEST AMID AN
ANOMALOUSLY STRONG UPPER-LEVEL RIDGE CENTERED ACROSS THE SOUTHWEST.
WITH HIGH PRESSURE REMAINING IN PLACE ACROSS THE INTERMOUNTAIN WEST
AND LEE TROUGHING ACROSS THE NORTHERN GREAT PLAINS, A CONTINUING
DOWNSLOPE WIND REGIME IS FORECAST TO YIELD SUSTAINED
WEST-NORTHWESTERLY SURFACE WINDS OF 20-25 MPH ACROSS PORTIONS OF
CENTRAL/EASTERN WYOMING. POOR OVERNIGHT RH RECOVERIES HAVE BEEN
NOTED VIA RECENT SURFACE OBSERVATIONS WITH FURTHER RH REDUCTIONS TO
10-20% FORECAST THIS AFTERNOON. COUPLED WITH RECEPTIVE FUELS, THIS
IS EXPECTED TO SUPPORT CRITICAL FIRE WEATHER CONDITIONS ACROSS
CENTRAL/EASTERN WYOMING TODAY. ELEVATED FIRE WEATHER CONCERNS ARE
ALSO FORECAST ACROSS ADJACENT AREAS OF THE WESTERN WYOMING BASIN AND
PORTIONS OF SOUTHWESTERN SOUTH DAKOTA AND WESTERN NEBRASKA WHERE
SURFACE WINDS OF 15-20 MPH ARE EXPECTED TO OVERLAP MINIMUM RH VALUES
OF 10-20%.
FUELS REMAIN MORE MARGINAL FARTHER TO THE NORTH ACROSS MUCH OF
SOUTHERN MONTANA AND PORTIONS OF EXTREME SOUTHWESTERN NORTH DAKOTA
AND NORTHWESTERN SOUTH DAKOTA; HOWEVER, CONTINUED WARM/DRY
CONDITIONS HAVE SUPPORTED SOME DRYING OF FINE FUELS ALONG WITH
RECENT FIRE ACTIVITY. GIVEN THIS, ELEVATED FIRE WEATHER CONDITIONS
ARE EXPECTED THIS AFTERNOON AS RH VALUES ARE FORECAST TO RANGE FROM
15-25% AMID STRONGER SUSTAINED WESTERLY WINDS OF 15-25 MPH. 40+
KNOTS OF 700 MB FLOW ACROSS THIS REGION COUPLED WITH DEEP BOUNDARY
LAYER MIXING MAY ALSO SUPPORT OCCASIONAL WIND GUSTS OF 30-40 MPH.
..CENTRAL NEVADA INTO SOUTHERN OREGON
GUIDANCE CONTINUES TO INDICATE LOCALIZED POTENTIAL FOR SUSTAINED
SOUTHWESTERLY SURFACE WINDS OF 10-15 MPH THIS AFTERNOON AS THE
SURFACE PRESSURE GRADIENT TIGHTENS AHEAD OF AN APPROACHING COLD
FRONT. WITH RH VALUES FORECAST TO FALL TO 10-15%, LOCALIZED ELEVATED
FIRE WEATHER CONCERNS MAY MATERIALIZE ACROSS PORTIONS OF SOUTHERN
OREGON INTO CENTRAL NEVADA, ESPECIALLY IN AREAS THAT FAVOR
TERRAIN-INDUCED WIND ENHANCEMENTS. HOWEVER, WIDESPREAD ELEVATED
CONDITIONS ARE NOT EXPECTED AT THIS TIME GIVEN MARGINAL EARLY SEASON
FUEL CONDITIONS AND SPORADIC COVERAGE OF COINCIDENT ELEVATED WIND/RH
CRITERIA.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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