388
FNUS21 KWNS 121643
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1142 AM CDT FRI JUN 12 2026
VALID 121700Z - 131200Z
..MORNING UPDATE
POOR OVERNIGHT HUMIDITY RECOVERIES OVER THE EASTERN GREAT BASIN, CO
WEST SLOPE, AND HIGHER ELEVATIONS HAS CONTRIBUTED TO OBSERVED 10-20%
RH VALUES THIS MORNING, WITH SOME LOCALIZED AREAS ALREADY BELOW 10%.
00Z SOUNDINGS FROM YESTERDAY SAMPLED A VERY DEEP, DRY AIRMASS UP TO
6 KM AT GJT AND SLC. ONCE AGAIN, AS DEEP BOUNDARY LAYER MIXING
OCCURS THIS AFTERNOON, CRITICALLY LOW RH AND 10-20 MPH WESTERLY
WINDS (GUSTS OF 25-35 MPH) WILL OVERLAP A REGION OF DRY AND RECENTLY
RECEPTIVE FUELS. LATER THIS EVENING, A SOUTHWARD PROGRESSING COLD
FRONT WILL BRING A WIND SHIFT FROM BROADLY WESTERLY TO
NORTHEASTERLY, POTENTIALLY IMPACTING ANY ONGOING FIRES AND CONTROL
EFFORTS (SUCH AS THE SOUTH FORK FIRE). SOME STRONGER GUSTS OF 25-35
MPH ARE POSSIBLE IMMEDIATELY BEHIND THE FRONT, HOWEVER COOLER
TEMPERATURES AND INCREASING LOW-LEVEL MOISTURE SHOULD PROVIDE SOME
RELIEF TO THE FIRE ENVIRONMENT. SEE THE PREVIOUS DISCUSSION FOR MORE
INFORMATION.
..ELIZALDE-GARCIA.. 06/12/2026
PREV DISCUSSION
/ISSUED 0155 AM CDT FRI JUN 12 2026/
..SYNOPSIS
BETWEEN A BROAD LARGE-SCALE TROUGH ENCOMPASSING THE NORTHERN
ROCKIES/PLAINS AND AN UPPER RIDGE OVER THE SOUTHWEST/SOUTHERN
ROCKIES, A BELT OF ENHANCED WESTERLY FLOW ALOFT WILL PERSIST ACROSS
THE GREAT BASIN AND CENTRAL ROCKIES/ADJACENT HIGH PLAINS THROUGH THE
DAY.
..EASTERN GREAT BASIN INTO THE CENTRAL ROCKIES/PLAINS
DIURNAL HEATING OF A DRY ANTECEDENT AIR MASS (WITH POOR OVERNIGHT
RECOVERIES) WILL RESULT IN DEEP BOUNDARY-LAYER MIXING THIS AFTERNOON
(RH IN THE SINGLY DIGITS TO LOWER/MIDDLE TEENS). WITHIN THE
DEEP/WELL-MIXED BOUNDARY LAYER, EFFICIENT DOWNWARD MOMENTUM
TRANSPORT OF THE ENHANCED FLOW ALOFT WILL YIELD A BROAD AREA OF
15-20 MPH SUSTAINED WESTERLY SURFACE WINDS (LOCALLY HIGHER OVER
TERRAIN-FAVORED AREAS). GIVEN CRITICALLY DRY FUELS ACROSS THE REGION
(90TH-95TH PERCENTILE ERCS), ELEVATED TO LOCALLY CRITICAL
FIRE-WEATHER CONDITIONS ARE EXPECTED.
FARTHER NORTH, STRENGTHENING MIDLEVEL WESTERLY FLOW IN THE BASE OF
THE TROUGH WILL OVERSPREAD A DEEPLY MIXED BOUNDARY LAYER IN THE
SNAKE RIVER PLAIN, RESULTING IN 10-15 PERCENT RH AND 15-20 MPH
SUSTAINED WESTERLY SURFACE WINDS. THESE DRY/BREEZY CONDITIONS ATOP
DRY/RECEPTIVE FUELS WILL PROMOTE ELEVATED FIRE-WEATHER CONDITIONS
DURING THE AFTERNOON.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
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