319
FNUS21 KWNS 011644
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1143 AM CDT FRI AUG 01 2025
VALID 011700Z - 021200Z
HOT, VERY DRY (MINIMUM RH VALUES LESS THAN 10%), AND BREEZY
(SUSTAINED SURFACE WINDS OF 15-20 MPH) CONDITIONS ARE EXPECTED TODAY
ACROSS MUCH OF THE CENTRAL/SOUTHERN GREAT BASIN AND NEIGHBORING
PORTIONS OF NORTHWEST COLORADO AND SOUTHWEST WYOMING. AS OF 16Z,
OBSERVATIONS ACROSS THIS AREA SUGGEST LOCALLY ELEVATED CONDITIONS
ALREADY ONGOING WITH CRITICAL RH VALUES PRESENT. WIDESPREAD ELEVATED
CONDITIONS ARE EXPECTED FROM MIDDAY THROUGH THIS EVENING AS WINDS
STRENGTHEN AND RH VALUES FALL EVEN FURTHER. THE ELEVATED FIRE
WEATHER AREA WAS EXPANDED ACROSS THIS REGION BASED ON THE LATEST
HIGH-RESOLUTION ENSEMBLE GUIDANCE.
ELEVATED FIRE WEATHER CONDITIONS ARE ALSO LIKELY ACROSS WIND-PRONE
PORTIONS OF THE SNAKE RIVER PLAIN IN IDAHO, WHERE SEVERAL HOURS OF
SUSTAINED WINDS OF 15-20 MPH (WITH GREATER GUSTS) AND MINIMUM RH
VALUES NEAR 15% ARE EXPECTED THIS AFTERNOON/EVENING.
LOCALLY CRITICAL FIRE WEATHER CONDITIONS ARE MOST LIKELY ACROSS
PORTIONS OF SOUTHWEST UTAH, NORTHWEST COLORADO INTO SOUTHWEST
WYOMING, AND ALSO THE SNAKE RIVER PLAIN. THOUGH, COVERAGE IS
FORECAST TO BE TOO SPOTTY/BRIEF TO UPGRADE TO CRITICAL ACROSS THESE
AREAS.
THE FORECAST FOR ISOLATED DRY THUNDERSTORMS OVER PORTIONS OF THE
NORTHERN GREAT BASIN/INTERMOUNTAIN WEST REMAINS ON-TRACK. GUSTY AND
ERRATIC OUTFLOW WINDS WILL BE POSSIBLE NEARBY ANY THUNDERSTORMS.
PLEASE SEE THE PREVIOUS DISCUSSION FOR MORE INFORMATION ON TODAY'S
FIRE WEATHER FORECAST.
..ELLIOTT.. 08/01/2025
PREV DISCUSSION
/ISSUED 0155 AM CDT FRI AUG 01 2025/
..SYNOPSIS
BETWEEN A LARGE-SCALE RIDGE CENTERED ON THE SOUTHWEST/NORTHERN
MEXICO AND A BROAD/SLOW-MOVING MIDLEVEL TROUGH CROSSING NORTHERN CA,
ENHANCED WEST-SOUTHWESTERLY MIDLEVEL FLOW WILL OVERSPREAD THE
SOUTHERN GREAT BASIN. DEEP BOUNDARY-LAYER MIXING INTO THIS ENHANCED
FLOW ALOFT WILL YIELD HOT, DRY, AND BREEZY CONDITIONS DURING THE
AFTERNOON. GIVEN RECEPTIVE FUELS, ELEVATED FIRE-WEATHER CONDITIONS
ARE EXPECTED ACROSS SOUTHERN NV INTO SOUTHERN UT.
FARTHER NORTH, COOL TEMPERATURES ALOFT/STEEP MIDLEVEL LAPSE RATES
ACCOMPANYING THE TROUGH WILL PROMOTE ANOTHER DAY OF ISOLATED TO
WIDELY SCATTERED HIGH-BASED THUNDERSTORMS ACROSS THE NORTHERN GREAT
BASIN/INTERMOUNTAIN WEST. INVERTED-V PROFILES AND 0.6-0.7 INCH PW
WILL FAVOR MOSTLY DRY THUNDERSTORMS, WITH A RISK OF
LIGHTNING-INDUCED IGNITIONS OVER RECEPTIVE FUELS.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
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