255
FXUS65 KSLC 212258
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
358 PM MST FRI NOV 21 2025
SYNOPSIS
POTENTIAL FOR DENSE FOG DEVELOPMENT EXISTS ONCE AGAIN
TONIGHT ACROSS NORTHERN UTAH VALLEYS AND UINTA COUNTY, WY.
OTHERWISE, QUIESCENT CONDITIONS EXPECTED AREAWIDE THROUGH THE
WEEKEND, SAVE FOR LIGHT PRECIPITATION OVER FAR SOUTHEAST UTAH ON
SUNDAY.
DISCUSSION
KEY POINTS:
- DENSE FOG IS POSSIBLE ONCE AGAIN TONIGHT ACROSS NORTHERN UTAH
VALLEYS AND UINTA COUNTY, WY.
- DRY CONDITIONS EXPECTED AREAWIDE THROUGH THE WEEKEND, EXCEPT FOR
SOUTHEAST UTAH WHERE A SYSTEM PASSING THROUGH THE FOUR CORNERS
WILL BRING LIGHT RAIN/HIGH ELEVATION SNOW.
- A COLD FRONT PASSAGE LATE MONDAY BRINGS MUCH COOLER TEMPERATURES
ON TUESDAY, WITH THE SEASON'S FIRST FREEZE POSSIBLE FOR LOWER
WASHINGTON COUNTY.
MID-LEVEL WATER VAPOR IMAGERY THIS AFTERNOON DEPICTS A CLOSED LOW
CURRENTLY CENTERED OFF THE COAST OF FAR SOUTHERN CALIFORNIA, WITH
SOME ASSOCIATED MOISTURE WRAPPING INTO SOUTHWEST UTAH. SOME
LIGHT, ISOLATED SHOWERS ARE NOTED ACROSS THE HIGH TERRAIN AS A
RESULT. THIS SHOWER ACTIVITY IS EXPECTED TO TAPER THIS EVENING AS
THE LOW DIGS FURTHER SOUTH OFF THE BAJA COAST INTO EARLY SATURDAY.
ACROSS NORTHERN UTAH AND SOUTHWEST WYOMING, DENSE FOG WILL BE A
CONCERN ONCE AGAIN TONIGHT FOR VALLEY LOCATIONS AS DEW POINTS
REMAIN ELEVATED WITH CLEARING SKIES. EXACT LOCATIONS OF FOG
DEVELOPMENT ARE A BIT MORE UNCERTAIN COMPARED TO LAST NIGHT,
GIVEN LOW CLOUD COVER HAS LINGERED LONGER THAN EXPECTED ACROSS
SOME AREAS INCLUDING THE CACHE VALLEY AND PORTIONS OF THE WASATCH
BACK. ANY FOG THAT DEVELOPS OVERNIGHT INTO SATURDAY MORNING WILL
BE CAPABLE OF PRODUCING VISIBILITY REDUCTIONS TO LESS THAN A
QUARTER MILE AT TIMES.
AFTER ANOTHER MOSTLY DRY DAY REGIONWIDE ON SATURDAY, THE
AFOREMENTIONED LOW WILL EJECT INLAND AND TRACK ACROSS THE FOUR
CORNERS REGION ON SUNDAY. THIS SYSTEM WILL BRING INCREASED CHANCES
FOR PRECIPITATION ACROSS SOUTHEAST UTAH -- THOUGH, GIVEN THAT THE
REGION WILL REMAIN ON THE FRINGES OF GREATEST MOISTURE TRANSPORT,
TOTAL ACCUMULATIONS ARE EXPECTED TO REMAIN GENERALLY LIGHT,
GENERALLY A FEW HUNDREDTHS OF AN INCH OF LESS. LOCALLY HIGHER
AMOUNTS UP TO A TENTH OF AN INCH ARE POSSIBLE IN THE HIGHER
TERRAIN ACROSS SOUTH-CENTRAL UTAH.
AFTER THE UPPER-LEVEL LOW EXITS THE REGION LATE SUNDAY, A
SHORTWAVE TROUGH IS SLATED TO TRACK TO OUR NORTH ACROSS THE
NORTHERN ROCKIES LATE MONDAY. A DRY COLD FRONT PASSAGE ACROSS UTAH
AND SOUTHWEST WYOMING WILL ACCOMPANY THIS SYSTEM, YIELDING MUCH
COOLER TEMPERATURES REGIONWIDE BY TUESDAY MORNING. LOWS FOR LOWER
VALLEYS ACROSS CENTRAL AND NORTHERN UTAH ARE EXPECTED TO DIP INTO
THE MID TO UPPER 20S, WITH THE WASATCH BACK AND SOUTHWEST WYOMING
SEEING LOWS IN THE TEENS. FOR LOWER WASHINGTON COUNTY, LOWS IN
THE MID TO UPPER 30S ARE EXPECTED ON TUESDAY. NORTHERLY WINDS BEHIND
THE FRONT MONDAY NIGHT INTO TUESDAY MORNING MAY YIELD GAP WINDS
ACROSS LOWER WASHINGTON COUNTY, NOTABLY AREAS NEAR THE BLACK RIDGE
CANYON, WHICH WILL KEEP TEMPERATURES A BIT MORE MODERATED IN THESE
AREAS. WEDNESDAY MORNING WILL TREND EVEN COOLER FOR LOWER
WASHINGTON COUNTY AS WINDS EASE OVERNIGHT, WITH A 20-40% CHANCE
TO REACH FREEZING.
AVIATION...KSLC
PREDOMINANTLY VFR CONDITIONS ARE EXPECTED THROUGH
THE TAF PERIOD, WITH NORTHWEST WINDS SWITCHING BACK TO SOUTHEAST
AROUND 03Z. AFTER 06Z THERE IS A 20% CHANCE FOR DENSE FOG DEVELOPING
ACROSS THE AIRFIELD REDUCING VISIBILITY TO LESS THAN 1/2 MILE. ANY
FOG WHICH DOES DEVELOP WILL DISSIPATE BY 16Z SATURDAY.
REST OF UTAH AND SOUTHWEST WYOMING
POCKETS OF MVFR CIGS WILL
PERSIST THROUGH THE REMAINDER OF THE AFTERNOON ACROSS NORTHERN UTAH
AND SOUTHWEST WYOMING WHILE VFR CONDITIONS PREVAIL ELSEWHERE. AFTER
04Z THIS EVENING PATCHY DENSE FOG WILL REDEVELOP ACROSS NORTHERN
UTAH AND SOUTHWEST WYOMING, POTENTIALLY RESULTING IN LIFR TO VLIFR
CONDITIONS WITH VISIBILITY LESS THAN 1/4 MILE AT AREA TERMINALS. ANY
FOG WHICH DEVELOPS WILL PERSIST THROUGH AT LEAST MID-MORNING
SATURDAY.
SLC WATCHES/WARNINGS/ADVISORIES
UT...NONE.
WY...NONE.
PUBLIC...WHITLAM
AVIATION...SEAMAN
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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