811
FXUS65 KSLC 242108
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
308 PM MDT FRI OCT 24 2025
SYNOPSIS
HIGH PRESSURE WILL BRING MOSTLY CLEAR AND MILD
CONDITIONS THROUGH SATURDAY. A FAST MOVING STORM SYSTEM WILL BRING
COOLER CONDITIONS AND UNSETTLED WEATHER TO NORTHERN UTAH AND
SOUTHWEST WYOMING SUNDAY INTO MONDAY, WITH DRIER CONDITIONS
RETURNING THEREAFTER.
SHORT TERM (THROUGH 12Z/6AM MONDAY)
HIGH PRESSURE IS CENTERED
OVER UTAH AND SOUTHWEST WYOMING THIS AFTERNOON IN BETWEEN THE
EXITING DESERT SOUTHWEST STORM SYSTEM AND ANOTHER SYSTEM MOVING
ONSHORE ALONG THE PACIFIC NORTHWEST COAST. UNDER THE INFLUENCE OF
THE RIDGE, SEEING MOSTLY CLEAR SKIES, DRY CONDITIONS, AND HIGH
TEMPERATURES NEAR NORMAL FOR THIS TIME OF YEAR. DRY CONDITIONS
WILL CONTINUE FOR THE MAJORITY OF TOMORROW AS THE RIDGE FLATTENS
AND SHIFTS EAST IN RESPONSE TO THE MOVEMENT OF THE PACIFIC
NORTHWEST SYSTEM. WITH INCREASED SOUTHERLY FLOW, WILL SEE
ADDITIONAL WARMING, WITH MAXES AVERAGING 5F ABOVE CLIMO.
THE PACIFIC NORTHWEST SYSTEM IS EXPECTED TO BE WEAKENING AND
MOVING QUICKLY AS IT GRAZES NORTHERN UTAH AND SOUTHWEST WYOMING
OVERNIGHT SATURDAY INTO SUNDAY. THIS WILL BRING A FRONTAL BOUNDARY
INTO NORTHERN PORTIONS OF THE AREA DURING THE DAY SUNDAY, WITH THE
BEST THREAT OF VALLEY RAIN AND MOUNTAIN SNOW AT THAT TIME.
HOWEVER, BEST MOISTURE AND INSTABILITY LOOKS TO REMAIN NORTH OF
THE AREA AND THE SYSTEM IS MOVING QUICKLY, SO ASSOCIATED
ACCUMULATIONS FOR THE NORTHERN UTAH MOUNTAINS WILL BE ON THE LIGHT
SIDE, WITH THE HIGHEST AMOUNTS NEAR THE UTAH/IDAHO BORDER.
TEMPERATURES SHOULD ALSO COOL NOTICEABLY FOR NORTHERN UTAH AND
SOUTHWEST WYOMING, WITH MAXES SUNDAY INTO MONDAY RUNNING 10F BELOW
SEASONAL NORMALS. SOUTHERN UTAH COOLING WILL BE MORE PALTRY, WITH
MAXES RETURNING TO AROUND NORMAL FOR THIS TIME OF YEAR.
LONG TERM (AFTER 12Z/6AM MONDAY)
AT THE START OF THE LONG-TERM
PERIOD, THE MAIN TROUGH WILL BE EXITING TO OUR EAST WITH
ANTICYCLONIC WESTERLY TO NORTHWESTERLY FLOW BUILDING INTO THE
REGION. AS SUCH, PRECIPITATION ACROSS NORTHERN UTAH WILL BEGIN TO
DWINDLE AS SYNOPTIC SUPPORT WANES, THOUGH LINGERING LOW- TO MID-
LEVEL MOISTURE WILL HELP LIGHT MOUNTAIN SHOWERS THROUGH THE DAY ON
MONDAY...AND POTENTIALLY INTO TUESDAY DEPENDING ON WHEN THAT
MOISTURE DISSIPATES. THERE IS STILL UNCERTAINTY WITH THE EXTENT OF
COLD AIR ACROSS NORTHERN UTAH, THUS A WIDE SPREAD IN SNOW LEVEL
STILL EXISTS; ALONG THE UT-ID BORDER, THE LIKELY (25TH-75TH
PERCENTILE) RANGE IS BETWEEN 4000-6000FT, RESULTING IN HIGH
UNCERTAINTY OF PRECIPITATION TYPE IN FAR NORTHERN VALLEYS. LUCKILY,
ANY ADDITIONAL QPF SHOULD BE LOW GIVEN AFOREMENTIONED FACTORS, THUS
IMPACTS SHOULD BE MINIMAL EITHER WAY. THERE STILL REMAINS A LOW
CHANCE FOR LAKE-EFFECT PRECIPITATION FOR THE NORTHERN WASATCH FRONT
ON MONDAY MORNING, BUT OVERALL THIS THREAT IS LIMITED BY A STABLE
LAYER IN THE LOW- TO MID-LEVELS AND AN OVERALL LACK OF SUFFICIENT
MOISTURE.
AS HIGH PRESSURE AND WARM-AIR ADVECTION DOMINATE THE PATTERN HEADING
INTO TUESDAY AND WEDNESDAY, EXPECT DRY CONDITIONS WILL TEMPERATURES
REACHING JUST ABOVE NORMAL. MODEL GUIDANCE IS SOMEWHAT SPLIT ON HOW
MUCH THIS RIDGE IS ABLE TO BUILD ACROSS THE WESTERN US; THE MAJORITY
(~TWO-THIRDS OF MEMBERS) FAVOR A WEAKER RIDGE THAT MAY ALLOW A
PASSING SHORTWAVE TROUGH IN THE THURSDAY-FRIDAY TIMEFRAME, WITH THE
REST FAVORING A STRONGER RIDGE WITH WARMER AND DRIER CONDITIONS.
OVERALL, THE WEATHER BEYOND MONDAY SHOULD BE RELATIVELY QUIET, WITH
TEMPERATURES HOVERING NEAR TO JUST ABOVE NORMAL.
AVIATION...KSLC
VFR CONDITIONS WILL PREVAIL THROUGH THE TAF
PERIOD AT THE KSLC TERMINAL. GENERALLY DIURNAL WIND SHIFTS WILL
OCCUR THIS EVENING WITH SOUTHERLY WINDS WITH STRONG GUSTS IN EXCESS
OF 20KTS AND UPPER LEVEL CLOUD COVER INCREASING AHEAD OF AN INCOMING
SYSTEM TOMORROW AFTERNOON.
REST OF UTAH AND SOUTHWEST WYOMING
VFR CONDITIONS PERSIST ACROSS
ALL TERMINALS THROUGH THE TAF PERIOD. SOUTHERLY WINDS INCREASE
TOMORROW AFTERNOON AHEAD OF AN INCOMING SYSTEM WITH INCREASING UPPER
LEVEL CLOUD COVER AND STRONG WIND GUSTS IN EXCESS OF 20KTS EXPECTED
ACROSS THE MAJORITY OF OUR TAF SITES.
SLC WATCHES/WARNINGS/ADVISORIES
UT...NONE.
WY...NONE.
SHORT TERM...TRAPHAGAN
LONG TERM...CUNNINGHAM
AVIATION...WORSTER
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page