846
FXUS65 KSLC 051000
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
400 AM MDT TUE AUG 5 2025
SYNOPSIS
A HOT AND DRY SOUTHWEST FLOW WILL REMAIN IN PLACE
ACROSS THE REGION THROUGH MUCH OF THE WEEK. A DRY COLD FRONT MAY
BRING SOME RELIEF BY THE WEEKEND.
SHORT TERM (THROUGH 12Z THURSDAY)
SOUTHWESTERLY FLOW ALOFT
WILL REMAIN IN PLACE ACROSS THE AREA TODAY AND TOMORROW. BEHIND
A SHORTWAVE DISTURBANCE THAT EJECTED ACROSS IDAHO OVERNIGHT, A
WEAK FRONTAL BOUNDARY HAS PUSHED INTO NORTHERN UTAH. THIS WILL
RESULT IN SLIGHTLY COOLER TEMPERATURES TODAY ACROSS THE NORTH.
THAT SAID, AFTERNOON MAX TEMPERATURES WILL BE NEAR CLIMATOLOGICAL
NORMALS ACROSS THE NORTH TODAY AND UP TO 5 DEGREES ABOVE ACROSS
THE SOUTH.
A DRY AIRMASS REMAINS IN PLACE ACROSS THE BULK OF THE AREA TODAY.
MIDLEVEL MOISTURE IS PROGGED TO INCREASE ACROSS FAR SOUTHERN UTAH
LATER THIS AFTERNOON AND SPREAD FARTHER INTO SOUTHEASTERN UTAH FOR
TOMORROW. HREF MEAN PWAT VALUES ACROSS SOUTH-CENTRAL TO EAST-
CENTRAL UTAH RANGE FROM 0.65-0.85 INCHES TOMORROW AFTERNOON. THIS
COULD BRING SOME HIGH-BASED SHOWERS AND ISOLATED THUNDERSTORMS TO
THE SOUTHERN MOUNTAINS AND SOUTHEASTERN VALLEYS TOMORROW.
MOISTURE IS NOT EXPECTED TO BE DEEP ENOUGH TO PRODUCE ANY
SUBSTANTIAL RAINFALL, WITH GUSTY OUTFLOW WINDS BEING THE MAIN
IMPACT WITH ANY SHOWERS.
LONG TERM (AFTER 12Z/6AM THURSDAY)
THERE WILL BE LITTLE CHANGE IN
WEATHER CONDITIONS FROM WEDNESDAY TO THURSDAY. A STRONG RIDGE OF
HIGH PRESSURE WILL REMAIN TO THE SOUTHEAST, WHILE WEST TO SOUTHWEST
FLOW WILL BE IN PLACE THROUGHOUT SOUTHWEST WYOMING AND UTAH. AN
INCOMING LONGWAVE TROUGH WILL TRACK INTO THE PACNW THURSDAY, WHICH
WILL ENHANCE THE PRESSURE GRADIENT IN PLACE BRINGING GUSTY WINDS.
THEREFORE, THE GREATEST WIND SPEEDS AND GUSTS OF THE WEEK WILL BE
THURSDAY FOR SOUTHWEST WYOMING AND MUCH OF UTAH. MINIMUM RELATIVE
HUMIDITY VALUES WILL RANGE FROM ROUGHLY 5-15%, WITH SOUTHWEST WIND
GUSTS GENERALLY BETWEEN 25-40 MPH. RED FLAG WARNINGS CONTINUE FOR
MANY LOCATIONS THROUGH THE DAY.
THE LONGWAVE TROUGH WILL ONLY GRAZE SOUTHWEST WYOMING AND UTAH, BUT
COME CLOSE ENOUGH FOR A DRY COLD FRONT TO TRACK IN. THAT BOUNDARY
WILL PUSH INTO NORTHERN UTAH LATE THURSDAY OR EARLY FRIDAY, THEN
STALL IN SOUTHERN UTAH LATER FRIDAY. THE FRONT WILL BE DRY, BUT IT
WILL RESULT IN MUCH LIGHTER WINDS COMPARED TO THURSDAY FOR LOCATIONS
NORTH OF IT. FOR SOUTHERN UTAH, WHERE SOUTHWEST FLOW WILL CONTINUE,
AND FOR PORTIONS OF EASTERN UTAH, WHERE DOWNSLOPE WEST TO NORTHWEST
WINDS BEHIND THE FRONT WILL BE GUSTY, HIGH FIRE DANGER WILL
CONTINUE. VALLEY TEMPERATURES WILL COOL AROUND 5-10F NORTH OF THE
FRONT, WITH HIGHS IN THE MID AND UPPER 80S FRIDAY. HIGHS WILL BE
AROUND 90F AT CEDAR CITY AND IN EXCESS OF 100F FOR LAKE POWELL AND
LOWER WASHINGTON COUNTY.
WINDS WILL BE LIGHTER THROUGHOUT SOUTHWEST WYOMING AND UTAH FOR THE
WEEKEND AS THE LONGWAVE TROUGH LIFTS AND THE RIDGE TO THE SOUTHEAST
RETROGRADES INTO THE WESTERN U.S. TEMPERATURES WILL STAY COOLER THAN
NORMAL FOR ALL BUT SOUTHERN UTAH THROUGH THE WEEKEND. THERE IS HIGH
CONFIDENCE THAT RIDGING WILL PREVAIL FOR MUCH OF THE WESTERN U.S.
INTO THE WEEK, WITH TEMPERATURES WARMING AND DRY CONDITIONS.
AVIATION...KSLC
LIGHT SOUTHEAST WINDS WILL PREVAIL THROUGH THE
MORNING, WITH A TRANSITION TO LIGHT NORTHWEST WINDS AROUND 18-19Z.
MOSTLY CLEAR CONDITIONS WILL PREVAIL, BUT SMOKY CONDITIONS FROM
WILDFIRES IN THE WESTERN U.S. WILL CONTINUE.
REST OF UTAH AND SOUTHWEST WYOMING
MOSTLY CLEAR CONDITIONS WITH
RELATIVELY LIGHT WINDS WILL LAST THROUGH AROUND 18Z. SOUTH TO
SOUTHWEST WINDS WILL BE ENHANCED MUCH OF THE AFTERNOON, WITH GUSTS
FROM 20-30 KNOTS, PRIMARILY THROUGHOUT SOUTHWEST WYOMING AND
SOUTHERN UTAH. WINDS WILL TAPER OFF FROM 00-03Z. MOSTLY CLEAR
CONDITIONS WILL LAST THROUGH THE TAF PERIOD, BUT EXPECT AREAS OF
SMOKE FROM WILDFIRES IN THE WESTERN U.S.
FIRE WEATHER
A WARM AND GENERALLY DRY SOUTHWESTERLY FLOW WILL
REMAIN IN PLACE THROUGH LATE WEEK. BREEZY CONDITIONS WILL REMAIN
COMMON ESPECIALLY FOR CENTRAL, SOUTHERN, AND EASTERN UTAH, WITH
THE STRONGEST WINDS EXPECTED ON THURSDAY. MEANWHILE, RELATIVE
HUMIDITIES REMAIN LOW TODAY, WITH AFTERNOON MINIMUMS IN THE SINGLE
DIGITS ACROSS MOST VALLEYS AND EVEN SOME MOUNTAIN AREAS. MIDLEVEL
MOISTURE IS EXPECTED TO SPREAD INTO FAR SOUTHERN UTAH LATER THIS
AFTERNOON AND INCREASE FURTHER INTO SOUTHERN AND EASTERN UTAH
TOMORROW. SURFACE HUMIDITIES SHOULD RESPOND WITH A SLIGHT INCREASE
TOMORROW, BUT MANY AREAS WILL CONTINUE TO SEE AFTERNOON
HUMIDITIES BELOW 15%. A FEW HIGH-BASED SHOWERS AND ISOLATED
THUNDERSTORMS WILL BE POSSIBLE TOMORROW ACROSS THE SOUTHERN AND
CENTRAL MOUNTAINS AND SOUTHEASTERN VALLEYS IN CONJUNCTION WITH THIS
INCREASE IN MOISTURE. GUSTY AND ERRATIC OUTFLOW WINDS WILL BE THE
MAIN THREAT WITH ANY SHOWERS. THE MOISTURE WILL THEN RETREAT A
BIT FOR THE REST OF THE WEEK. CRITICAL FIRE WEATHER CONDITIONS
WILL CONTINUE THROUGH AT LEAST THURSDAY, ESPECIALLY ACROSS CENTRAL
AND SOUTHERN UTAH, DUE TO THE DRY AND BREEZY CONDITIONS. A COLD
FRONT IS THEN EXPECTED TO PUSH INTO NORTHERN UTAH LATE FRIDAY INTO
SATURDAY, WITH WINDS DECREASING BEHIND IT.
SLC WATCHES/WARNINGS/ADVISORIES
UT...RED FLAG WARNING UNTIL 9 PM MDT THURSDAY FOR UTZ481>484-488-489-
492>498.
WY...RED FLAG WARNING UNTIL 8 PM MDT FRIDAY FOR WYZ277.
CHENG/WILSON
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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