990
FXUS65 KSLC 060047
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
646 PM MDT WED AUG 5 2026
KEY MESSAGES, ISSUED 111 PM MDT WED AUG 5 2026
- AN INFLUX OF SMOKE ORIGINATING FROM NUMEROUS FIRES ACROSS THE
PACIFIC NORTHWEST WILL CONTINUE THROUGH AT LEAST THURSDAY.
- WIDESPREAD DANGEROUS HEAT DEVELOPS ACROSS SOUTHERN UTAH ON
THURSDAY, THEN BECOMES MORE WIDESPREAD ACROSS THE REMAINDER OF
UTAH FRIDAY INTO SATURDAY.
- SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING MICROBURST WINDS
ARE EXPECTED EACH AFTERNOON THURSDAY INTO THE WEEKEND, MAINLY
ACROSS SOUTHWEST UTAH.
- MONSOON MOISTURE SPREADS NORTHWARD SUNDAY INTO EARLY NEXT WEEK,
RESULTING IN MORE WIDESPREAD STORMS CAPABLE OF PRODUCING
ISOLATED FLASH FLOODING.
DISCUSSION, ISSUED 111 PM MDT WED AUG 5 2026
RECENT SATELLITE IMAGERY SHOWS SMOKE FROM FIRES
ACROSS THE PACIFIC NORTHWEST LINGERING ACROSS CENTRAL AND NORTHERN
UTAH AND SOUTHWEST WYOMING THIS AFTERNOON. WESTERLY FLOW
DEVELOPING ON THE NORTHERN FRINGE OF A STRENGTHENING HIGH
PRESSURE RIDGE IS EXPECTED TO SCOUR SOME OF THIS SMOKE OUT OF
NORTHERN UTAH OVERNIGHT, BUT SOME HAZE MAY LINGER INTO THURSDAY.
ACROSS CENTRAL UTAH, THE WIDEMOUTH 2 FIRE CONTINUES TO OUTPUT HIGH
CONCENTRATIONS OF NEAR SURFACE SMOKE. THIS FIRE WILL CONTINUE TO
IMPACT SURROUNDING AREAS WHILE IT REMAINS ACTIVE, BUT MORE
EFFICIENT MIXING ON THURSDAY WILL KEEP THE IMPACT FOOTPRINT
SMALLER AS SMOKE BECOMES MORE VERTICALLY INTEGRATED INTO THE
ATMOSPHERE.
THE AFOREMENTIONED RIDGE WILL CONTINUE TO AMPLIFY OVER THE GREAT
BASIN THROUGH SATURDAY, RESULTING IN TEMPERATURES CLIMBING WELL
ABOVE AVERAGE THROUGH THIS PERIOD. HIGH TEMPERATURES PEAK ON
SATURDAY, WITH HIGHS AROUND 10 DEGREES ABOVE AVERAGE. LOW
TEMPERATURES GRADUALLY INCREASE THROUGH THE WEEKEND AS WELL, WITH
THE WASATCH FRONT AND LOWER WASHINGTON COUNTY SEEING EXACERBATED
HEAT IMPACTS AS A RESULT. GIVEN THIS, EXTREME HEAT WARNINGS WERE
ISSUED FOR MOST SOUTHERN UTAH VALLEYS THURSDAY THROUGH SATURDAY,
AND THE WASATCH FRONT, GREAT SALT LAKE DESERT, AND CASTLE
COUNTRY/SAN RAFAEL SWELL THROUGH SUNDAY. HEAT ADVISORIES ARE IN
EFFECT FOR ALL OTHER VALLEYS ACROSS THE STATE.
INTENSE HEATING UNDER THIS ANOMALOUS RIDGE WILL RESULT IN
INCREASED CHANCES FOR AFTERNOON SHOWERS AND THUNDERSTORMS, MAINLY
ACROSS SOUTHWEST UTAH, BEGINNING THURSDAY. CHANCES FOR AFTERNOON
CONVECTIVE DEVELOPMENT WILL CONTINUE THROUGH THE WEEKEND, WITH THE
MAIN IMPACT FROM STORMS THROUGH SATURDAY BEING DRY LIGHTNING AND
GUSTY AND ERRATIC OUTFLOW WINDS, GIVEN DRY LOWER LEVELS THROUGH
THIS PERIOD. THE RIDGE SHIFTS EASTWARD SUNDAY, INTRODUCING A MORE
FAVORABLE SOUTHERLY FLOW PATTERN FOR MONSOON MOISTURE TO SPREAD
INTO THE REGION THROUGH EARLY NEXT WEEK. STORMS WILL TRANSITION
WETTER BY SUNDAY ACROSS SOUTHWEST UTAH, WITH COVERAGE EXPANDING
NORTHWARD INTO EARLY NEXT WEEK AS MOISTURE CONTINUES TO SPREAD
NORTH. THE POTENTIAL FOR WETTER STORMS ON SUNDAY RAISES CONCERNS
FOR LOCALLY HEAVY RAINFALL TO PRODUCE FLASH FLOODING, ESPECIALLY
FOR SLOT CANYONS, RECENT BURN SCARS, AND NORMALLY DRY WASHES.
AVIATION
KSLC...WINDS ARE EXPECTED TO GENERALLY REMAIN LIGHT (LESS THAN 10
KTS), WITH SHIFTS NEAR TYPICAL DIURNAL TIMES. ASIDE FROM SMOKE,
SKIES ARE EXPECTED TO REMAIN CLEAR TO MOSTLY CLEAR. THERE IS A 30 TO
50 PERCENT POTENTIAL OF BRIEF MVFR VIS DUE TO SUN GLINT NEAR SUNRISE
AND SUNSET, OTHERWISE VFR CONDITIONS WILL PREVAIL.
REST OF UTAH AND SOUTHWEST WYOMING...AT NORTHERN TERMINALS, SKIES
REMAIN CLEAR TO MOSTLY CLEAR ASIDE FROM SMOKE FILTERING THROUGH.
WINDS ARE EXPECTED TO SEE DIURNALLY TYPICAL DIRECTIONAL SHIFTS.
MAGNITUDES WILL LARGELY REMAIN LIGHT (LESS THAN 10 KTS) WITH SOME
MODEST GUSTS 20-25 KTS AT TYPICALLY BREEZY OR EXPOSED TERMINALS.
SOME BRIEF MVFR VIS (30-50% CHANCE) WILL BE POSSIBLE NEAR SUNRISE
AND SUNSET FROM SUN GLINT WHERE SMOKE SETTLES, BUT OTHERWISE VFR
CONDITIONS PREVAIL. AT SOUTHERN TERMINALS, DIURNAL WINDS ARE
EXPECTED, BUT A SLIGHT INCREASE IN MOISTURE WILL BRING INCREASING
CLOUD COVER. AT TERMINALS NEAR CDC, THERE WILL BE POTENTIAL FOR
AFTERNOON CONVECTION, AS WELL AS GUSTY ERRATIC OUTFLOW WINDS.
FIRE WEATHER, ISSUED 111 PM MDT WED AUG 5 2026
DRY CONDITIONS CONTINUE STATEWIDE WITH WIDESPREAD
RELATIVE HUMIDITY VALUES IN THE SINGLE DIGITS TO LOW TEENS AND
POOR OVERNIGHT RECOVERIES THROUGH SATURDAY, COURTESY OF STRENGTHENING
HIGH PRESSURE ACROSS THE WESTERN US. THIS PATTERN WILL ALSO
RESULT IN A WARMING TREND THROUGH SATURDAY, WITH TEMPERATURES
CLIMBING AROUND 10 DEGREES ABOVE AVERAGE BY FRIDAY. INTENSE
HEATING WILL YIELD INCREASING CHANCES FOR AFTERNOON SHOWERS AND
THUNDERSTORMS BEGINNING THURSDAY AND CONTINUING INTO THE WEEKEND,
MAINLY ACROSS SOUTHERN UTAH. STORMS WILL BE ON THE DRIER SIDE
BETWEEN THURSDAY AND SATURDAY, WITH MAIN THREATS BEING DRY
LIGHTNING AND GUSTY AND ERRATIC OUTFLOW WINDS TO 50 MPH. A MODEST
SURGE OF MONSOON MOISTURE IS EXPECTED SUNDAY INTO EARLY NEXT WEEK,
AND AS SUCH COVERAGE OF STORMS EXPANDS NORTHWARD WITH BETTER
POTENTIAL ACROSS SOUTHERN UTAH FOR STORMS TO PRODUCE LOCALLY HEAVY
RAINFALL.
SLC WATCHES/WARNINGS/ADVISORIES
UT...EXTREME HEAT WARNING FROM NOON FRIDAY TO MIDNIGHT MDT SUNDAY
NIGHT FOR UTZ101-102-104-105-115-120-121.
HEAT ADVISORY FROM NOON FRIDAY TO MIDNIGHT MDT SUNDAY NIGHT FOR
UTZ103-106-107-114-116.
HEAT ADVISORY FROM NOON THURSDAY TO 9 PM MDT SATURDAY FOR UTZ118-
119-122-126-127.
EXTREME HEAT WARNING FROM NOON THURSDAY TO 9 PM MDT SATURDAY FOR
UTZ123-124-128>131.
WY...RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR WYZ277.
PUBLIC...WHITLAM
AVIATION...WARTHEN
FIRE WEATHER...WHITLAM
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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