835
FXUS65 KSLC 051839
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1239 PM MDT WED AUG 5 2026
KEY MESSAGES, ISSUED 1029 PM MDT TUE AUG 4 2026
- AN INFLUX OF SMOKE ORIGINATING FROM NUMEROUS FIRES ACROSS THE
PACIFIC NORTHWEST WILL CONTINUE THROUGH AT LEAST THURSDAY.
- A GRADUAL WARMING TREND THROUGH THE LATTER HALF OF THE WEEK
BRINGS THE POTENTIAL FOR WIDESPREAD DANGEROUS HEAT TO DEVELOP
FRIDAY INTO SATURDAY.
- CHANCES FOR AFTERNOON SHOWERS AND THUNDERSTORMS WITH MICROBURST
POTENTIAL BEGIN AS EARLY AS THURSDAY ACROSS SOUTHWEST UTAH, WITH
THE THREAT BECOMING MORE WIDESPREAD EARLY NEXT WEEK AS MONSOON
MOISTURE SURGES NORTHWARD.
DISCUSSION, ISSUED 1029 PM MDT TUE AUG 4 2026
UTAH AND SOUTHWEST WYOMING ARE UNDER A DRY WEST TO
NORTHWEST FLOW THIS EVENING AS HIGH PRESSURE REBUILDS ALONG THE
PACIFIC COAST. HIGH TEMPERATURES STAYED UP TO 5F BELOW SEASONAL
NORMALS OVER NORTHERN PORTIONS OF THE AREA, WHILE TEMPERATURES
STAYED ABNORMALLY HOT OVER SOUTHERN UTAH. A HIGH OF 99F AT CEDAR
CITY TIED THE RECORD HIGH FOR THE DATE, WITH SOME POSSIBILITY THAT
OTHER DAILY RECORDS WERE BROKEN.
THE RIDGE WILL CONTINUE TO BUILD OVER THE NEXT FEW DAYS, SLOWLY
SHIFTING EAST AS IT DOES SO. BY FRIDAY, THE RIDGE IS EXPECTED TO
BE OVERHEAD, AND HIGHS UP TO 10F ABOVE SEASONAL NORMALS WILL BE
COMMON FOR BOTH FRIDAY AND SATURDAY, BRINGING THE POTENTIAL OF AN
INCREASE IN HEAT RELATED ILLNESS.
THE POSITION OF THE RIDGE IS EXPECTED TO ALLOW A SUBTLE INTRUSION
OF MONSOON MOISTURE INTO SOUTHERN UTAH, POTENTIALLY AS EARLY AS
THURSDAY. THIS MOISTURE WILL ALLOW FOR THE DEVELOPMENT OF A FEW
HIGH BASED SHOWERS AND THUNDERSTORMS, PRIMARILY FOCUSED OVER THE
HIGHER TERRAIN OF SOUTHERN UTAH. ANY STORMS THAT DEVELOP WILL BE
CAPABLE OF PRODUCING GUSTY AND ERRATIC DOWNBURST WINDS.
BY SUNDAY INTO MONDAY, THERE IS GOOD AGREEMENT IN GUIDANCE THAT
THE RIDGE AXIS WILL SHIFT EAST OF THE AREA, BECOMING CENTERED OVER
THE FOUR CORNERS. THIS POSITIONING OF THE RIDGE IS A TYPICAL
SCENARIO FOR A LARGER SURGE OF MONSOON MOISTURE ACROSS THE
FORECAST AREA. THUS, THERE WILL BE DECREASING TEMPERATURES AND
INCREASE IN THE POTENTIAL FOR PRECIPITATION, WITH THE PRIMARY
THREAT OVER THE AREA, PARTICULARLY SOUTHERN UTAH, SHIFTING TOWARD
FLASH FLOODING FOR AT LEAST THE FIRST PART OF THE UPCOMING WEEK.
AVIATION, ISSUED 1116 AM MDT WED AUG 5 2026
KSLC...NORTHWESTERLY WINDS WILL PREVAIL THROUGH THE AFTERNOON,
TRANSITIONING TO SOUTHEASTERLY BETWEEN 03-04Z. VFR CONDITIONS WILL
MOSTLY PERSIST OUTSIDE OF A WINDOW AROUND SUNSET AND SUNRISE WHERE
WILDFIRE SMOKE MAY PRODUCE SLANTWISE VIS REDUCTIONS DOWN TO MVFR FOR
AN HOUR OR TWO.
REST OF UTAH AND SOUTHWEST WYOMING...WINDS WILL LARGELY BE LIGHT AND
TERRAIN-DRIVEN, THOUGH EASTERN UTAH THIS AFTERNOON WILL FAVOR BREEZY
WESTERLY WINDS WITH GUSTS TO 20-25KTS. VFR CONDITIONS WILL LARGELY
PERSIST WITH HAZY SKIES, THOUGH LINGERING WILDFIRE SMOKE COULD
PRODUCE SLANTWISE VIS REDUCTIONS DOWN TO MVFR ACROSS
CENTRAL/NORTHERN UTAH. SITES NEAR LOCAL WILDFIRES COULD SEE FURTHER
REDUCTIONS.
FIRE WEATHER
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...TRAPHAGAN
AVIATION...CUNNINGHAM
FIRE WEATHER...WHITLAM
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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