474
FXUS65 KSLC 090926
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
326 AM MDT SUN AUG 9 2026
KEY MESSAGES, ISSUED 1101 PM MDT SAT AUG 8 2026
- DANGEROUS HEAT WILL PERSIST ACROSS PORTIONS OF NORTHERN UTAH AND
THE LOW DESERT OF SOUTHERN UTAH INTO SUNDAY.
- A MARGINAL RISK OF EXCESSIVE RAINFALL WILL CONTINUE ACROSS
PORTIONS OF UTAH THROUGH THE NEXT FIVE DAYS.
- THE THREAT OF FLASH FLOODING WILL BE MOST SIGNIFICANT ACROSS
SLOT CANYONS, NORMALLY DRY WASHES, SLICK ROCK AREAS AND RECENT
BURN SCARS.
DISCUSSION, ISSUED 1101 PM MDT SAT AUG 8 2026
HIGH PRESSURE OVER THE FOUR-CORNERS REGION WILL
CONTINUE TO SUPPORT A MONSOON SURGE INTO UTAH OVER THE NEXT 5-7
(OR MORE) DAYS. EVENING ANALYSIS INDICATES THAT A POTENTIAL MCV IS
DEVELOPING OVER CENTRAL ARIZONA. THIS MAY ROTATING AROUND THE
RIDGE INTO UTAH SUNDAY...POTENTIALLY INCREASING THE THREAT OF
FLASH FLOODING. THIS WILL BE SOMETHING TO WATCH SUNDAY.
LOOKING AT CAMS THIS EVENING, FAIRLY WIDESPREAD CONVECTION IS
FORECAST ACROSS MUCH OF THE REGION. HREF SUGGEST PEAK RAINFALL
RATES SUNDAY WILL BE BETWEEN 0.25 TO 0.50 INCHES PER HOUR,
HOWEVER, LOOKING AT GROUND TRUTH TODAY, STRONGER STORMS WERE
CAPABLE OF RATES A BIT HIGHER THAN 0.50 INCHES PER HOUR GIVEN SLOW
STORM MOTIONS.
ADJUSTED HEAT HEADLINES BASED ON LATEST TRENDS. WITH LOWS
STRUGGLING TO FALL BELOW 80 DEGREES FOR THE LOWER DESERTS OF
SOUTHERN UTAH, EXTENDED THE EXCESSIVE HEAT WARNINGS FOR LOWER
WASHINGTON COUNTY, ZION NATIONAL PARK AND GLEN CANYON NATIONAL
RECREATION AREA. EVEN THOUGH HIGHS WILL BE SLIGHTLY COOLER SUNDAY,
THE LACK OF ANY MEANINGFUL RELIEF OVERNIGHT WILL CONTINUE TO
CREATE CUMULATIVE HEAT STRESS...ESPECIALLY FOR THOSE WITHOUT
ADEQUATE COOLING AND/OR HYDRATION.
WITH COOLER TEMPERATURES FORECAST ACROSS CENTRAL UTAH, CANCELLED
GOING HEAT PRODUCTS FOR THESE AREAS.
EXPECT CONVECTION TO CONTINUE EACH AFTERNOON AND EVENING WITH AN
ATTENDANT FLASH FLOODING THREAT THROUGH AT LEAST THE NEXT 5 TO 7
DAYS.
AVIATION, ISSUED 1101 PM MDT SAT AUG 8 2026
KSLC, ISSUED 1101 PM MDT SAT AUG 8 2026...
SOUTHEASTERLY WINDS WILL CONTINUE OVERNIGHT,
LIKELY SHIFTING TO NORTHWESTERLY BETWEEN 19-20Z. HOWEVER, ISOLATED
THUNDERSTORMS DEVELOPING FIRST OVER HIGHER TERRAIN BETWEEN 20-00Z
MAY RESULT IN GUSTY AND ERRATIC OUTFLOW WINDS. A SECOND ROUND OF
A FEW SHOWERS AND THUNDERSTORMS MAY LINGER INTO THE EVENING
BETWEEN 01-06Z, THOUGH CONFIDENCE IS LOW ON TIMING. VFR CONDITIONS
WILL PREVAIL WITH HAZY SKIES FROM WILDFIRE SMOKE.
REST OF UTAH AND SOUTHWEST WYOMING...WINDS WILL CONTINUE TO
SUBSIDE AS LINGERING SHOWERS ACROSS MAINLY SOUTHWESTERN UTAH
DIMINISH OVER THE NEXT COUPLE OF HOURS. BY 10Z OR SO, WINDS WILL
BE LARGELY LIGHT AND TERRAIN-DRIVEN. SCATTERED SHOWERS AND
THUNDERSTORMS ARE EXPECTED TO DEVELOP AFTER 18-19Z ACROSS MUCH OF
THE STATE; ANY STORMS WILL BE CAPABLE OF GUSTY AND ERRATIC OUTFLOW
WINDS. VFR CONDITIONS WILL LARGELY PREVAIL OUTSIDE OF AREAS NEAR
LOCAL WILDFIRES AND OUTSIDE ANY BLOWING DUST FROM OUTFLOW WINDS.
FIRE WEATHER
HIGH PRESSURE CENTERED OVER THE FOUR CORNERS WILL
ALLOW MONSOON MOISTURE OVER SOUTHERN AND WESTERN UTAH TO SPREAD
NORTH AND EAST TODAY ACROSS THE REMAINDER OF THE STATE. THIS WILL
BRING INCREASING COVERAGE OF SHOWERS AND THUNDERSTORMS, PRIMARILY
FOCUSED OVER THE HIGHER TERRAIN, ALONG WITH IMPROVED RELATIVE
HUMIDITY VALUES. ANY STORMS THAT DEVELOP WILL HAVE A CHANCE OF
PRODUCING WETTING RAINFALL, BUT WILL ALSO BRING LIGHTNING AND
PERIODS OF GUSTY AND ERRATIC WINDS. THE RIDGE IS EXPECTED TO MOVE
LITTLE FOR MUCH OF THE WEEK, KEEPING THE MOISTURE IN PLACE AND
BRINGING A DAILY THREAT OF SHOWERS AND THUNDERSTORMS.
SLC WATCHES/WARNINGS/ADVISORIES
UT...EXTREME HEAT WARNING UNTIL MIDNIGHT MDT TONIGHT FOR UTZ101-102-
104-105.
HEAT ADVISORY UNTIL MIDNIGHT MDT TONIGHT FOR UTZ103-106-107-116.
EXTREME HEAT WARNING UNTIL 9 PM MDT THIS EVENING FOR UTZ123-124-
131.
WY...RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR WYZ277.
PUBLIC...
AVIATION...
FIRE WEATHER...TRAPHAGAN
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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