055
FXUS65 KSLC 201917
AFDSLC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
117 PM MDT SUN SEP 20 2026
KEY MESSAGES
- AN UPPER LEVEL LOW DROPPING INTO THE GREAT BASIN LATE MONDAY
WILL SPARK WIDESPREAD SHOWERS AND THUNDERSTORMS PERSISTING
THROUGH EARLY WEDNESDAY.
- MOISTURE BECOMES CONFINED TO EASTERN/SOUTHEASTERN UTAH FOR THE
REMAINDER OF THE WEEK.
DISCUSSION
DRY AND STABLE CONDITIONS REMAIN ACROSS THE REGION
WITH TEMPERATURES RUNNING 5-7 DEGREES COOLER THAN NORMAL ACROSS
NORTHERN UTAH AND NEAR NORMAL ACROSS SOUTHERN UTAH. MOISTURE
STARTS TO ADVECT BACK INTO UTAH AND SW WYOMING TOMORROW AS AN
UPPER-LEVEL LOW SWINGS INTO THE GREAT BASIN. THIS LOW WILL
INITIATE CONVECTION ACROSS SOUTHERN UTAH LATE MONDAY WITH MOISTURE
SPREADING NORTH AND INTO NORTHERN UTAH BY TUESDAY. PWATS APPROACH
THE 90TH PERCENTILE FOR THIS TIME OF YEAR, BUT STORM MOTION WILL
BE FAST ENOUGH TO LIMIT FLOODING IMPACTS EXCEPT FOR AREAS THAT
EXPERIENCE ANY TRAINING STORMS. STEEP LAPSE RATES AND 30-50 KTS
OF SHEAR WILL HELP STORMS MATURE AND STAY MATURE. SOME ISOLATED
STRONG THUNDERSTORMS WILL BE POSSIBLE.
AS THE LOW TRACKS TO THE EAST CONDITIONS WILL BECOME QUIETER
ACROSS MOST OF UTAH, BUT MOISTURE WILL REMAIN ELEVATED ACROSS
SOUTHEASTERN UTAH THROUGH MUCH OF THE WEEK. THIS LATE MONSOON
MOISTURE TAP WILL KEEP DIURNAL STORM CHANCES EACH DAY ACROSS AREAS
OF SOUTHEASTERN UTAH.
AVIATION
KSLC...VFR CONDITIONS WILL PERSIST ACROSS THE KSLC AIRSPACE THROUGH
THE TAF PERIOD WITH DIURNAL WIND SHIFTS. THE NEXT WIND SHIFT TO
SOUTHEASTERLY IS EXPECTED AROUND 04Z.
REST OF UTAH AND SOUTHWEST WYOMING...VFR CONDITIONS ARE EXPECTED TO
PERSIST ACROSS ALL TERMINALS THROUGH THE TAF PERIOD WITH DIURNAL
WIND SHIFTS.
FIRE WEATHER
COOL, DRY, AND STABLE CONDITIONS WILL CONTINUE AREAWIDE UNTIL MONDAY
EVENING WHEN SHOWERS AND STORMS MOVE INTO SOUTHERN UTAH THANKS TO
AN AREA OF LOW PRESSURE MOVING INTO THE GREAT BASIN. THESE STORMS
WILL BE MOVING FROM SOUTH TO NORTH, ARRIVING IN NORTHERN UTAH ON
TUESDAY. THESE STORMS WILL BE FAST MOVING, BUT RAINFALL RATES WILL
BE HIGH ENOUGH TO QUICKLY PRODUCE WETTING RAINS. SOME STRONG
STORMS WILL BE EMBEDDED WITHIN THE COMPLEX WHICH WILL BE CAPABLE
OF STRONG AND ERRATIC WINDS, FREQUENT LIGHTNING, AND SOME HAIL.
CONDITIONS BECOME MOSTLY DRY AND STABLE BY WEDNESDAY, EXCEPT FOR
AREAS OF EASTERN UTAH THAT HOLD ON TO MOISTURE, WITH NEAR NORMAL
CONDITIONS PERSISTING THROUGH THE REMAINDER OF THE WEEK.
SLC WATCHES/WARNINGS/ADVISORIES
UT...NONE.
WY...NONE.
PUBLIC...MAHAN
AVIATION...VERZELLA
FIRE WEATHER...MAHAN
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY
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