017
FNUS75 KSLC 172107
FWSSLC
SPOT FORECAST FOR WIDEMOUTH 2...FOREST SERVICE
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
307 PM MDT THU SEP 17 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A WEATHER SYSTEM PASSING THROUGH THE REGION WILL BRING
ADDITIONAL SHOWERS AND THUNDERSTORMS AROUND THE AREA FRIDAY THROUGH
FRIDAY EVENING. GUSTY OUTFLOW WINDS TO 40 MPH AND LIGHTNING CAN BE
EXPECTED WITH STORMS WHICH PASS NEAR THE FIRE AREA, AND HEAVY RAIN
WILL BE POSSIBLE WITH THE STRONGEST STORMS. AWAY FROM OUTFLOWS,
GUSTY SOUTHWEST WINDS WILL SURFACE BY MIDDAY WITH GUSTS INTO THE 20
MPH RANGE. WITH THIS SYSTEM PASSING THROUGH THE REGION, DAYTIME RH
WILL REMAIN ELEVATED ABOVE 40 PERCENT.
FOR SATURDAY, A COOLER AND MORE STABLE AIRMASS WILL SETTLE OVER THE
FIRE AREA UNDER A GENERAL WESTERLY FLOW ALOFT. THIS WILL ALLOW
DAYTIME TEMPERATURES TO TREND SEVERAL DEGREES COOLER. DAYTIME RH
WILL TREND LOWER, HOWEVER LINGERING MOISTURE WILL ALLOW FOR A SMALL
CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS.
FOR SUNDAY, HIGH PRESSURE WILL BUILD OVER THE AREA ALLOWING FOR A
WARMING AND DRYING TREND. WITH THIS HIGH IN PLACE, WINDS WILL REMAIN
GENERALLY TERRAIN DRIVEN THROUGH THE DAY UNDER MOSTLY SUNNY SKIES.
FOR MONDAY, HIGH PRESSURE WILL BEGIN TO MOVE EAST ALLOWING
SOUTHWESTERLY FLOW TO SPREAD OVER THE AREA. THIS WILL BRING A SLIGHT
WARMING TREND WHILE THE AIRMASS REMAINS FAIRLY DRY. MOISTURE ALOFT
WITHIN THIS FLOW WILL BRING A SLIGHT CHANCE OF AFTERNOON SHOWERS AND
THUNDERSTORMS.
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS, MAINLY DURING THE AFTERNOON.
CWR.................30 PERCENT.
CHANCE OF PCPN......50 PERCENT.
CHANCE OF LIGHTNING.30 PERCENT.
MAX TEMPERATURE.....75-80.
MIN HUMIDITY........45-55 PERCENT.
WIND (20 FT)........SOUTH 4-9 MPH WITH GUSTS 15-20 MPH, BECOMING
SOUTHWEST 7-12 MPH WITH GUSTS 20-25 MPH AFTER
1200. GUSTY OUTFLOW WINDS TO 40 MPH NEAR
THUNDERSTORMS.
MIXING HEIGHT.......RISING TO AROUND 7000 FT AGL (60-70TH PERCENTILE).
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
FRIDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS, MAINLY DURING THE EVENING.
CWR.................10 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF LIGHTNING.20 PERCENT.
MIN TEMPERATURE.....48-55.
MAX HUMIDITY........75-90 PERCENT.
WIND (20 FT)........SOUTHWEST 4-9 MPH WITH GUSTS TO 20 MPH,
BECOMING NORTHWEST 3-7 MPH AFTER 2400.
GUSTY OUTFLOW WINDS NEAR THUNDERSTORMS.
MIXING HEIGHT.......FALLING TO AROUND 500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 15 MPH.
SATURDAY
SKY/WEATHER.........MOSTLY SUNNY UNTIL 1200, THEN PARTLY CLOUDY WITH
A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
CWR.................5 PERCENT.
CHANCE OF PCPN......15 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....68-75.
MIN HUMIDITY........35-45 PERCENT.
WIND (20 FT)........WEST 3-7 MPH INCREASING TO 6-10 MPH WITH GUSTS
15-20 MPH DURING THE AFTERNOON. GUSTY OUTFLOW
WINDS TO 30 MPH NEAR THUNDERSTORMS.
MIXING HEIGHT.......RISING TO AROUND 6000 FT AGL (50-60TH PERCENTILE).
TRANSPORT WINDS.....WEST 10 TO 15 MPH.
SATURDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....38-45.
MAX HUMIDITY........50-60 PERCENT.
WIND (20 FT)........TERRAIN-DRIVEN 3-7 MPH. RIDGELINE WINDS WEST
AROUND 5 MPH.
MIXING HEIGHT.......FALLING TO AROUND 500 FT AGL.
TRANSPORT WINDS.....WEST 10 MPH.
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....70-78.
MIN HUMIDITY........25-35 PERCENT.
WIND (20 FT)........TERRAIN DRIVEN 3-8 MPH. RIDGELINE WINDS WEST
4-8 MPH.
MIXING HEIGHT.......RISING TO AROUND 6000 FT AGL (50-60TH PERCENTILE).
TRANSPORT WINDS.....WEST 8 TO 15 MPH.
SUNDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....42-48.
MAX HUMIDITY........40-50 PERCENT.
WIND (20 FT)........TERRAIN-DRIVEN 3-7 MPH. RIDGELINE WINDS WEST
AROUND 5 MPH.
MIXING HEIGHT.......FALLING TO AROUND 500 FT AGL.
TRANSPORT WINDS.....WEST 5 MPH.
MONDAY
SKY/WEATHER.........PARTLY CLOUDY WITH A SLIGHT CHANCE OF AFTERNOON
SHOWERS AND THUNDERSTORMS.
CWR.................10 PERCENT.
CHANCE OF PCPN......20 PERCENT.
CHANCE OF LIGHTNING.10 PERCENT.
MAX TEMPERATURE.....73-80.
MIN HUMIDITY........25-35 PERCENT.
WIND (20 FT)........TERRAIN DRIVEN 3-8 MPH. RIDGELINE WINDS SOUTHWEST
4-8 MPH.
MIXING HEIGHT.......RISING TO AROUND 7000 FT AGL (60-70TH PERCENTILE).
TRANSPORT WINDS.....SOUTHWEST 5-10 MPH.
FORECASTER...SEAMAN
REQUESTED BY...SIERRA SAMPSON
TYPE OF REQUEST...WILDFIRE
.TAG 2622081.0/SLC
.DELDT 09/17/26
.FORMATTERVERSION 2.0.0
.EMAIL SIERRA.SAMPSON@USDA.GOV
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