203
FNUS75 KSLC 192004
FWSSLC
SPOT FORECAST FOR WEBER BASIN PILE RX...USFS
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
104 PM MST FRI DEC 19 2025
FORECAST IS BASED ON IGNITION TIME OF 1300 MST ON DECEMBER 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A COLD FRONT WILL SAG SOUTHWARD THIS AFTERNOON
THROUGH THE SPOT LOCATION, LIKELY ARRIVING WITH RAINFALL AND A
SHORT-LIVED WIND SWITCH TO NORTHWESTERLY BETWEEN 1500-1600 BEFORE
TRANSITIONING BACK TO BREEZY SOUTHERLIES AFTER 2-3 HOURS. A
SHALLOW INVERSION HAS DEVELOPED AND IS UNFORTUNATELY LIMITING
CLEARING INDEX TO UNDER 500, AS IT IS UNLIKELY THIS INVERSION WILL
MIX OUT THIS AFTERNOON...A CHANGE FROM PRIOR FORECASTS. TOMORROW
DOESN'T LOOK TO BE MUCH BETTER WITH LIGHTER WINDS DURING THE DAY
AND MORE STABLE CONDITIONS.
TODAY
SKY/WEATHER.........CLOUDY (90-100 PERCENT CLOUD COVER). CHANCE OF
RAIN EARLY IN THE AFTERNOON, THEN RAIN LIKELY
AFTER 1600.
CWR.................50 PERCENT.
CHANCE OF PCPN......90 PERCENT AFTER 1600.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....56-59.
MIN HUMIDITY........30-33 PERCENT.
WIND (20 FT)........SOUTH-SOUTHWEST WINDS 10-15 MPH BECOMING NORTHWEST
10-15 MPH WITH GUSTS TO 20 MPH AROUND 1600.
MIXING HEIGHT.......2400 FT AGL.
CLIMATOLOGY......10-20TH PERCENTILE.
TRANSPORT WINDS.....SOUTH AROUND 16 MPH.
CLEARING INDEX......400.
TONIGHT
SKY/WEATHER.........CLOUDY (90-100 PERCENT CLOUD COVER). RAIN LIKELY
THROUGH 2100, THEN CHANCE OF RAIN.
CWR.................60 PERCENT.
CHANCE OF PCPN......90 PERCENT BECOMING 30 PERCENT AFTER 2100.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....36-39.
MAX HUMIDITY........83-86 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 10-15 MPH. GUSTS UP TO 25 MPH.
MIXING HEIGHT.......1900 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 16 MPH.
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT CLOUD COVER).
CHANCE OF RAIN.
CWR.................30 PERCENT.
CHANCE OF PCPN......50 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....47-50.
MIN HUMIDITY........50-53 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 4-8 MPH.
MIXING HEIGHT.......2600 FT AGL.
CLIMATOLOGY......10-20TH PERCENTILE.
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH.
CLEARING INDEX......250.
FORECASTER...CUNNINGHAM
REQUESTED BY...BRANDON EVERETT
TYPE OF REQUEST...PRESCRIBED
.TAG 2527734.2/SLC
.DELDT 12/19/25
.FORMATTERVERSION 2.0.0
.EMAIL STEPHEN.HATFIELD@USDA.GOV,GARRETT.PITSENBARGER@USDA.GOV,BRANDON.EVERETT@USDA.GOV
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