203
FNUS75 KGJT 172335
FWSGJT
SPOT FORECAST FOR DERBY...UPPER COLORADO FIRE MANAGEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
535 PM MDT WED SEP 17 2025
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON SEPTEMBER 17.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A SLIGHT CHANCE OF A SHOWER OR THUNDERSTORM NEAR THE
FIRE LOCATION WILL LINGER THROUGH THE NEXT 2-4 HOURS, BEFORE SKIES
CLEAR OUT. WINDS WILL BE LIGHT AND TERRAIN DRIVEN THROUGH THURSDAY.
INCREASING MOISTURE AND AN APPROACHING SYSTEM WILL BRING INCREASING
CLOUDS, SHOWERS, AND STRONGER WESTERLY TO SOUTHWESTERLY WINDS
THURSDAY NIGHT INTO FRIDAY. NO CRITICAL FIRE WEATHER CONDITIONS ARE
ANTICIPATED.
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT). SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS UNTIL 2100.
CWR.................0 PERCENT.
MIN TEMPERATURE.....30-35.
MAX HUMIDITY........66-71 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 8-12 MPH BECOMING NORTH WINDS
4-8 MPH BY 2400. GUSTS UP TO 20 MPH POSSIBLE
UNTIL 2100. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS.
SMOKE DISPERSAL.....POOR (0-31000 KNOT-FT).
MIXING HEIGHT.......3100 FT AGL DECREASING TO 0 FT AGL BY 1900.
TRANSPORT WINDS.....NORTH 10 MPH.
CHANCE OF THUNDER...15 PERCENT.
THURSDAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....49-54.
MIN HUMIDITY........30-35 PERCENT.
WIND (20 FT)........NORTH WINDS 4-8 MPH BECOMING EAST WINDS 3-5 MPH
BY 0900, THEN BECOMING SOUTHEAST WINDS 4-8 MPH
BY 1200.
SMOKE DISPERSAL.....POOR (0-31000 KNOT-FT).
MIXING HEIGHT.......0 FT AGL INCREASING TO 5200 FT AGL BY 1500.
TRANSPORT WINDS.....NORTHWEST 10 MPH.
CHANCE OF THUNDER...0 PERCENT.
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....35-40.
MAX HUMIDITY........41-46 PERCENT.
WIND (20 FT)........EAST WINDS 4-8 MPH SHIFTING TO THE NORTHWEST BY
2100.
SMOKE DISPERSAL.....POOR (0-17000 KNOT-FT).
MIXING HEIGHT.......2800 FT AGL DECREASING TO 0 FT AGL BY 1900.
TRANSPORT WINDS.....WEST 10 MPH.
CHANCE OF THUNDER...0 PERCENT.
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT) AFTER 1200.
CWR.................0 PERCENT.
MAX TEMPERATURE.....54-59.
MIN HUMIDITY........20-25 PERCENT.
WIND (20 FT)........WEST WINDS 4-8 MPH SHIFTING TO THE SOUTHWEST BY
0800.
SMOKE DISPERSAL.....POOR (0-27000 KNOT-FT) INCREASING TO FAIR BY
1200, AND TO GOOD BY 1400. DECREASING BACK TO
FAIR BY 1600, AND TO POOR (7000-25000 KNOT-FT)
BY 1700.
MIXING HEIGHT.......0 FT AGL INCREASING TO 6800 FT AGL BY 1500.
DECREASING THROUGH THE AFTERNOON TO 2800 FT
AGL.
TRANSPORT WINDS.....WEST 11 MPH.
CHANCE OF THUNDER...0 PERCENT.
FORECASTER...BRIANNA BEALO
REQUESTED BY...BRIAN OKARSKI
TYPE OF REQUEST...WILDFIRE
.TAG 2521931.4/GJT
.DELDT 09/17/25
.FORMATTERVERSION 2.0.0
.EMAIL MPFEIFER@BLM.GOV,BOKARSKI@BLM.GOV
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