219
FNUS75 KGJT 152224
FWSGJT
SPOT FORECAST FOR DERBY...UPPER COLORADO FIRE MANAGEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
424 PM MDT MON SEP 15 2025
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON SEPTEMBER 15.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ISOLATED TO SCATTERED SHOWERS IN THE MORNING TUESDAY
BECOMING SCATTERED THUNDERSTORMS THROUGH THE AFTERNOON AND
EVENING WITH THE BEST CHANCES FOR WETTING RAIN THROUGH THE EVENING
AND OVERNIGHT. WEDNESDAY WILL SEE MORE SHOWERS AND THUNDERSTORMS.
THE PRIMARY THREATS FROM THUNDERSTORMS ARE LIGHTNING, HEAVY RAIN
AND GUSTS 40-50 MPH. THERE ARE NO FIRE WEATHER CONCERNS THROUGH
THE PERIOD AT THIS TIME.
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (45-55 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....38-43.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........WEST WINDS 10 MPH.
SMOKE DISPERSAL.....FAIR DECREASING TO POOR (0 KNOT-FT) OVERNIGHT.
MIXING HEIGHT.......4200 FT AGL DECREASING TO 0 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 11 MPH.
CHANCE OF THUNDER...0 PERCENT.
TUESDAY
SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE MORNING, THEN CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
CWR.................10 PERCENT.
MAX TEMPERATURE.....53-58.
MIN HUMIDITY........28-33 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 10 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
MIXING HEIGHT.......4000 FT AGL INCREASING TO 8500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 17 MPH.
CHANCE OF THUNDER...30 PERCENT.
TUESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT). RAIN SHOWERS
LIKELY AND CHANCE OF THUNDERSTORMS IN THE
EVENING, THEN CHANCE OF RAIN SHOWERS OVERNIGHT.
CWR.................30 PERCENT.
MIN TEMPERATURE.....33-38.
MAX HUMIDITY........72-77 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS IN THE EVENING.
SMOKE DISPERSAL.....FAIR DECREASING TO POOR (0 KNOT-FT) OVERNIGHT.
MIXING HEIGHT.......3600 FT AGL DECREASING TO 0 FT AGL OVERNIGHT.
TRANSPORT WINDS.....NORTHWEST 10 MPH.
CHANCE OF THUNDER...30 PERCENT.
WEDNESDAY
SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE MORNING, THEN CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
CWR.................20 PERCENT.
MAX TEMPERATURE.....45-50.
MIN HUMIDITY........48-53 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (15000-34000 KNOT-FT).
MIXING HEIGHT.......3800 FT AGL.
TRANSPORT WINDS.....NORTHWEST 10 MPH.
CHANCE OF THUNDER...40 PERCENT.
FORECAST DAYS 3 THROUGH 5
THURSDAY
PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE LOWER 50S. NORTH
WINDS 5 MPH.
FRIDAY
MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE MID 50S. WEST
WINDS 5 MPH.
SATURDAY
PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE MID 50S. WEST
WINDS 10 MPH.
FORECASTER...DAVID BYERS
REQUESTED BY...BRIAN OKARSKI
TYPE OF REQUEST...WILDFIRE
.TAG 2521931.2/GJT
.DELDT 09/15/25
.FORMATTERVERSION 2.0.0
.EMAIL BOKARSKI@BLM.GOV,MPFEIFER@BLM.GOV
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