603
FNUS75 KBOI 201607
FWSBOI
SPOT FORECAST FOR 2026 TUMBLEWEED RX...BUREAU OF LAND MANAGEMENT- TWIN FALLS
NATIONAL WEATHER SERVICE BOISE ID
1007 AM MDT MON APR 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON APRIL 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE AT (208)334-9060, IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
..WARM AND DRY THROUGH TUESDAY
..STRONG, WET COLD FRONT TUESDAY NIGHT AND WEDNESDAY
DISCUSSION
TEMPERATURES WILL TREND WARMER TUESDAY COMPARED TO PREVIOUS DAYS,
WITH AFTERNOON INCREASED WINDS EXPECTED. A STRONG COLD FRONT WILL
ARRIVE LATE TUESDAY, WITH SHOWER ACTIVITY INCREASING AFTER 1800L
TUESDAY. THE COLD FRONT WILL ALSO BRING A THREAT OF LIGHTNING (5
TO 10 PERCENT CHANCE) AND STRONG GUSTY WINDS TO THE SITE TUESDAY
EVENING/NIGHT AND WEDNESDAY. AFTER MIDNIGHT (WED AM), RAIN WILL
BECOME CONTINUOUS.
TUESDAY
SKY/WEATHER.........PARTLY SUNNY.
MAX TEMPERATURE.....79 TO 84.
MIN HUMIDITY........16 TO 21 PERCENT.
CWR.................0 PERCENT.
WIND - 20 FOOT......SOUTH 11 TO 17 MPH. BRIEF WIND SHIFT TO EAST-SOUTHEAST
LATE MORNING. GUSTS UP TO 20 MPH EARLY IN THE MORNING,
INCREASING TO 30 MPH IN THE AFTERNOON.
MIXING HEIGHT.......14000 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 30 MPH.
VENTILATION INDEX...4200 EXCELLENT.
TUESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY. A 50 PERCENT CHANCE OF SHOWERS IN THE
EVENING, THEN A 70 PERCENT CHANCE OF SHOWERS OVERNIGHT.
CHANCE OF THUNDERSTORMS 5 TO 10 PERCENT.
MIN TEMPERATURE.....40 TO 45.
MAX HUMIDITY........81 TO 86 PERCENT.
CWR.................50 PERCENT.
WIND - 20 FOOT......SOUTHERLY 15 TO 20 MPH WITH GUSTS TO 30 MPH, SHIFTING
TO WEST-SOUTHWEST 15 TO 20 MPH WITH GUSTS TO 30 MPH.
MIXING HEIGHT.......1000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 30 MPH.
VENTILATION INDEX...300 FAIR.
WEDNESDAY
SKY/WEATHER.........RAIN SHOWERS. CHANCE OF SHOWERS 90 PERCENT. CHANCE OF
THUNDERSTORMS 5 TO 10 PERCENT.
MAX TEMPERATURE.....51 TO 56.
MIN HUMIDITY........64 TO 69 PERCENT.
CWR.................60 PERCENT.
WIND - 20 FOOT......WEST 16 TO 22 MPH. GUSTS UP TO 30 MPH IN THE
MORNING INCREASING TO 35 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7000 FT AGL.
TRANSPORT WINDS.....WEST AROUND 35 MPH.
VENTILATION INDEX...2500 EXCELLENT.
FORECASTER...HOOD
REQUESTED BY...ADAM HARDY
TYPE OF REQUEST...PRESCRIBED
.TAG 2610864.0/BOI
.DELDT 04/21/26
.FORMATTERVERSION 2.0.0
.EMAIL AHARDY@BLM.GOV
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