315
FNUS75 KBOI 201229
FWSBOI
SPOT FORECAST FOR COLD RX - SCIRIUS...USFS
NATIONAL WEATHER SERVICE BOISE ID
629 AM MDT MON APR 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON APRIL 20.
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 TODAY AND TUESDAY COMPARED TO PREVIOUS
DAYS, WITH AFTERNOON RIDGE BREEZES 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 AND STRONG GUSTY WINDS
TO THE SITE TUESDAY EVENING/NIGHT. AFTER MIDNIGHT (WED AM), RAIN WILL
BECOME CONTINUOUS, THEN TRANSITION TO SNOW/MIX WEDNESDAY MORNING AS
TEMPERATURES BECOME SIGNIFICANTLY COLDER.
TODAY (MONDAY)
SKY/WEATHER.........MOSTLY CLOUDY, BECOMING PARTLY CLOUDY.
MAX TEMPERATURE.....65 TO 70. WARMER.
MIN HUMIDITY........17 TO 24 PERCENT.
CWR.................0 PERCENT.
WIND - 20 FOOT......NORTHERLY AROUND 3 MPH EARLY IN THE MORNING
SHIFTING TO THE SOUTH 3 TO 6 MPH IN THE
AFTER 1200L. OCCASIONAL GUSTS AROUND 12 MPH.
MIXING HEIGHT.......5000 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 15 MPH.
VENTILATION INDEX...750 EXCELLENT.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY.
MIN TEMPERATURE.....40 TO 45.
MAX HUMIDITY........58 TO 65 PERCENT.
CWR.................0 PERCENT.
WIND - 20 FOOT......SOUTHWEST 3 TO 5 MPH EARLY EVENING SHIFTING TO
NORTHERLY AROUND 4 MPH AFTER SUNSET.
MIXING HEIGHT.......100 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 5 MPH.
VENTILATION INDEX...5 POOR.
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY, THEN MOSTLY CLOUDY. A 60 PERCENT
CHANCE OF RAIN SHOWERS AFTER 1800L. SHOWER ACTIVITY
WILL BE CAPABLE OF ERRATIC GUSTY WINDS, SMALL HAIL,
MODERATE/HEAVY DOWNPOURS, AND ISOLATED LIGHTNING STRIKES.
MAX TEMPERATURE.....64 TO 69.
MIN HUMIDITY........25 TO 30 PERCENT.
CWR.................0 PERCENT, INCREASING TO 40 PERCENT AFTER 1800L.
WIND - 20 FOOT......SOUTH 3 TO 8 MPH AFTER 1000L. GUSTS AROUND
15 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7000 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 15 MPH.
VENTILATION INDEX...1050 EXCELLENT.
FORECASTER...HENRY
REQUESTED BY...JONATHAN MILLER
TYPE OF REQUEST...PRESCRIBED
.TAG 2610807.0/BOI
.DELDT 04/20/26
.FORMATTERVERSION 2.0.0
.EMAIL JONATHAN.MILLER@USDA.GOV,WILL.WOODS@USDA.GOV
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