063
FNUS75 KBOI 211009
FWSBOI
SPOT FORECAST FOR COLD RX - SCIRIUS...USFS
NATIONAL WEATHER SERVICE BOISE ID
409 AM MDT TUE APR 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0713 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.
...STRONG COLD FRONT TO ARRIVE THIS EVENING WITH SHOWERS AND
THUNDERSTORMS...
..WIDESPREAD RAIN AND SNOW ON WEDNESDAY
DISCUSSION
TODAY WILL BE WARM AND DRY WITH BREEZY AFTERNOON WINDS AHEAD OF A
COLD FRONT. THE FRONT WILL MOVE THROUGH THIS EVENING, BRINGING
SHOWERS, ISOLATED THUNDERSTORMS, AND SHIFTING WINDS. RAIN WILL
INCREASE LATE TONIGHT WITH ISOLATED THUNDERSTORMS CONTINUING.
COOLER TEMPERATURES WILL ALLOW RAIN TO MIX WITH OR CHANGE TO SNOW
BY WEDNESDAY MORNING, BUT LITTLE TO NO SNOW ACCUMULATION IS
EXPECTED AT THE BURN SITE. MUCH COOLER TEMPERATURES WILL ARRIVE ON
WEDNESDAY. LIGHTER RAIN AND SNOW WILL LINGER INTO THURSDAY.
TEMPERATURES WILL REMAIN COOL THROUGH THE WEEKEND WITH LOWER
CHANCES OF RAIN AND SNOW.
TODAY (TUESDAY)
SKY/WEATHER.........SUNNY IN THE MORNING WITH INCREASING CLOUDS
IN THE AFTERNOON.
MAX TEMPERATURE.....66 TO 71.
MIN HUMIDITY........20 TO 25 PERCENT.
CWR.................0 PERCENT.
WIND - 20 FOOT......NORTH 2 TO 5 MPH IN THE MORNING, BECOMING SOUTH
3 TO 8 MPH AFTER 1000L. GUSTS UP TO 15 MPH IN THE
AFTERNOON.
MIXING HEIGHT.......6000 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 15 MPH.
VENTILATION INDEX...900 EXCELLENT.
TONIGHT
SKY/WEATHER.........A 25% CHANCE OF THUNDERSTORMS IN THE EVENING AND
OVERNIGHT. STORMS CAPABLE OF ERRATIC GUSTY WINDS,
SMALL HAIL, HEAVY DOWNPOURS, AND ISOLATED LIGHTNING
STRIKES. SCATTERED RAIN SHOWERS IN THE EVENING,
THEN WIDESPREAD RAIN AFTER 0300L. CHANCE OF
PRECIPITATION 40 PERCENT IN THE EVENING, INCREASING
TO 90 PERCENT AFTER 0300L.
MIN TEMPERATURE.....35 TO 40.
MAX HUMIDITY........95 TO 100 PERCENT.
CWR.................60 PERCENT.
WIND - 20 FOOT......NORTH TO NORTHEAST 3 TO 6 MPH WITH IN THE EVENING
SHIFTING TO THE SOUTH 5 TO 10 MPH WITH GUSTS TO
AROUND 20 MPH OVERNIGHT. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 15 MPH.
VENTILATION INDEX...75 POOR.
WEDNESDAY
SKY/WEATHER.........RAIN AND SNOW SHOWERS. A SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON. CHANCE OF
PRECIPITATION NEAR 100 PERCENT. SNOW LEVEL 5300 FEET.
SNOW ACCUMULATION LESS THAN 1 INCH.
MAX TEMPERATURE.....37 TO 42.
MIN HUMIDITY........85 TO 90 PERCENT.
CWR.................90 PERCENT.
WIND - 20 FOOT......SOUTHWEST AROUND 4 TO 8 MPH. GUSTS UP TO 14 MPH IN
THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS.
MIXING HEIGHT.......2500 FT AGL.
TRANSPORT WINDS.....WEST AROUND 15 MPH.
VENTILATION INDEX...375 FAIR.
FORECASTER...TANGEN
REQUESTED BY...JONATHAN MILLER
TYPE OF REQUEST...PRESCRIBED
.TAG 2610807.1/BOI
.DELDT 04/21/26
.FORMATTERVERSION 2.0.0
.EMAIL JONATHAN.MILLER@USDA.GOV,WILL.WOODS@USDA.GOV
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