745
FNUS75 KBOI 212327
FWSBOI
SPOT FORECAST FOR CROOKED...USFS
NATIONAL WEATHER SERVICE BOISE ID
527 PM MDT FRI AUG 21 2026
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON AUGUST 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.
...RED FLAG WARNING IN EFFECT FROM NOON SATURDAY TO MIDNIGHT MDT
SATURDAY NIGHT FOR LIGHTNING....
..POSSIBLE STRONG OUTFLOW GUSTS THIS EVENING
DISCUSSION
PEAK OUTFLOW STRENGTH OUT OF SHOWERS THIS EVENING HAVE SHIFTED
DOWN TO 30 TO 50 MPH, BUT STRONGEST GUSTS WILL STILL OCCUR ALONG
RIDGES AND N-S VALLEYS. BEST TIME OF ARRIVAL IS STILL 1900 TO 2200
LT. WINDS MOSTLY CALM OVERNIGHT, BUT ISOLATED SHOWERS COULD FORM
THROUGH EARLY SATURDAY MORNING, CAPABLE OF PRODUCING STRONG WIND
GUSTS. A COLD FRONT TOMORROW DROPS TEMPERATURES ABOUT 10 DEGREES
FROM FRIDAY AND BRINGS AN INCREASED CHANCE OF THUNDERSTORMS.
THUNDERSTORMS SATURDAY EVENING COULD PRODUCE HEAVY RAINFALL,
ABUNDANT LIGHTNING, AND OUTFLOW WINDS 35 TO 45 MPH. A RED FLAG
WARNING WAS ISSUED TO COVER THE LIGHTNING AND OUTFLOW GUSTS
TOMORROW. STORM COVERAGE WILL BE MORE ISOLATED, BUT EACH STORM
SHOULD BE IN AN ENVIRONMENT FOR EFFICIENT LIGHTNING PRODUCTION.
FOLLOWING THE FRONT ON SUNDAY, SUSTAINED WINDS INCREASE TO 15 MPH
WITH GUSTS UP TO 25 MPH WHILE MINIMUM RHS ARE STILL 15 TO 20% EACH
AFTERNOON.
TONIGHT
SKY/WEATHER.........CLOUDY. A 20 PERCENT CHANCE OF SHOWERS AND
THUNDERSTORMS IN THE EVENING. SOME THUNDERSTORMS MAY
PRODUCE GUSTY WINDS IN THE EVENING.
MIN TEMPERATURE.....62 TO 67.
MAX HUMIDITY........47 TO 52 PERCENT.
CWR.................10 PERCENT.
WIND - 20 FOOT......SOUTHWEST 8 TO 10 MPH IN THE EVENING SHIFTING TO
THE NORTHEAST 4 TO 10 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS IN THE EVENING, UP TO
30 TO 50 MPH.
MIXING HEIGHT.......200 FT AGL.
TRANSPORT WINDS.....EAST AROUND 15 MPH.
VENTILATION INDEX...30 POOR.
SATURDAY
SKY/WEATHER.........PARTLY SUNNY. A 20 PERCENT CHANCE OF SHOWERS
AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....85 TO 91.
MIN HUMIDITY........18 TO 23 PERCENT.
CWR.................10 PERCENT.
WIND - 20 FOOT......EAST 5 TO 8 MPH IN THE MORNING SHIFTING TO THE
SOUTHWEST 10 TO 14 MPH WITH GUSTS TO AROUND 18
MPH IN THE AFTERNOON. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON WITH
OUTFLOW GUSTS UP TO 35 TO 45 MPH.
MIXING HEIGHT.......10500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
VENTILATION INDEX...1575 EXCELLENT.
SATURDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS IN THE EVENING, THEN MOSTLY
CLOUDY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS OVERNIGHT. CHANCE OF
PRECIPITATION 30 PERCENT.
MIN TEMPERATURE.....57 TO 62.
MAX HUMIDITY........53 TO 58 PERCENT.
CWR.................10 PERCENT.
WIND - 20 FOOT......SOUTHEAST 5 TO 10 MPH. GUSTS UP TO 16 MPH IN
THE EVENING. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS. SHIFTING TO EAST 5 TO 10 MPH
PREVAILING, ALIGNED WITH THE BOISE DRAINAGE THIS
COULD PRODUCE DOWNSLOPE WINDS 6 TO 12 MPH.
MIXING HEIGHT.......200 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH.
VENTILATION INDEX...10 POOR.
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....80 TO 86.
MIN HUMIDITY........15 TO 20 PERCENT.
CWR.................0 PERCENT.
WIND - 20 FOOT......SOUTHEAST 3 TO 6 MPH IN THE MORNING SHIFTING TO
THE SOUTHWEST 7 TO 11 MPH WITH GUSTS TO AROUND
18 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
VENTILATION INDEX...1125 EXCELLENT.
FORECASTER...MACFARLANE
REQUESTED BY...BOISE DISPATCH
TYPE OF REQUEST...WILDFIRE
.TAG 2620056.2/BOI
.DELDT 08/21/26
.FORMATTERVERSION 2.0.0
.EMAIL JOY.ABNER@USDA.GOV,IDBDC@FIRENET.GOV
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