530
FNUS75 KBYZ 200245
FWSBYZ
SPOT FORECAST FOR EAST RIVER...USWFS
NATIONAL WEATHER SERVICE BILLINGS MT
845 PM MDT TUE MAY 19 2026
FORECAST IS BASED ON FORECAST START TIME OF 2100 MDT ON MAY 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH
THIS FORECAST.
DISCUSSION
EXPECT A POOR RH RECOVERY TONIGHT WITH A PERIOD OF GUSTY RIDGETOP
WINDS BETWEEN 9PM AND 3AM. TOMORROW WILL BE WARMER AND DRIER THAN
TODAY, WITH AFTERNOON RHS DROPPING TO THE TEENS. A COLD FRONT IS
EXPECTED TO ARRIVE WEDNESDAY EVENING BEFORE SUNSET (6-8PM),
BRINGING A SHIFT TO BREEZY NORTH WINDS AND A FEW SHOWERS AND WEAK
THUNDERSTORMS. THE GREATER POTENTIAL FOR PRECIPITATION IS THURSDAY
(20% CHANCE OF A WETTING RAIN).
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....37-41.
MAX HUMIDITY........48-52 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHEAST TO SOUTH 5-15 MPH.
RIDGETOP...........SOUTH 10-20 MPH. GUSTS TO 30 MPH BETWEEN 9PM
AND 3AM.
MIXING HEIGHT.......500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTH 13 MPH.
WEDNESDAY
SKY/WEATHER.........PARTLY SUNNY. ISOLATED SHOWERS AFTER 4PM.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....69-73.
MIN HUMIDITY........15-19 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH 5-10 MPH IN THE MORNING BECOMING NORTHWEST
IN THE AFTERNOON.
RIDGETOP...........SOUTH TO SOUTHWEST AROUND 10 MPH BECOMING
NORTHWEST IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 11000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 10 MPH BECOMING NORTHWEST.
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
WEAK THUNDERSTORMS. ERRATIC WIND GUSTS POSSIBLE
NEAR STORMS.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.10 PERCENT.
MIN TEMPERATURE.....39-43.
MAX HUMIDITY........78-82 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST TO NORTH 10-15 MPH. GUSTS TO 25 MPH
IN THE EVENING.
RIDGETOP...........NORTHWEST TO NORTH 10-20 MPH. GUSTS TO 30 MPH
IN THE EVENING.
MIXING HEIGHT.......DECREASING TO 700 FT AGL OVERNIGHT.
TRANSPORT WINDS.....NORTH 20 MPH DECREASING TO 10 MPH.
FORECASTER...LESTER
REQUESTED BY...BRETT STEFFEN
TYPE OF REQUEST...WILDFIRE
.TAG 2614086.0/BYZ
.DELDT 05/19/26
.FORMATTERVERSION 2.0.0
.EMAIL MTMCC@FIRENET.GOV
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