FNUS75 KBOI 180933
FWSBOI

Spot Forecast for Railroad Rx...Payette NF
National Weather Service Boise ID
333 AM MDT Mon May 18 2026

Forecast is based on ignition time of 0600 MDT on May 18. 
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.

...COOL AND BREEZY WITH ISOLATED PM RAIN SHOWERS TODAY...

.DISCUSSION...
Northerly flow aloft will bring breezy northerly winds, cold 
temperatures, and isolated late afternoon showers today. Snow 
levels will increase to around 5000-6000 feet MSL this afternoon, 
keeping the dominant precipitation type rain at the burn area. 
Temperatures will drop below freezing on Tuesday morning, with 
good overnight relative humidity recoveries. Conditions will dry 
out on Tuesday, with terrain driven winds and a slight warming 
trend through the end of the week. 

.TODAY...

Sky/weather.........Partly cloudy. A 20 percent chance of rain showers
                    in the afternoon. 
Max temperature.....43 to 48. 
Min humidity........40 to 45 percent. 
CWR.................10 percent. 
Wind - 20 foot......Northwest 6 to 9 mph with gusts to around 18 mph. 
Mixing height.......7500 ft AGL. 
Transport winds.....North around 15 mph. 
Ventilation Index...1125 excellent. 

.TONIGHT...

Sky/weather.........Partly cloudy. 
Min temperature.....28 to 33. 
Max humidity........78 to 83 percent. 
CWR.................0 percent. 
Wind - 20 foot......Northwest 6 to 9 mph. Gusts up to 18 mph in the 
                    evening. 
Mixing height.......200 ft AGL. 
Transport winds.....North around 10 mph. 
Ventilation Index...20 poor. 

.TUESDAY...

Sky/weather.........Mostly sunny. 
Max temperature.....48 to 53. 
Min humidity........32 to 36 percent. 
CWR.................0 percent. 
Wind - 20 foot......East around 4 mph in the morning shifting 
                    to upslope winds around 6 mph in the afternoon. 
Mixing height.......8000 ft AGL. 
Transport winds.....West around 10 mph. 
Ventilation Index...800 excellent. 

$$
Forecaster...Adams
Requested by...Liz Winters
Type of request...PRESCRIBED
.TAG 2613781.1/BOI
.DELDT 05/18/26
.FormatterVersion 2.0.0
.EMAIL elizabeth.winters@usda.gov