FNUS76 KOTX 051135

FWSOTX



Spot Forecast for St. Joe Divide Rx...USFS

National Weather Service Spokane WA

435 AM PDT Tue May 5 2026



Forecast is based on ignition time of 0600 PDT on May 05. 

If conditions become unrepresentative, contact the National Weather

Service.

***************************************************************

Forecasts for 20 foot wind speeds (valleys and ridge tops) are

10 minute averages reflecting RAWS wind.

***Ventilation Index is derived from transport wind

   multiplied by the mixing height divided by 100.

   Categories: low (< 200), moderate (200-500), 

   high (500-800), and very high (> 800). 

***************************************************************



.DISCUSSION...



Dry, northeast winds will occur at the burn site today with the

strongest gusts on ridgetops.  Tonight winds will decouple and 

becoming downslope/downvalley early in the evening with stronger

ridgetop winds out of the east.  Winds will lighter on Wednesday,

with terrain driven upslope/upvalley winds.



.TODAY...



Sky/weather.........Mostly sunny. 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Max temperature.....53 top of unit...62 bottom. 

Min humidity........27-32 percent. 

Wind (20 ft)........Northeast winds 4 to 9 mph, except 8 to 

                    15 mph with gusts up to 22 mph on

                    ridgetops.

Mixing height.......Near surface through 0800 increasing to

                    6000 feet AGL in the afternoon. 

Transport winds.....Northeast around 15 mph. 



.TONIGHT...



Sky/weather.........Mostly clear. 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Min temperature.....37-44. 

Max humidity........50-65 percent. 

Wind (20 ft)........Downslope/downvalley 2 to 6 mph, except

                    east 5 to 12 mph on ridgetops. 

Mixing height.......Falling to near surface by 2000. 

Transport winds.....East 5 to 12 mph. 



.WEDNESDAY...



Sky/weather.........Sunny. 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Max temperature.....59 top of unit...69 bottom. 

Min humidity........32-37 percent. 

Wind (20 ft)........Upslope/upvalley 3 to 7 mph. 

Mixing height.......Near surface through 0830 increasing to 6000 ft 

                    AGL in the afternoon. 

Transport winds.....South around 8 mph shifting to the west around 

                    15 mph in the afternoon. 



$$

Forecaster...JW

Requested by...Marshall Myhre

Type of request...PRESCRIBED

.TAG 2612629.1/OTX

.DELDT 05/05/26

.FormatterVersion 2.0.0

.EMAIL marshall.myhre@usda.gov