FNUS75 KMSO 181334

FWSMSO



Spot Forecast for Grey Fire

National Weather Service Missoula MT

734 AM MDT Sat Jul 18 2026



Forecast is based on forecast start time of 0800 MDT on July 18. 

If conditions become unrepresentative...contact the National Weather

Service.



.DISCUSSION...Thunderstorms are in the forecast again for today.

Timing at the burn site is between 1600 and 2000 MDT, though if

the pattern from the last few days persists it will be closer to

the first part of that window. If the fire takes a direct hit from

a thunderstorm, high resolution models are showing a peak wind

gust from the west to northwest is most likely in the 50-60 mph

range.



The timing of storms falls close to the break between the rest of

today and the tonight forecast period, so high chance of lightning

and CWR in each of those sections represents uncertainty in the

timing of when storms will arise and NOT two different events.



.REST OF TODAY...



* Sky/Weather.........Thunderstorms in the afternoon. 

* CWR (> 0.10 Inch)...20 percent. 

* Chance Lightning....40 percent. 

* Max Temperature.....81-86. 

* Min Humidity........20-25 percent. 

* Wind (20 ft)........Variable 2-4 mph becoming west 5-7 mph in the 

  afternoon. 

* Precip Amount.......0.03 to 0.21 inches. 



.TONIGHT...



* Sky/Weather.........Partly cloudy. Chance of showers and 

  thunderstorms in the evening. 

* CWR (> 0.10 Inch)...45 percent. 

* Chance Lightning....40 percent. 

* Min Temperature.....52-57. 

* Max Humidity........59-64 percent. 

* Wind (20 ft)........West around 5 mph in the evening becoming 

  variable 2-4 mph. 

* Precip Amount.......0.03 to 0.21 inches. 



.SUNDAY...



* Sky/Weather.........Mostly sunny. 

* CWR (> 0.10 Inch)...0 percent. 

* Chance Lightning....0 percent. 

* Max Temperature.....80-85. 

* Min Humidity........15-20 percent. 

* Wind (20 ft)........Variable 3-6 mph becoming west 9-12 mph in 

  the afternoon. 

* Precip Amount.......0.00 inches. 



$$

Forecaster...Leach

Requested by...Shane Martin

Type of request...WILDFIRE

.TAG 2617660.0/MSO

.DELDT 07/18/26

.FormatterVersion 2.0.0

.EMAIL shane.martin@usda.gov