871
FNUS75 KMSO 200219
FWSMSO

Spot Forecast for Macallister Fire
National Weather Service Missoula MT
819 PM MDT Tue Aug 19 2025

Forecast is based on forecast start time of 2200 MDT on August 19.
If conditions become unrepresentative...contact the National Weather
Service.

...RED FLAG WARNING IN EFFECT FROM 1 PM TO 10 PM MDT WEDNESDAY...

.DISCUSSION...South winds continue overnight with only modest Rh
recovery. Wednesday will be hot and dry once again, it will be
very unstable with deep mixing and gusty southwesterly winds thus
critical fire weather conditions are expected. There is a slight
chance of showers and thunderstorms on Wednesday afternoon with
gusty, erratic winds a concern.

Winds shift to northerly on Wednesday night and continue for
several days. Daytime temperatures cool on Thursday with somewhat
improved min Rh.


.REST OF TONIGHT...

* Sky/Weather.........Mostly clear.
* CWR (> 0.10 Inch)...0 percent.
* Chance Lightning....0 percent.
* Min Temperature.....57-62.
* Max Humidity........40-45 percent.
* Wind (20 ft)........South to southwest 10-16 mph.
* Mixing Height.......500 ft agl.
* Mixing Winds........South 15 mph.
* Precip Amount.......0.00 inches.

.WEDNESDAY...

* Sky/Weather.........Partly cloudy. Slight chance of showers and
  thunderstorms in the afternoon.
* CWR (> 0.10 Inch)...10 percent.
* Chance Lightning....15 percent.
* Max Temperature.....86-91.
* Min Humidity........21-26 percent.
* Wind (20 ft)........South 8-13 mph shifting to the southwest
  9-15 mph in the afternoon. Gusts to 30 mph in the afternoon.
* Mixing Height.......2000 ft agl increasing to 14000 ft agl in
  the afternoon.
* Mixing Winds........Southwest 15 mph.
* Precip Amount.......0.00-0.15 inches.

.WEDNESDAY NIGHT...

* Sky/Weather.........Partly cloudy.
* CWR (> 0.10 Inch)...0 percent.
* Chance Lightning....0 percent.
* Min Temperature.....52-57.
* Max Humidity........71-76 percent.
* Wind (20 ft)........North 6-13 mph.
* Mixing Height.......1000 ft agl decreasing to 500 ft agl in the
  late evening and overnight.
* Mixing Winds........North 10 mph.
* Precip Amount.......0.00 inches.

.THURSDAY...

* Sky/Weather.........Mostly sunny.
* CWR (> 0.10 Inch)...0 percent.
* Chance Lightning....0 percent.
* Max Temperature.....78-83.
* Min Humidity........28-33 percent.
* Wind (20 ft)........Northwest 6-7 mph shifting to the north
  around 10 mph in the afternoon. Gusts to 17 mph in the
  afternoon.
* Mixing Height.......3000 ft agl increasing to 8500 ft agl in the
  afternoon.
* Mixing Winds........Northwest 10 mph.
* Precip Amount.......0.00 inches.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Mostly clear. Lows 49-54. Highs 76-81. North winds 6-15 mph.
.SATURDAY...
Mostly clear. Lows 47-52. Highs 78-83. North winds 6-15 mph.
.SUNDAY...
Partly cloudy. Lows 50-55. Highs 79-84. North winds 6-13 mph.

$$
Forecaster...Booth
Requested by...Bob Culbreth
Type of request...WILDFIRE
.TAG 2520121.2/MSO
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL bob.culbreth@mt.gov