959
FNUS73 KGRR 281342
FWSGRR

Spot Forecast for SER 439S...USFS
National Weather Service Grand Rapids MI
942 AM EDT Mon Sep 28 2026

Forecast is based on ignition time of 1200 EDT on September 28.
If conditions become unrepresentative, contact the National Weather
Service.

Please contact our office at (616) 949-5150, if you have questions
or concerns with this forecast.

.DISCUSSION...
High pressure will bring fair and dry weather today and Tuesday
with light winds. Relative humidity will drop to around 50 percent
this afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
Temperature.........67 at ignition...Max 74.
RH..................63 percent at ignition...Min 51 percent.
Wind (20 ft)........Winds northeast at 3 mph at
                    ignition...otherwise Light winds becoming
                    northwest 5 to 6 mph late in the afternoon.
Mixing height.......2600 ft AGL at ignition...otherwise 4500 ft
                    AGL.
Mixing winds........North 7 to 9 mph.
Smoke dispersal.....180 /fair/ at ignition. Max...360 /good/.

TIME (EDT)      NOON   2 PM   4 PM   6 PM   8 PM   10 PM
Sky (%).........4      2      5      4      10     20
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............67     72     74     71     62     58
RH..............63     53     51     57     78     90
20 ft wind......NE 3   N 3    NW 5   NW 6   NW 5   N 2
20 ft wind gust.9      10     13     15     13     7
Mix hgt (ft)....2600   4300   4300   2000   400    400
Mixing wind.....NE 7   N 7    N 8    N 12   NW 8   N 8
Smoke disprsl...180    300    350    230    30     30

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent) then becoming
                    mostly cloudy (45-55 percent) then becoming
                    partly cloudy (45-55 percent).
Temperature.........Min 48.
RH..................Max 100 percent.
Wind (20 ft)........Northwest winds 5 to 6 mph becoming light.
Mixing height.......400 ft AGL.
Mixing winds........North 7 to 12 mph shifting to the east around 5
                    mph after 3 am.
Smoke dispersal.....230 (fair) early in the evening decreasing to
                    20 (poor) late in the night.

.TUESDAY...

Sky/weather.........Partly sunny (50-60 percent) then becoming
                    mostly sunny (30-40 percent).
Temperature.........Max 73.
RH..................Min 57 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 7 mph in
                    the afternoon.
Mixing height.......3600 ft AGL.
Mixing winds........Southeast 3 to 6 mph shifting to the southwest
                    6 to 13 mph in the late morning and afternoon.
Smoke dispersal.....10 (poor) early in the morning increasing to
                    420 (good) in the afternoon.

$$
Forecaster...Ostuno
Requested by...Kory Borgman
Type of request...PRESCRIBED
.TAG 2622654.0/GRR
.DELDT 09/28/26
.FormatterVersion 2.0.0
.EMAIL kory.borgman@usda.gov