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Spot Forecast
Issued by NWS Grand Rapids, MI

000
FNUS73 KGRR 150730
FWSGRR

Spot Forecast for Whelan Lake Block1 Partial 1...USFS
National Weather Service Grand Rapids MI
330 AM EDT Mon Apr 15 2024

Forecast is based on ignition time of 0800 EDT on April 15.
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...Sunny skies and 5-15 knot west winds are expected today.

.TODAY...

Sky/weather.........Sunny (15-25 percent).
Temperature.........41 at ignition...Max 63.
RH..................82 percent at ignition...Min 35 percent.
Wind (20 ft)........Winds southwest at 2 mph at
                    ignition...otherwise Light winds becoming
                    northwest 6 to 12 mph, then shifting to the
                    north around 10 mph in the evening.
Mixing height.......400 ft AGL at ignition...otherwise 4500 ft AGL.
Mixing winds........Southwest around 5 mph shifting to the west 5
                    to 12 mph through early afternoon, then
                    shifting to the northwest 15 to 17 mph through
                    mid afternoon shifting to the north 16 to 17
                    mph late in the day.
Smoke dispersal.....20 /poor/ at ignition. Max...760 /excellent/.
Haines Index........4 or low potential for large plume dominated
                    fire growth at ignition...max 5.

TIME (EDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Sky (%).........3      2      3      2      10     26
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............41     55     61     62     63     61
RH..............82     55     42     38     35     35
20 ft wind......SW 2   NW 6   W 9    NW 10  NW 12  N 10
20 ft wind gust.3      7      14     17     17     16
Mix hgt (ft)....400    1400   3900   4400   4000   3900
Mixing wind.....S 5    W 5    W 12   W 17   NW 17  N 17
Haines index....4      4      4      5      5      5
Smoke disprsl...20     60     450    760    690    680

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
Temperature.........Min 39.
RH..................Max 70 percent.
Wind (20 ft)........North winds 7 to 8 mph shifting to the east 6
                    to 7 mph.
Mixing height.......400 ft AGL.
Mixing winds........North 8 to 12 mph shifting to the east 9 to 12
                    mph after midnight.
Smoke dispersal.....30 (poor).
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

.TUESDAY...

Sky/weather.........Mostly sunny (45-55 percent) then becoming
                    mostly cloudy (75-85 percent). Slight chance of
                    rain showers in the afternoon.
Temperature.........Max 65.
RH..................Min 29 percent.
Wind (20 ft)........East winds 9 to 18 mph increasing to around 21
                    mph in the evening.
Mixing height.......3000 ft AGL.
Mixing winds........East 12 to 21 mph increasing to 23 to 30 mph
                    late in the day.
Smoke dispersal.....60 (poor) early in the morning increasing to
                    720 (excellent) in the afternoon.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

$$
Forecaster...Felver
Requested by...Joe Raspotnik
Type of request...PRESCRIBED
.TAG 2410760.0/GRR
.DELDT 04/15/24
.FormatterVersion 2.0.0
.EMAIL joseph.raspotnik@usda.gov