Spot Forecast
Issued by NWS Grand Rapids, MI

000
FNUS73 KGRR 201718
FWSGRR

Spot Forecast for Prairie Field 3...MI DNR
National Weather Service Grand Rapids MI
118 PM EDT Sat Apr 20 2024

Forecast is based on ignition time of 1400 EDT on April 20.
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...
Westerly winds will continue to gust up to 25 mph this afternoon
before relaxing somewhat tonight. Highs only in the mid 40s this
afternoon under partly sunny skies, but RHs still dipping into the
upper 30s despite the chillly air.


.REST OF TODAY...

Sky/weather.........Partly sunny (45-55 percent).
Temperature.........42 at ignition...Max 46.
RH..................44 percent at ignition...Min 39 percent.
Wind (20 ft)........Winds west at 15 mph at ignition...otherwise
                    West winds 13 to 16 mph.
Mixing height.......6200 ft AGL at ignition...otherwise 6200 ft
                    AGL.
Mixing winds........West 20 to 24 mph.
Smoke dispersal.....1490 /excellent/ at ignition. Max...1490
                    /excellent/.
Haines Index........4 or low potential for large plume dominated
                    fire growth at ignition...max 4.

TIME (EDT)      2 PM   4 PM   6 PM   8 PM   10 PM  MIDNGT
Sky (%).........52     50     41     24     35     45
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............42     44     44     42     38     35
RH..............44     41     39     43     52     64
20 ft wind......W 15   W 16   W 15   W 12   W 7    W 6
20 ft wind gust.22     23     23     18     13     13
Mix hgt (ft)....6200   5400   5300   3400   1200   400
Mixing wind.....W 24   W 23   W 21   W 18   W 12   W 8
Haines index....4      4      4      3      3      3
Smoke disprsl...1490   1250   1090   630    140    30

.TONIGHT...

Sky/weather.........Partly cloudy. Frost possible after midnight.
Temperature.........Min 32.
RH..................Max 75 percent.
Wind (20 ft)........West winds 6 to 12 mph.
Mixing height.......400 ft AGL.
Mixing winds........West 10 to 18 mph decreasing to 8 to 10 mph
                    after midnight.
Smoke dispersal.....630 (excellent) early in the evening decreasing
                    to 30 (poor) late in the night.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

.SUNDAY...

Sky/weather.........Sunny (5-15 percent). Frost possible early in
                    the morning.
Temperature.........Max 54.
RH..................Min 28 percent.
Wind (20 ft)........West winds 7 to 16 mph.
Mixing height.......5400 ft AGL.
Mixing winds........West 10 to 18 mph increasing to 16 to 25 mph.
Smoke dispersal.....320 (good) early in the morning increasing to
                    1330 (excellent) in the afternoon.
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

$$
Forecaster...Meade
Requested by...Nate Stearns
Type of request...PRESCRIBED
.TAG 2411511.0/GRR
.DELDT 04/20/24
.FormatterVersion 2.0.0
.EMAIL stearnsn@michigan.gov