537
FNUS73 KGRR 301801
FWSGRR

Spot Forecast for Tank Rx...MIDNR
National Weather Service Grand Rapids MI
201 PM EDT Tue Apr 30 2024

Forecast is based on ignition time of 1500 EDT on April 30.
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...A  westerly flow will prevail today leading to
sunny skies.  The gusty winds will continue through much of the
afternoon.  Humidity levels will drop steadily, lowering
in the 50 to 55 percent range in the middle part of the
afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
Temperature.........62 at ignition...Max 66.
RH..................55 percent at ignition...Min 53 percent.
Wind (20 ft)........Winds west at 14 mph at ignition...otherwise
                    West winds 5 to 14 mph.
Mixing height.......3100 ft AGL at ignition...otherwise 3100 ft
                    AGL.
Mixing winds........West 15 to 21 mph decreasing to around 9 mph in
                    the evening.
Smoke dispersal.....650 /excellent/ at ignition. Max...650
                    /excellent/.
Haines Index........4 or low potential for large plume dominated
                    fire growth at ignition...max 4.

TIME (EDT)      3 PM   5 PM   7 PM   9 PM   11 PM  1 AM
Sky (%).........4      5      6      4      5      28
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............62     62     63     59     55     54
RH..............55     54     53     64     74     74
20 ft wind......W 14   W 9    W 5    SE 3   SE 7   SE 8
20 ft wind gust.23     21     12            8      13
Mix hgt (ft)....3100   2800   1900   400    400    400
Mixing wind.....W 21   W 17   W 9    S 5    SE 7   S 12
Haines index....4      4      4      4      4      4
Smoke disprsl...650    490    180    20     20     50

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent) then becoming
                    mostly cloudy (60-70 percent).
Temperature.........Min 54.
RH..................Max 74 percent.
Wind (20 ft)........Light winds becoming southeast 6 to 9 mph, then
                    shifting to the south 10 to 13 mph with gusts
                    to around 25 mph toward daybreak.
Mixing height.......300 ft AGL.
Mixing winds........Southwest around 5 mph shifting to the
                    southeast 5 to 14 mph, then shifting to the
                    southwest 15 to 18 mph toward daybreak.
Smoke dispersal.....150 (fair) early in the evening decreasing to
                    20 (poor) late in the night.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

.WEDNESDAY...

Sky/weather.........Mostly sunny (30-40 percent).
Temperature.........Max 68.
RH..................Min 39 percent.
Wind (20 ft)........Southwest winds 14 to 18 mph shifting to the
                    west 10 to 17 mph with gusts to around 28 mph
                    in the afternoon.
Mixing height.......3800 ft AGL.
Mixing winds........West 20 to 24 mph shifting to the northwest 18
                    to 24 mph in the afternoon, then shifting to
                    the west around 13 mph in the evening.
Smoke dispersal.....180 (fair) early in the morning increasing to
                    930 (excellent) in the afternoon.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

$$
Forecaster...Sekelsky
Requested by...Jeff Vasher
Type of request...PRESCRIBED
.TAG 2412815.0/GRR
.DELDT 04/30/24
.FormatterVersion 2.0.0
.EMAIL vasherj@michigan.gov