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Spot Forecast
Issued by NWS Grand Rapids, MI

000
FNUS73 KGRR 130633
FWSGRR

Spot Forecast for Bigelow Block 3...USFS
National Weather Service Grand Rapids MI
233 AM EDT Sat Apr 13 2024

Forecast is based on ignition time of 0900 EDT on April 13.
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 less wind than yesterday are expected
today. A high pressure ridge will settle over the state resulting
in drier conditions too with minimum RH values near 30 percent this
afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent).
Temperature.........41 at ignition...Max 57.
RH..................70 percent at ignition...Min 32 percent.
Wind (20 ft)........Winds northwest at 14 mph at
                    ignition...otherwise Northwest winds 13 to 15
                    mph shifting to the southwest 10 to 12 mph late
                    in the day.
Mixing height.......1900 ft AGL at ignition...otherwise 3600 ft
                    AGL.
Mixing winds........Northwest 16 to 24 mph shifting to the west
                    around 14 mph in the evening.
Smoke dispersal.....400 /good/ at ignition. Max...770 /excellent/.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth at ignition...max 5.

TIME (EDT)      9 AM   11 AM  1 PM   3 PM   5 PM   7 PM
Sky (%).........1      2      2      2      5      17
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............41     48     53     56     57     56
RH..............70     51     39     32     33     37
20 ft wind......NW 14  NW 15  NW 14  W 15   W 13   SW 10
20 ft wind gust.22     22     22     23     20     16
Mix hgt (ft)....1900   2900   3500   3600   3400   2200
Mixing wind.....NW 21  NW 24  NW 22  W 20   W 17   W 14
Haines index....5      5      5      5      5      5
Smoke disprsl...400    710    770    700    590    300

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent) then becoming
                    mostly cloudy (50-60 percent) then becoming
                    partly cloudy (20-30 percent). Slight chance of
                    rain showers in the evening, then chance of
                    showers and thunderstorms overnight.
Temperature.........Min 47.
RH..................Max 83 percent.
Wind (20 ft)........South winds 7 to 16 mph shifting to the
                    southwest 13 to 17 mph toward daybreak. Gusty
                    and erratic winds expected near thunderstorms
                    overnight. Gusty and erratic winds expected
                    near thunderstorms toward daybreak.
Mixing height.......500 ft AGL.
Mixing winds........Southwest 9 to 17 mph.
Smoke dispersal.....140 (fair) early in the evening decreasing to
                    50 (poor) late in the night.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

.SUNDAY...

Sky/weather.........Mostly sunny (25-35 percent).
Temperature.........Max 71.
RH..................Min 37 percent.
Wind (20 ft)........West winds 10 to 12 mph shifting to the north
                    around 13 mph in the evening.
Mixing height.......5000 ft AGL.
Mixing winds........West 14 to 16 mph shifting to the northwest 14
                    to 18 mph in the afternoon.
Smoke dispersal.....80 (poor) early in the morning increasing to
                    920 (excellent) in the afternoon.
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

$$
Forecaster...Felver
Requested by...Jeff Nieland
Type of request...PRESCRIBED
.TAG 2410519.0/GRR
.DELDT 04/13/24
.FormatterVersion 2.0.0
.EMAIL Joseph.Raspotnik@usda.gov