Text Products for FWS Issued by GRR

Spot Forecast
Issued by NWS Grand Rapids, MI
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000
FNUS73 KGRR 181814
FWSGRR

Spot Forecast for Wolf/Hammer RX...USFS
National Weather Service Grand Rapids MI
214 PM EDT Thu Apr 18 2024

Forecast is based on ignition time of 1500 EDT on April 18.
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 window of opportunity the middle of this afternoon for only a
minor chance of light rain showers before rain becomes more likely
after 6 PM. Skies will be mostly cloudy but a few peeks of sunshine
will be possible. Wind direction may vary between southwest and
west.

.REST OF TODAY...

Sky/weather.........Mostly cloudy (75-85 percent). Slight chance of
                    rain showers at ignition time. Rain showers
                    becoming likely in the evening.
Temperature.........52 at ignition...Max 54.
RH..................61 percent at ignition...Min 61 percent.
Wind (20 ft)........Winds west-southwest at 6 to 8 mph.
Mixing height.......1900 ft AGL at ignition...otherwise 2000 ft
                    AGL.
Mixing winds........West 6 to 8 mph.
Smoke dispersal.....130 /fair/ at ignition. Max...160 /fair/.
Haines Index........3 or very low potential for large plume
                    dominated fire growth at ignition...max 3.

TIME (EDT)      3 PM   5 PM   7 PM   9 PM   11 PM  1 AM
Sky (%).........91     71     92     96     96     92
Weather cov.....S CHC  S CHC  LIKELY DEFNTE CHANCE S CHC
Weather type....RNSHWR RNSHWR RNSHWR RAIN   RAIN   RAIN
Tstm cov........
Temp............52     51     49     46     44     44
RH..............61     63     71     86     93     89
20 ft wind......W 8    W 7    SW 6   SW 5   SW 5   W 6
20 ft wind gust.13     12     10     7      7      9
Mix hgt (ft)....1900   1800   1100   1000   600    600
Mixing wind.....W 7    W 7    W 6    W 8    SW 7   W 8
Haines index....3      3      3      3      3      3
Smoke disprsl...130    130    60     80     40     50

.TONIGHT...

Sky/weather.........Mostly cloudy (80-90 percent) then becoming
                    partly cloudy (30-40 percent). Rain in the
                    evening.
Temperature.........Min 36.
RH..................Max 93 percent.
Wind (20 ft)........Southwest winds 5 to 6 mph shifting to the west
                    6 to 12 mph overnight.
Mixing height.......600 ft AGL.
Mixing winds........West 6 to 15 mph.
Smoke dispersal.....130 (fair) early in the evening decreasing to
                    30 (poor) late in the night.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

.FRIDAY...

Sky/weather.........Mostly sunny (25-35 percent).
Temperature.........Max 50.
RH..................Min 40 percent.
Wind (20 ft)........West winds 10 to 17 mph.
Mixing height.......7900 ft AGL.
Mixing winds........West 14 to 22 mph increasing to 24 to 33 mph
                    through early afternoon, then increasing to 30
                    to 37 mph in the afternoon decreasing to around
                    23 mph in the evening.
Smoke dispersal.....110 (poor) early in the morning increasing to
                    1100 (excellent) in the afternoon increasing to
                    1600 (excellent) through mid afternoon, then
                    increasing to 2740 (excellent) late in the day
                    decreasing to 840 (excellent) late in the day.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

$$
Forecaster...Scholten
Requested by...Nielandf
Type of request...PRESCRIBED
.TAG 2411338.0/GRR
.DELDT 04/18/24
.FormatterVersion 2.0.0
.EMAIL Jeff.nieland@usda.gov
National Weather Service Weather Forecast Office
