839
FNUS73 KGRR 030921
FWSGRR
SPOT FORECAST FOR RAIL...USFS
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
521 AM EDT SUN MAY 3 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON MAY 03.
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
SOUTHWEST WINDS WILL PICK UP QUICKLY THIS MORNING WITH GUSTS 20 TO
30 MPH INCREASING THIS AFTERNOON TO 30 TO 40 MPH. RELATIVE
HUMIDITY VALUES WILL BE IN THE 50S THIS AFTERNOON WITH A 20
PERCENT CHANCE OF VALUES DROPPING INTO THE 40S. MIXING HEIGHTS
WILL PEAK AROUND 2000 FEET THIS AFTERNOON BEFORE DECREASING BELOW
1000 FEET 6 TO 8 PM. THERE IS A 20 TO 30 PERCENT CHANCE FOR
SHOWERS, BUT DRY AIR MAY KEEP SHOWERS FROM REACHING THE GROUND.
MONDAY WILL BE SIMILAR WITH WIND SPEEDS BUT WITH LOWER RELATIVE
HUMIDITY VALUES. MINIMUM RELATIVE HUMIDITY VALUES ARE EXPECTED TO
DROP DOWN TO 40, BUT THERE IS A 20 TO 30 PERCENT CHANCE FOR THESE
VALUES TO DROP INTO THE 30S IF WE OBSERVE HIGHER MIXING HEIGHTS.
ANY RAIN CHANCES MONDAY SHOULD HOLD OFF UNTIL MONDAY NIGHT.
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF RAIN
SHOWERS IN THE LATE MORNING AND EARLY
AFTERNOON. SLIGHT CHANCE OF RAIN SHOWERS LATE
IN THE AFTERNOON.
TEMPERATURE.........46 AT IGNITION...MAX 61.
RH..................65 PERCENT AT IGNITION...MIN 51 PERCENT.
WIND (20 FT)........WINDS SOUTHWEST AT 10 MPH AT
IGNITION...OTHERWISE SOUTHWEST WINDS 10 TO 16
MPH. GUSTS UP TO 29 MPH INCREASING TO 30 MPH
LATE IN THE AFTERNOON.
MIXING HEIGHT.......600 FT AGL AT IGNITION...OTHERWISE 2000 FT AGL.
MIXING WINDS........SOUTHWEST 15 TO 23 MPH INCREASING TO 28 TO 29
MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....80 /POOR/ AT IGNITION. MAX...570 /GOOD/.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM
SKY (%).........94 93 87 85 85 75 69 70 70 60 46 40
WEATHER COV.....CHC CHC CHC CHC CHC SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............46 49 52 54 56 58 58 58 57 56 56 54
RH..............65 58 54 52 53 51 53 53 55 57 57 61
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..10 12 12 13 14 15 16 15 15 14 13 10
20 FT WIND GUST.20 22 24 26 28 29 30 30 30 29 25 23
MIX HGT (KFT)...0.6 1.0 1.2 1.7 1.6 2.0 2.0 2.0 1.5 1.3 0.8 0.6
MIXING WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
MIXING WIND SPD.15 20 18 21 23 28 28 29 28 24 20 17
SMOKE DISPRSL...80 190 210 350 370 560 560 570 410 300 160 100
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING
PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (25-35 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS EARLY IN THE EVENING.
TEMPERATURE.........MIN 39.
RH..................MAX 96 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 6 TO 14 MPH WITH GUSTS TO
AROUND 29 MPH IN THE EVENING BECOMING LIGHT,
THEN BECOMING SOUTH AROUND 5 MPH EARLY IN THE
MORNING.
MIXING HEIGHT.......400 FT AGL.
MIXING WINDS........SOUTHWEST 17 TO 24 MPH BECOMING SOUTH 3 TO 8
MPH.
SMOKE DISPERSAL.....300 (GOOD) EARLY IN THE EVENING DECREASING TO
10 (POOR) LATE IN THE NIGHT.
MONDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). CHANCE OF RAIN
SHOWERS LATE IN THE AFTERNOON. SLIGHT CHANCE OF
THUNDERSTORMS LATE IN THE AFTERNOON.
TEMPERATURE.........MAX 67.
RH..................MIN 41 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 6 TO 14 MPH. GUSTS UP TO 28 MPH
IN THE LATE MORNING AND AFTERNOON. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS LATE
IN THE AFTERNOON.
MIXING HEIGHT.......2500 FT AGL.
MIXING WINDS........SOUTH 10 TO 17 MPH INCREASING TO SOUTHWEST 22
TO 29 MPH LATE IN THE MORNING.
SMOKE DISPERSAL.....40 (POOR) EARLY IN THE MORNING INCREASING TO
690 (EXCELLENT) IN THE AFTERNOON.
FORECASTER...HANSEN
REQUESTED BY...USFS
TYPE OF REQUEST...PRESCRIBED
.TAG 2612516.0/GRR
.DELDT 05/03/26
.FORMATTERVERSION 2.0.0
.EMAIL JOSEPH.RASPOTNIK@USDA.GOV,BRANDON.KELLEY@USDA.GOV
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