Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Grand Rapids, MI
Issued by NWS Grand Rapids, MI
190
FNUS53 KGRR 181743
FWFGRR
Fire Weather Planning Forecast for Southwest Lower Michigan
National Weather Service Grand Rapids MI
143 PM EDT Tue Aug 18 2026
...Showers and Storms Tonight...
.DISCUSSION...
Showers and thunderstorms are expetcted to develop this evening
with pockets of over 1/2" of rain possible in the heaviest
thunderstorms. Gusty winds are also possible. High pressure
then dries things out for Wednesday and Thursday with MinRH
values falling into the upper 30s for sime, lowest across
interior Central Lower Michigan.
MIZ037>039-043>045-190815-
Mason-Lake-Osceola-Oceana-Newaygo-Mecosta-
Including the cities of Ludington, Baldwin, Reed City, Hart,
Fremont, and Big Rapids
143 PM EDT Tue Aug 18 2026
.TONIGHT...
Sky/weather.........Mostly cloudy (70-80 percent) until 3 AM, then
partly cloudy (60-70 percent). Rain showers
until 12 AM. Chance of thunderstorms. Chance of
rain showers after 12 AM.
Chance of pcpn......80 percent.
Min temperature.....53-58.
24 hr trend......Unchanged.
Max humidity........95-100 percent.
24 hr trend......Unchanged.
20-foot winds.......Southwest winds around 8 mph in the evening
becoming light.
Mixing height.......Near Lake Michigan, 1500-2000 ft AGL.
Mixing height.......Inland, 3400-3900 ft AGL decreasing to 800-1300
ft AGL after midnight.
Transport winds.....Southwest around 10 mph shifting to the
northwest after midnight.
Smoke dispersal.....840 (excellent) decreasing to 110 (poor) after
midnight.
Pcpn Amount.........0.07-0.79 in.
.WEDNESDAY...
Sky/weather.........Mostly sunny (30-40 percent).
Max temperature.....75-80.
24 hr trend......3 degrees cooler.
Min humidity........33-38 percent.
24 hr trend......13 percent drier.
20-foot winds.......Light winds becoming northwest around 7 mph in
the afternoon.
Mixing height.......Near Lake Michigan, 4400-4900 ft AGL.
Mixing height.......Inland, 2800-3300 ft AGL increasing to
6500-7000 ft AGL in the afternoon.
Transport winds.....North 5 to 10 mph.
Smoke dispersal.....240 (fair) increasing to 850 (excellent) in the
afternoon.
Pcpn Amount.........none to 0.03 in.
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (10-20 percent).
Min temperature.....46-51.
24 hr trend......7 degrees cooler.
Max humidity........93-98 percent.
24 hr trend......Unchanged.
20-foot winds.......Light winds.
Mixing height.......Near Lake Michigan, 3300-3800 ft AGL decreasing
to 0-500 ft AGL after midnight.
Mixing height.......Inland, 5000-5500 ft AGL decreasing to 0-400 ft
AGL after midnight.
Transport winds.....North around 10 mph shifting to the east after
midnight.
Smoke dispersal.....660 (excellent) decreasing to 30 (poor) after
midnight.
Pcpn Amount.........None.
.THURSDAY...
Sky/weather.........Sunny (5-15 percent).
Max temperature.....77-82.
24 hr trend......2 degrees warmer.
Min humidity........45-50 percent near Lake Michigan and 33-38
percent Inland.
24 hr trend......6 percent wetter near Lake Michigan and
unchanged Inland.
20-foot winds.......Light winds becoming west around 7 mph in the
afternoon.
Mixing height.......Near Lake Michigan, 4500-5000 ft AGL.
Mixing height.......Inland, 4000-4500 ft AGL increasing to
7900-8400 ft AGL in the afternoon.
Transport winds.....South around 5 mph shifting to the west in the
afternoon.
Smoke dispersal.....470-960 (good to excellent).
Pcpn Amount.........None.
$$
MIZ040-046-190815-
Clare-Isabella-
Including the cities of Clare and Mount Pleasant
143 PM EDT Tue Aug 18 2026
.TONIGHT...
Sky/weather.........Mostly cloudy (75-85 percent) until 12 AM, then
partly cloudy (55-65 percent). Rain showers and
a chance of thunderstorms.
Chance of pcpn......80 percent.
Min temperature.....51-56.
24 hr trend......4 degrees warmer.
Max humidity........100 percent.
24 hr trend......Unchanged.
20-foot winds.......West winds around 9 mph in the evening becoming
light.
Mixing height.......4900-5400 ft AGL decreasing to 800-1300 ft AGL
after midnight.
Transport winds.....West around 15 mph becoming northwest around 5
mph after midnight.
Smoke dispersal.....970 (excellent) decreasing to 100 (poor) after
midnight.
Pcpn Amount.........0.08-0.43 in.
.WEDNESDAY...
Sky/weather.........Mostly sunny (30-40 percent).
Max temperature.....Around 79.
24 hr trend......4 degrees cooler.
Min humidity........33-38 percent.
24 hr trend......7 percent drier.
20-foot winds.......Light winds becoming northwest around 6 mph in
the afternoon.
Mixing height.......2800-3300 ft AGL increasing to 7500-8000 ft AGL
in the afternoon.
Transport winds.....North around 5 mph shifting to the northwest in
the afternoon.
Smoke dispersal.....240 (fair) increasing to 900 (excellent) in the
afternoon.
Pcpn Amount.........none to 0.07 in.
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (10-20 percent).
Min temperature.....43-48.
24 hr trend......8 degrees cooler.
Max humidity........94-99 percent.
24 hr trend......Unchanged.
20-foot winds.......North winds up to 5 mph.
Mixing height.......6500-7000 ft AGL decreasing to 0-400 ft AGL
after midnight.
Transport winds.....North around 10 mph shifting to the northeast
after midnight.
Smoke dispersal.....720 (excellent) decreasing to 30 (poor) after
midnight.
Pcpn Amount.........None.
.THURSDAY...
Sky/weather.........Sunny (10-20 percent).
Max temperature.....Around 81.
24 hr trend......2 degrees warmer.
Min humidity........31-36 percent.
24 hr trend......2 percent drier.
20-foot winds.......Light winds becoming west around 6 mph in the
afternoon.
Mixing height.......4100-4600 ft AGL increasing to 8700-9200 ft AGL
in the afternoon.
Transport winds.....South around 5 mph shifting to the west in the
afternoon.
Smoke dispersal.....390 (good) increasing to 1030 (excellent) in
the afternoon.
Pcpn Amount.........None.
$$
MIZ050-056-064-071-190815-
Muskegon-Ottawa-Allegan-Van Buren-
Including the cities of Muskegon, Grand Haven, Jenison, Holland,
and South Haven
143 PM EDT Tue Aug 18 2026
.TONIGHT...
Sky/weather.........Partly cloudy (60-70 percent) until 9 PM, then
mostly cloudy (75-85 percent) until 12 AM, then
partly cloudy (60-70 percent). Showers until 12
AM. Chance of thunderstorms. Chance of showers
after 12 AM.
Chance of pcpn......90 percent.
Min temperature.....59-64.
24 hr trend......3 degrees warmer.
Max humidity........95-100 percent.
24 hr trend......Unchanged.
20-foot winds.......Southwest winds around 9 mph in the evening
becoming light.
Mixing height.......Near Lake Michigan, 1600-2100 ft AGL.
Mixing height.......Inland, 3200-3700 ft AGL decreasing to 800-1300
ft AGL after midnight.
Transport winds.....West around 10 mph.
Smoke dispersal.....130-470 (fair to good).
Pcpn Amount.........0.11-0.68 in.
.WEDNESDAY...
Sky/weather.........Mostly sunny (45-55 percent).
Max temperature.....75-80.
24 hr trend......2 degrees cooler.
Min humidity........42-47 percent.
24 hr trend......3 percent drier.
20-foot winds.......Light winds becoming northwest around 6 mph in
the afternoon.
Mixing height.......Near Lake Michigan, 2300-2800 ft AGL increasing
to 4500-5000 ft AGL in the afternoon.
Mixing height.......Inland, 2100-2600 ft AGL increasing to
6200-6700 ft AGL in the afternoon.
Transport winds.....Northwest 5 to 10 mph.
Smoke dispersal.....190-640 (fair to excellent).
Pcpn Amount.........none to 0.01 in.
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (20-30 percent).
Min temperature.....51-56.
24 hr trend......10 degrees cooler.
Max humidity........92-97 percent.
24 hr trend......Unchanged.
20-foot winds.......North winds around 5 mph in the evening
becoming light.
Mixing height.......Near Lake Michigan, 3000-3500 ft AGL decreasing
to 0-500 ft AGL after midnight.
Mixing height.......Inland, 4900-5400 ft AGL decreasing to 0-400 ft
AGL after midnight.
Transport winds.....North around 10 mph shifting to the northeast
after midnight.
Smoke dispersal.....40-560 (poor to good).
Pcpn Amount.........None.
.THURSDAY...
Sky/weather.........Sunny (5-15 percent).
Max temperature.....76-81.
24 hr trend......1 degree warmer.
Min humidity........41-46 percent.
24 hr trend......8 percent drier.
20-foot winds.......Light winds becoming west around 5 mph in the
afternoon.
Mixing height.......Near Lake Michigan, 2600-3100 ft AGL increasing
to 4900-5400 ft AGL in the afternoon.
Mixing height.......Inland, 3900-4400 ft AGL increasing to
7200-7700 ft AGL in the afternoon.
Transport winds.....East around 5 mph shifting to the northwest in
the afternoon.
Smoke dispersal.....260-680 (fair to excellent).
Pcpn Amount.........None.
$$
MIZ051-052-057>059-190815-
Montcalm-Gratiot-Kent-Ionia-Clinton-
Including the cities of Greenville, Alma, Grand Rapids, Ionia,
and St. Johns
143 PM EDT Tue Aug 18 2026
.TONIGHT...
Sky/weather.........Mostly cloudy (70-80 percent). Showers until 12
AM. Chance of thunderstorms. Chance of showers
after 12 AM.
Chance of pcpn......80 percent.
Min temperature.....59-64.
24 hr trend......5 degrees warmer.
Max humidity........100 percent.
24 hr trend......Unchanged.
20-foot winds.......West winds 6 to 11 mph. Gusts up to 22 mph in
the evening.
Mixing height.......4600-5100 ft AGL decreasing to 800-1300 ft AGL
after midnight.
Transport winds.....West 10 to 15 mph.
Smoke dispersal.....790 (excellent) decreasing to 130 (fair) after
midnight.
Pcpn Amount.........0.05-0.50 in.
.WEDNESDAY...
Sky/weather.........Mostly sunny (40-50 percent).
Max temperature.....Around 80.
24 hr trend......4 degrees cooler.
Min humidity........36-41 percent.
24 hr trend......3 percent drier.
20-foot winds.......Light winds becoming northwest around 6 mph in
the afternoon.
Mixing height.......2500-3000 ft AGL increasing to 7000-7500 ft AGL
in the afternoon.
Transport winds.....Northwest 5 to 10 mph.
Smoke dispersal.....230-680 (fair to excellent).
Pcpn Amount.........none to 0.06 in.
.WEDNESDAY NIGHT...
Sky/weather.........Partly cloudy (20-30 percent).
Min temperature.....50-55.
24 hr trend......9 degrees cooler.
Max humidity........90-95 percent.
24 hr trend......Unchanged.
20-foot winds.......Northwest winds around 5 mph in the evening
becoming light.
Mixing height.......6200-6700 ft AGL decreasing to 0-400 ft AGL
after midnight.
Transport winds.....North around 10 mph shifting to the northeast
after midnight.
Smoke dispersal.....40-590 (poor to good).
Pcpn Amount.........None.
.THURSDAY...
Sky/weather.........Sunny (5-15 percent).
Max temperature.....Around 81.
24 hr trend......1 degree warmer.
Min humidity........31-36 percent.
24 hr trend......5 percent drier.
20-foot winds.......Light winds becoming southwest around 5 mph in
the afternoon.
Mixing height.......3700-4200 ft AGL increasing to 8600-9100 ft AGL
in the afternoon.
Transport winds.....East around 5 mph shifting to the northwest in
the afternoon.
Smoke dispersal.....250 (fair) increasing to 860 (excellent) in the
afternoon.
Pcpn Amount.........None.
$$
MIZ065>067-072>074-190815-
Barry-Eaton-Ingham-Kalamazoo-Calhoun-Jackson-
Including the cities of Hastings, Charlotte, Lansing, Kalamazoo,
Battle Creek, and Jackson
143 PM EDT Tue Aug 18 2026
.TONIGHT...
Sky/weather.........Partly cloudy (60-70 percent) until 12 AM, then
mostly cloudy (70-80 percent). Showers and a
chance of thunderstorms.
Chance of pcpn......90 percent.
Min temperature.....Around 63.
24 hr trend......7 degrees warmer.
Max humidity........100 percent.
24 hr trend......Unchanged.
20-foot winds.......Southwest winds 5 to 10 mph.
Mixing height.......4900-5400 ft AGL decreasing to 800-1300 ft AGL
after midnight.
Transport winds.....West around 10 mph.
Smoke dispersal.....760 (excellent) decreasing to 100 (poor) after
midnight.
Pcpn Amount.........0.05-0.53 in.
.WEDNESDAY...
Sky/weather.........Partly sunny (55-65 percent).
Max temperature.....Around 79.
24 hr trend......3 degrees cooler.
Min humidity........43-48 percent.
24 hr trend......3 percent wetter.
20-foot winds.......Light winds becoming northwest around 6 mph in
the afternoon.
Mixing height.......2100-2600 ft AGL increasing to 5400-5900 ft AGL
in the afternoon.
Transport winds.....Northwest 5 to 10 mph.
Smoke dispersal.....200-570 (fair to good).
Pcpn Amount.........None to 0.11 in.
.WEDNESDAY NIGHT...
Sky/weather.........Partly cloudy (30-40 percent).
Min temperature.....Around 53.
24 hr trend......9 degrees cooler.
Max humidity........95-100 percent.
24 hr trend......Unchanged.
20-foot winds.......North winds 5 to 6 mph.
Mixing height.......4400-4900 ft AGL decreasing to 0-400 ft AGL
after midnight.
Transport winds.....North around 10 mph shifting to the northeast
after midnight.
Smoke dispersal.....40-420 (poor to good).
Pcpn Amount.........None.
.THURSDAY...
Sky/weather.........Sunny (15-25 percent).
Max temperature.....Around 80.
24 hr trend......1 degree warmer.
Min humidity........32-37 percent.
24 hr trend......13 percent drier.
20-foot winds.......Northeast winds up to 5 mph.
Mixing height.......3700-4200 ft AGL increasing to 7400-7900 ft AGL
in the afternoon.
Transport winds.....Northeast around 5 mph.
Smoke dispersal.....270-540 (fair to good).
Pcpn Amount.........None.
$$
.FORECAST FOR DAYS 3 THROUGH 7...
.THURSDAY NIGHT...Mostly clear. Lows in the mid 50s. West winds 5 to
6 mph in the evening becoming light.
.FRIDAY...Mostly sunny with a chance of showers. Highs around 80.
Southwest winds 5 to 10 mph.
.FRIDAY NIGHT...Partly cloudy with a chance of showers. Lows around
60. Southwest winds 5 to 9 mph.
.SATURDAY...Mostly sunny with a chance of showers. Chance of
thunderstorms in the afternoon. Highs in the upper 70s. West winds
6 to 11 mph.
.SATURDAY NIGHT...Mostly clear. Chance of showers and thunderstorms
in the evening. Lows in the mid 50s. Northwest winds 6 to 11 mph.
.SUNDAY...Sunny. Highs in the mid 70s. Northwest winds 6 to 11 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 50s.
.MONDAY...Mostly sunny. Highs in the upper 70s.
.MONDAY NIGHT...Partly cloudy. Lows in the mid 50s.
.TUESDAY...Mostly sunny. Highs around 80.
$$