Spot Forecast
Issued by NWS Marquette, MI
Issued by NWS Marquette, MI
870
FNUS73 KMQT 171121
FWSMQT
Spot Forecast for Red Rocks...National Park Service
National Weather Service Marquette MI
721 AM EDT Fri Jul 17 2026
Forecast is based on forecast start time of 0800 EDT on July 17.
If conditions become unrepresentative...contact the National Weather
Service.
.DISCUSSION...
A complex of showers and thunderstorms will move across Isle Royale
this morning bringing widespread wetting rains. Smoke from Canadian
wildfires will continue to reduce visibility and a near surface stable
layer will result in poor ventilation. Additional showers and
thunderstorms are possible this afternoon and evening as a shortwave
and cold front push through the area. Humidity will remain high today,
generally 80 percent or higher. Winds will shift to the northwest
late tonight as a cold front pushes through the area.
.REST OF TODAY...
Sky/weather.........Mostly cloudy (75-85 percent). Areas of smoke.
Showers and thunderstorms likely this morning.
Chance of thunderstorms through the day. Rain
showers likely in the afternoon.
Chance of pcpn......80 percent.
Chance of thunder...60 percent.
Temperature.........53 at forecast start...Max 57.
RH..................89 percent at forecast start...Min 78 percent.
Dewpoint............50.
33-foot winds.......Winds southeast at 8 mph at forecast
start...otherwise Southeast winds 8 to 10 mph.
Gusty and erratic winds expected near
thunderstorms.
20-foot winds.......Southeast winds 6 to 8 mph.
Mixing height.......400 ft AGL at forecast start...otherwise 400 ft
AGL.
Ventilation index...Poor (40) at forecast start. Max...poor (48.0).
Rainfall amount.....0.57 inches.
Ceiling (kft).......3.8 increasing to 5.3 late in the morning, then
decreasing to 4.8 early in the afternoon
decreasing to 3.6 early in the afternoon
decreasing to 2.3 decreasing to 1.6 late in the
afternoon.
TIME (EDT) 8 AM 10 AM NOON 2 PM 4 PM
Sky (%).........87 79 77 77 80
Weather cov.....CHANCE DEFNTE DEFNTE DEFNTE CHANCE
Weather type....RNSHWR RNSHWR SMOKE SMOKE RNSHWR
Tstm cov........S CHC S CHC CHANCE CHANCE CHANCE
Chc of pcpn (%).50 80 70 70 50
Chc of thdr (%).60 60 30 40 40
Temp............53 56 55 54 55
Dewpoint........49 51 51 52 52
RH..............89 83 89 91 88
33 ft wind......SE 8 SE 9 SE 9 SE 9 SE 10
20 ft wind......SE 6 SE 7 SE 7 SE 7 SE 8
Wind gust.......10 10 10 10 10
Mix hgt (ft)....400 400 400 400 400
VIndx kt-ft/100.4 4 4 4 4
Ceiling (kft)...3.8 5.3 4.8 2.3 2.0
.TONIGHT...
Sky/weather.........Mostly cloudy (80-90 percent). Areas of smoke.
Rain showers likely and chance of thunderstorms
in the evening. Chance of rain showers overnight.
Chance of pcpn......70 percent.
Chance of thunder...37 percent.
Temperature.........Min 51.
RH..................Max 100 percent.
Dewpoint............50.
33-foot winds.......Southeast winds 7 to 9 mph shifting to the
north 6 to 7 mph late in the evening, then
shifting to the northwest 7 to 14 mph
overnight. Gusty and erratic winds expected
near thunderstorms in the evening.
20-foot winds.......Southeast winds 6 to 7 mph shifting to the
north 5 to 6 mph late in the evening, then
shifting to the northwest 6 to 11 mph
overnight.
Mixing height.......400 ft AGL.
Ventilation index...Poor (30.0).
Rainfall amount.....0.23 inches.
Ceiling (kft).......1.3 decreasing to 0.9 early in the evening,
then decreasing to 0.7 late in the evening
decreasing to 0.6 late in the evening
increasing to 0.7 increasing to 0.9 overnight
increasing to 1.1 increasing to 2.3 after 3 am
increasing to 3.5 increasing to 4.7 early in
the morning.
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
Sky (%).........85 82 91 80 78 96
Weather cov.....LIKELY CHANCE CHANCE CHANCE S CHC AREAS
Weather type....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR SMOKE
Tstm cov........CHANCE CHANCE CHANCE
Chc of pcpn (%).70 40 50 40 20 10
Chc of thdr (%).40 30 30 10 10 10
Temp............54 52 51 51 51 53
Dewpoint........52 52 51 51 51 51
RH..............95 100 100 100 100 93
33 ft wind......SE 9 SE 9 N 7 NW 12 NW 12 NW 14
20 ft wind......SE 7 SE 7 N 6 NW 10 NW 10 NW 11
Wind gust.......10 10 8 13
Mix hgt (ft)....400 400 400 400 400 400
VIndx kt-ft/100.4 3 4 4 4 5
Ceiling (kft)...1.5 0.9 0.6 0.7 1.1 3.5
.SATURDAY...
Sky/weather.........Partly sunny (55-65 percent) then becoming
sunny (10-20 percent). Areas of smoke early in
the morning, then smoke.
Chance of pcpn......10 percent.
Chance of thunder...5 percent.
Temperature.........Max 61.
RH..................Min 75 percent.
Dewpoint............53.
33-foot winds.......Northwest winds 8 to 15 mph.
20-foot winds.......Northwest winds 6 to 12 mph.
Mixing height.......300-400 ft AGL.
Ventilation index...Poor (30.0).
Rainfall amount.....0.01 inches.
Ceiling (kft).......5.3 increasing to 6.5 early in the morning.
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
Sky (%).........79 58 24 18 12 10
Weather cov.....AREAS DEFNTE DEFNTE DEFNTE DEFNTE DEFNTE
Weather type....SMOKE SMOKE SMOKE SMOKE SMOKE SMOKE
Tstm cov........
Chc of pcpn (%).10 0 0 0 0 0
Chc of thdr (%).10 0 0 0 0 0
Temp............52 54 59 58 59 60
Dewpoint........52 54 53 53 53 53
RH..............100 100 81 83 82 77
33 ft wind......NW 15 NW 15 NW 15 NW 12 NW 12 NW 8
20 ft wind......NW 12 NW 12 NW 12 NW 10 NW 10 NW 6
Wind gust.......14 14 8
Mix hgt (ft)....300 300 400 300 400 400
VIndx kt-ft/100.5 6 6 5 4 3
Ceiling (kft)...5.3 6.5
$$
Forecaster...NJL
Requested by...Greg Carlson
Type of request...WILDFIRE
.TAG 2617370.3/MQT
.DELDT 07/17/26
.FormatterVersion 2.0.0
.EMAIL greg_carlson@nps.gov