WxDecoder

29C Weather Grindstone Air Harbor Airport

Port Austin, MichiganElevation 640 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KOSC · 32 NM NW · 7 min old
No ceiling, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KOSC
WIND
220@6
steady
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No aviation METAR is published for this airport. The nearest National Weather Service station reports wind from 220° at 4 kt, temperature 15.6C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight mostly cloudy then patchy fog, low near 48F, 3% chance of precipitation. Key risks: thunderstorms in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Thursday: Chance Light Rain. Watch for developing convection and plan alternates.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy then Patchy Fog 48 W 7 kt – 3%
Monday Patchy Fog then Mostly Cloudy 54/41 N 10 kt – 10%
Tuesday Partly Sunny 52/43 E 9 kt – 0%
Wednesday Partly Sunny 66/52 S 8 kt – 6%
Thursday Chance Light Rain 68/49 SW 12 kt – 37% Thunderstorms in the forecast
Friday Partly Sunny 62/50 NW 6 kt – 25%
Saturday Chance Light Rain 64/51 SSE 8 kt – 25%
Sunday Chance Light Rain 62 SSW 9 kt – 34%

Source: National Weather Service (office DTX). Forecast issued 0242Z.

Radar

Radar data: NOAA/NWS MRMS composite reflectivity. For situational awareness only, not a substitute for an official weather briefing.

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RUNWAYS & WIND
1 runway
NESW1836
WIND
No on-field weather data
No reporting weather station on the field, so wind components cannot be computed. See nearby stations below.
RUNWAYS

Runway detail & declared distances

1 runway · longest 1,800 ft

18/36
Dimensions
1,800 x 85 ft
Surface
Turf (fair)
RWY 18178°T
RWY 36358°T

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Field elevation

Field elevation
640 ft MSL

Density and pressure altitude need a current temperature and altimeter from the METAR.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2232Z 6:32 PM
Sunrise
1200Z 8:00 AM
Loggable night
2301Z (7:01 PM local) → 1130Z (7:30 AM local)
end of evening to start of morning civil twilight
Position lights required
2232Z (6:32 PM local) → 1200Z (8:00 AM local)
sunset to sunrise (91.209)
Night passenger currency
2332Z (7:32 PM local) → 1100Z (7:00 AM local)
1 hr after sunset to 1 hr before sunrise (61.57(b))

FAA definitions, shown in Zulu with airport-local time. Verify for your operation.

AIRPORT INFORMATION

Facility & services

Grindstone Air Harbor Airport is in Port Austin, Michigan. Field elevation 640 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UseOpen to the public
TypeSmall airport
ManagerKELLY J HANSON
Manager phone989-269-7299
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATA29C
SectionalLAKE HURON
Center (ARTCC)MINNEAPOLIS
Flight service (AFSS)LANSING
RegionMichigan
CountryUnited States
Coordinates44.0478, -82.9142
Distance from city4 NM E
SERVICES & LIGHTING
Control towerNon-towered
CTAF122.900
FREQUENCIES

Communications

122.900
CTAF
CTAF

Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.

AIRCRAFT ACTIVITY

Traffic patterns

Aircraft activity data is not available for this airport yet.

NEARBY AIRPORTS

Weather reference stations

29C has no on-field report. Nearest reporting station: KOSC (32 NM NW, VFR).

KOSC Oscoda Wurtsmith Airport
32 NM NW
VFR
KCFS Tuscola Area Airport
42 NM SW
VFR
KMBS MBS International Airport
59 NM SW
VFR
KGDW Gladwin Zettel Memorial Airport
68 NM W
VFR
KAPN Alpena County Regional Airport
68 NM NW
VFR
CYZR Chris Hadfield Airport
68 NM SE
VFR
AIRPORT REMARKS

Operational remarks

›DEER & LRG BIRDS ON & INVOF ARPT.
›FOR CD CTC MINNEAPOLIS ARTCC AT 651-463-5588.
›3 FT YELLOW CONES.
›3 FT YELLOW CONES.
›CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 16:1 TO THR OVR +76 FT TREE, 1244 FT DIST, 42 FT L. APCH RATIO 20:1 OVR 27 FT PLINE, 570 FT DIST, 125 FT L/R.
›CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 20:1 OVR 25 FT PLINE, 720 FT DIST, 125 FT L/R.
›MAN-MADE OR NATURAL OBJECTS EXIST WI THE ASP NEEDED TO ENSURE SAFETY IN THE TKOF/LDG OF ACFT.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗29C on OurAirports
FREQUENTLY ASKED
Does 29C have a METAR?
No on-field METAR is issued for 29C. This page uses the nearest reporting station as a reference.
Does 29C have a TAF?
No TAF is issued directly for 29C. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 29C?
29C sits at 640 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 29C?
No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.
This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.