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Grand Lake St Marys Seaplane Base (O12) Area Aviation Weather & Runway Winds

As of 5:15 PM ET, Oct 28, based on the nearest station (KAXV), O12 is currently VFR with winds from 180° at 3 knots, visibility 10+ statute miles, and no ceiling reported.

Aviation weather near Grand Lake St Marys Seaplane Base in St Marys, OH, decoded from the nearest reporting station (KAXV): conditions and runway crosswinds.

Grand Lake St Marys Seaplane Base (O12) is a seaplane base in St Marys, OH. O12 has no weather station of its own. Conditions here are decoded from KAXV, about 9 nm away, the nearest reporting station, and local conditions can differ. It has one runway (09/27), the longest 7,000 ft. The nearest TAF is issued for KDAY.

Ask ATIS AIAsk anything about O12's weather, runways or delays, or search another airport.
VFR
Observed 2115Z (5:15 PM EDT)live · refreshes every 60s

No weather station at this airport: showing the nearest station KAXV, 9.2 nm away.

Wind
180° 3 kt
Visibility
10+ sm
Ceiling
Unlimited
Altimeter
30.21"
Temp / Dew
72°F / 22°C
dew 45°F / 7°C

Wind from the south (180°) at 3 kt, visibility 10+ statute miles, no cloud data, temperature 22°C (72°F), altimeter 30.21 inHg. Conditions are Visual Flight Rules (VFR).

Raw METAR
METAR KAXV 282115Z AUTO 18003KT 10SM CLR 22/07 A3021 RMK AO2

What changed at KAXV (nearest station)?

Since the 2055Z (4:55 PM EDT) report, compared automatically against the latest METAR.

No significant changes since the 2055Z (4:55 PM EDT) report, conditions are holding steady.

Current pilot readout for O12

Based on the nearest station (KAXV), O12 is currently VFR with winds from 180° at 3 knots, visibility 10+ statute miles, and no ceiling reported. Density altitude is approximately 1,550 ft (field elevation 871 ft). O12 does not publish a TAF. The nearest TAF station is KDAY, about 40 nm away.

New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →

Runway wind check

Estimated head/tailwind and crosswind for each runway end from the current reported wind.

RunwayHead / TailCrosswind
09FAV0 kt head3 kt right
270 kt head3 kt left

Open the crosswind calculator to try your own wind and runway numbers →

O12 runways

1 physical runway · 2 runway ends. Each card opens the runway's intelligence page: equipment and lighting, LAHSO, frequencies, today's configuration, predicted use, history and approaches.

  • Runway 09/27
    7,000 × 4000 ft · WATER
    Status not monitored
    Current use
    no stated-runway source at O12
    Wind
    09
    0 kt headwind · 3 kt crosswind from right
    27
    0 kt headwind · 3 kt crosswind from left
    no active equipment NOTAM receivedView Runway Intelligence →

“Current use” is what the facilitystates; wind components are arithmetic on the current METAR against TRUE headings; status reflects NOTAMs received through SWIM, the tower's TFDM record and the D-ATIS — a runway reads “Open” only with a complete NOTAM picture.

24-hour trend

Wind, ceiling and flight category over the last 24 hours.

Wind (kt)Gusts (kt)Bottom strip, flight category:VFRMVFRIFRLIFRNo report
061221Z09Z21Z

Over the last 24 h: wind 3→3 kt, ceiling unlimited → unlimited.

O12 weather radar

Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.

Loading…
Loading radar…

Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap

NOAA NEXRAD composite and lightning, updated about every five minutes; amber frames are HRRR model guidance, not observed radar. Not for navigation.

Pilot reports (PIREPs) within 100 NM of O12

Reported by pilots in flight over the past 6 hours, via aviationweather.gov.

PIREP2127Z (5:27 PM EDT) · 89 NM E of O12 · during descent · C172
smooth turbulence
Show raw report
MFD UA /OV MFD/TM 2127/FLDURD/TP C172/TB SMOOTH/RM RY23
MFD UAHeader: reporting station and UA: a routine pilot report.
OV MFDLocation: fix or navaid, optionally with a radial and distance in NM.
TM 2127Reported at 21:27 UTC.
FLDURDReported during descent.
TP C172Aircraft type reporting.
TB SMOOTHTurbulence: smooth.
RM RY23Remarks.
PIREP1824Z (2:24 PM EDT) · 83 NM NW of O12 · 23,000 ft MSL · B39M
Show raw report
RCR UA /OV RCR/TM 1824/FL230/TP B39M/TB NEG
RCR UAHeader: reporting station and UA: a routine pilot report.
OV RCRLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1824Reported at 18:24 UTC.
FL230Altitude: 23,000 ft MSL.
TP B39MAircraft type reporting.
TB NEGTurbulence: none reported.
PIREP1810Z (2:10 PM EDT) · 96 NM SE of O12 · 5,000 ft MSL · P32R
con light chop turbulence
Show raw report
CMH UA /OV LHQ/TM 1810/FL050/TP P32R/TB CON LGT CHOP/RM SMOOTH AT 070
CMH UAHeader: reporting station and UA: a routine pilot report.
OV LHQLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1810Reported at 18:10 UTC.
FL050Altitude: 5,000 ft MSL.
TP P32RAircraft type reporting.
TB CON LGT CHOPTurbulence: con light chop.
RM SMOOTH AT 070Remarks.
PIREP1627Z (12:27 PM EDT) · 94 NM NE of O12 · altitude unknown · UNKN
Show raw report
PCW UA /OV PCW /TM 1627 /FLUNKN /TP UNKN /RM PILOT OG PCW NOT SEEING HZ AS REPORTED ON METAR
PCW UAHeader: reporting station and UA: a routine pilot report.
OV PCWLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1627Reported at 16:27 UTC.
FLUNKNAltitude unknown.
TP UNKNAircraft type reporting.
RM PILOT OG PCW NOT SEEING H…Remarks.

⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.

Recent aviation weather trends at O12

From ATIS Alerts' hourly weather history.

Over the past 24 hours, the nearest station KAXV reported mostly VFR across 72 observations, with 0 flight-category changes. The lowest ceiling was 11,000 ft. Wind most often came from the S.

Last 24 hours
VFR 100%
Wind avg/max: 2/7 kt
Max gust: -
Lowest ceiling: 11,000 ft
Lowest vis: -
Prevailing wind: S
Category changes: 0
Last 7 days
VFR 86%MVFR 6%IFR 3%LIFR 4%
Wind avg/max: 1/7 kt
Max gust: -
Lowest ceiling: 100 ft
Lowest vis: 0.25 sm
Prevailing wind: S
Category changes: 17

Most recent change: MVFR → VFR

Wind-favored runway - past 30 days

Share of hours each runway had the most headwind. From wind reports, not ATC assignments.

27
56%
09
44%

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No live weather from O12

Live crosswind meter

O12 has no weather feed online, so the wind comes from KAXV, 9.2 nm away.

N09273 kt
Headwind
0 kt
Crosswind (from the right)
3 kt

Wind is 90° off runway 09, the end with the most headwind right now.

Have a weather station at O12? Help us make your field's weather available to every pilot, free. Add your field's wx station →

Water · 7,000 ft. Headings from FAA runway data. Not for navigation.

Field aerial

North up

Aerial photo of Grand Lake St Marys Seaplane Base (O12)
N ↑

Imagery: USGS The National Map (public domain). Something off? ✏️ Suggest an edit

Airport info

From the FAA airport record (cycle 2026-10-01) and OurAirports.

Services

Fuel
100LL
Attended
Apr-Nov Daily 0800-1700 local
Control tower
None

Airport

Type
Seaplane base
FAA LID
O12
City
St Marys
State
Ohio
Country
United States
Elevation
871 ft
Coordinates
40.5410, -84.4907
Runways
1 physical runway · 2 runway ends
Longest runway
7,000 ft
Weather reporting
Nearest station KAXV
TAF
Nearest KDAY
Time zone
America/New_York
Sunset in
1h 10m

Run a flight school, FBO, or club here? Embed O12's live status on your website, free →

Nearby airports

Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.

VFRMVFRIFRLIFRNo report

RC flying fields nearby

AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.

All RC flying fields →

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Pilot PIREPs for Grand Lake St Marys Seaplane Base (O12)

Community-submitted

Community-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.

Read recent community-submitted pilot notes for Grand Lake St Marys Seaplane Base, including runway conditions, wildlife activity, FBO/fuel notes, turbulence, ramp access, and local airport tips.

⚠️ Pilot PIREPs on ATIS Alerts are community-submitted airport notes for situational awareness only. They are not official FAA PIREPs, NOTAMs, weather briefings, airport advisories, or flight-planning guidance. Always verify with official FAA/NWS sources, airport management, ATC, and current publications.

No Pilot PIREPs have been submitted for O12 yet. Recently flew here? Help the next pilot by leaving a quick airport note.

Pilot PIREPs are community pilot notes for situational awareness only, not official FAA PIREPs or advisories. Verify with official sources. Notes are moderated before they appear; helpful marks and reports help us keep them useful.

⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.

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