Grand Lake St Marys Seaplane Base (O12) Area Aviation Weather & Runway Winds
Aviation weather near Grand Lake St Marys Seaplane Base in St Marys, OH, decoded from the nearest reporting station (KAXV): conditions, runway crosswinds, and free Telegram airport alerts.
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. Its 2 runways (09, 27), longest 7,000 ft, are checked against the current wind in the crosswind table below. The nearest TAF is issued for KDAY. Track it in the ATIS Alerts Telegram bot to get alerts read from KAXV, the station this page is based on.
No weather station at this airport: showing the nearest station KAXV, 9.2 nm away.
Wind calm, visibility 3 statute miles, no cloud data, temperature 18°C (64°F), altimeter 29.93 inHg. Conditions are Marginal VFR (MVFR).
METAR KAXV 130915Z AUTO 00000KT 3SM BR CLR 18/18 A2993 RMK AO2
What changed at KAXV (nearest station)?
Since the 0855Z (4:55 AM EDT) report, compared automatically against the latest METAR.
No significant changes since the 0855Z report, conditions are holding steady.
This is exactly what ATIS Alerts watches for you: get a Telegram message when O12's weather changes, free →
Current pilot readout for O12
Based on the nearest station (KAXV), O12 is currently MVFR with calm winds, visibility 3 statute miles, and no ceiling reported. Density altitude is approximately 1,450 ft (field elevation 871 ft). O12 does not publish a TAF. The nearest TAF station is KDAY, about 40 nm away.
⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →
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Track O12 free on TelegramRunway wind check
Estimated head/tailwind and crosswind for each runway end from the current reported wind.
Use this section to quickly compare current wind alignment across available runways at O12. This is intended as a planning aid only and should not replace official performance calculations or pilot judgment.
Current wind is calm: calm wind is not a factor for runway selection, and with no wind there is no head/tail or crosswind component to compute. Live numbers return automatically once a report includes a wind direction.
| Runway | Length | Surface | Head / Tail | Crosswind |
|---|---|---|---|---|
| 09 | 7,000 ft | WATER | - | - |
| 27 | 7,000 ft | WATER | - | - |
Open the crosswind calculator to try your own wind and runway numbers →
24-hour trend
Wind, ceiling and flight category over the last 24 hours.
Over the last 23 h: wind 0→0 kt, ceiling 8,000 ft → unlimited.
O12 weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.
Live weather radar around Grand Lake St Marys Seaplane Base in St Marys, OH: the NOAA/NWS NEXRAD composite updates about every five minutes, with NOAA lightning strike density overlaid. The loop plays the past 50 minutes, then continues into a future-radar forecast (+1 to +4 hours, NOAA HRRR model) so you can see where precipitation around O12 is headed.
Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap
Forecast frames (amber label) are HRRR model guidance, not observed radar. Lightning strike density appears as a blue-white glow when strikes are detected in view. Radar and lightning coverage are limited in parts of Alaska, Hawaii, and offshore areas. Not for navigation.
Pilot reports (PIREPs) within 100 NM of O12
Reported by pilots in flight over the past 6 hours, via aviationweather.gov.
Show raw report
CMH UA /OV CMH/TM 0933/FL020/TP E75L/SK B003 OVC/RM DURC
CMH UAHeader: reporting station and UA: a routine pilot report.OV CMHLocation: fix or navaid, optionally with a radial and distance in NM.TM 0933Reported at 09:33 UTC.FL020Altitude: 2,000 ft MSL.TP E75LAircraft type reporting.SK B003 OVCSky condition: cloud bases and tops in hundreds of feet MSL.RM DURCRemarks.Show raw report
PKB UA /OV HOC/TM 0901/FL370/TP A320/TB LGT CHOP
PKB UAHeader: reporting station and UA: a routine pilot report.OV HOCLocation: fix or navaid, optionally with a radial and distance in NM.TM 0901Reported at 09:01 UTC.FL370Altitude: 37,000 ft MSL.TP A320Aircraft type reporting.TB LGT CHOPTurbulence: light chop.Show raw report
CVG UA /OV CVG/TM 0423/FL450/TP CL30/TB LGT CHOP
CVG UAHeader: reporting station and UA: a routine pilot report.OV CVGLocation: fix or navaid, optionally with a radial and distance in NM.TM 0423Reported at 04:23 UTC.FL450Altitude: 45,000 ft MSL.TP CL30Aircraft type reporting.TB LGT CHOPTurbulence: light chop.⚠️ 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 a mix of conditions, most often VFR across 71 observations, with 16 flight-category changes. The lowest ceiling was 400 ft. Wind most often came from the S.
Most recent change: VFR → MVFR
Most recent change: VFR → MVFR
- 09/27
- 100%
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We'll message you on Telegram when a new report moves the picture near O12 (Grand Lake St Marys Seaplane Base): alerts read from KAXV, the station this page uses.
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Airport facts
Reference data from the OurAirports dataset.
- Type
- Seaplane base
- FAA LID
- O12
- City
- St Marys
- State
- Ohio
- Country
- United States
- Elevation
- 871 ft
- Coordinates
- 40.5410, -84.4907
- Runways
- 2
- Longest runway
- 7,000 ft
- Weather reporting
- Nearest station KAXV
- TAF
- Nearest KDAY
- Time zone
- America/New_York
- Next sunset
- 14h 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.
Within 25 NM
8 airports+2 more within 25 NM
25–50 NM
8 airports+2 more within 50 NM
50–100 NM
8 airports+2 more within 100 NM
RC flying fields nearby
AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.
- Celina Eagle Lodge , Celina, OH · 3 mi
- Noble Township Community Center , St Marys, OH · 6 mi
- Auglaize Buzzard Baiters - Salem Noble Rd , St. Marys, OH · 8 mi
O12 weather: frequently asked
What runways are available at O12?+
O12 has 2 runways: 09, 27; the longest is 7,000 ft. This page computes the live crosswind for each runway end from the current wind.
Where does the weather shown for O12 come from?+
Grand Lake St Marys Seaplane Base does not have its own weather station. Conditions shown here come from the nearest reporting station, KAXV, about 9 nm away, close enough for situational awareness, but local conditions at O12 can differ.
Does O12 have a TAF?+
No. O12 does not publish its own TAF. The nearest TAF station is KDAY, about 40 nm away.
Does O12 broadcast D-ATIS?+
No. O12 does not broadcast D-ATIS. Alerts for O12 from the ATIS Alerts bot (@atisalerts_bot) are based on its METAR (via the nearest reporting station) instead.
Pilot PIREPs for Grand Lake St Marys Seaplane Base (O12)
Community-submittedCommunity-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.
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⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
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