WxDecoder

JMC Weather Commodore Center Heliport

Mill Valley, CaliforniaElevation 7 ftHeliport
OFF-FIELD REFERENCE
Nearest report: KDVO · 16 NM N · 19 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 · KDVO
WIND
120@5
steady
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
ACTIVE NWS ALERTS

Active weather alerts

Coastal Flood AdvisoryMinor · Expected · Likely
26 1600Z to 29 2200Z
Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast
* WHAT...Up to 1.9ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Pacific Coast. * WHEN...From 9 AM Monday to 3 PM PDT Thursday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restric…
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

Alerts from the National Weather Service. For situational awareness only; always confirm against an official briefing.

FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No current METAR is available for this airport, so there is no observed aviation report to summarize. Forecast suggests this afternoon partly sunny, high near 67F, low near 51F, 1% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
This Afternoon Partly Sunny 67/51 WSW 6 kt – 1%
Monday Sunny 63/48 W 14 kt 19 kt 1%
Tuesday Mostly Sunny 61/48 WNW 13 kt 18 kt 0%
Wednesday Mostly Sunny 61/49 NW 7 kt – 0%
Thursday Partly Sunny 59/48 WNW 14 kt – 8%
Friday Mostly Sunny then Slight Chance Light Rain 57/47 WNW 14 kt – 36%
Saturday Chance Light Rain 56/46 WNW 6 kt – 36%

Source: National Weather Service (office MTR). Forecast issued 2333Z.

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
Crosswind calculator
No runway layout is available for JMC. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 100 ft

H1
Dimensions
100 x 100 ft
Surface
Asphalt
RWY H1
Traffic patternLeft

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
7 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0119Z 6:19 PM
Sunrise
1429Z 7:29 AM
Loggable night
0146Z (6:46 PM local) → 1402Z (7:02 AM local)
end of evening to start of morning civil twilight
Position lights required
0119Z (6:19 PM local) → 1429Z (7:29 AM local)
sunset to sunrise (91.209)
Night passenger currency
0219Z (7:19 PM local) → 1329Z (6:29 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

Commodore Center Heliport is in Mill Valley, California. Field elevation 7 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeHeliport
ManagerAARON SINGER
Manager phone415-332-4843
AttendedALL MON-FRI, 0600–2000
CHARTS & AIRSPACE
ICAO / IATAJMC
SectionalSAN FRANCISCO
Center (ARTCC)OAKLAND
Flight service (AFSS)OAKLAND
RegionCalifornia
CountryUnited States
Coordinates37.8785, -122.5130
Distance from city2 NM NW
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

JMC traffic patterns

2026-06-12 to 2026-10-19, 38 days observed · data 2026-10-23

Medium confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
0.3
AVG OPS/DAY
1
Activity trend over 8 days: flat, from 1 to 1 operations per dayOperations trend (8 days)

Busiest day: Thu · Busiest month: Jul

FLEET MIX
Unknown 79%Helicopter 21%

Fleet composition unclear from available data.

TOP AIRCRAFT TYPES
›UNKN (Unknown) · ~7 landings/mo
›DHC2 (Unknown) · ~2 landings/mo
›EC30 (Helicopter) · ~2 landings/mo
›SAVG (Unknown) · ~1 landings/mo
›R44 (Helicopter) · ~1 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly aircraft of unknown type.

›UNKN (Unknown)

This is an estimate based on repeated flight patterns, not registration data. Do not rely on it to identify specific aircraft or owners.

Data limitations (4)
›ADS-B coverage is incomplete; counts are an observed lower bound, not official totals.
›Some aircraft do not transmit usable ADS-B and are not counted.
›Aircraft types and based estimates are inferred and may be wrong.
›This is not official ATC, FAA, or airport data.
NEARBY AIRPORTS

Weather reference stations

JMC has no on-field report. Nearest reporting station: KDVO (16 NM N, VFR).

KDVO Marin County Airport - Gnoss Field
16 NM N
VFR
KOAK Oakland San Francisco Bay Airport
17 NM SE
VFR
KSFO San Francisco International Airport
17 NM SE
VFR
KHAF Half Moon Bay Airport
22 NM S
VFR
KCCR Buchanan Field
23 NM E
VFR
KHWD Hayward Executive Airport
23 NM SE
VFR
AIRPORT REMARKS

Operational remarks

›FOR CD CTC NORCAL APCH AT 916-361-3748.
›ADDNL 100 X 50' GRAVEL NE END.
›HELIPORT H SURROUNDED IN TRIANGLE-F.
›AC 2'' SUPPORTING S-61.
›ADDITIONAL ADDRESS: 242 REDWOOD HWY MILL VALLEY, CA 94941
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗JMC on OurAirports
FREQUENTLY ASKED
Does JMC have a METAR?
No on-field METAR is issued for JMC. This page uses the nearest reporting station as a reference.
Does JMC have a TAF?
No TAF is issued directly for JMC. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at JMC?
JMC sits at 7 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for JMC?
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.