WxDecoder

US-4138 Weather Kaiser Permanente Antioch Medical Center Helport

Antioch, CaliforniaElevation 220 ftHeliport
OFF-FIELD REFERENCE
Nearest report: KCCR · 14 NM W · 59 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 · KCCR
WIND
140@4
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 28° at 6 kt, temperature 11.67C. This observation is older than usual, so treat it with extra caution. Treat this as supplemental, not an aviation observation. Forecast suggests tonight partly cloudy, low near 53F, 0% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
Tonight Partly Cloudy 53 W 4 kt – 0%
Monday Sunny 69/49 WSW 9 kt 18 kt 0%
Tuesday Sunny 67/49 WSW 5 kt – 0%
Wednesday Mostly Sunny 67/51 WNW 3 kt – 1%
Thursday Partly Sunny 65/48 WSW 5 kt – 3%
Friday Sunny 62/47 WSW 8 kt – 28%
Saturday Chance Light Rain 60/47 W 3 kt – 30%
Sunday Chance Light Rain 60 NW 4 kt – 25%

Source: National Weather Service (office MTR). Forecast issued 0352Z.

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 US-4138. Enter a runway number or heading to estimate wind components.
FIELD CONDITIONS

Field elevation

Field elevation
220 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0116Z 6:16 PM
Sunrise
1426Z 7:26 AM
Loggable night
0143Z (6:43 PM local) → 1359Z (6:59 AM local)
end of evening to start of morning civil twilight
Position lights required
0116Z (6:16 PM local) → 1426Z (7:26 AM local)
sunset to sunrise (91.209)
Night passenger currency
0216Z (7:16 PM local) → 1326Z (6:26 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

Kaiser Permanente Antioch Medical Center Helport is in Antioch, California. Field elevation 220 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
TypeHeliport
CHARTS & AIRSPACE
ICAO / IATAUS-4138
RegionCalifornia
CountryUnited States
Coordinates37.9519, -121.7743
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

US-4138 traffic patterns

2026-07-03 to 2026-10-18, 15 days observed · data 2026-10-23

Medium confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
1.8
AVG OPS/DAY
3.2
Activity trend over 6 days: falling, from 9 to 1 operations per dayOperations trend (6 days)

Busiest day: Sat · Busiest month: Aug

FLEET MIX
Unknown 49%Piston single 31%Helicopter 21%

Fleet composition unclear from available data.

TOP AIRCRAFT TYPES
›UNKN (Unknown) · ~5 landings/mo
›B212 (Helicopter) · ~1 landings/mo
›B407 (Helicopter) · ~1 landings/mo
›BT36 (Piston single) · ~1 landings/mo
›C172 (Piston single) · ~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

US-4138 has no on-field report. Nearest reporting station: KCCR (14 NM W, VFR).

KCCR Buchanan Field
14 NM W
VFR
KLVK Livermore Municipal Airport
16 NM S
VFR
KSUU Travis Air Force Base
20 NM N
VFR
KHWD Hayward Executive Airport
24 NM SW
VFR
KOAK Oakland San Francisco Bay Airport
25 NM SW
VFR
KSCK Stockton Metropolitan Airport
26 NM E
VFR
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗US-4138 on OurAirports
FREQUENTLY ASKED
Does US-4138 have a METAR?
No on-field METAR is issued for US-4138. This page uses the nearest reporting station as a reference.
Does US-4138 have a TAF?
No TAF is issued directly for US-4138. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at US-4138?
US-4138 sits at 220 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for US-4138?
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.