WxDecoder

CN19 Weather Las Serpientes Airport

Knightsen, CaliforniaElevation 10 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KLVK · 17 NM SW · 51 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 · KLVK
WIND
Calm
no steady wind
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 sunday mostly sunny, high near 74F, low near 50F, 0% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
Sunday Mostly Sunny 74/50 N 2 kt – 0%
Monday Sunny 72/46 WSW 8 kt – 0%
Tuesday Sunny 71/47 WNW 4 kt – 0%
Wednesday Patchy Fog then Partly Sunny 69/49 WNW 3 kt – 1%
Thursday Partly Sunny 67/46 W 4 kt – 12%
Friday Mostly Sunny 64/44 W 5 kt – 19%
Saturday Patchy Fog 64 WNW 4 kt – 23%

Source: National Weather Service (office MTR). Forecast issued 0944Z.

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 CN19. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 1,900 ft

16/34
Dimensions
1,900 x 75 ft
Surface
Turf
Edge lights
HIGH
RWY 16
RWY 34
Displaced threshold200 ft

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
10 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0117Z 6:17 PM
Sunrise
1424Z 7:24 AM
Loggable night
0143Z (6:43 PM local) → 1357Z (6:57 AM local)
end of evening to start of morning civil twilight
Position lights required
0117Z (6:17 PM local) → 1424Z (7:24 AM local)
sunset to sunrise (91.209)
Night passenger currency
0217Z (7:17 PM local) → 1324Z (6:24 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

Las Serpientes Airport is in Knightsen, California. Field elevation 10 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeSmall airport
ManagerBRUCE CLEGG
Manager phone925-698-4831
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATACN19
SectionalSAN FRANCISCO
Center (ARTCC)OAKLAND
Flight service (AFSS)OAKLAND
RegionCalifornia
CountryUnited States
Coordinates37.9331, -121.6130
Distance from city2 NM SE
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

CN19 traffic patterns

2026-06-13 to 2026-10-20, 44 days observed · data 2026-10-23

Medium confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
0.4
AVG OPS/DAY
1.6
Activity trend over 5 days: flat, from 1 to 1 operations per dayOperations trend (5 days)

Busiest day: Fri · Busiest month: Jun

FLEET MIX
Helicopter 66%Piston single 19%Unknown 16%

Mostly rotorcraft.

TOP AIRCRAFT TYPES
›B06 (Helicopter) · ~5 landings/mo
›A5 (Unknown) · ~2 landings/mo
›AS50 (Helicopter) · ~1 landings/mo
›C172 (Piston single) · ~1 landings/mo
›PA18 (Piston single) · ~1 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly rotorcraft.

›B06 (Helicopter)

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

CN19 has no on-field report. Nearest reporting station: KLVK (17 NM SW, VFR).

KLVK Livermore Municipal Airport
17 NM SW
VFR
KSCK Stockton Metropolitan Airport
18 NM E
VFR
KCCR Buchanan Field
21 NM W
VFR
KSUU Travis Air Force Base
25 NM NW
VFR
KHWD Hayward Executive Airport
29 NM SW
VFR
KOAK Oakland San Francisco Bay Airport
32 NM SW
VFR
AIRPORT REMARKS

Operational remarks

›FOR CD CTC NORCAL APCH AT 916-361-0516.
›DSPLCD THLD RY 34 MARKED WITH WHITE BOARDS.
›CELL 925-698-4831; EMAIL CLEGGB@GMAIL.COM.
›OWNER DESIRES ARPT NOT BE CHARTED.
›PROVIDED VFR OPNS, PRIVATE USE, OBSTRUCTION FREE INGRESS AND EGRESS AND ALL OPNS CONDUCTED IN ACCORDANCE WITH THE OVERLYING CLASS OF AIRSPACE.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗CN19 on OurAirports
FREQUENTLY ASKED
Does CN19 have a METAR?
No on-field METAR is issued for CN19. This page uses the nearest reporting station as a reference.
Does CN19 have a TAF?
No TAF is issued directly for CN19. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at CN19?
CN19 sits at 10 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for CN19?
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.