WxDecoder

US-9140 Weather Hidden Valley Lake Airport

Middletown, CaliforniaElevation 1,010 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KSTS · 21 NM SW · 56 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 · KSTS
WIND
Calm
no steady wind
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
ACTIVE NWS ALERTS

Active weather alerts

Frost AdvisoryMinor · Expected · Likely
25 0349Z to 25 1700Z
Coastal Mendocino; Northwestern Interior Mendocino; Northeastern Interior Mendocino; Southwestern Interior Mendocino; Southeastern Interior Mendocino; Northern Lake; Western Lake; Eastern Lake
* WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Mendocino County, Northern Lake, Western Lake, and Eastern Lake mainly in the valleys that remain clear. * WHEN...Until 10 AM PDT Sunday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Take steps now to protect tender plants from the cold.

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 aviation METAR is published for this airport. The nearest National Weather Service station reports wind from 288° at 4 kt, gusting 10 kt, temperature 12.22C. This observation is older than usual, so treat it with extra caution. Treat this as supplemental, not an aviation observation. Forecast suggests sunday partly sunny, high near 73F, low near 38F, 1% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
Sunday Partly Sunny 73/38 SE 5 kt – 1%
Monday Sunny 68/37 WNW 7 kt 16 kt 1%
Tuesday Patchy Frost then Sunny 70/39 NW 4 kt – 0%
Wednesday Mostly Sunny 69/38 NW 3 kt – 1%
Thursday Areas Of Fog then Mostly Sunny 66/34 WNW 4 kt – 10%
Friday Slight Chance Light Rain 62/33 WNW 4 kt – 20%
Saturday Patchy Fog 62 NNW 3 kt – 24%

Source: National Weather Service (office EKA). Forecast issued 1049Z.

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-9140. Enter a runway number or heading to estimate wind components.
FIELD CONDITIONS

Field elevation

Field elevation
1,010 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
0147Z (6:47 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

Hidden Valley Lake Airport is in Middletown, California. Field elevation 1,010 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
TypeSmall airport
CHARTS & AIRSPACE
ICAO / IATAUS-9140
RegionCalifornia
CountryUnited States
Coordinates38.8076, -122.5901
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

Traffic patterns

Aircraft activity data is not available for this airport yet.

NEARBY AIRPORTS

Weather reference stations

US-9140 has no on-field report. Nearest reporting station: KSTS (21 NM SW, VFR).

KSTS Charles M. Schulz Sonoma County Airport
21 NM SW
VFR
KUKI Ukiah Municipal Airport
34 NM NW
VFR
KAPC Napa County Airport
39 NM S
VFR
KDVO Marin County Airport - Gnoss Field
40 NM S
VFR
KSUU Travis Air Force Base
45 NM SE
VFR
KSMF Sacramento International Airport
47 NM E
VFR
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗US-9140 on OurAirports
FREQUENTLY ASKED
Does US-9140 have a METAR?
No on-field METAR is issued for US-9140. This page uses the nearest reporting station as a reference.
Does US-9140 have a TAF?
No TAF is issued directly for US-9140. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at US-9140?
US-9140 sits at 1,010 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for US-9140?
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.