Greenwood Lake Airport (K4N1) Area Aviation Weather & Runway Winds
Aviation weather near Greenwood Lake Airport in West Milford, NJ, decoded from the nearest reporting station (KFWN) — conditions, runway crosswinds, and free Telegram airport alerts.
Greenwood Lake Airport (K4N1) is a general aviation airport serving pilots in and around West Milford, NJ at 791 ft. K4N1 has no weather station of its own — conditions here are decoded from KFWN, about 13 nm away, the nearest reporting station, and local conditions can differ. Its 2 runways (06, 24) — longest 3,471 ft — are checked against the current wind in the crosswind table below. CTAF is 122.9. Track it in the ATIS Alerts Telegram bot to get alerts read from KFWN, the station this page is based on.
No weather station at this airport — showing the nearest station KFWN, 13.2 nm away.
Wind calm, visibility 10+ statute miles, broken clouds at 1,300 ft, broken clouds at 2,800 ft, overcast at 3,600 ft, temperature 20°C (68°F), altimeter 29.59 inHg. Conditions are Marginal VFR (MVFR), ceiling 1,300 ft.
SPECI KFWN 290427Z AUTO 00000KT 10SM BKN013 BKN028 OVC036 20/ A2959 RMK AO2 LTG DSNT N AND NE T0200 $
What changed at KFWN (nearest station)?
Since the 0353Z (11:53 PM EDT) report — compared automatically against the latest METAR.
- Flight category dropped from VFR to MVFR.
- Ceiling dropped from 9,500 ft to 1,300 ft.
The latest report is an off-schedule special (SPECI) — issued because conditions changed significantly. What is a SPECI? →
This is exactly what ATIS Alerts watches for you — get a Telegram message when K4N1's weather changes, free →
Current pilot readout for K4N1
Based on the nearest station (KFWN), K4N1 is currently MVFR with calm winds, visibility 10+ statute miles, and a 1,300 ft ceiling. Density altitude is approximately 2,000 ft (field elevation 791 ft). K4N1 does not publish a TAF — the nearest TAF station is KTEB, about 21 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 K4N1 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 K4N1. 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 |
|---|---|---|---|---|
| 06 | 3,471 ft | ASP | — | — |
| 24 | 3,471 ft | ASP | — | — |
Open the crosswind calculator — try your own wind and runway numbers →
24-hour trend
Wind, ceiling and flight category over the last 24 hours.
Over the last 24 h: wind 0→0 kt, ceiling 6,000 ft → 1,300 ft.
K4N1 weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast — drag to pan, tap ⚡ to toggle lightning.
Live weather radar around Greenwood Lake Airport in West Milford, NJ: 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 K4N1 is headed.
Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © OpenStreetMap © CARTO
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 K4N1
Reported by pilots in flight over the past 6 hours — via aviationweather.gov.
Show raw report
TEB UA /OV KTEB010004/TM 0425/FL015/TP C700/WX -RA/TB NEG/RM ON APPROACH RWY 19
TEB UAHeader — reporting station and UA: a routine pilot report.OV KTEB010004Location — fix or navaid, optionally with a radial and distance in NM.TM 0425Reported at 04:25 UTC.FL015Altitude: 1,500 ft MSL.TP C700Aircraft type reporting.WX -RAWeather and flight visibility observed.TB NEGTurbulence: none reported.RM ON APPROACH RWY 19Remarks.Show raw report
DXR UA /OV CMK180070/TM 0409/FL190/TP B752/TB MOD 190-150
DXR UAHeader — reporting station and UA: a routine pilot report.OV CMK180070Location — fix or navaid, optionally with a radial and distance in NM.TM 0409Reported at 04:09 UTC.FL190Altitude: 19,000 ft MSL.TP B752Aircraft type reporting.TB MOD 190-150Turbulence: moderate 19,000–15,000 ft.Show raw report
BDL UA /OV BDL/TM 0407/FL031/TP B763/SK BKN031/RM DURD RY 24
BDL UAHeader — reporting station and UA: a routine pilot report.OV BDLLocation — fix or navaid, optionally with a radial and distance in NM.TM 0407Reported at 04:07 UTC.FL031Altitude: 3,100 ft MSL.TP B763Aircraft type reporting.SK BKN031Sky condition — cloud bases and tops in hundreds of feet MSL.RM DURD RY 24Remarks.Show raw report
TEB UA /OV KTEB270015/TM 0353/FL090/TP B350/TB LGT/RM DURC
TEB UAHeader — reporting station and UA: a routine pilot report.OV KTEB270015Location — fix or navaid, optionally with a radial and distance in NM.TM 0353Reported at 03:53 UTC.FL090Altitude: 9,000 ft MSL.TP B350Aircraft type reporting.TB LGTTurbulence: light.RM DURCRemarks.Show raw report
ARP UAL228 4116N 07541W 0346 F350 TB MODERATE SK IN CLOUDS IC NONE
ARP UAL228 4116N 07541W 0346…Header — reporting station and UA: a routine pilot report.Show raw report
ARP UAL932 4203N 07518W 0345 F360 192/054KT TB CONT LGT CHOP IC
ARP UAL932 4203N 07518W 0345…Header — reporting station and UA: a routine pilot report.Show raw report
PTW UA /OV PTW/TM 0326/FL290/TP C56X/TA M17/IC TRACE-LGT CLR
PTW UAHeader — reporting station and UA: a routine pilot report.OV PTWLocation — fix or navaid, optionally with a radial and distance in NM.TM 0326Reported at 03:26 UTC.FL290Altitude: 29,000 ft MSL.TP C56XAircraft type reporting.TA M17Outside air temperature, °C.IC TRACE-LGT CLRIcing: trace - light clear.Show raw report
BDL UA /OV BDL/TM 0313/FL025/TP A320/SK BKN025/RM DURD RY 24
BDL UAHeader — reporting station and UA: a routine pilot report.OV BDLLocation — fix or navaid, optionally with a radial and distance in NM.TM 0313Reported at 03:13 UTC.FL025Altitude: 2,500 ft MSL.TP A320Aircraft type reporting.SK BKN025Sky condition — cloud bases and tops in hundreds of feet MSL.RM DURD RY 24Remarks.⚠️ PIREPs are unverified pilot reports. Not for operational use — conditions change between reports.
Recent aviation weather trends at K4N1
From ATIS Alerts' hourly weather history.
Over the past 24 hours, the nearest station KFWN reported a mix of conditions, most often marginal VFR across 74 observations, with 36 flight-category changes. The strongest gust reached 22 kt, the lowest ceiling was 500 ft. Wind most often came from the NE.
Most recent change: VFR → MVFR
Most recent change: MVFR → VFR
- 06
- 66%
- 24
- 34%
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Nearby TFRs
Active FAA TFRs near K4N1
FAA TFR data shows active temporary flight restrictions near K4N1.
View all active US TFRs → · Official FAA TFR ↗
Verify with official FAA TFR sources before flight.
Airport facts
Reference data from the OurAirports dataset.
- Type
- General aviation airport
- FAA LID
- 4N1
- City
- West Milford
- State
- New Jersey
- Country
- United States
- Elevation
- 791 ft
- Coordinates
- 41.1282, -74.3467
- Runways
- 2
- Longest runway
- 3,471 ft
- Weather reporting
- Nearest station KFWN
- TAF
- Nearest KTEB
- CTAF
- 122.9 MHz
- Time zone
- America/New_York
- Next sunset
- 19h 31m
Run a flight school, FBO, or club here? Embed K4N1'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.
- Bergen County Silent Fliers - Warwick Airport — Greenwood Lake, NY · 8 mi
- RCRCC - Rockland County RC Club, Sterling Forest — Tuxedo Park, NY · 11 mi
- Wayne Modelers - Barbour Pond Park — Wayne, NJ · 13 mi
K4N1 weather — frequently asked
What runways are available at K4N1?+
K4N1 has 2 runways — 06, 24; the longest is 3,471 ft. This page computes the live crosswind for each runway end from the current wind.
Where does the weather shown for K4N1 come from?+
Greenwood Lake Airport does not have its own weather station. Conditions shown here come from the nearest reporting station, KFWN, about 13 nm away — close enough for situational awareness, but local conditions at K4N1 can differ.
Does K4N1 have a TAF?+
No — K4N1 does not publish its own TAF. The nearest TAF station is KTEB, about 21 nm away.
Does K4N1 broadcast D-ATIS?+
No — K4N1 does not broadcast D-ATIS. Alerts for K4N1 from the ATIS Alerts bot (@atisalerts_bot) are based on its METAR (via the nearest reporting station) instead.
Pilot PIREPs for Greenwood Lake Airport (K4N1)
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 Greenwood Lake Airport, 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 K4N1 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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