WxDecoder

42IL Weather Lynn Heliport

Union, IllinoisElevation 870 ftHeliport
OFF-FIELD REFERENCE
Nearest report: KDPA · 21 NM SE · 57 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 · KDPA
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 150° at 4 kt, visibility 10 SM, temperature 13.5C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight mostly cloudy then patchy fog, low near 49F, 2% chance of precipitation. Key risks: thunderstorms in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Thursday: Chance Rain Showers then Slight Chance Showers And Thunderstorms. Watch for developing convection and plan alternates.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy then Patchy Fog 49 WSW 9 kt – 2%
Monday Patchy Fog then Mostly Cloudy 62/47 NE 13 kt – 3%
Tuesday Mostly Cloudy 67/54 SE 9 kt – 10%
Wednesday Mostly Sunny 71/57 SSW 9 kt – 18%
Thursday Chance Rain Showers then Slight Chance Showers And Thunderstorms 74/54 SW 9 kt – 26% Thunderstorms in the forecast
Friday Chance Rain Showers 73/56 SSE 4 kt – 39%
Saturday Chance Rain Showers 70/55 SSE 4 kt – 52%
Sunday Chance Rain Showers 68 SW 4 kt – 34%

Source: National Weather Service (office LOT). Forecast issued 0248Z.

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 42IL. 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
Turf (good)
RWY H1

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
870 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2257Z 5:57 PM
Sunrise
1219Z 7:19 AM
Loggable night
2326Z (6:26 PM local) → 1150Z (6:50 AM local)
end of evening to start of morning civil twilight
Position lights required
2257Z (5:57 PM local) → 1219Z (7:19 AM local)
sunset to sunrise (91.209)
Night passenger currency
2357Z (6:57 PM local) → 1119Z (6:19 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

Lynn Heliport is in Union, Illinois. Field elevation 870 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeHeliport
ManagerTIMOTHY LYNN
Manager phone847-833-3830
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATA42IL
SectionalCHICAGO
Center (ARTCC)CHICAGO
Flight service (AFSS)KANKAKEE
RegionIllinois
CountryUnited States
Coordinates42.2033, -88.4975
Distance from city3 NM SE
SERVICES & LIGHTING
Control towerNon-towered
AIRCRAFT ACTIVITY

42IL traffic patterns

2026-06-13 to 2026-09-25, 5 days observed · data 2026-10-23

Low confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
0.5
AVG OPS/DAY
1
Activity trend over 2 days: flat, from 1 to 1 operations per dayOperations trend (2 days)

Busiest day: Mon · Busiest month: Aug

FLEET MIX
Turboprop 62%Piston single 38%

Mostly turboprop aircraft.

TOP AIRCRAFT TYPES
›A660 (Turboprop) · ~4 landings/mo
›P28A (Piston single) · ~1 landings/mo
›ST75 (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 turboprop aircraft.

›A660 (Turboprop)

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

42IL has no on-field report. Nearest reporting station: KDPA (21 NM SE, VFR).

KDPA Dupage Airport
21 NM SE
VFR
KARR Aurora Municipal Airport
26 NM S
VFR
KRFD Chicago Rockford International Airport
27 NM W
VFR
KORD Chicago O'Hare International Airport
30 NM SE
VFR
KUGN Waukegan National Airport
31 NM NE
VFR
KENW Kenosha Regional Airport
35 NM NE
VFR
AIRPORT REMARKS

Operational remarks

›PRVDD TFC STAYS BLO TPA OF (5LL7); APCH USING 050 & 160 DEG; DEP USING 230 & 340 DEG; AREA IS APPROPRIATELY MARKED; WIND INDICATOR IS MAINTAINED; COMPLY WITH CFR 91.126 (B)(2).
›FOR CD CTC CHICAGO APCH AT 847-289-0926.
›BLDGS, TREES & POWER LINES ALL QUADRANTS.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗42IL on OurAirports
FREQUENTLY ASKED
Does 42IL have a METAR?
No on-field METAR is issued for 42IL. This page uses the nearest reporting station as a reference.
Does 42IL have a TAF?
No TAF is issued directly for 42IL. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at 42IL?
42IL sits at 870 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for 42IL?
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.