WxDecoder

WS40 Weather Mercy Hospital Heliport

Janesville, WisconsinElevation 840 ftHeliport
OFF-FIELD REFERENCE
Nearest report: KJVL · 4 NM S · More than 1 hour old
Ceiling 25,000 ft, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KJVL
WIND
190@4
steady
VISIBILITY
10 SM
16.1 km
CEILING
25,000 ft
lowest BKN/OVC
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 190° at 4 kt, visibility 10 SM, temperature 16C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight mostly cloudy, low near 49F, 1% chance of precipitation. Key risks: thunderstorms in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Thursday: Chance Showers And Thunderstorms. Watch for developing convection and plan alternates.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy 49 NW 4 kt – 1%
Monday Mostly Cloudy 60/46 NE 9 kt – 10%
Tuesday Partly Sunny 68/53 SE 9 kt – 6%
Wednesday Mostly Sunny 72/56 S 9 kt – 36%
Thursday Chance Showers And Thunderstorms 72/52 SW 9 kt – 36% Thunderstorms in the forecast
Friday Chance Rain Showers 71/54 SE 4 kt – 37%
Saturday Chance Rain Showers 69/53 S 9 kt – 57%
Sunday Chance Rain Showers 67 SW 4 kt – 35%

Source: National Weather Service (office MKX). Forecast issued 0146Z.

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 WS40. Enter a runway number or heading to estimate wind components.
RUNWAYS

Runway detail & declared distances

1 runway · longest 50 ft

H1
Dimensions
50 x 50 ft
Surface
Asphalt
Edge lights
PERI
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
840 ft MSL

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

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2258Z 5:58 PM
Sunrise
1222Z 7:22 AM
Loggable night
2327Z (6:27 PM local) → 1153Z (6:53 AM local)
end of evening to start of morning civil twilight
Position lights required
2258Z (5:58 PM local) → 1222Z (7:22 AM local)
sunset to sunrise (91.209)
Night passenger currency
2358Z (6:58 PM local) → 1122Z (6:22 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

Mercy Hospital Heliport is in Janesville, Wisconsin. Field elevation 840 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPrivately owned
UsePrivate use
TypeHeliport
ManagerKEN KUBIAK
Manager phone(608) 756-6000
AttendedContinuous (24 hours)
CHARTS & AIRSPACE
ICAO / IATAWS40
SectionalCHICAGO
Center (ARTCC)CHICAGO
Flight service (AFSS)GREEN BAY
RegionWisconsin
CountryUnited States
Coordinates42.6883, -89.0326
Distance from city1 NM N
SERVICES & LIGHTING
Control towerNon-towered
Field lightingSunset to sunrise
BeaconSunset to sunrise · White-green-yellow (heliport)
AIRCRAFT ACTIVITY

WS40 traffic patterns

2026-07-02 to 2026-09-11, 5 days observed · data 2026-10-23

Insufficient confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
0.3
AVG OPS/DAY
1
Activity trend over 3 days: flat, from 1 to 1 operations per dayOperations trend (3 days)

Busiest day: Fri · Busiest month: Sep

FLEET MIX
Helicopter 100%

Mostly rotorcraft.

TOP AIRCRAFT TYPES
›EC45 (Helicopter) · ~2 landings/mo
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

WS40 has no on-field report. Nearest reporting station: KJVL (4 NM S, VFR).

KJVL Southern Wisconsin Regional Airport
4 NM S
VFR
KRFD Chicago Rockford International Airport
30 NM S
VFR
KMSN Dane County Regional Truax Field
30 NM NW
VFR
KFEP Albertus Airport
36 NM SW
VFR
KUES Waukesha County Airport
41 NM NE
VFR
KUNU Dodge County Airport
47 NM N
VFR
AIRPORT REMARKS

Operational remarks

›MEDICAL USE.
›FOR CD CTC CHICAGO ARTCC AT 630-906-8921.
›AND IN-PAVEMENT LGTS.
›PRVDD ALL APCH/DEP OPNS 040-080 DEGS & 220-260 DEGS; TAKEOFF/LDG AREA APPROPRIATELY MKD; NON-OBSTRUCTING WIND INDICATOR MAINTAINED.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗WS40 on OurAirports
FREQUENTLY ASKED
Does WS40 have a METAR?
No on-field METAR is issued for WS40. This page uses the nearest reporting station as a reference.
Does WS40 have a TAF?
No TAF is issued directly for WS40. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at WS40?
WS40 sits at 840 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for WS40?
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.