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Alan B. Janssen Airport (4LL9) Area Aviation Weather & Runway Winds

A current METAR is not available for 4LL9 right now.

Aviation weather near Alan B. Janssen Airport in Morrisonville, IL, decoded from the nearest reporting station (KTAZ): conditions and runway crosswinds.

Alan B. Janssen Airport (4LL9) is a general aviation airport serving pilots in and around Morrisonville, IL at a field elevation of 642 ft. 4LL9 has no weather station of its own. Conditions here are decoded from KTAZ, about 12 nm away, the nearest reporting station, and local conditions can differ. It has 2 physical runways (E, W), the longest 1,980 ft. The nearest TAF is issued for KSPI.

Ask ATIS AIAsk anything about 4LL9's weather, runways or delays, or search another airport.
No data
Awaiting observationlive · refreshes every 60s

No weather station at this airport: showing the nearest station KTAZ, 12.3 nm away.

Wind
-
Visibility
-
Ceiling
Unlimited
Altimeter
-
Temp / Dew
-

Current pilot readout for 4LL9

A current METAR is not available for 4LL9 right now. The nearest reporting station is KTAZ. Check back shortly, review a nearby reporting station, and always confirm with an official briefing before flight.

New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →

Runway wind check

Estimated head/tailwind and crosswind for each runway end from the current reported wind.

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.

RunwayHead / TailCrosswind
E--
W--

Open the crosswind calculator to try your own wind and runway numbers →

4LL9 weather radar

Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.

Loading…
Loading radar…

Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap

NOAA NEXRAD composite and lightning, updated about every five minutes; amber frames are HRRR model guidance, not observed radar. Not for navigation.

Pilot reports (PIREPs) within 100 NM of 4LL9

Reported by pilots in flight over the past 6 hours, via aviationweather.gov.

PIREP0025Z (7:25 PM CDT) · 100 NM NE of 4LL9 · 25,000 ft MSL · E75S
Show raw report
TIP UA /OV RBS090010/TM 0025/FL250/TP E75S/TB NEG
TIP UAHeader: reporting station and UA: a routine pilot report.
OV RBS090010Location: fix or navaid, optionally with a radial and distance in NM.
TM 0025Reported at 00:25 UTC.
FL250Altitude: 25,000 ft MSL.
TP E75SAircraft type reporting.
TB NEGTurbulence: none reported.
PIREP0011Z (7:11 PM CDT) · 98 NM E of 4LL9 · 32,000 ft MSL · B39M
cont light chop turbulence
Show raw report
HUF UA /OV TTH340025/TM 0011/FL320/TP B39M/TB CONT LGT CHOP/RM /ZKC FDC/AF
HUF UAHeader: reporting station and UA: a routine pilot report.
OV TTH340025Location: fix or navaid, optionally with a radial and distance in NM.
TM 0011Reported at 00:11 UTC.
FL320Altitude: 32,000 ft MSL.
TP B39MAircraft type reporting.
TB CONT LGT CHOPTurbulence: cont light chop.
RM /ZKC FDC/AFRemarks.
PIREP0008Z (7:08 PM CDT) · 65 NM NE of 4LL9 · 28,000 ft MSL · A21N
cont light turbulence
Show raw report
MTO UA /OV MTO020020/TM 0008/FL280/TP A21N/TB CONT LGT/RM /ZKC FDC/AF
MTO UAHeader: reporting station and UA: a routine pilot report.
OV MTO020020Location: fix or navaid, optionally with a radial and distance in NM.
TM 0008Reported at 00:08 UTC.
FL280Altitude: 28,000 ft MSL.
TP A21NAircraft type reporting.
TB CONT LGTTurbulence: cont light.
RM /ZKC FDC/AFRemarks.
PIREP2314Z (6:14 PM CDT) · 94 NM NE of 4LL9 · 34,000 ft MSL · A21N
continuous light chop turbulence
Show raw report
TIP UA /OV RBS/TM 2314/FL340/TP A21N/TB CONS LGT CHOP
TIP UAHeader: reporting station and UA: a routine pilot report.
OV RBSLocation: fix or navaid, optionally with a radial and distance in NM.
TM 2314Reported at 23:14 UTC.
FL340Altitude: 34,000 ft MSL.
TP A21NAircraft type reporting.
TB CONS LGT CHOPTurbulence: continuous light chop.
PIREP2311Z (6:11 PM CDT) · 85 NM E of 4LL9 · 18,000 ft MSL · PC12
Show raw report
RSV UA /OV RSV/TM 2311/FL180/TP PC12/SK SKC
RSV UAHeader: reporting station and UA: a routine pilot report.
OV RSVLocation: fix or navaid, optionally with a radial and distance in NM.
TM 2311Reported at 23:11 UTC.
FL180Altitude: 18,000 ft MSL.
TP PC12Aircraft type reporting.
SK SKCSky condition: cloud bases and tops in hundreds of feet MSL.
PIREP2054Z (3:54 PM CDT) · 92 NM E of 4LL9 · 23,000 ft MSL · E75L
continuous light chop turbulence
Show raw report
HUF UA /OV TTH300012/TM 2054/FL230/TP E75L/TB CONS LGT CHOP
HUF UAHeader: reporting station and UA: a routine pilot report.
OV TTH300012Location: fix or navaid, optionally with a radial and distance in NM.
TM 2054Reported at 20:54 UTC.
FL230Altitude: 23,000 ft MSL.
TP E75LAircraft type reporting.
TB CONS LGT CHOPTurbulence: continuous light chop.
PIREP2030Z (3:30 PM CDT) · 52 NM S of 4LL9 · 36,000 ft MSL · UAL1658
Show raw report
ARP UAL1658 3831N 08944W 2030 F360 222/063KT TB SMTH IC
ARP UAL1658 3831N 08944W 203…Header: reporting station and UA: a routine pilot report.
PIREP2026Z (3:26 PM CDT) · 32 NM N of 4LL9 · 20,000 ft MSL · C441
trace rime icing
Show raw report
SPI UA /OV SPI/TM 2026/FL200/TP C441/TA M14/IC TRACE RIME/RM /ZKC FDC/AF
SPI UAHeader: reporting station and UA: a routine pilot report.
OV SPILocation: fix or navaid, optionally with a radial and distance in NM.
TM 2026Reported at 20:26 UTC.
FL200Altitude: 20,000 ft MSL.
TP C441Aircraft type reporting.
TA M14Outside air temperature, °C.
IC TRACE RIMEIcing: trace rime.
RM /ZKC FDC/AFRemarks.

⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.

Recent aviation weather trends at 4LL9

From ATIS Alerts' hourly weather history.

Recent trend data is not available yet for 4LL9. Check back as ATIS Alerts collects more airport weather history.

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Field aerial

North up

Aerial photo of Alan B. Janssen Airport (4LL9)
N ↑

Imagery: USGS The National Map (public domain). Something off? ✏️ Suggest an edit

Airport info

Reference data from the OurAirports dataset.

Type
General aviation airport
FAA LID
4LL9
City
Morrisonville
State
Illinois
Country
United States
Elevation
642 ft
Coordinates
39.3437, -89.4237
Runways
2 physical runways · 2 runway ends
Longest runway
1,980 ft
Weather reporting
Nearest station KTAZ
TAF
Nearest KSPI
Time zone
America/Chicago
Next sunset
21h 34m

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Nearby airports

Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.

VFRMVFRIFRLIFRNo report

RC flying fields nearby

AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.

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Pilot PIREPs for Alan B. Janssen Airport (4LL9)

Community-submitted

Community-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.

Read recent community-submitted pilot notes for Alan B. Janssen 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 4LL9 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.

⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.

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