WxDecoder

KALN/ALN METAR St Louis Regional Airport

Alton/St Louis, IllinoisElevation 544 ftMedium airport
CURRENT STATUS
VFR4 min old
No ceiling, visibility 10 SM.
FLIGHT CATEGORY
VFR
ceiling & visibility
WIND
Calm
no steady wind
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
DENSITY ALT
133 ft
-411 ft vs field
CURRENT METAR

Decoded observation

Observed 0150Z (8:50 PM local) · 4 min old

KALN is currently VFR. Winds are calm. Visibility is 10 statute miles. There is no ceiling.

WIND
Calm
No steady wind.
VISIBILITY
10 statute miles
16.1 km, good.
CEILING & SKY
CLR
FEW and SCT layers are not ceilings.
TEMP / DEWPOINT
14°C / 11°C
57°F / 52°F. 3°C spread.
ALTIMETER
30.34 inHg
1027.4 hPa, above standard.
WEATHER & HAZARDS
No significant hazards
No precipitation or obscuration reported.

Codes in this report: CLR

Hover or tap any group for a plain-English explanation.

FAA: no delays reported at ALN.

Source: FAA System Operations (ASWS). Operational status only; verify with official FAA sources and NOTAMs.

SUGGESTED RISK · TRAINING USE

Suggested risk level: Low

›No TAF available for this airport.

A suggested risk level for training and situational awareness only, not a go/no-go authority. Verify with official sources and apply your personal minimums.

FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

Current aviation conditions show flight category VFR, wind calm, visibility 10 SM, ceiling none. Forecast suggests tonight mostly cloudy, low near 50F, 1% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

DayConditionsTemp FWindGustsPrecipPilot note
Tonight Mostly Cloudy 50 SE 2 kt – 1%
Monday Partly Sunny 76/49 S 5 kt – 2%
Tuesday Mostly Cloudy 75/51 S 8 kt – 0%
Wednesday Sunny 79/53 S 9 kt – 0%
Thursday Sunny 84/55 S 7 kt – 3%
Friday Mostly Sunny 82/56 S 7 kt – 11%
Saturday Chance Rain Showers 75/57 S 8 kt – 70%
Sunday Chance Rain Showers 76 SW 8 kt – 30%

Source: National Weather Service (office LSX). Forecast issued 0153Z.

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
2 runways · crosswind ranking
NESW11291735CALMCALMCALMCALMCALM
WIND USED
Wind calm or variable
Crosswind ranking is unavailable until the wind has a steady direction.
Components are estimates from the current METAR wind and runway heading. Verify with the Chart Supplement and NOTAMs.
RUNWAYS

Runway detail & declared distances

2 runways · longest 8,099 ft

11/29
Dimensions
8,099 x 150 ft
Surface
Asphalt (good)
Edge lights
HIGH
RWY 11113°T
Landing length (LDA)8,099 ft
TORA / TODA / ASDA8,099 / 8,099 / 8,099 ft
REILYes
VGSIPAPI (P4R)
Traffic patternLeft
RWY 29293°T
Landing length (LDA)8,099 ft
TORA / TODA / ASDA8,099 / 8,099 / 8,099 ft
ILSILS/DME
Approach lightsMALSR
Traffic patternLeft
17/35
Dimensions
6,500 x 100 ft
Surface
Asphalt (good)
Edge lights
MED
RWY 17173°T
VGSIPAPI (P4L)
Traffic patternLeft
RWY 35353°T
VGSIPAPI (P4L)
Traffic patternLeft

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Performance & density altitude

Density altitude
133 ft
Pressure altitude
124 ft
Field elevation
544 ft MSL
Temperature
14°C (57°F)
Dewpoint
11°C (52°F)
Altimeter
30.34 inHg

Density altitude estimates how the aircraft performs versus standard atmosphere. Higher density altitude reduces climb performance and increases takeoff distance.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
2308Z 6:08 PM
Sunrise
1220Z 7:20 AM
Loggable night
2335Z (6:35 PM local) → 1153Z (6:53 AM local)
end of evening to start of morning civil twilight
Position lights required
2308Z (6:08 PM local) → 1220Z (7:20 AM local)
sunset to sunrise (91.209)
Night passenger currency
0008Z (7:08 PM local) → 1120Z (6:20 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

St Louis Regional Airport is in Alton/St Louis, Illinois. Field elevation 544 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPublicly owned
UseOpen to the public
TypeMedium airport
ManagerDANIEL ADAMS, AAE
Manager phone618-259-2531
AttendedDaily, 0700–2200
CHARTS & AIRSPACE
ICAO / IATAKALN / ALN
SectionalST LOUIS
Center (ARTCC)KANSAS CITY
Flight service (AFSS)SAINT LOUIS
RegionIllinois
CountryUnited States
Coordinates38.8903, -90.0460
Distance from city4 NM E
SERVICES & LIGHTING
Fuel100LL · Jet A
Control towerTowered
Field lightingSee remarks
BeaconSunset to sunrise · White-green (lighted land airport)
CTAF126.000
UNICOM122.950
FREQUENCIES

Communications

124.2
APP/DEP
A/D
128
ATIS
ATIS
128
AWOS 3
AWOS
120.2
CLNC DEL
CLD
126
CTAF
CTAF
120.2
GND
GND
122.05
RDO
RDO
126
REGIONAL TWR
TWR
122.95
UNICOM
UNIC
122.950
UNICOM
UNICOM

Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.

AIRCRAFT ACTIVITY

KALN traffic patterns

2026-06-12 to 2026-10-23, 60 days observed · data 2026-10-23

High confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
9.7
AVG OPS/DAY
19.1
Activity trend over 18 days: rising, from 12 to 16 operations per dayOperations trend (18 days)

Busiest day: Mon · Busiest month: Oct

FLEET MIX
Piston single 49%Jet 24%Unknown 19%Helicopter 4%Twin 2%Turboprop 2%Airliner 1%

Mostly small piston aircraft.

TOP AIRCRAFT TYPES
›C172 (Piston single) · ~22 landings/mo
›P28A (Piston single) · ~11 landings/mo
›DV20 (Unknown) · ~5 landings/mo
›ST75 (Piston single) · ~5 landings/mo
›RV12 (Unknown) · ~4 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly single-engine piston aircraft.

›C172 (Piston single)
›RV12 (Unknown)
›P28A (Piston single)
›DV20 (Unknown)
›FDCT (Unknown)

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

Current flight category at nearby reporting stations.

KSTL St. Louis Lambert International Airport
17 NM SW
VFR
KCPS St Louis Downtown Airport
20 NM S
VFR
KBLV Scott AFB/Midamerica Airport
23 NM SE
VFR
KSUS Spirit of St Louis Airport
32 NM SW
VFR
KSAR Sparta Community Airport - Hunter Field
47 NM S
VFR
KENL Centralia Municipal Airport
50 NM SE
VFR
AIRPORT REMARKS

Operational remarks

›INDEX B FFR EQUIP AVBL WITH 30-MIN PPR.
›WILDLIFE ON AND IN VICINITY OF AIRPORT
›MIGRATORY BIRD ACTIVITY IN VICINITY OF ARPT SEPTEMBER THROUGH APRIL.
›PCR VALUE: 440/F/D/X/T
›ATTENDANT AFT HR - CALL 618-259-3230 OR 258-1005.
›ACTVT MALSR RWY 29; REIL RWY 11 - CTAF. WHEN ATCT CLSD PAPI 11, 17, 35; HIRL RWY 11/29; MIRL RWY 17/35 PRESET ON LOW INTST, TO INCR INTST & ACTVT - CTAF.
›RWY 17/35 NOT AVBL FOR PART 121/PART 380 OPS WITH SKED PAX CARRYING OPS MORE THAN 9 PAX SEATS AND NON-SKED PAX CARRYING OPS MORE THAN 30 PAX SEATS. 90 DAY PPR FOR UNSKED ACR OPS GTR THAN 30 PAX SEATS - CALL AMGR.
›PCR VALUE: 180/F/D/X/T
›RWY 11/29 NOT AVBL FOR PART 121/PART 380 OPS WITH SKED PAX CARRYING OPS MORE THAN 9 PAX SEATS AND NON-SKED PAX CARRYING OPS MORE THAN 30 PAX SEATS. 90 DAY PPR FOR UNSKED ACR OPS GTR THAN 30 PAX SEATS - CALL AMGR.
›RWY 11 & 17 APCH ENDS CLOSELY ALIGNED; VERIFY CORRECT COMPASS HDG PRIOR TO DEP.
OFFICIAL LINKS & SOURCES
↗Official METAR on AviationWeather.gov
↗Search NOTAMs (official FAA NOTAM Search)
↗Wikipedia
↗KALN on OurAirports
FREQUENTLY ASKED
Does KALN have a METAR?
Yes. KALN has a current METAR observation, decoded into plain English on this page.
Does KALN have a TAF?
When KALN issues a TAF, its decoded forecast timeline loads live on this page; otherwise use the nearest TAF-issuing field as a planning reference.
What is the field elevation at KALN?
KALN sits at 544 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for KALN?
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.