KCPS Runway 12L/30R — St Louis Downtown Airport
5,301 × 75 ft concrete · true headings 122° / 302° · field elevation 413 ft
Runway 12L/30R at St Louis Downtown Airport (KCPS) in Cahokia/St Louis, IL is 5,301 ft long and 75 ft wide, concrete, with true headings 122° and 302°. Over 2005–2025 the wind gave runway 12L the headwind 53.1% of the time and runway 30R 46.9%, with a crosswind above 15 kt in 0.4% of wind hours. KCPS has no digital ATIS, so the active runway is not known; the wind-favored end and the ATIS Alerts prediction are estimates.
Runway 12L/30R — current operational status
What the D-ATIS, the tower and current NOTAMs state now. The published FAA baseline (NASR) is a separate line in the overview below and does not reflect temporary closures.
- NOTAM 10/034: !CPS 10/034 CPS RWY 12L/30R CLSD 2610261206-2610292130
- NOTAM 10/033: !CPS 10/033 CPS AD AP ARFF INDEX A NOT AVBL AND AP CLSD TO AIR CARRIER OPS 2610252115-2610272115
Sources: Published FAA baseline (OurAirports/NASR record) · FAA NOTAMs. Runway NOTAMs stream live from the FAA NOTAM Management Service (SWIM); the official text is shown verbatim below the card. Always confirm with a current briefing.
NOTAMs for runway 12L/30R
Official text as issued; grouped for reading only. “Scheduled” means not yet in effect. NOTAMs are received live from the FAA NOTAM Management Service through SWIM and recorded since Sep 19, 2026; a NOTAM issued before that and not re-issued since may be missing. Get a full briefing before flight.
- 10/033 · INTL10/25 2115Z (4:15 PM CDT) → 10/27 2115Z (4:15 PM CDT)
!CPS 10/033 CPS AD AP ARFF INDEX A NOT AVBL AND AP CLSD TO AIR CARRIER OPS 2610252115-2610272115
- 10/034 · DOM10/26 1206Z (7:06 AM CDT) → 10/29 2130Z (4:30 PM CDT)
!CPS 10/034 CPS RWY 12L/30R CLSD 2610261206-2610292130
- 09/076 · INTL09/30 1453Z (9:53 AM CDT) → 11/30 2300Z (5:00 PM CST)
!CPS 09/076 CPS TWY A2, A3, A4, TWY A BTN WEST RAMP AND TWY A4, TWY B3 BTN APCH END RWY 12L AND TWY B, TWY B4 BTN RWY 12L/30R AND RWY 12R/30L, TWY C2 BTN WEST RAMP AND APCH END RWY 23 LGT U/S 2609301453-2611302300
- 09/075 · DOM09/30 1452Z (9:52 AM CDT) → 11/30 2300Z (5:00 PM CST)
!CPS 09/075 CPS TWY B BTN TWY B6 AND TWY B7, TWY B6 BTN RWY 12L/30R AND TWY B, TWY B7 BTN APCH END RWY 30L AND TWY B SIGNS LGT U/S 2609301452-2611302300
- 09/074 · INTL09/30 1452Z (9:52 AM CDT) → 11/30 2300Z (5:00 PM CST)
!CPS 09/074 CPS TWY B BTN TWY B6 AND TWY B7, TWY B6 BTN RWY 12L/30R AND TWY B, TWY B7 BTN APCH END RWY 30L AND TWY B LGT U/S 2609301452-2611302300
- 09/073 · DOM09/30 1451Z (9:51 AM CDT) → 11/30 2300Z (5:00 PM CST)
!CPS 09/073 CPS TWY A2, A3, A4, TWY A BTN WEST RAMP AND TWY A4, TWY B3 BTN APCH END RWY 12L AND TWY B, TWY B4 BTN RWY 12L/30R AND RWY 12R/30L, TWY C2 BTN WEST RAMP AND APCH END RWY 23 SIGNS LGT U/S 2609301451-2611302300
- 09/064 · DOM09/29 1200Z (7:00 AM CDT) → 12/31 2359Z (5:59 PM CST)
!CPS 09/064 CPS TWY B7 BTN APCH END RWY 30L AND APCH END RWY 30R CLSD 2609291200-2612312359
- 09/065 · DOM09/29 1200Z (7:00 AM CDT) → 12/31 2359Z (5:59 PM CST)
!CPS 09/065 CPS TWY B6 BTN RWY 12L/30R AND RWY 12R/30L CLSD 2609291200-2612312359
Current runway assignment is not available from D-ATIS at KCPS. The wind components below show which end the wind favors; the section after it is an ATIS Alerts prediction. Neither is an ATC assignment.
Current wind on Runway 12L/30R
Wind variable at 3 kt
No steady wind direction — no components to compute.
No steady wind direction — no components to compute.
- arrivals
- departures
- LAHSO hold-short
- closed
Layout from FAA NASR runway-end coordinates; the selected runway is highlighted and no active source exists here. Not for navigation. Official FAA diagram ↗
Components use TRUE runway headings and TRUE METAR wind. “Favored by wind” is arithmetic, not an ATC assignment.
Runway 12L/30R outlook
Where runway 12L/30R stands now and which runway at KCPS is likely over the next 12 hours — an estimate, not an ATC assignment.
Time · runway 12L/30R · airport-wide outlook · confidence · forecast wind · why
- Now1807Z · 1:07 PM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 3 kt·Why METAR wind variable at 3 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
- +1 h1907Z · 2:07 PM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 4 kt·Why TAF wind variable at 4 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
- +2 h2007Z · 3:07 PM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 4 kt·Why TAF wind variable at 4 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
- +3 h2107Z · 4:07 PM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 4 kt·Why TAF wind variable at 4 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
- +6 h0007Z · 7:07 PM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 4 kt·Why TAF wind variable at 4 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
- +12 h0607Z · 1:07 AM CDT·12L/30R: CLOSED·no runway favored airport-wide·no confidence·wind VRB at 4 kt·Why TAF wind variable at 4 kt: no steady direction, so wind does not decide the runway.|No recorded calm-wind preference yet, so no end is favored.|Runways 12L and 30R are excluded: stated closed.
ATIS Alerts Predicted Runway is an estimate from the TAF wind forecast, runway geometry (most headwind, crosswind penalised, tailwind over 5 kt avoided, longest runway breaks ties), the current stated configuration and any stated closures. Each row lists its reasons; “no runway favored” is a genuine answer under variable or light wind, never replaced by a guess. It is not an ATC assignment and does not know about noise abatement or traffic flow unless the recorded history shows them. TAF issued 1720Z (12:20 PM CDT).
Runway 12L/30R equipment and lighting
What the FAA record lists for each end, annotated with current NOTAM and D-ATIS outages.
- Approach lighting
- Not available
- Visual glide slope
- Not available
- Runway edge lighting
- MIRL (medium intensity)
- Centerline lighting
- Not available
- Touchdown zone lighting
- Not available
- REIL
- Available
- ILS
- Not available
- Localizer
- Not available
- Glideslope
- Not available
- DME
- Not available
- Marker beacons
- Not available
- RVR
- Not available
- Runway markings
- Non-precision instrument
- Arresting system
- Not available
- Approach lighting
- Not available
- Visual glide slope
- Not available
- Runway edge lighting
- MIRL (medium intensity)
- Centerline lighting
- Not available
- Touchdown zone lighting
- Not available
- REIL
- Available
- ILS
- Not available
- Localizer
- Not available
- Glideslope
- Not available
- DME
- Not available
- Marker beacons
- Not available
- RVR
- Not available
- Runway markings
- Non-precision instrument
- Arresting system
- Not available
Source: FAA NASR 28-day subscription, cycle effective 2026-10-01 (equipment on record) · FAA NOTAMs via SWIM (live)and the current D-ATIS (outages). “Not available” means the FAA record lists no such equipment for the end; nothing here is inferred. An outage annotation is only ever a reading of the official text shown with it. Declared distances are not shown in this phase.
Land and hold short operations
LAHSO hold-short points and available landing distances on the FAA record, and whether the current D-ATIS reports LAHSO in effect.
No LAHSO hold-short point on the FAA record for this end.
No LAHSO hold-short point on the FAA record for this end.
This airport has no D-ATIS, so the current LAHSO state is not known here. Source: FAA NASR cycle 2026-10-01; D-ATIS text read by ATIS Alerts.
Frequencies for runway 12L/30R
Tower, ground, clearance, ATIS and approach frequencies from the FAA record, labelled by what they apply to.
| Service | Frequency | Applies to |
|---|---|---|
| Tower | 119.925 | Airport-wide |
| Tower | 379.3 | Airport-wide |
| Ground | 121.8 | Airport-wide |
| Clearance delivery | 118.275 | Airport-wide |
| Clearance delivery | 121.8 | Sector: WHEN TWR CLSD |
| ATIS | 121.45 | Airport-wide |
Show all frequencies (4 more: approach and departure sectors, secondary and other)
| Service | Frequency | Applies to |
|---|---|---|
| CTAF | 119.925 | Airport-wideACTVT MALSR RWY 30L WHEN ATCT CLSD; REIL RWY 30R - CTAF. HIRL RWY 12R/30L PRESET MED INTST WHEN ATCT CLSD. MIRL RWY 12L & 30R NOT AVBL WHEN ATCT CLSD. PAPI RWY 12R & 30L OPR CONSLY. |
| UNICOM | 122.95 | Airport-wide |
| Approach / departure | 123.7 | Airport-wide |
| Approach / departure | 371.875 | Airport-wide |
The FAA record does not sectorize KCPS's frequencies by runway; every row applies airport-wide. Source: FAA NASR FRQ, cycle 2026-10-01. Verify on the current chart supplement before use.
Runway 12L/30R overview
Physical characteristics from the FAA-derived runway record.
- Length
- 5,301 ft
- Width
- 75 ft
- Surface
- Concrete · Fair condition
- Weight bearing (lb)
- S 30k · D 30k
- PCN
- 10
- Runway lights
- Lighted
- Airport elevation
- 413 ft
- Published FAA baseline
- Open
- Published NASR record; does not reflect temporary closures or restrictions. Current operational status is the card at the top of the page.
- True heading
- 122°
- Magnetic
- 122°
- Published FAA baseline
- Open
- Threshold elevation
- 410 ft
- TDZ elevation
- 410 ft
- Displaced threshold
- None on record
- Controlling obstruction
- tree, 96 ft, 3,817 ft from threshold, 37:1 slope
- True heading
- 302°
- Magnetic
- 302°
- Published FAA baseline
- Open
- Threshold elevation
- 407 ft
- TDZ elevation
- 408 ft
- Displaced threshold
- None on record
- Traffic pattern
- Right
- Controlling obstruction
- tree, 72 ft, 2,664 ft from threshold, 34:1 slope
Runway 12L/30R numbers are magnetic; the stored geometry and every wind calculation on this page are TRUE north, so they never need a variation correction. Magnetic headings use the FAA's published variation for this airport, 0.0°E (2000), the same value printed on the FAA airport diagram. Surface condition, treatment, weight bearing, thresholds and traffic pattern are from the FAA NASR record (cycle 2026-10-01); lighting, ILS and LAHSO are in their own sections above. Declared distances are not shown in this phase.
Wind-favored runway at KCPS — last 30 days
Which runway end had the most headwind each hour, from ATIS Alerts' collected wind history — an estimate, not ATC use.
Share of hours each runway had the most headwind. From wind reports, not ATC assignments.
- 12L/12R
- 27%
- 30L/30R
- 25%
- 05
- 24%
- 23
- 24%
Historical wind and crosswind on runway 12L/30R
20-year hourly climatology from the ASOS archive, computed per runway end.
From 169,656 hourly observations at KCPS (2005–2025), 130,388 with a steady wind direction (23.1% calm, variable or direction-less). One observation per clock hour; TRUE headings against TRUE wind.
Crosswind on runway 12L/30R (either end)
| Crosswind (kt) | Share of wind hours |
|---|---|
| 0–5 | 67.2% |
| 5–10 | 28.1% |
| 10–15 | 4.4% |
| 15–20 | 0.4% |
| 20–25 | 0% |
| 25+ | 0% |
Strongest-crosswind month on average: Mar; calmest: Aug. Percentiles are streaming approximations (t-digest), accurate to about 0.1 kt.
Runway 12L
Runway 30R
“Most wind-favored end” is meteorological analysis: the share of steady-wind hours (2005–2025) in which this end had the most headwind of every open runway end at KCPS. It does not mean ATC selected the runway that often (parallel ends with the same heading share the credit equally). Observed runway use, where available, is the configuration-history section above.
By wind direction
| Wind from | Share of wind hours | 12L favored | 30R favored | Mean crosswind | Crosswind > 15 kt |
|---|---|---|---|---|---|
| N 338–023° | 15% | 0% | 36.2% | 6.7 kt | 1.2% |
| NE 023–068° | 7% | 0% | 0% | 6.1 kt | 0.7% |
| E 068–113° | 7% | 30.3% | 0% | 3.1 kt | 0% |
| SE 113–158° | 16% | 50.9% | 0% | 2 kt | 0% |
| S 158–203° | 23% | 35.3% | 0% | 5 kt | 0.4% |
| SW 203–248° | 8% | 0% | 0% | 5.6 kt | 0.6% |
| W 248–293° | 12% | 0% | 28.8% | 3.8 kt | 0.2% |
| NW 293–338° | 13% | 0% | 53.9% | 2.4 kt | 0% |
By time of day (airport-local)
Seasonal runway conditions
| Month | Mean crosswind (kt) |
|---|---|
| Jan | 4.2 kt |
| Feb | 4.8 kt |
| Mar | 5.0 kt |
| Apr | 4.7 kt |
| May | 4.3 kt |
| Jun | 4.3 kt |
| Jul | 3.9 kt |
| Aug | 3.7 kt |
| Sep | 3.9 kt |
| Oct | 4.3 kt |
| Nov | 4.2 kt |
| Dec | 4.1 kt |
| Month | Prevailing | Mean wind | Gusty | Mean xw | xw > 10 | xw > 15 | xw > 20 | 12L tail > 5 | 30R tail > 5 | IFR | TS | Fog |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | NW | 7.2 kt | 14.4% | 4.2 kt | 3.8% | 0.3% | 0% | 35.7% | 16.4% | 10.8% | 0.12% | 11.8% |
| Feb | N | 7.4 kt | 13.9% | 4.8 kt | 7.3% | 0.7% | 0% | 34.4% | 17.1% | 8.5% | 0.22% | 10.2% |
| Mar | S | 7.6 kt | 18.1% | 5 kt | 9.5% | 1.1% | 0.2% | 27.3% | 25.7% | 5.8% | 0.72% | 9.1% |
| Apr | S | 7.3 kt | 21.7% | 4.7 kt | 7.7% | 0.7% | 0.1% | 26.5% | 26.1% | 4.1% | 1.71% | 6.3% |
| May | S | 5.7 kt | 13.1% | 4.3 kt | 4.2% | 0.2% | 0% | 18.5% | 21.5% | 4% | 1.8% | 6.5% |
| Jun | S | 4.9 kt | 10.1% | 4.3 kt | 3.3% | 0.2% | 0% | 15.9% | 13.4% | 1.9% | 2.27% | 3.9% |
| Jul | S | 4.2 kt | 4.3% | 3.9 kt | 1.8% | 0.2% | 0% | 11.6% | 11.9% | 3.2% | 2.07% | 5.8% |
| Aug | S | 4 kt | 3.9% | 3.7 kt | 1.5% | 0.1% | 0% | 11.2% | 12.6% | 2.9% | 1.49% | 7.1% |
| Sep | S | 4.1 kt | 6.1% | 3.9 kt | 3.4% | 0.2% | 0% | 16.6% | 11.7% | 5.1% | 0.89% | 9.2% |
| Oct | S | 5.5 kt | 12.4% | 4.3 kt | 4.1% | 0.2% | 0% | 26.1% | 15% | 5.6% | 0.54% | 7% |
| Nov | S | 6.3 kt | 13.1% | 4.2 kt | 4.7% | 0.3% | 0% | 26.6% | 19.5% | 6.8% | 0.17% | 9.7% |
| Dec | S | 6.6 kt | 12.7% | 4.1 kt | 3.9% | 0.2% | 0% | 29.5% | 18% | 9.3% | 0.18% | 12.2% |
IFR, thunderstorm (TS) and fog columns are airport-wide shares of hours; the crosswind and tailwind columns are specific to this runway. Prevailing = most common 45° wind sector among wind hours.
Runway 12L/30R closure history
Kept per source with its provenance: D-ATIS-observed, NOTAM-observed and the FAA published baseline are never merged.
KCPS has no D-ATIS, so there is no broadcast-observed closure record.
- 10/034 · closure (full) · runway 12L/30Reffective 2026-10-26 12:06Z → 2026-10-29 21:30Z · first seen 2026-10-26 12:07Z · last seen 2026-10-26 12:08Z
!CPS 10/034 CPS RWY 12L/30R CLSD 2610261206-2610292130
- 10/033 · airport closure (full) · runway airport-wideeffective 2026-10-25 21:15Z → 2026-10-27 21:15Z · first seen 2026-10-25 15:54Z · last seen 2026-10-25 15:54Z
!CPS 10/033 CPS AD AP ARFF INDEX A NOT AVBL AND AP CLSD TO AIR CARRIER OPS 2610252115-2610272115
- 10/032 · airport closure (full) · runway airport-wideeffective 2026-10-25 15:45Z → 2026-10-25 19:00Z · first seen 2026-10-25 15:53Z · last seen 2026-10-25 15:54Z
!CPS 10/032 CPS AD AP ARFF INDEX A NOT AVBL AND AP CLSD TO AIR CARRIER OPS 2610251545-2610251900
- 10/031 · airport closure (full) · runway airport-wideeffective 2026-10-25 13:56Z → 2026-10-28 23:00Z · first seen 2026-10-25 14:01Z · last seen 2026-10-25 15:45Z · cancelled 2026-10-25 15:45Z
!CPS 10/031 CPS AD AP ARFF INDEX A NOT AVBL AND AP CLSD TO AIR CARRIER OPS 2610251356-2610282300
Runway 12L/30R: Open on the published record — a baseline that does not reflect temporary closures or restrictions, not the current operational status.
Recent pilot reports involving runway 12L/30R
Official PIREPs that name this runway explicitly, past 6 hours.
No pilot report in the last 6 hours names runway 12L/30R at KCPS explicitly. Reports near the airport that do not name a runway are on the airport page.
Instrument approaches to runway 12L/30R
From the FAA d-TPP, linked to the official plates.
Runway 12L
No straight-in instrument approach published to this end.
Runway 30R
- RNAV (GPS)RNAV (GPS) RWY 30R ↗
7 departure procedures · 4 STARs · FAA d-TPP cycle 2611. Plates open on aeronav.faa.gov (public domain); ATIS Alerts does not reproduce charts or minimums.
Methodology and sources
Short version below; the full write-up is at Runway Intelligence methodology, and every launched airport is listed on the Runway Intelligence hub.
- Active runwayscome first from the tower's TFDM (Terminal Flight Data Manager) airport configuration, received as structured data through the FAA SWIM Cloud Distribution Service at towers that have it; otherwise from the airport's D-ATIS text (community relay of the FAA broadcast) with an open, tested parser, and the broadcast text is always shown. Every change is recorded, so “recorded use” is what the facility stated, never an inference. ATIS Alerts is not an FAA product and this is not FAA data; SWIM content is for non-operational use.
- Flowis the compass direction of the stated arrival ends (eight sectors, named only when every arrival end points within 30° of the others and clear of a sector edge); a tower's own configuration name is used when it carries a direction word. Stored separately from the runway sets.
- Equipment, LAHSO and frequencies come from the FAA NASR 28-day subscription (cycle 2026-10-01): approach lights, visual glide slope, edge / centerline / touchdown-zone lights, REIL, ILS components with FAA status, RVR, markings, LAHSO hold-short points and available landing distances, and facility frequencies with their published sectorization. Outage annotations are readings of the NOTAM or D-ATIS text shown beside them. Blank FAA fields read “Not available”.
- Wind components use the current METAR (aviationweather.gov) against TRUE runway headings from the OurAirports/FAA runway record.
- Runway visual range, tower demand and traffic-management restrictions come from FAA SWIM: STDDS Airport Data (RVR and light settings, about 130 airports) and TFDM (15-minute runway demand, APREQ/MIT restrictions). Each block is stamped with its own time; none of it is an FAA product or a clearance.
- Predicted runway scores each open end from the TAF wind (headwind, crosswind penalty, tailwind avoidance, longest-runway tie-break), excludes stated closures, and — once a wind sector has 24 h of recorded use — adjusts confidence by what the facility did under similar wind; every row lists its reasons. It does not model noise abatement or flow programs beyond what the record shows.
- History thresholds: usage shares need 12 / 48 / 168 recorded hours for the 24-hour / 7-day / 30-day windows; a wind sector needs 24 h and 5 days; time-of-day needs 7 days and 20 h per daypart; flow shares need 48 h. Below a bar the module says so instead of showing a percentage.
- Climatology: Iowa Environmental Mesonet ASOS archive, one observation per hour, 45° wind sectors, percentiles via t-digest; runway geometry is today's record applied to all years. Methodology v1.
- PIREPs: official reports from aviationweather.gov are attached only when the text names this runway and the report is tied to KCPS by identifier or by position within 15 NM. Approaches: FAA d-TPP metafile, current charting cycle; plates link to aeronav.faa.gov. No minimums are reproduced.
- Data freshness: METAR and D-ATIS refresh every minute on this page; the D-ATIS recorder ran 2 min ago; usage rollups every 3 h; climatology through 2025-12-31.
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KCPS airport diagram
Official FAA taxiway and runway layout. Tap to zoom.
Official FAA airport diagram · d-TPP cycle 2611 · Not for navigation. Download the official FAA PDF ↗
⚠️ ATIS Alerts provides informational runway analysis based on available weather, the tower's TFDM configuration and NOTAMs received through FAA SWIM, D-ATIS text, FAA data and historical observations. Active runways shown here are what the tower or its D-ATIS stated and may lag or be misread; NOTAM coverage is not complete; predicted runways are an ATIS Alerts estimate, not an ATC assignment; equipment states are readings of the official text shown with them. Not an FAA product. Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.