5V4 Calhan

WIND_INFERRED 80%

Runway 35 — favored by the wind (6 kt at 50° true)

Based on wind only — no traffic or ATIS to confirm. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available.

certainty: 80% evidence: NONE no tower now

Wind 050° true at 6 kt · VFR · 20 min old · from KAFF (24.8 nm away)

▶ Listen live — ATIS/CTAF on LiveATC opens LiveATC’s own player · verify the broadcast yourself

35 86% 4565 ft · 4 kt head, 5 kt x-right · right traffic

17 14% 4565 ft · 4 kt TAIL, 5 kt x-left

Why — evidence behind this answer

Runway 35

WIND 4 kt headwind, 5 kt right crosswind 20 min ago +0.34

Runway 17

WIND 4 kt TAILWIND, 5 kt left crosswind 20 min ago -1.46

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	20 min	Nearest station KAFF (24.8 nm away)
ADSB	UNAVAILABLE		No ADS-B track history here yet
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

Was this right?

5V4 field & runways

Calhan, Calhan, Colorado. Field elevation 6450 ft. Non-towered (NON-ATCT). Magnetic variation 11.0°E on record, 7.1°E today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.079°/year west — about 1° every 13 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against *today's* declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
Runway	True	Magnetic	Number	Length	Surface	Pattern	Notes
17	180.5°	173.4°	matches rule gives runway 18 in ~20 yr	4,565 ft	TURF-GRVL	left
35	0.5°	353.4°	matches rule gives runway 36 in ~20 yr	4,565 ft	TURF-GRVL	right

Generated 11:15:09Z · auto-refreshes · JSON

5V4 ☆ Calhan