S40 Prosser

UNKNOWN

Unknown — not enough evidence to call a runway

We don't know, and saying so beats guessing. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available. Wind calm — no directional preference.

certainty: — evidence: NONE no tower now

Wind calm · · 5 min old · from K1S5 (10.1 nm away)

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

26 50% 3452 ft · right traffic

8 50% 3452 ft

Active NOTAMs affecting runways

LIGHTING RWY 26 until 10-15 23:59Z

RWY 26 PAPI U/S

LIGHTING RWY 8 until 10-15 23:59Z

RWY 08 PAPI U/S

Why — evidence behind this answer

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	5 min	Nearest station K1S5 (10.1 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?

S40 field & runways

Prosser, Prosser, Washington. Field elevation 706 ft. Non-towered (NON-ATCT). Magnetic variation 19.0°E on record, 14.1°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 0.114°/year west — about 1° every 9 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
26	270.2°	256.2°	matches	3,452 ft	ASPH	right
8	90.2°	76.2°	matches	3,452 ft	ASPH	left

Generated 08:39:59Z · auto-refreshes · JSON

S40 ☆ Prosser