KRYY Cobb County Intl/Mccollum Fld

PROBABLE 68%

Runway 9 — local convention slightly favors it

No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. ADS-B tracking just started here — traffic history is still building. Weather observation is 7583 minutes old — treat with caution. Wind calm — no directional preference.

certainty: 68% evidence: NONE Class D

Wind calm · VFR · 7583 min old

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

9 62% 6295 ft · right traffic · calm-wind rwy

27 38% 6295 ft

Active NOTAMs affecting runways

APCH OTS RWY 27 until 05-20 16:52Z

IAP COBB COUNTY INTL/MCCOLLUM FLD, ATLANTA, GA.
ILS OR LOC  RWY 27, AMDT 6...
PROCEDURE NA EXCEPT FOR ACFT EQUIPPED WITH SUITABLE RNAV SYSTEM WITH GPS,
RMG VOR OUT OF SERVICE. 2610081652-2705201652EST

LIGHTING RWY 9 until 10-29 23:59Z

RWY 09 PAPI U/S

Why — evidence behind this answer

Runway 9

PRIOR 9 is the designated calm-wind runway +0.50

Runway 27

PRIOR 27 used 100% of the time in this wind bin (n=1) +0.03

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	7583 min
ADSB	WARMING_UP	3477 min	Only 0 min of track history so far
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (Only 0 min of track history so far)

Was this right?

KRYY field & runways

Cobb County Intl/Mccollum Fld, Atlanta, Georgia. Field elevation 1040 ft. Class D airspace. Towered. Magnetic variation 4.0°W on record, 5.5°W 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 0.057°/year west — about 1° every 18 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
27	268.8°	274.3°	matches rule gives runway 28 in ~13 yr	6,295 ft	CONC	left	ILS
9	88.8°	94.3°	matches rule gives runway 10 in ~13 yr	6,295 ft	CONC	right	calm-wind RY 9 IS CALM WIND RY IN VFR CONDS.

What KRYY usually does

Of 20 operations this service has observed at KRYY since 2026-08-27:

27 70% 14 ops
9 30% 6 ops

Observed by this service only — not an FAA statistic, and biased toward the hours and days it has been watching. It is shown because it is the same history the engine learns its local-convention prior from.

Generated 09:13:28Z · auto-refreshes · JSON

KRYY ☆ Cobb County Intl/Mccollum Fld