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CloudTops reliability

Every claim the inference engine makes is checked against pilot reports. This page keeps the receipts: fixed benchmark routes, run daily.

50%

PIREP corroboration rate

evaluable segments

segments analyzed

days tracked

Does the inference hold up? outcome of every route segment vs. pilot reports

Data table

Day (UTC)	Segments	Corroborated	PIREP override	PIREP only	No PIREP tops	Rate
2026-07-30	12	1	1	1	9	50%

Latest benchmark reports KFCM-KORD, KALB-KPWM, KPVD-KAUG

KALB-KPWM Albany/Albany Intl → Portland/Portland Intl Jetport, 162 NM · 2026-07-30T18:00:41+00:00

reported (PIREP) Segment 1 · 0–81 NM 2 IFR · 1 VFR · 0 unk

One VFR aircraft level at 7,976 ft MSL above the lowest ceiling (BKN/OVC) base (2,081-7,969 ft MSL across stations) — weak single-sample hint that tops are below 6,976 ft MSL. (Higher-layer tops reported by PIREP at 24,000 ft MSL — separate layer, not the low deck.) CONFLICT: PIREP reports tops at 8,700 ft MSL, above the traffic-derived bound of 6,976 ft — trust the PIREP; bound raised accordingly.

none Segment 2 · 81–182 NM 3 IFR · 2 VFR · 5 unk

VFR traffic only below the lowest ceiling (BKN/OVC) base (3,112-11,230 ft MSL across stations); 1 aircraft underneath, nobody established on top — layer may be solid, tall, or tops out of practical reach. No top estimate.

KFCM-KORD Minneapolis/Flying Cloud → Chicago/Chicago O'Hare Intl, 296 NM · 2026-07-30T18:00:03+00:00

low Segment 1 · 0–99 NM 15 IFR · 9 VFR · 2 unk

One VFR aircraft level at 7,042 ft MSL above the lowest ceiling (BKN/OVC) base (3,932-25,837 ft MSL across stations) — weak single-sample hint that tops are below 6,042 ft MSL.

none Segment 2 · 99–198 NM 0 IFR · 5 VFR · 2 unk

VFR traffic only below the lowest layer (FEW/SCT) base (6,912-37,830 ft MSL across stations); 4 aircraft underneath, nobody established on top — layer may be solid, tall, or tops out of practical reach. No top estimate.

n/a (high layer) Segment 3 · 198–316 NM 23 IFR · 23 VFR · 2 unk

Lowest reported ceiling (BKN/OVC) base is 25,663-25,860 ft MSL across stations — well above the GA band; clouds are not a factor on this corridor. VFR altitude spread reflects preference, not cloud avoidance.