A pale moonbow arcing through mist below Cumberland Falls at night

Cumberland Falls Moonbow LiveFriday, September 25

MARGINAL

5 live/model sources fresh

Estimated Moonbow Chance70%

Physical score 80/100

Best window: 8:30 PM – 10:50 PM
Arrive by: 8:05 PM
Forecast confidence: MODERATE 49/100

A viable window exists, but one or more ingredients remain marginal.

The Moon is 99% illuminated.
3 forecast models put cloud cover near 17% with 8-point spread.
Low mist proxy from 183 CFS (11th seasonal percentile).
The Moon clears the effective terrain and tree skyline. Peak physical score is 80.

USGS 3DEP cached horizonnot live

USGS station 03404500updated 16 min ago

NWS forecast grid JKL 28,14updated 185 min ago

NOAA HRRR 3 km via Open-Meteoupdated now

Peak 10:00 PM · Physical score 80 · 140 min sustained window

Photo: Design219 / Wikimedia Commons · CC BY-SA 4.0

Interactive moonbow diorama

See why this time works

Scrub the evening, then tap a feature to understand the geometry.

Viewing time10:00 PM

Geometry is workingPhysical score 80/100

Moonbow zone

A primary moonbow appears roughly 40–42° from the anti-lunar point. The brighter this arc appears here, the better the modeled bow-to-mist alignment.

Explore the night5:00 PM → 6:00 AM

Moon altitude34.4°

Bow/mist error0.0°

Mist placement66/100

Cloud transmission74/100

Physical score80/100

This is an explanatory diorama, not a literal camera view. The engine itself uses topocentric Moon position, the 40–42° primary-bow geometry, the cached local skyline and a modeled mist volume at five-minute resolution.

Five-minute engine

Tonight timeline

The Moon clears the effective terrain and tree skyline. The Moon climbs above viable primary-bow geometry.

Checking the six conditions…

See why this time works

Tonight timeline

Moon + geometry

Moonlight path

River + mist

Why tonight

Falls Overlook

Forecast confidence

Next moonbow windows

Did you see the moonbow?