A pale moonbow arcing through mist below Cumberland Falls at night

Cumberland Falls Moonbow LiveMonday, July 27

TOO EARLY TO CALL

5 live/model sources fresh

Estimated Moonbow Chance60%

Physical score 73/100

Best window: 10:00 PM – 10:35 PM
Arrive by: 9:35 PM
Forecast confidence: LOW 38/100

The astronomy can be planned now, but reliable weather inputs are not available yet.

The Moon is 97% illuminated.
4 forecast models put cloud cover near 31% with 41-point spread.
Low mist proxy from 183 CFS (11th seasonal percentile).
Nautical twilight ends and the sky becomes dark enough. Peak physical score is 73.

USGS 3DEP cached horizonnot live

USGS station 03404500updated 69 min ago

NWS forecast grid JKL 28,14updated 68 min ago

NOAA HRRR 3 km via Open-Meteoupdated now

Peak 10:00 PM · Physical score 78 · 35 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 78/100

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 altitude16.9°

Bow/mist error0.1°

Mist placement100/100

Cloud transmission61/100

Physical score78/100

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

Nautical twilight ends and the sky becomes dark enough. The sustained score falls out of its strongest period.

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?