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Great Basin National Park

38.983° N   114.300° W  ·  2080 M
59 /100
PEAK
Worth setting up — 6 hours of workable sky from 23:00.
BEST WINDOW 23:00–05:00 · ASTRO DARK 22:00–05:00 · MOON 1%
Transparency
0.49
Seeing
1.00
Cloud
27%
Moon
1%

Good tonight

Hour by hour, local to Great Basin National Park. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
0
23
32
40
38
35
51
59
57
14
0
BEST WINDOW
Low cloud
2%
0%
1%
1%
8%
0%
0%
0%
5%
3%
2%
Mid cloud
12%
19%
13%
26%
20%
10%
13%
13%
9%
11%
13%
High cloud
76%
98%
98%
63%
64%
94%
47%
20%
20%
44%
84%
Transparency
0.60
0.47
0.46
0.49
0.48
0.49
0.47
0.40
0.36
0.35
0.36
Seeing
1.00
1.00
1.00
1.00
0.95
0.97
0.98
0.98
0.96
0.93
0.94
Moon clear
down
down
down
down
down
down
down
down
down
down
down
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
20 Clouded out · 0/100
Starting from
100
Cloud
−49
Transparency
−8
Seeing
−0
Moonlight
−0
Darkness
−43
Score
0
CLOUD 79% LOW 2% MID 12% HIGH 76% SUN -5.1° MOON -0.6° / 0% WIND 2 TEMP 17°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 55

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

202200020406
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 22:30 · OBSERVE 23:00–06:00 · 7H · MEAN 51

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

202200020406
HIGH CLOUD CLEARS 23:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 49

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

202200020406
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 42

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

202200020406
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 54

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

202200020406
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
59
Good
MOON 1%
23:00–05:00
Tomorrow · 13 Aug
28
Poor
MOON 3%
Friday · 14 Aug
72
Good
MOON 7%
22:00–00:00
Saturday · 15 Aug
83
Excellent
MOON 17%
23:00–00:00
Sunday · 16 Aug
64
Good
MOON 25%
23:00–00:00
Monday · 17 Aug
40
Fair
MOON 35%
23:00–00:00
Tuesday · 18 Aug
1
Clouded out
MOON 44%
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About this forecast

Conditions for Great Basin National Park, Nevada, United States are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →