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Jales

-20.269° S   50.546° W  ·  507 M
80 /100
PEAK
A genuinely good night — 3 hours of clear, dark sky from 02:00.
BEST WINDOW 02:00–05:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.95
Seeing
1.00
Cloud
27%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
05
06
07
0
35
80
56
33
45
27
25
42
60
47
9
15
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
1%
2%
9%
43%
56%
52%
77%
67%
41%
23%
43%
99%
71%
17%
High cloud
70%
61%
20%
13%
55%
16%
8%
56%
49%
34%
25%
19%
1%
0%
Transparency
1.00
0.95
0.93
0.93
0.85
0.83
0.81
0.83
0.85
0.81
0.77
0.81
0.92
0.93
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
0.97
0.93
0.91
1.00
0.96
0.84
0.83
0.84
Moon clear
0%
down
down
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
18 Clouded out · 0/100
Starting from
100
Cloud
−39
Transparency
−0
Seeing
−0
Moonlight
−0
Darkness
−61
Score
0
CLOUD 70% LOW 0% MID 1% HIGH 70% SUN 1.1° MOON 4.3° / 0% WIND 2 TEMP 29°
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 49

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

18202200020406
CLOUD BREAKS 02:00CLOUD RETURNS 05:00
SET UP 18:30 · OBSERVE 19:00–22:00 · 3H · MEAN 63

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

18202200020406
CLOUD RETURNS 22:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 44

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

18202200020406
CLOUD BREAKS 02:00CLOUD RETURNS 05:00
SET UP 19:30 · OBSERVE 20:00–22:00 · 2H · MEAN 55

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

18202200020406
HIGH CLOUD CLEARS 20:00CLOUD RETURNS 22:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 43

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

18202200020406
CLOUD BREAKS 02:00CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
80
Excellent
MOON 0%
02:00–05:00
Tomorrow · 13 Aug
99
Excellent
MOON 3%
20:00–06:00
Friday · 14 Aug
100
Excellent
MOON 7%
20:00–04:00
Saturday · 15 Aug
99
Excellent
MOON 15%
21:00–22:00
Sunday · 16 Aug
97
Excellent
MOON 23%
03:00–04:00
Monday · 17 Aug
94
Excellent
MOON 32%
03:00–04:00
Tuesday · 18 Aug
80
Excellent
MOON 42%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Jales, Brazil 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 →