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Tubarão

-28.467° S   49.007° W  ·  7 M
44 /100
PEAK
Marginal, but there is a 1 hour gap from 00:00.
BEST WINDOW 00:00–01:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.17
Seeing
1.00
Cloud
42%
Moon
0%

Fair tonight

Hour by hour, local to Tubarão. 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
3
19
27
13
14
44
3
5
5
7
14
4
0
BEST WINDOW
Low cloud
6%
2%
0%
3%
6%
1%
2%
42%
39%
46%
52%
6%
2%
2%
Mid cloud
100%
98%
73%
60%
80%
87%
28%
97%
66%
57%
60%
56%
76%
83%
High cloud
87%
88%
11%
5%
38%
4%
19%
9%
93%
88%
62%
91%
97%
92%
Transparency
0.10
0.10
0.10
0.10
0.10
0.10
0.17
0.16
0.10
0.10
0.10
0.10
0.10
0.17
Seeing
0.78
0.77
0.79
0.97
1.00
1.00
1.00
1.00
1.00
0.97
0.82
0.89
0.87
0.91
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
−95
Transparency
−2
Seeing
−0
Moonlight
−0
Darkness
−3
Score
0
CLOUD 100% LOW 6% MID 100% HIGH 87% SUN -2.5° MOON 0.7° / 0% WIND 4 TEMP 15°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 43

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 55

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 01:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 38

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 01:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

18202200020406
CLOUD NEVER DROPS BELOW 42%
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 43

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

18202200020406
CLOUD BREAKS 00:00CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
44
Fair
MOON 0%
00:00–01:00
Tomorrow · 13 Aug
0
Clouded out
MOON 3%
Friday · 14 Aug
0
Clouded out
MOON 7%
Saturday · 15 Aug
2
Clouded out
MOON 15%
Sunday · 16 Aug
34
Poor
MOON 23%
Monday · 17 Aug
67
Good
MOON 32%
03:00–04:00
Tuesday · 18 Aug
36
Fair
MOON 42%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Tubarão, 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 →