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Ipirá

-12.158° S   39.737° W  ·  331 M
7 /100
PEAK
Cloud will spoil it. Not a night for the telescope.
NO USABLE WINDOW · ASTRO DARK 19:00–05:00 · MOON 0%
Transparency
0.33
Seeing
0.86
Cloud
45%
Moon
0%

Clouded out tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
17
18
19
20
21
22
23
00
01
02
03
04
05
06
0
0
5
7
5
1
0
0
3
1
1
1
25
0
Low cloud
84%
100%
91%
89%
92%
99%
100%
100%
95%
98%
99%
98%
41%
72%
Mid cloud
52%
96%
7%
2%
2%
5%
3%
3%
1%
2%
2%
3%
6%
2%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.10
0.10
0.19
0.20
0.22
0.23
0.23
0.23
0.24
0.23
0.27
0.30
0.33
0.34
Seeing
0.67
0.63
0.66
0.71
0.75
0.79
0.82
0.82
0.79
0.82
0.84
0.86
0.86
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
17 Clouded out · 0/100
Starting from
100
Cloud
−91
Transparency
−3
Seeing
−0
Moonlight
−0
Darkness
−5
Score
0
CLOUD 91% LOW 84% MID 52% HIGH 0% SUN 7.3° MOON 10.0° / 0% WIND 5 TEMP 21°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

17192123010305
CLOUD NEVER DROPS BELOW 45%
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 40

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

17192123010305
CLOUD BREAKS 05:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

17192123010305
CLOUD NEVER DROPS BELOW 45%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

17192123010305
CLOUD NEVER DROPS BELOW 45%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

17192123010305
CLOUD NEVER DROPS BELOW 45%
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The next week of nights

Tonight · 12 Aug
7
Clouded out
MOON 0%
Tomorrow · 13 Aug
79
Excellent
MOON 3%
19:00–05:00
Friday · 14 Aug
86
Excellent
MOON 7%
19:00–02:00
Saturday · 15 Aug
70
Good
MOON 15%
21:00–22:00
Sunday · 16 Aug
57
Good
MOON 23%
21:00–22:00
Monday · 17 Aug
12
Clouded out
MOON 32%
Tuesday · 18 Aug
1
Clouded out
MOON 42%
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Nearby locations

About this forecast

Conditions for Ipirá, 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 →