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Kulathummal

8.507° N   77.082° E  ·  76 M
39 /100
PEAK
Marginal, but there is a 1 hour gap from 01:30.
BEST WINDOW 01:30–02:30 · ASTRO DARK 23:30–05:30 · MOON 0%
Transparency
0.25
Seeing
0.85
Cloud
56%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
23
00
01
02
03
04
05
06
29
23
39
1
19
3
0
0
BEST WINDOW
Low cloud
45%
34%
18%
98%
37%
91%
98%
95%
Mid cloud
3%
3%
3%
14%
6%
6%
2%
2%
High cloud
31%
81%
46%
11%
94%
92%
63%
76%
Transparency
0.20
0.21
0.22
0.22
0.21
0.21
0.25
0.26
Seeing
0.82
0.83
0.82
0.83
0.84
0.85
0.79
0.83
Moon clear
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
23 Poor · 29/100
Starting from
100
Cloud
−55
Transparency
−14
Seeing
−1
Moonlight
−0
Darkness
−0
Score
29
CLOUD 63% LOW 45% MID 3% HIGH 31% SUN -62.6° MOON -61.1° / 0% WIND 4 TEMP 25°
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 01:00 · OBSERVE 01:30–02:30 · 1H · MEAN 38

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

23010305
HIGH CLOUD CLEARS 01:30CLOUD RETURNS 02:30
SET UP 01:00 · OBSERVE 01:30–02:30 · 1H · MEAN 45

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

23010305
HIGH CLOUD CLEARS 01:30CLOUD RETURNS 02:30MOONLIGHT 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.

23010305
CLOUD NEVER DROPS BELOW 56%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

23010305
CLOUD NEVER DROPS BELOW 56%
SET UP 01:00 · OBSERVE 01:30–02:30 · 1H · MEAN 37

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

23010305
HIGH CLOUD CLEARS 01:30CLOUD RETURNS 02:30
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The next week of nights

Tonight · 12 Aug
39
Fair
MOON 0%
01:30–02:30
Tomorrow · 13 Aug
21
Poor
MOON 2%
Friday · 14 Aug
28
Poor
MOON 6%
Saturday · 15 Aug
0
Clouded out
MOON 13%
Sunday · 16 Aug
1
Clouded out
MOON 21%
Monday · 17 Aug
4
Clouded out
MOON 30%
Tuesday · 18 Aug
29
Poor
MOON 39%
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About this forecast

Conditions for Kulathummal, India 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 →