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Cangkat Jong

3.985° N   101.124° E  ·  16 M
45 /100
PEAK
Marginal, but there is a 2 hours gap from 02:00.
BEST WINDOW 02:00–04:00 · ASTRO DARK 02:00–07:00 · MOON 0%
Transparency
0.37
Seeing
1.00
Cloud
68%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
06
07
45
38
28
29
32
0
BEST WINDOW
Low cloud
2%
6%
6%
5%
3%
2%
Mid cloud
4%
11%
20%
18%
4%
6%
High cloud
66%
73%
92%
91%
94%
99%
Transparency
0.37
0.36
0.35
0.31
0.28
0.26
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
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
02 Fair · 45/100
Starting from
100
Cloud
−40
Transparency
−15
Seeing
−0
Moonlight
−0
Darkness
−0
Score
45
CLOUD 68% LOW 2% MID 4% HIGH 66% SUN -68.7° MOON -68.8° / 0% WIND 1 TEMP 26°
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 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 39

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

020406
CLOUD RETURNS 04:00
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 47

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

020406
CLOUD RETURNS 04:00MOONLIGHT 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.

020406
CLOUD NEVER DROPS BELOW 68%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

020406
CLOUD NEVER DROPS BELOW 68%
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 40

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

020406
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
02:00–04:00
Tomorrow · 13 Aug
49
Fair
MOON 1%
21:00–06:00
Friday · 14 Aug
35
Fair
MOON 5%
23:00–01:00
Saturday · 15 Aug
33
Poor
MOON 10%
Sunday · 16 Aug
32
Poor
MOON 19%
Monday · 17 Aug
41
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
21
Poor
MOON 37%
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Nearby locations

About this forecast

Conditions for Cangkat Jong, Malaysia 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 →