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Chai Nat

15.186° N   100.124° E  ·  26 M
43 /100
PEAK
Marginal, but there is a 2 hours gap from 00:00.
BEST WINDOW 00:00–02:00 · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.60
Seeing
0.83
Cloud
66%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
43
37
34
20
6
17
0
BEST WINDOW
Low cloud
0%
2%
5%
2%
2%
2%
1%
Mid cloud
19%
14%
15%
48%
92%
52%
96%
High cloud
61%
81%
85%
97%
97%
91%
94%
Transparency
0.60
0.58
0.58
0.56
0.55
0.56
0.53
Seeing
0.73
0.72
0.71
0.79
0.83
0.80
0.80
Moon clear
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
00 Fair · 43/100
Starting from
100
Cloud
−45
Transparency
−9
Seeing
−3
Moonlight
−0
Darkness
−0
Score
43
CLOUD 66% LOW 0% MID 19% HIGH 61% SUN -59.2° MOON -58.0° / 0% WIND 5 TEMP 29°
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 00:00–02:00 · 2H · MEAN 39

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

00020406
SET UP 23:30 · OBSERVE 00:00–02:00 · 2H · MEAN 39

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

00020406
MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 36

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

00020406
CLOUD 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.

00020406
CLOUD NEVER DROPS BELOW 66%
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 39

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

00020406
CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
43
Fair
MOON 0%
00:00–02:00
Tomorrow · 13 Aug
33
Poor
MOON 1%
Friday · 14 Aug
37
Fair
MOON 5%
22:00–23:00
Saturday · 15 Aug
29
Poor
MOON 10%
Sunday · 16 Aug
31
Poor
MOON 19%
Monday · 17 Aug
5
Clouded out
MOON 28%
Tuesday · 18 Aug
8
Clouded out
MOON 37%
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About this forecast

Conditions for Chai Nat, Thailand 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 →