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Rule Fog Hunter

Fog Hunter Forecast for Ha Long Bay, Vietnam

Ha Long, Quảng Ninh, Vietnam

The view layers Ha Long Bay's limestone towers from a boat or high viewpoint, using a junk silhouette and open water to separate overlapping karst forms.

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread0.5°C
Visibility5206 (Moderate)
Relative Humidity97%
Wind Speed4.1m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (85-hour forecast)

  • Fog Probability100% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Fog Hunter conditions across Vietnam. The requirements and hourly values below show how those signals apply at Ha Long Bay.

Explore Fog Hunter conditions across Vietnam →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Ha Long Bay during the last 365 days.

Last 30 days
0
recorded matching windows
Last 90 days
0
recorded matching windows
Last 365 days
0
recorded matching windows

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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85-hour requirements breakdown

When available, the detailed table below covers only the stated 85-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

What passed or failed, hour by hour
0matching hours in the next 85 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Bangkok
Fog Probability
≥ 75.0%
Sat, Aug 22
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sun, Aug 23
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Mon, Aug 24
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Tue, Aug 25
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Aug 26
24:000%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Asia/Bangkok
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Sun, Aug 23 Sunrise 05:32 Sunset 18:16
03:00 ☾
0% 24°C 1.3mm 97% 0cm -34° 25°C 2.8mm 0.1kPa 5206m 9.7m/s 4.1m/s
04:00 ☾
0% 24°C 3.2mm 98% 0cm -22° 25°C 5.8mm 0.07kPa 4530m 7.1m/s 3.6m/s
05:00 ☾
0% 24°C 2.8mm 99% 0cm -8.2° 25°C 9.1mm 0.04kPa 3594m 6m/s 3.4m/s
06:00 ☾
0% 25°C 3.8mm 99% 0cm 5.5° 25°C 12mm 0.03kPa 1192m 5m/s 2.9m/s
07:00
0% 25°C 3.7mm 99% 0cm 19° 25°C 16mm 0.03kPa 472m 4.4m/s 2.8m/s
08:00
0% 25°C 2.5mm 99% 0cm 33° 25°C 3.1mm 0.03kPa 278m 4m/s 2.8m/s
09:00
0% 25°C 2.8mm 99% 0cm 47° 25°C 6.4mm 0.03kPa 190m 4.9m/s 3.2m/s
10:00
0% 25°C 2.1mm 98% 0cm 61° 25°C 10mm 0.07kPa 470m 9.4m/s 4m/s
11:00
0% 25°C 0.76mm 97% 0cm 74° 25°C 12mm 0.09kPa 1681m 9.5m/s 4.2m/s
12:00
0% 24°C 0.62mm 97% 0cm 80° 25°C 13mm 0.1kPa 3210m 9.7m/s 4.3m/s
13:00
0% 24°C 0.5mm 96% 0cm 72° 25°C 14mm 0.12kPa 3767m 11m/s 5.1m/s
14:00
0% 24°C 0.12mm 96% 0cm 58° 25°C 0.63mm 0.13kPa 7516m 9.2m/s 4.4m/s
15:00
0% 25°C 0.09mm 95% 0cm 45° 25°C 1.1mm 0.16kPa 14572m 7.2m/s 3.6m/s
16:00
0% 25°C 0.04mm 95% 0cm 31° 25°C 1.7mm 0.17kPa 15152m 7.5m/s 3.6m/s
17:00
0% 25°C 0.01mm 95% 0cm 17° 25°C 2.1mm 0.17kPa 16204m 5.8m/s 2.8m/s
18:00
0% 24°C 0.01mm 95% 0cm 3° 25°C 2.4mm 0.15kPa 21484m 4.6m/s 2.3m/s
19:00 ☾
0% 25°C 0mm 95% 0cm -11° 25°C 2.6mm 0.15kPa 18039m 3.9m/s 2.1m/s
20:00 ☾
0% 24°C 0mm 95% 0cm -24° 25°C 0.19mm 0.16kPa 21920m 4.5m/s 2.2m/s
21:00 ☾
0% 24°C 0mm 94% 0cm -36° 25°C 0.31mm 0.18kPa 24134m 1.9m/s 1.4m/s
22:00 ☾
0% 24°C 0mm 94% 0cm -47° 25°C 0.44mm 0.19kPa 23165m 2m/s 1.4m/s
23:00 ☾
0% 24°C 0mm 93% 0cm -55° 25°C 0.63mm 0.22kPa 19268m 1.6m/s 1m/s
Mon, Aug 24 Sunrise 05:33 Sunset 18:15
24:00 ☾
0% 24°C 0mm 93% 0cm -58° 25°C 0.88mm 0.22kPa 23462m 1m/s 0.63m/s
01:00 ☾
0% 24°C 0mm 94% 0cm -54° 25°C 1.1mm 0.19kPa 19515m 0.82m/s 0.59m/s
02:00 ☾
0% 24°C 0mm 95% 0cm -45° 25°C 0.81mm 0.17kPa 8274m 1m/s 1m/s
03:00 ☾
0% 24°C 0mm 95% 0cm -34° 25°C 1.2mm 0.15kPa 23885m 1.4m/s 1.3m/s
04:00 ☾
0% 24°C 0mm 95% 0cm -22° 24°C 1.3mm 0.15kPa 24134m 1.3m/s 1.3m/s
05:00 ☾
0% 23°C 0mm 95% 0cm -8.3° 24°C 1.3mm 0.15kPa 24134m 1.5m/s 1.4m/s
06:00 ☾
0% 24°C 0mm 95% 0cm 5.5° 25°C 1.3mm 0.16kPa 24134m 1.6m/s 1.6m/s
07:00
0% 24°C 0mm 92% 0cm 19° 26°C 1.3mm 0.28kPa 24134m 1.8m/s 1.3m/s
08:00
0% 25°C 0mm 86% 0cm 33° 27°C 0mm 0.51kPa 24134m 2.1m/s 1.4m/s
09:00
0% 25°C 0mm 78% 0cm 47° 29°C 0.56mm 0.86kPa 8880m 2m/s 1.2m/s
10:00
0% 25°C 0mm 78% 0cm 61° 29°C 1.5mm 0.89kPa 22963m 2.6m/s 2m/s
11:00
0% 25°C 0mm 78% 0cm 74° 29°C 2.1mm 0.91kPa 23374m 2.8m/s 2.3m/s
12:00
0% 25°C 0mm 78% 0cm 80° 29°C 2.7mm 0.9kPa 11996m 2.8m/s 2.5m/s
13:00
0% 26°C 0mm 82% 0cm 71° 29°C 3.7mm 0.71kPa 12293m 2.7m/s 2.4m/s
14:00
0% 26°C 0mm 84% 0cm 58° 29°C 0.88mm 0.63kPa 9989m 2.5m/s 2.1m/s
15:00
0% 26°C 0mm 83% 0cm 44° 29°C 1.5mm 0.65kPa 12898m 2.3m/s 1.9m/s
16:00
0% 26°C 0mm 85% 0cm 30° 28°C 2.1mm 0.59kPa 18350m 2.4m/s 1.7m/s
17:00
0% 26°C 0mm 86% 0cm 16° 28°C 2.5mm 0.51kPa 24134m 2.6m/s 1.6m/s
18:00
0% 25°C 0mm 89% 0cm 2.8° 27°C 2.5mm 0.37kPa 24134m 1.6m/s 1.5m/s
19:00 ☾
0% 25°C 0mm 91% 0cm -11° 26°C 2.5mm 0.29kPa 24134m 1.1m/s 0.99m/s
20:00 ☾
0% 24°C 0mm 92% 0cm -24° 26°C 0mm 0.26kPa 24134m 0.91m/s 0.83m/s
21:00 ☾
1% 24°C 0mm 93% 0cm -37° 26°C 0mm 0.24kPa 24135m 0.53m/s 0.36m/s
22:00 ☾
1% 24°C 0mm 93% 0cm -48° 25°C 0mm 0.22kPa 24134m 0.31m/s 0.16m/s
23:00 ☾
1% 24°C 0mm 94% 0cm -55° 25°C 0mm 0.21kPa 24135m 0.31m/s 0.22m/s
Tue, Aug 25 Sunrise 05:33 Sunset 18:14
24:00 ☾
0% 24°C 0mm 94% 0cm -58° 25°C 0mm 0.19kPa 24134m 0.42m/s 0.59m/s
01:00 ☾
0% 24°C 0mm 94% 0cm -54° 25°C 0mm 0.18kPa 24135m 0.62m/s 0.78m/s
02:00 ☾
0% 24°C 0mm 94% 0cm -46° 25°C 0mm 0.17kPa 24134m 0.71m/s 0.84m/s
03:00 ☾
0% 24°C 0mm 94% 0cm -34° 25°C 0mm 0.18kPa 24134m 0.83m/s 0.87m/s
04:00 ☾
0% 24°C 0mm 94% 0cm -22° 25°C 0mm 0.19kPa 24134m 0.8m/s 0.96m/s
05:00 ☾
0% 24°C 0mm 94% 0cm -8.4° 25°C 0.06mm 0.19kPa 24135m 1.1m/s 1.2m/s
06:00 ☾
0% 24°C 0mm 94% 0cm 5.4° 25°C 0.06mm 0.2kPa 24134m 1.2m/s 1.2m/s
07:00
0% 24°C 0mm 92% 0cm 19° 25°C 0.06mm 0.25kPa 24134m 1.2m/s 1m/s
08:00
2% 25°C 0mm 89% 0cm 33° 27°C 1.1mm 0.38kPa 19227m 1.4m/s 1.2m/s
09:00
5% 25°C 0mm 86% 0cm 47° 28°C 2.1mm 0.54kPa 14319m 1.6m/s 1.4m/s
10:00
7% 26°C 0mm 82% 0cm 61° 29°C 3.1mm 0.71kPa 9412m 1.8m/s 1.6m/s
11:00
6% 25°C 0.14mm 85% 0cm 74° 28°C 4mm 0.59kPa 10049m 1.6m/s 1.4m/s
12:00
4% 25°C 0.27mm 87% 0cm 80° 27°C 4.9mm 0.48kPa 10686m 1.3m/s 1.2m/s
13:00
3% 25°C 0.41mm 89% 0cm 71° 27°C 5.9mm 0.37kPa 11324m 1m/s 0.92m/s
14:00
3% 25°C 0.27mm 90% 0cm 58° 26°C 4.3mm 0.33kPa 11254m 0.98m/s 0.91m/s
15:00
2% 25°C 0.14mm 91% 0cm 44° 26°C 2.7mm 0.3kPa 11184m 0.9m/s 0.89m/s
16:00
2% 25°C 0mm 92% 0cm 30° 26°C 1.1mm 0.26kPa 11115m 0.83m/s 0.87m/s
17:00
2% 25°C 0.08mm 93% 0cm 16° 26°C 2mm 0.22kPa 9968m 0.97m/s 1m/s
18:00
3% 25°C 0.17mm 94% 0cm 2.6° 26°C 3mm 0.19kPa 8822m 1.1m/s 1.2m/s
19:00 ☾
3% 25°C 0.25mm 95% 0cm -11° 25°C 3.9mm 0.16kPa 7676m 1.2m/s 1.3m/s
20:00 ☾
4% 25°C 0.17mm 95% 0cm -24° 25°C 3.4mm 0.17kPa 11605m 1.3m/s 1.3m/s
21:00 ☾
6% 25°C 0.08mm 95% 0cm -37° 25°C 2.9mm 0.17kPa 15533m 1.4m/s 1.4m/s
22:00 ☾
7% 25°C 0mm 94% 0cm -48° 26°C 2.4mm 0.18kPa 19462m 1.4m/s 1.4m/s
23:00 ☾
6% 25°C 0.04mm 94% 0cm -56° 26°C 2.6mm 0.19kPa 21020m 1.5m/s 1.4m/s
Wed, Aug 26 Sunrise 05:33 Sunset 18:13
24:00 ☾
6% 25°C 0.09mm 94% 0cm -58° 26°C 2.8mm 0.2kPa 22577m 1.5m/s 1.5m/s
01:00 ☾
5% 25°C 0.13mm 94% 0cm -55° 26°C 2.9mm 0.2kPa 24135m 1.5m/s 1.5m/s
02:00 ☾
4% 25°C 0.09mm 92% 0cm -46° 26°C 2.3mm 0.27kPa 19268m 1.9m/s 1.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

How opportunities work → Weather data sources →
Forecast generated

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