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Rule Fog Hunter

Aysgarth Falls - Fog Hunter - Yorkshire Dales

Aysgarth, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread0.2°C
Visibility7203 (Moderate)
Relative Humidity98%
Wind Speed2.2m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Moderate Fog
Aysgarth Falls
Today · 22:00–01:00 · 3h window
Low confidence
36%
🌫️Fog Probability60.7-64.1%
Dewpoint Spread: 0.1°C
Visibility: 535 (Fog)
Relative Humidity: 99%
Wind Speed: 2.1m/s (calm conditions)
fog weather icon
Dense Fog
Aysgarth Falls
Tomorrow · 02:00–04:00
🌫️Fog Probability:100%
High
fog weather icon
Moderate Fog at Sunset
Aysgarth Falls
Wed, Apr 22 · 19:00–20:00
🌫️Fog Probability:66.7%
Low

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when temperature inversions and fog conditions create atmospheric valley scenes in the Yorkshire Dales. We track overnight cooling, humidity, wind speed, and topography to identify when fog fills limestone valleys while peaks emerge above.

The Yorkshire Dales' distinctive U-shaped valleys carved by glaciers create natural bowls that trap cold air and fog, while high ground like Pen-y-ghent and Ingleborough rises above the mist layer. The combination of limestone formations, ancient stone walls, and historic barns emerging from fog creates quintessentially northern English scenes.

What makes Yorkshire Dales fog photography special:

  • Valley inversions - Deep dales fill with fog while peaks and high pastures stay clear in sunshine
  • Limestone drama - Malham Cove's 260-foot cliff and limestone pavement emerge from dawn mist
  • Stone-wall patterns - Traditional dry-stone walls create geometric patterns disappearing into fog
  • Historic structures - Ribblehead Viaduct's 24 arches pierce fog layers like a Victorian ghost ship

Malham Cove becomes magical when fog pools in the valley below its curved limestone amphitheater—arrive before dawn to capture the cliffs emerging as mist burns off. Ribblehead Viaduct crossing fog-filled valleys creates iconic compositions, especially with early light. From Pen-y-ghent summit, fog inversions reveal only the highest peaks above a sea of white. The limestone pavements near Malham and Ingleborough become otherworldly when patches of fog drift through their geometric patterns. Best conditions occur on clear, calm autumn and winter nights when valley temperatures drop rapidly. Winter fog can persist all day in sheltered valleys, providing extended shooting windows.

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72-hour requirements breakdown

What passed or failed, hour by hour
5matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Mon, Apr 13
20:000%
21:000%
22:000%
23:000%
Tue, Apr 14
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%
20:0044%
21:0055%
22:0061%
23:0064%
Wed, Apr 15
24:0063%
01:0055%
02:00100%
03:00100%
04:0055%
05:0053%
06:0044%
07:0036%
08:0026%
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%
Thu, Apr 16
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%
Fri, Apr 17
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%
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
Europe/London
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
Tue, Apr 14 Sunrise 06:09 Sunset 20:08
21:00
0% 7.2°C 0mm 98% 0cm -7.7° 7.4°C 0.31mm 0.02kPa 7203m 5m/s 2.2m/s
22:00
0% 7.2°C 0.03mm 99% 0cm -15° 7.4°C 0.31mm 0.01kPa 1023m 4.2m/s 2m/s
23:00
0% 7.5°C 0.01mm 99% 0cm -21° 7.6°C 0.38mm 0.01kPa 535m 5.6m/s 2.1m/s
Wed, Apr 15 Sunrise 06:09 Sunset 20:08
24:00
0% 7.6°C 0.01mm 99% 0cm -24° 7.7°C 0.38mm 0.01kPa 306m 5.6m/s 2.1m/s
01:00
0% 7.6°C 0mm 99% 0cm -26° 7.7°C 0.38mm 0.01kPa 216m 7.9m/s 2.1m/s
02:00
0% 7.7°C 0.02mm 99% 0cm -25° 7.8°C 0mm 0.01kPa 175m 8.2m/s 2.3m/s
03:00
0% 7.8°C 0.06mm 99% 0cm -22° 7.9°C 0.06mm 0.01kPa 157m 10m/s 2.4m/s
04:00
0% 7.9°C 0.29mm 99% 0cm -16° 8.1°C 0.25mm 0.01kPa 212m 12m/s 2.5m/s
05:00
0% 8.1°C 0.01mm 98% 0cm -9.6° 8.4°C 0.38mm 0.02kPa 183m 11m/s 3m/s
06:00
0% 8.6°C 0mm 98% 0cm -1.6° 8.9°C 0.38mm 0.02kPa 100m 11m/s 3.7m/s
07:00
0% 8.7°C 0mm 98% 0cm 6.9° 9°C 0.38mm 0.03kPa 10602m 11m/s 3.2m/s
08:00
0% 8.7°C 0mm 95% 0cm 16° 9.6°C 0mm 0.06kPa 24135m 12m/s 3.2m/s
09:00
0% 9.1°C 0mm 93% 0cm 24° 10°C 0mm 0.09kPa 9454m 11m/s 3.3m/s
10:00
0% 9.4°C 0mm 92% 0cm 32° 11°C 0mm 0.1kPa 3636m 11m/s 3.5m/s
11:00
0% 9.8°C 0mm 89% 0cm 39° 12°C 0mm 0.15kPa 21057m 11m/s 4.6m/s
12:00
0% 9.9°C 0.01mm 90% 0cm 44° 12°C 0.25mm 0.14kPa 23665m 12m/s 6.3m/s
13:00
0% 9.5°C 0.01mm 90% 0cm 46° 11°C 0.5mm 0.14kPa 24134m 13m/s 6.9m/s
14:00
1% 9.7°C 0mm 85% 0cm 44° 12°C 0.13mm 0.21kPa 21692m 14m/s 8.3m/s
15:00
2% 9.4°C 0mm 83% 0cm 40° 12°C 0.38mm 0.24kPa 20478m 15m/s 8.6m/s
16:00
3% 8.7°C 0mm 88% 0cm 34° 11°C 0.81mm 0.16kPa 23678m 15m/s 8.5m/s
17:00
2% 8.4°C 0mm 89% 0cm 26° 10°C 1.1mm 0.14kPa 23860m 13m/s 8m/s
18:00
1% 8°C 0mm 87% 0cm 18° 10°C 1.1mm 0.17kPa 23802m 13m/s 7.4m/s
19:00
0% 6.7°C 0mm 84% 0cm 9.3° 9.2°C 1.1mm 0.18kPa 24134m 14m/s 7.8m/s
20:00
10% 5.7°C 0mm 88% 0cm 7.7°C 0mm 0.13kPa 24135m 14m/s 7m/s
21:00
21% 5.2°C 0mm 90% 0cm -7.4° 6.6°C 0mm 0.09kPa 24134m 13m/s 5.1m/s
22:00
31% 4.7°C 0mm 87% 0cm -15° 6.7°C 0mm 0.12kPa 24135m 14m/s 6.9m/s
23:00
27% 4.7°C 0.08mm 90% 0cm -20° 6.3°C 0.06mm 0.1kPa 24135m 15m/s 7.3m/s
Thu, Apr 16 Sunrise 06:06 Sunset 20:10
24:00
23% 5°C 0mm 90% 0cm -24° 6.5°C 0.06mm 0.1kPa 24135m 16m/s 8.1m/s
01:00
19% 5.1°C 0mm 90% 0cm -26° 6.6°C 0.13mm 0.09kPa 24135m 16m/s 8.2m/s
02:00
17% 5.1°C 0mm 88% 0cm -25° 7°C 0.06mm 0.12kPa 24134m 16m/s 8.1m/s
03:00
15% 4.8°C 0mm 87% 0cm -21° 6.9°C 0.06mm 0.13kPa 24134m 16m/s 9m/s
04:00
13% 5°C 0mm 89% 0cm -16° 6.6°C 0.06mm 0.11kPa 24135m 16m/s 9.1m/s
05:00
12% 5°C 0mm 90% 0cm -9.3° 6.5°C 0.13mm 0.09kPa 24135m 15m/s 9m/s
06:00
12% 4.5°C 0mm 91% 0cm -1.2° 5.9°C 0.19mm 0.09kPa 24135m 15m/s 8.7m/s
07:00
11% 4.4°C 0mm 88% 0cm 7.2° 6.3°C 0.19mm 0.12kPa 24135m 14m/s 8.7m/s
08:00
22% 4°C 0mm 84% 0cm 16° 6.6°C 0mm 0.16kPa 24135m 13m/s 8.9m/s
09:00
32% 4°C 0mm 82% 0cm 24° 6.9°C 0.06mm 0.18kPa 24134m 13m/s 8.5m/s
10:00
43% 5.3°C 0mm 88% 0cm 32° 7.2°C 0.13mm 0.12kPa 24080m 12m/s 7.5m/s
11:00
45% 5°C 0mm 80% 0cm 39° 8.2°C 0.25mm 0.22kPa 24010m 12m/s 8.4m/s
12:00
46% 4.8°C 0mm 75% 0cm 44° 9°C 0.38mm 0.28kPa 24130m 12m/s 8.3m/s
13:00
48% 4.6°C 0mm 69% 0cm 46° 10°C 0.44mm 0.38kPa 24135m 12m/s 8.3m/s
14:00
44% 4.5°C 0mm 69% 0cm 45° 10°C 0.06mm 0.39kPa 24134m 11m/s 7.9m/s
15:00
40% 4.7°C 0mm 67% 0cm 41° 11°C 0.06mm 0.42kPa 24134m 11m/s 7.6m/s
16:00
36% 5°C 0mm 68% 0cm 34° 11°C 0.13mm 0.41kPa 24134m 10m/s 7.1m/s
17:00
26% 4.9°C 0mm 70% 0cm 27° 10°C 0.13mm 0.37kPa 24134m 9.4m/s 6.6m/s
18:00
16% 5.1°C 0mm 75% 0cm 18° 9.4°C 0.13mm 0.29kPa 24135m 8.8m/s 5.3m/s
19:00
6% 5.4°C 0mm 82% 0cm 9.6° 8.3°C 0.13mm 0.19kPa 24134m 8.4m/s 3.5m/s
20:00
4% 4.9°C 0mm 90% 0cm 1.3° 6.5°C 0mm 0.1kPa 24135m 2.1m/s 2.2m/s
21:00
2% 4.7°C 0mm 91% 0cm -7.1° 6°C 0mm 0.08kPa 24134m 1.9m/s 2m/s
22:00
0% 4.8°C 0mm 92% 0cm -14° 6°C 0mm 0.07kPa 24135m 1.9m/s 1.9m/s
23:00
0% 4.7°C 0mm 93% 0cm -20° 5.8°C 0mm 0.06kPa 24135m 2m/s 2.1m/s
Fri, Apr 17 Sunrise 06:04 Sunset 20:12
24:00
0% 4.8°C 0mm 93% 0cm -24° 5.9°C 0mm 0.07kPa 24134m 1.8m/s 1.8m/s
01:00
0% 4.8°C 0mm 91% 0cm -25° 6.2°C 0mm 0.09kPa 24135m 1.5m/s 1.5m/s
02:00
0% 5.1°C 0mm 86% 0cm -24° 7.4°C 0mm 0.15kPa 24135m 3.7m/s 2.7m/s
03:00
0% 5.4°C 0mm 80% 0cm -21° 8.6°C 0mm 0.22kPa 24135m 5.8m/s 3.9m/s
04:00
0% 5.6°C 0mm 75% 0cm -16° 9.9°C 0mm 0.31kPa 24135m 8m/s 5.1m/s
05:00
0% 5.9°C 0mm 76% 0cm -8.9° 10°C 0mm 0.3kPa 24135m 8.2m/s 5m/s
06:00
0% 6.2°C 0mm 77% 0cm -0.79° 10°C 0mm 0.29kPa 24135m 8.3m/s 4.9m/s
07:00
0% 6.5°C 0mm 78% 0cm 7.5° 10°C 0mm 0.28kPa 24135m 8.5m/s 4.7m/s
08:00
0% 6.9°C 0.02mm 79% 0cm 16° 10°C 0.02mm 0.26kPa 24135m 9m/s 5m/s
09:00
0% 7.3°C 0.04mm 80% 0cm 25° 11°C 0.04mm 0.25kPa 24135m 9.6m/s 5.2m/s
10:00
0% 7.6°C 0.06mm 81% 0cm 33° 11°C 0.06mm 0.24kPa 24135m 10m/s 5.4m/s
11:00
0% 7.8°C 0.05mm 82% 0cm 40° 11°C 0.15mm 0.23kPa 24135m 10m/s 5.3m/s
12:00
0% 8°C 0.03mm 84% 0cm 44° 11°C 0.23mm 0.21kPa 24135m 10m/s 5.2m/s
13:00
0% 8.2°C 0.02mm 85% 0cm 46° 11°C 0.31mm 0.19kPa 24135m 10m/s 5.1m/s
14:00
0% 7.8°C 0.01mm 87% 0cm 45° 9.8°C 0.25mm 0.15kPa 24135m 9.8m/s 4.6m/s
15:00
0% 7.4°C 0.007mm 90% 0cm 41° 9°C 0.19mm 0.12kPa 24135m 9.5m/s 4.1m/s
16:00
0% 7°C 0mm 92% 0cm 35° 8.2°C 0.13mm 0.09kPa 24135m 9.3m/s 3.6m/s
17:00
0% 6.5°C 0mm 92% 0cm 27° 7.8°C 0.15mm 0.09kPa 24135m 9.9m/s 3.9m/s
18:00
1% 6°C 0mm 91% 0cm 18° 7.4°C 0.17mm 0.09kPa 24135m 10m/s 4.2m/s
19:00
1% 5.6°C 0mm 91% 0cm 9.8° 7°C 0.19mm 0.09kPa 24135m 11m/s 4.5m/s
20:00
4% 5°C 0mm 90% 0cm 1.5° 6.5°C 0.13mm 0.09kPa 24135m 12m/s 4.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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