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Rule Fog Hunter

Blea Tarn - Fog Hunter - Lake District

Chapel Stile, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread0.2°C
Visibility282 (Fog)
Relative Humidity99%
Wind Speed3.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Dense Fog at Sunset
Blea Tarn
Fri, Jun 12 · 20:00–23:00 · 3h window
Low confidence
27%
🌫️Fog Probability77.1-88.6%
Dewpoint Spread: 0.3°C
Visibility: 7682 (Moderate)
Relative Humidity: 98%
Wind Speed: 1.7m/s (calm conditions)

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create the Lake District's legendary atmospheric photography. We combine fog probability, dewpoint spread, visibility, and wind data to predict when and where mist will form over these famous lakes and valleys.

The Lake District's combination of lakes, tarns, and enclosed valleys creates ideal conditions for fog formation. Cool, calm nights allow mist to pool in valley bottoms, creating ethereal scenes at dawn that have inspired poets and photographers for centuries.

What makes the Lake District special for fog photography:

  • Lake mist - Cold water surfaces generate fog that pools over the lakes at dawn
  • Valley inversions - Mountain-ringed valleys trap mist while fells rise above
  • Romantic landscapes - This is Wordsworth and Turner country, with timeless views
  • Accessible locations - Well-maintained paths reach viewpoints above the fog layer

Peak fog season runs from late August through October, when temperature differentials are greatest. The best conditions typically occur on calm, clear nights when temperatures drop near dewpoint. Arrive before dawn—lake mist often lifts within an hour or two of sunrise. Higher viewpoints like Catbells or Loughrigg offer shots looking down at fog-filled valleys.

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Sun, Jun 7
03:0055%
04:0073%
05:0073%
06:0080%
07:00100%
08:0069%
09:0015%
10:0015%
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, Jun 8
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, Jun 9
24:000%
01:000%
02:0055%
03:0055%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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13:000%
14:000%
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16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Jun 10
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%
21:0055%
22:0055%
23:0055%
Thu, Jun 11
24:0060%
01:0069%
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
Mon, Jun 8 Sunrise 04:39 Sunset 21:43
03:00 ☾
0% 9.5°C 0.14mm 99% 0cm -9.2° 9.7°C 6.4mm 0.02kPa 282m 5.4m/s 3m/s
04:00 ☾
0% 8.5°C 0.17mm 96% 0cm -4.6° 9.1°C 6.8mm 0.05kPa 22423m 2.5m/s 1.9m/s
05:00
0% 8°C 0.65mm 96% 0cm 1.8° 8.5°C 7.3mm 0.04kPa 10646m 2.9m/s 2.1m/s
06:00
0% 7.7°C 0.7mm 97% 0cm 8.8° 8.2°C 8.2mm 0.03kPa 10734m 3.2m/s 2.1m/s
07:00
0% 7.5°C 0mm 93% 0cm 17° 8.5°C 8.6mm 0.08kPa 18811m 5.1m/s 2m/s
08:00
11% 6.4°C 0mm 83% 0cm 25° 9.2°C 0.06mm 0.2kPa 24134m 4.9m/s 2.4m/s
09:00
22% 6°C 0mm 78% 0cm 34° 9.5°C 0.06mm 0.26kPa 24135m 4.7m/s 2.4m/s
10:00
33% 6°C 0mm 74% 0cm 43° 10°C 0.13mm 0.32kPa 24134m 5.1m/s 3m/s
11:00
38% 6°C 0mm 72% 0cm 50° 11°C 0.13mm 0.36kPa 24134m 6.7m/s 5.3m/s
12:00
43% 5.4°C 0mm 69% 0cm 56° 11°C 0.19mm 0.4kPa 24135m 7.1m/s 5.8m/s
13:00
48% 4.9°C 0mm 66% 0cm 58° 11°C 0.19mm 0.46kPa 24134m 6.7m/s 5.7m/s
14:00
64% 4.5°C 0mm 64% 0cm 57° 11°C 0mm 0.47kPa 24135m 7.1m/s 6.2m/s
15:00
79% 4.8°C 0mm 65% 0cm 52° 11°C 0mm 0.46kPa 24135m 7.5m/s 6.4m/s
16:00
95% 4.9°C 0mm 66% 0cm 46° 11°C 0mm 0.46kPa 24135m 7.1m/s 5.8m/s
17:00
96% 5.1°C 0mm 67% 0cm 37° 11°C 0mm 0.43kPa 24134m 6.6m/s 5.3m/s
18:00
97% 5.8°C 0mm 73% 0cm 29° 10°C 0mm 0.34kPa 24135m 6.8m/s 5.5m/s
19:00
98% 6.1°C 0mm 78% 0cm 20° 9.8°C 0mm 0.27kPa 24134m 6.3m/s 4m/s
20:00
85% 6.5°C 0mm 83% 0cm 12° 9.3°C 0mm 0.2kPa 24135m 6.7m/s 2.7m/s
21:00
71% 6.1°C 0mm 90% 0cm 4.3° 7.6°C 0mm 0.11kPa 24134m 3.1m/s 2.6m/s
22:00 ☾
58% 5.3°C 0mm 93% 0cm -2.3° 6.4°C 0mm 0.06kPa 24134m 2.4m/s 2.5m/s
23:00 ☾
47% 5.2°C 0mm 93% 0cm -7.6° 6.2°C 0mm 0.06kPa 24134m 2.5m/s 2.4m/s
Tue, Jun 9 Sunrise 04:39 Sunset 21:43
24:00 ☾
35% 5.3°C 0mm 93% 0cm -11° 6.4°C 0mm 0.07kPa 24135m 2.7m/s 2.5m/s
01:00 ☾
24% 5.1°C 0mm 94% 0cm -13° 6°C 0.06mm 0.06kPa 24134m 2.3m/s 2.4m/s
02:00 ☾
17% 5.2°C 0mm 95% 0cm -12° 5.9°C 0mm 0.04kPa 24135m 2.2m/s 2.3m/s
03:00 ☾
11% 5.2°C 0.03mm 97% 0cm -9.2° 5.6°C 0.13mm 0.03kPa 24135m 2.6m/s 2.4m/s
04:00 ☾
4% 6°C 0.1mm 93% 0cm -4.5° 7°C 0.5mm 0.07kPa 19577m 8.5m/s 2.7m/s
05:00
4% 5.9°C 0mm 92% 0cm 1.8° 7.2°C 0.81mm 0.09kPa 17609m 8.9m/s 3.5m/s
06:00
5% 5.4°C 0mm 93% 0cm 8.9° 6.5°C 0.88mm 0.07kPa 24135m 9.3m/s 3.3m/s
07:00
5% 5.6°C 0mm 90% 0cm 17° 7.2°C 0.88mm 0.1kPa 24134m 8.3m/s 3.6m/s
08:00
14% 5.9°C 0mm 87% 0cm 25° 7.9°C 0.25mm 0.14kPa 12751m 8.5m/s 4.6m/s
09:00
24% 6.3°C 0mm 89% 0cm 34° 7.9°C 0.75mm 0.11kPa 20638m 9.9m/s 6.7m/s
10:00
33% 5.7°C 0mm 87% 0cm 43° 7.7°C 1mm 0.14kPa 20459m 10m/s 6.7m/s
11:00
23% 6°C 0mm 92% 0cm 50° 7.2°C 1.3mm 0.08kPa 14713m 9m/s 4.3m/s
12:00
14% 6.6°C 0mm 92% 0cm 56° 7.8°C 1.8mm 0.08kPa 13461m 10m/s 6.4m/s
13:00
4% 7.2°C 0mm 89% 0cm 58° 8.8°C 2.2mm 0.12kPa 13605m 12m/s 8.5m/s
14:00
12% 7.3°C 0mm 90% 0cm 57° 8.9°C 0.5mm 0.12kPa 13103m 13m/s 8.6m/s
15:00
19% 7.5°C 0mm 89% 0cm 53° 9.1°C 0.88mm 0.12kPa 20867m 14m/s 8.7m/s
16:00
27% 6.9°C 0mm 81% 0cm 46° 10°C 1.1mm 0.24kPa 24135m 14m/s 9.5m/s
17:00
28% 6.2°C 0mm 75% 0cm 37° 10°C 1.1mm 0.32kPa 24135m 13m/s 8.8m/s
18:00
29% 6°C 0mm 74% 0cm 29° 10°C 1.2mm 0.32kPa 24135m 12m/s 7.5m/s
19:00
30% 6.2°C 0mm 78% 0cm 20° 9.9°C 1.2mm 0.27kPa 24134m 9.7m/s 5.8m/s
20:00
31% 5.8°C 0mm 80% 0cm 12° 9°C 0mm 0.23kPa 24134m 8.7m/s 3.5m/s
21:00
33% 5.1°C 0mm 85% 0cm 4.4° 7.4°C 0mm 0.15kPa 24134m 1.6m/s 1.7m/s
22:00 ☾
34% 4.6°C 0mm 89% 0cm -2.2° 6.2°C 0mm 0.1kPa 24134m 1.4m/s 1.5m/s
23:00 ☾
27% 4.5°C 0mm 90% 0cm -7.5° 5.9°C 0mm 0.09kPa 24134m 1.4m/s 1.5m/s
Wed, Jun 10 Sunrise 04:38 Sunset 21:44
24:00 ☾
21% 4.7°C 0mm 90% 0cm -11° 6.2°C 0mm 0.09kPa 24134m 1.5m/s 1.6m/s
01:00 ☾
14% 4.8°C 0.04mm 92% 0cm -12° 5.9°C 0.06mm 0.07kPa 24134m 1.7m/s 1.7m/s
02:00 ☾
12% 5.4°C 0.47mm 92% 0cm -12° 6.6°C 0.31mm 0.08kPa 16553m 2.5m/s 1.9m/s
03:00 ☾
11% 5.9°C 1.1mm 96% 0cm -9.1° 6.6°C 1.3mm 0.04kPa 9209m 2.3m/s 1.7m/s
04:00 ☾
9% 6°C 0.09mm 96% 0cm -4.5° 6.6°C 2.3mm 0.04kPa 18373m 2.2m/s 1.6m/s
05:00
8% 5.6°C 0mm 94% 0cm 1.9° 6.4°C 2.5mm 0.05kPa 20177m 1.7m/s 1.5m/s
06:00
7% 5.6°C 0mm 93% 0cm 8.9° 6.7°C 2.6mm 0.07kPa 24135m 2.2m/s 1.4m/s
07:00
6% 5.5°C 0mm 88% 0cm 17° 7.3°C 2.8mm 0.12kPa 24135m 4.4m/s 1.6m/s
08:00
7% 5.7°C 0mm 91% 0cm 26° 7.2°C 0.13mm 0.09kPa 24134m 3.9m/s 1.9m/s
09:00
7% 5.7°C 0mm 89% 0cm 34° 7.3°C 0.25mm 0.11kPa 24135m 5.8m/s 1.7m/s
10:00
8% 5.7°C 0mm 81% 0cm 43° 8.8°C 0.38mm 0.21kPa 20222m 6.5m/s 4.4m/s
11:00
6% 5.8°C 0mm 85% 0cm 50° 8.1°C 0.69mm 0.16kPa 21670m 6.8m/s 3.9m/s
12:00
4% 6.1°C 0mm 81% 0cm 56° 9.2°C 0.75mm 0.22kPa 24134m 7m/s 5.4m/s
13:00
2% 6.7°C 0mm 80% 0cm 59° 10°C 1mm 0.24kPa 18068m 7.8m/s 6.6m/s
14:00
12% 6.2°C 0mm 84% 0cm 57° 8.7°C 0.69mm 0.18kPa 20090m 5.7m/s 5m/s
15:00
21% 5.7°C 0mm 89% 0cm 53° 7.5°C 0.38mm 0.12kPa 22113m 3.6m/s 3.3m/s
16:00
31% 5.1°C 0mm 93% 0cm 46° 6.2°C 0.06mm 0.07kPa 24135m 1.5m/s 1.7m/s
17:00
31% 4.9°C 0mm 93% 0cm 38° 5.9°C 0.06mm 0.06kPa 24135m 1.5m/s 1.6m/s
18:00
30% 4.6°C 0mm 94% 0cm 29° 5.5°C 0.06mm 0.06kPa 24135m 1.5m/s 1.5m/s
19:00
30% 4.3°C 0mm 94% 0cm 20° 5.2°C 0.06mm 0.05kPa 24135m 1.4m/s 1.5m/s
20:00
35% 4.5°C 0mm 94% 0cm 12° 5.3°C 0.04mm 0.05kPa 24135m 1.9m/s 1.8m/s
21:00
39% 4.7°C 0mm 95% 0cm 4.5° 5.5°C 0.02mm 0.05kPa 24135m 2.3m/s 2.1m/s
22:00 ☾
44% 4.9°C 0mm 95% 0cm -2.1° 5.6°C 0mm 0.05kPa 24135m 2.8m/s 2.4m/s
23:00 ☾
40% 5.6°C 0mm 96% 0cm -7.4° 6.3°C 0.06mm 0.04kPa 16557m 3.7m/s 2.6m/s
Thu, Jun 11 Sunrise 04:38 Sunset 21:45
24:00 ☾
36% 6.4°C 0mm 97% 0cm -11° 6.9°C 0.13mm 0.03kPa 8979m 4.7m/s 2.9m/s
01:00 ☾
32% 7.2°C 0mm 98% 0cm -12° 7.5°C 0.19mm 0.02kPa 1400m 5.6m/s 3.1m/s
02:00 ☾
26% 7.6°C 0.66mm 98% 0cm -12° 7.8°C 1.3mm 0.02kPa 998m 5.7m/s 3.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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