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Rule Fog Hunter

Ullswater - Fog Hunter - Lake District

Penrith, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread2.9°C
Visibility15803 (Clear)
Relative Humidity81%
Wind Speed9.9m/s (moderate winds)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Moderate Fog
Ullswater
Sun, Mar 15 · 03:00–05:00 · 2h window
Medium confidence
64%
🌫️Fog Probability72.2-75%
Dewpoint Spread: 0.5°C
Visibility: 12063 (Clear)
Relative Humidity: 96%
Wind Speed: 3.8m/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 92 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Thu, Mar 12
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%
20:0021%
21:000%
22:000%
23:000%
Fri, Mar 13
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%
23:0060%
Sat, Mar 14
24:0060%
01:000%
02:000%
03:0060%
04:0060%
05:0060%
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%
Sun, Mar 15
24:000%
01:0060%
02:0060%
03:0072%
04:0075%
05:0053%
06:0053%
07:0021%
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%
21:0036%
22:000%
23:000%
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
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Fri, Mar 13 Sunrise 06:31 Sunset 18:10
01:00 ☾
-1.2°C 0mm 81% 0.21cm 1.7°C 0.25mm 0.13kPa 15803m 16m/s 9.9m/s
02:00 ☾
-2.3°C 0mm 77% 0.14cm 1.3°C 0.5mm 0.16kPa 24135m 16m/s 10m/s
03:00 ☾
-2.9°C 0mm 76% 0.28cm 0.89°C 0.63mm 0.16kPa 17234m 16m/s 9.9m/s
04:00 ☾
-3.6°C 0mm 74% 0cm 0.52°C 0.75mm 0.17kPa 24135m 17m/s 10m/s
05:00 ☾
-2.1°C 0.23mm 82% 0.23cm 0.71°C 0.94mm 0.12kPa 15735m 21m/s 11m/s
06:00 ☾
-0.8°C 1.2mm 88% 1.2cm 0.88°C 1.3mm 0.08kPa 4046m 24m/s 13m/s
07:00
0.5°C 0.61mm 96% 0.65cm 1°C 1.4mm 0.02kPa 127m 21m/s 13m/s
08:00
0.8°C 0.08mm 94% 0.16cm 1.6°C 1.7mm 0.04kPa 4204m 17m/s 11m/s
09:00
1.3°C 0.02mm 95% 0.09cm 2°C 1.8mm 0.04kPa 3983m 14m/s 9.3m/s
10:00
1.3°C 0.01mm 89% 0.1cm 2.9°C 1.9mm 0.08kPa 6882m 12m/s 8.2m/s
11:00
1.6°C 0.01mm 89% 0.11cm 3.3°C 2mm 0.09kPa 6514m 11m/s 8.1m/s
12:00
1.9°C 0.01mm 88% 0cm 3.8°C 2.1mm 0.1kPa 21646m 11m/s 7.4m/s
13:00
1.9°C 0mm 81% 0cm 4.8°C 0.06mm 0.16kPa 23935m 9.8m/s 7.2m/s
14:00
1.8°C 0mm 80% 0cm 5.1°C 0.13mm 0.18kPa 24135m 9.4m/s 7m/s
15:00
1.8°C 0mm 81% 0cm 4.8°C 0.13mm 0.16kPa 24134m 9.4m/s 7m/s
16:00
1.9°C 0mm 82% 0cm 4.7°C 0.19mm 0.16kPa 24134m 9.1m/s 5.9m/s
17:00
1.6°C 0mm 85% 0cm 4°C 0.25mm 0.12kPa 22591m 9m/s 5m/s
18:00
0.8°C 0mm 89% 0cm 2.5°C 0.25mm 0.08kPa 24135m 7.7m/s 3.9m/s
19:00 ☾
0.3°C 0mm 91% 0cm 1.6°C 0mm 0.06kPa 24135m 5.9m/s 3m/s
20:00 ☾
0°C 0mm 91% 0cm 1.2°C 0mm 0.06kPa 24135m 6.8m/s 3m/s
21:00 ☾
-0.2°C 0mm 92% 0cm 1°C 0mm 0.05kPa 24134m 4.6m/s 2.6m/s
22:00 ☾
-0.5°C 0mm 92% 0cm 0.56°C 0mm 0.05kPa 24134m 2.6m/s 2m/s
23:00 ☾
-0.5°C 0mm 94% 0cm 0.45°C 0mm 0.04kPa 24134m 3.4m/s 2.1m/s
Sat, Mar 14 Sunrise 06:28 Sunset 18:12
24:00 ☾
-0.4°C 0mm 94% 0cm 0.42°C 0mm 0.04kPa 24135m 1.9m/s 1.7m/s
01:00 ☾
-0.8°C 0mm 93% 0cm 0.2°C 0mm 0.04kPa 24135m 1.4m/s 1.5m/s
02:00 ☾
-0.9°C 0mm 93% 0cm 0.13°C 0mm 0.04kPa 24135m 1.6m/s 1.7m/s
03:00 ☾
-0.9°C 0mm 94% 0cm 0.05°C 0mm 0.04kPa 24135m 1.9m/s 1.7m/s
04:00 ☾
-0.9°C 0mm 94% 0cm -0.05°C 0mm 0.03kPa 24134m 1.9m/s 1.7m/s
05:00 ☾
-1°C 0mm 94% 0cm -0.11°C 0mm 0.04kPa 24134m 1.4m/s 1.4m/s
06:00 ☾
-1.2°C 0mm 93% 0cm -0.17°C 0mm 0.04kPa 24135m 1.5m/s 1.5m/s
07:00
-1°C 0mm 92% 0cm 0.09°C 0mm 0.05kPa 24134m 1.5m/s 1.6m/s
08:00
0.2°C 0mm 85% 0cm 2.4°C 0mm 0.11kPa 24135m 9.7m/s 3m/s
09:00
0.8°C 0mm 79% 0cm 4.2°C 0mm 0.17kPa 24135m 9.1m/s 4.7m/s
10:00
0.7°C 0mm 74% 0cm 5°C 0mm 0.23kPa 24134m 9.1m/s 6.3m/s
11:00
1.1°C 0.01mm 73% 0cm 5.6°C 0.06mm 0.24kPa 24135m 8.9m/s 6.7m/s
12:00
1.1°C 0mm 72% 0cm 5.9°C 0.19mm 0.26kPa 20418m 8.9m/s 6.7m/s
13:00
1.2°C 0mm 70% 0cm 6.2°C 0.25mm 0.28kPa 16663m 8.9m/s 6.6m/s
14:00
1.3°C 0.01mm 72% 0cm 6.1°C 0.5mm 0.27kPa 16968m 9.3m/s 7.2m/s
15:00
1.2°C 0mm 72% 0cm 5.9°C 0.75mm 0.26kPa 19061m 8.9m/s 6.6m/s
16:00
1.9°C 0mm 79% 0cm 5.2°C 0.94mm 0.19kPa 20450m 8.1m/s 5.3m/s
17:00
1.5°C 0mm 82% 0cm 4.3°C 1.1mm 0.15kPa 18552m 8.4m/s 4.5m/s
18:00
0.9°C 0mm 87% 0cm 2.9°C 1.1mm 0.1kPa 24134m 5.5m/s 2.9m/s
19:00 ☾
0.2°C 0mm 89% 0cm 1.7°C 0mm 0.07kPa 24134m 2.8m/s 2.4m/s
20:00 ☾
-0.3°C 0mm 90% 0cm 1.2°C 0mm 0.07kPa 24135m 2.5m/s 2.6m/s
21:00 ☾
-0.4°C 0mm 91% 0cm 0.93°C 0mm 0.06kPa 24135m 2.5m/s 2.7m/s
22:00 ☾
-0.6°C 0mm 91% 0cm 0.68°C 0mm 0.06kPa 24134m 2.5m/s 2.7m/s
23:00 ☾
-0.5°C 0mm 91% 0cm 0.72°C 0mm 0.06kPa 24135m 2.7m/s 2.8m/s
Sun, Mar 15 Sunrise 06:26 Sunset 18:14
24:00 ☾
-0.3°C 0mm 92% 0cm 0.86°C 0mm 0.05kPa 24134m 3.3m/s 2.9m/s
01:00 ☾
-0.2°C 0mm 93% 0cm 0.79°C 0mm 0.04kPa 24135m 3.8m/s 3.1m/s
02:00 ☾
0.3°C 0mm 95% 0cm 1.1°C 0mm 0.04kPa 18878m 4.2m/s 3.2m/s
03:00 ☾
0.6°C 0mm 96% 0cm 1.2°C 0mm 0.03kPa 12770m 5.2m/s 3.4m/s
04:00 ☾
0.4°C 0mm 96% 0cm 0.88°C 0mm 0.02kPa 12063m 5.8m/s 3.8m/s
05:00 ☾
0.7°C 0mm 96% 0cm 1.2°C 0mm 0.02kPa 13327m 7m/s 4.2m/s
06:00 ☾
0.4°C 0mm 97% 0cm 0.84°C 0mm 0.02kPa 12355m 7.4m/s 4.3m/s
07:00
0.9°C 0.02mm 95% 0.07cm 1.7°C 0.31mm 0.04kPa 16282m 9.8m/s 5.8m/s
08:00
1.4°C 0.05mm 93% 0.13cm 2.5°C 0.63mm 0.05kPa 20208m 12m/s 7.4m/s
09:00
1.9°C 0.07mm 91% 0.2cm 3.3°C 0.94mm 0.07kPa 24135m 14m/s 8.9m/s
10:00
1.5°C 0.12mm 92% 0.24cm 2.7°C 1.5mm 0.06kPa 16285m 14m/s 8.6m/s
11:00
1.1°C 0.16mm 93% 0.28cm 2.1°C 2mm 0.05kPa 8436m 14m/s 8.3m/s
12:00
0.7°C 0.21mm 95% 0.33cm 1.5°C 2.5mm 0.04kPa 586m 13m/s 8m/s
13:00
0°C 0.15mm 92% 0.22cm 1.2°C 1.8mm 0.05kPa 8435m 13m/s 7.7m/s
14:00
-0.7°C 0.09mm 89% 0.11cm 0.89°C 1.2mm 0.07kPa 16285m 13m/s 7.4m/s
15:00
-1.4°C 0.03mm 87% 0cm 0.6°C 0.5mm 0.09kPa 24135m 14m/s 7.1m/s
16:00
-1.2°C 0.03mm 88% 0cm 0.63°C 0.54mm 0.08kPa 24135m 14m/s 7.1m/s
17:00
-1°C 0.02mm 89% 0cm 0.67°C 0.58mm 0.07kPa 24135m 13m/s 7.1m/s
18:00
-0.8°C 0.02mm 90% 0cm 0.7°C 0.63mm 0.07kPa 24135m 13m/s 7.1m/s
19:00 ☾
-0.4°C 0.01mm 91% 0cm 0.88°C 0.44mm 0.06kPa 24011m 13m/s 6.6m/s
20:00 ☾
-0.1°C 0.007mm 92% 0cm 1.1°C 0.25mm 0.05kPa 23886m 13m/s 6.1m/s
21:00 ☾
0.3°C 0mm 94% 0cm 1.2°C 0.06mm 0.04kPa 23761m 12m/s 5.6m/s
22:00 ☾
0.4°C 0.003mm 92% 0cm 1.5°C 0.08mm 0.05kPa 22794m 12m/s 5.7m/s
23:00 ☾
0.5°C 0.007mm 92% 0cm 1.8°C 0.1mm 0.06kPa 21828m 11m/s 5.9m/s
Mon, Mar 16 Sunrise 06:23 Sunset 18:16
24:00 ☾
0.7°C 0.01mm 90% 0cm 2.1°C 0.13mm 0.07kPa 20861m 11m/s 6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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