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Rule Fog Hunter

Fog Hunter Forecast for Derwentwater, Lake District

Penrith, England, United Kingdom

Derwentwater offers wooded islands, jetties and shoreline boulders beneath Catbells and surrounding fells, creating clear foreground-to-ridge compositions.

Currently

Real-time conditions
Fog Probability
59%
Dewpoint Spread0.1°C
Visibility142 (Dense fog)
Relative Humidity100%
Wind Speed2.3m/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
Derwentwater
Tomorrow · 20:00–22:00 · 2h window
High confidence
88%
🌫️Fog Probability100%
Dewpoint Spread: 0.1°C
Visibility: 85 (Dense fog)
Relative Humidity: 100%
Wind Speed: 2.1m/s (calm conditions)
fog weather icon
Dense Fog
Derwentwater
Tue, Jul 28 · 02:00–04:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog at Sunrise
Derwentwater
Tue, Jul 28 · 04:00–07:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Derwentwater
Tue, Jul 28 · 08:00–11:00
🌫️Fog Probability:85.4-98.1%
High

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Fog Hunter conditions across Lake District. The requirements and hourly values below show how those signals apply at Derwentwater.

Explore Fog Hunter conditions across Lake District →

Recorded match history

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

Last 30 days
0
recorded matching windows
Last 90 days
2
recorded matching windows · 73% average confidence
Last 365 days
2
recorded matching windows · 73% average confidence

Only 2 completed matches are recorded in the last 365 days—insufficient history to identify a reliable typical start time or month.

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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92-hour requirements breakdown

When available, the detailed table below covers only the stated 92-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
10matching hours in the next 92 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Sat, Jul 25
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:0046%
15:0044%
16:0044%
17:0046%
18:0021%
19:000%
20:000%
21:000%
22:0055%
23:0055%
Sun, Jul 26
24:0071%
01:0068%
02:0068%
03:0059%
04:000%
05:000%
06:000%
07:000%
08:0069%
09:0048%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:0030%
23:0030%
Mon, Jul 27
24:0030%
01:0026%
02:0048%
03:0018%
04:0018%
05:0026%
06:0030%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:0034%
17:0053%
18:000%
19:000%
20:00100%
21:00100%
22:0069%
23:0069%
Tue, Jul 28
24:0069%
01:000%
02:00100%
03:00100%
04:00100%
05:00100%
06:00100%
07:0060%
08:0094%
09:0098%
10:0085%
11:0044%
12:0021%
13:000%
14:000%
15:000%
16:0042%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Jul 29
24:000%
01:000%
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
Sun, Jul 26 Sunrise 05:13 Sunset 21:23
03:00 ☾
0% 13°C 0.39mm 100% 0cm -13° 13°C 0.56mm 0.01kPa 142m 8.5m/s 2.3m/s
04:00 ☾
0% 14°C 0.6mm 98% 0cm -8.4° 14°C 1.1mm 0.03kPa 223m 10m/s 4.7m/s
05:00 ☾
0% 13°C 0.1mm 98% 0cm -2.2° 13°C 1.6mm 0.03kPa 131m 12m/s 6.8m/s
06:00
0% 13°C 0.06mm 98% 0cm 5.1° 13°C 1.8mm 0.03kPa 279m 11m/s 5.6m/s
07:00
0% 13°C 0.04mm 98% 0cm 13° 13°C 1.9mm 0.03kPa 569m 12m/s 5.8m/s
08:00
0% 12°C 0.02mm 98% 0cm 22° 13°C 0.13mm 0.03kPa 415m 11m/s 5.5m/s
09:00
0% 12°C 0.01mm 98% 0cm 30° 12°C 0.19mm 0.04kPa 1718m 11m/s 5.5m/s
10:00
0% 12°C 0mm 97% 0cm 39° 12°C 0.31mm 0.04kPa 5656m 12m/s 5.9m/s
11:00
0% 12°C 0.01mm 96% 0cm 46° 12°C 0.5mm 0.05kPa 3603m 12m/s 6.8m/s
12:00
0% 12°C 0mm 95% 0cm 52° 12°C 0.63mm 0.07kPa 21044m 12m/s 7m/s
13:00
0% 12°C 0mm 92% 0cm 55° 13°C 0.88mm 0.13kPa 17395m 13m/s 9.8m/s
14:00
4% 12°C 0mm 93% 0cm 54° 13°C 0.19mm 0.1kPa 24134m 13m/s 8.4m/s
15:00
7% 11°C 0mm 93% 0cm 50° 12°C 0.31mm 0.09kPa 24134m 13m/s 7.3m/s
16:00
11% 11°C 0mm 93% 0cm 43° 12°C 0.44mm 0.1kPa 24134m 13m/s 6.9m/s
17:00
17% 12°C 0mm 94% 0cm 36° 13°C 0.5mm 0.09kPa 24135m 12m/s 6.5m/s
18:00
22% 12°C 0mm 95% 0cm 27° 13°C 0.63mm 0.08kPa 24135m 12m/s 6.3m/s
19:00
28% 12°C 0mm 94% 0cm 18° 13°C 0.75mm 0.09kPa 20733m 12m/s 5.1m/s
20:00
45% 12°C 0mm 93% 0cm 10° 13°C 0.13mm 0.1kPa 20971m 11m/s 4.4m/s
21:00
63% 11°C 0mm 93% 0cm 2.4° 12°C 0.19mm 0.09kPa 24135m 9.7m/s 4.2m/s
22:00 ☾
80% 11°C 0.01mm 96% 0cm -4.8° 12°C 0.25mm 0.06kPa 24134m 7.9m/s 3.3m/s
23:00 ☾
80% 11°C 0mm 96% 0cm -10° 12°C 0.25mm 0.06kPa 24135m 7.4m/s 3.2m/s
Mon, Jul 27 Sunrise 05:13 Sunset 21:23
24:00 ☾
80% 11°C 0mm 97% 0cm -14° 12°C 0.31mm 0.04kPa 24135m 6.7m/s 2.7m/s
01:00 ☾
80% 11°C 0mm 95% 0cm -16° 11°C 0.44mm 0.06kPa 22994m 8.5m/s 3.3m/s
02:00 ☾
69% 11°C 0.01mm 96% 0cm -16° 11°C 0.13mm 0.05kPa 24135m 9.2m/s 3.3m/s
03:00 ☾
57% 11°C 0mm 95% 0cm -13° 11°C 0.25mm 0.07kPa 24135m 8.7m/s 3.5m/s
04:00 ☾
46% 11°C 0.04mm 96% 0cm -8.6° 11°C 0.38mm 0.06kPa 24134m 8.9m/s 3.6m/s
05:00 ☾
37% 10°C 0mm 96% 0cm -2.4° 11°C 0.44mm 0.06kPa 24135m 8m/s 3m/s
06:00
27% 10°C 0mm 95% 0cm 4.9° 11°C 0.5mm 0.07kPa 24134m 7.8m/s 2.8m/s
07:00
18% 10°C 0mm 95% 0cm 13° 11°C 0.5mm 0.07kPa 24135m 7.7m/s 2.7m/s
08:00
12% 10°C 0mm 93% 0cm 21° 11°C 0.06mm 0.1kPa 24134m 8.1m/s 2.7m/s
09:00
6% 10°C 0mm 88% 0cm 30° 12°C 0.19mm 0.17kPa 24135m 8.3m/s 3.3m/s
10:00
0% 10°C 0mm 87% 0cm 38° 12°C 0.25mm 0.18kPa 24135m 7.9m/s 3.2m/s
11:00
0% 11°C 0mm 87% 0cm 46° 13°C 0.38mm 0.2kPa 24134m 7.9m/s 5m/s
12:00
0% 11°C 0mm 82% 0cm 52° 14°C 0.44mm 0.3kPa 24134m 8.5m/s 6.6m/s
13:00
0% 11°C 0mm 80% 0cm 54° 14°C 0.56mm 0.33kPa 24135m 7.9m/s 5.9m/s
14:00
2% 12°C 0mm 78% 0cm 54° 15°C 0.06mm 0.38kPa 24134m 8m/s 6.2m/s
15:00
4% 12°C 0.11mm 90% 0cm 50° 14°C 0.19mm 0.17kPa 20945m 6.5m/s 3.8m/s
16:00
6% 13°C 0.39mm 96% 0cm 43° 13°C 0.38mm 0.06kPa 2129m 7.8m/s 3.1m/s
17:00
5% 13°C 0.04mm 99% 0cm 35° 13°C 0.5mm 0.02kPa 159m 7m/s 2.8m/s
18:00
4% 13°C 1.3mm 99% 0cm 27° 13°C 1mm 0.01kPa 119m 6.8m/s 2.3m/s
19:00
3% 14°C 0.02mm 100% 0cm 18° 14°C 1.7mm 0.01kPa 107m 7.3m/s 2.2m/s
20:00
4% 14°C 0.12mm 100% 0cm 9.8° 14°C 0.06mm 0.01kPa 85m 8.2m/s 2.1m/s
21:00
4% 14°C 0.03mm 100% 0cm 2.2° 14°C 0.19mm 0.01kPa 79m 3.3m/s 1.9m/s
22:00 ☾
5% 14°C 0.16mm 100% 0cm -5° 14°C 0.31mm 0.01kPa 79m 3.6m/s 2.1m/s
23:00 ☾
3% 15°C 0.14mm 100% 0cm -11° 15°C 0.69mm 0.01kPa 88m 3.3m/s 2m/s
Tue, Jul 28 Sunrise 05:15 Sunset 21:22
24:00 ☾
2% 15°C 0.19mm 100% 0cm -14° 15°C 0.75mm 0.01kPa 87m 2.7m/s 1.8m/s
01:00 ☾
0% 15°C 0.26mm 100% 0cm -16° 15°C 1mm 0.01kPa 93m 3m/s 1.9m/s
02:00 ☾
0% 15°C 0.02mm 100% 0cm -16° 15°C 0.13mm 0.01kPa 89m 2.7m/s 1.8m/s
03:00 ☾
0% 15°C 0.02mm 100% 0cm -13° 15°C 0.13mm 0.01kPa 84m 3m/s 1.9m/s
04:00 ☾
0% 15°C 0mm 100% 0cm -8.8° 15°C 0.13mm 0.01kPa 86m 3.7m/s 2.1m/s
05:00 ☾
0% 15°C 0.01mm 100% 0cm -2.6° 15°C 0.13mm 0.01kPa 81m 4.2m/s 2.3m/s
06:00
0% 15°C 0.04mm 100% 0cm 4.7° 15°C 0.19mm 0.01kPa 76m 6.2m/s 2.5m/s
07:00
0% 15°C 0.26mm 100% 0cm 13° 15°C 0.31mm 0.01kPa 88m 8.8m/s 2.7m/s
08:00
0% 15°C 0.01mm 100% 0cm 21° 15°C 0.13mm 0.01kPa 105m 8.2m/s 2.5m/s
09:00
0% 16°C 0mm 99% 0cm 30° 16°C 0.13mm 0.01kPa 135m 7m/s 2.4m/s
10:00
0% 16°C 0.01mm 99% 0cm 38° 16°C 0.19mm 0.02kPa 253m 8.4m/s 2.6m/s
11:00
0% 16°C 0mm 97% 0cm 46° 16°C 0.25mm 0.05kPa 796m 9.1m/s 3.4m/s
12:00
0% 16°C 0mm 96% 0cm 51° 16°C 0.38mm 0.07kPa 21796m 9.7m/s 3.5m/s
13:00
0% 16°C 0mm 91% 0cm 54° 18°C 0.56mm 0.18kPa 21019m 9m/s 3.9m/s
14:00
1% 15°C 0mm 92% 0cm 53° 17°C 0.38mm 0.15kPa 22058m 6.6m/s 3.2m/s
15:00
1% 15°C 0mm 94% 0cm 49° 16°C 0.19mm 0.11kPa 23096m 4.3m/s 2.6m/s
16:00
2% 14°C 0mm 95% 0cm 43° 15°C 0mm 0.09kPa 24135m 1.9m/s 2m/s
17:00
2% 13°C 0mm 94% 0cm 35° 14°C 0mm 0.1kPa 24135m 2.2m/s 2.2m/s
18:00
3% 13°C 0mm 93% 0cm 27° 14°C 0mm 0.12kPa 24135m 2.4m/s 2.3m/s
19:00
3% 13°C 0mm 92% 0cm 18° 14°C 0mm 0.13kPa 24135m 2.6m/s 2.4m/s
20:00
5% 12°C 0mm 91% 0cm 9.6° 14°C 0mm 0.14kPa 24135m 2.5m/s 2.4m/s
21:00
7% 12°C 0mm 91% 0cm 2° 14°C 0mm 0.15kPa 24135m 2.3m/s 2.3m/s
22:00 ☾
9% 12°C 0mm 90% 0cm -5.2° 14°C 0mm 0.16kPa 24135m 2.1m/s 2.2m/s
23:00 ☾
7% 13°C 0mm 90% 0cm -11° 14°C 0mm 0.17kPa 24135m 2.4m/s 2.1m/s
Wed, Jul 29 Sunrise 05:16 Sunset 21:20
24:00 ☾
5% 13°C 0mm 89% 0cm -15° 15°C 0mm 0.19kPa 24135m 2.7m/s 2.1m/s
01:00 ☾
3% 14°C 0mm 88% 0cm -16° 15°C 0mm 0.2kPa 24135m 3m/s 2m/s
02:00 ☾
3% 14°C 0mm 83% 0cm -16° 17°C 0mm 0.33kPa 24135m 3.4m/s 2.3m/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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