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Rule Fog Hunter

Olympic Rainforest - Fog Hunter - Pacific Northwest

Forks, Washington, United States

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread0.2°C
Visibility480 (Fog)
Relative Humidity99%
Wind Speed1.9m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Los_Angeles
fog weather icon
Next opportunity
Moderate Fog
Olympic Rainforest
Today · 18:00–19:00 · 1h window
Medium confidence
60%
🌫️Fog Probability74.6%
Dewpoint Spread: 0.4°C
Visibility: 18662 (Clear)
Relative Humidity: 98%
Wind Speed: 2.0m/s (calm conditions)
fog weather icon
Moderate Fog at Sunset
Olympic Rainforest
Today · 19:00–20:00
🌫️Fog Probability:84.8%
High
fog weather icon
Dense Fog
Olympic Rainforest
Tomorrow · 24:00–02:00
🌫️Fog Probability:88.6-98.5%
High
fog weather icon
Dense Fog at Sunrise
Olympic Rainforest
Tomorrow · 06:00–07:00
🌫️Fog Probability:98.5%
High
fog weather icon
Dense Fog
Olympic Rainforest
Tomorrow · 07:00–09:00
🌫️Fog Probability:85.6-97.3%
High
fog weather icon
Moderate Fog
Olympic Rainforest
Tomorrow · 23:00–02:00
🌫️Fog Probability:62.7-74.6%
Medium
fog weather icon
Moderate Fog
Olympic Rainforest
Sun, Apr 26 · 17:00–19:00
🌫️Fog Probability:73.8-77.9%
Medium
+8 more windows in the next 10 days

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create the Pacific Northwest's legendary atmospheric photography. We combine fog probability, dewpoint spread, visibility, and wind data to predict when and where fog will form.

The Pacific Northwest's unique geography—where cold ocean currents meet temperate rainforests and volcanic peaks—creates fog conditions unmatched anywhere in North America. From the Hoh Rainforest's ethereal mist to the Columbia River Gorge's valley fog, this region offers year-round fog photography opportunities.

What makes the Pacific Northwest special for fog photography:

  • Marine influence - Cold Pacific currents generate coastal fog that rolls inland through river valleys
  • Rainforest atmosphere - Olympic's temperate rainforest creates perpetual mist and filtered light
  • Temperature inversions - Mountain valleys trap fog below while peaks remain clear
  • Varied terrain - Photograph fog against waterfalls, old-growth forests, sea stacks, and volcanic peaks

Peak fog season runs from late summer through fall, when temperature differentials between land and sea are greatest. Morning fog often burns off by midday, so arrive before sunrise for the most dramatic conditions. The Columbia River Gorge is particularly reliable for valley fog, while coastal locations like Cannon Beach offer fog throughout the year.

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72-hour requirements breakdown

What passed or failed, hour by hour
18matching hours in the next 86 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Los_Angeles
Fog Probability
≥ 60.0%
Mon, Apr 20
21:000%
22:0057%
23:0085%
Tue, Apr 21
24:0063%
01:0063%
02:0080%
03:0075%
04:0075%
05:0063%
06:0063%
07:0039%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:0075%
19:0085%
20:0047%
21:0044%
22:0044%
23:0054%
Wed, Apr 22
24:0089%
01:0099%
02:0055%
03:0054%
04:0055%
05:000%
06:0099%
07:0097%
08:0086%
09:0039%
10:0033%
11:0028%
12:0050%
13:0046%
14:0017%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:0039%
23:0075%
Thu, Apr 23
24:0075%
01:0063%
02:0057%
03:0057%
04:0057%
05:0057%
06:0057%
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%
20:0043%
21:0043%
22:0043%
23:0043%
Fri, Apr 24
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
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
America/Los_Angeles
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 21 Sunrise 06:16 Sunset 20:16
12:00
0% 9.5°C 2.3mm 99% 0cm 51° 9.7°C 2.3mm 0.02kPa 480m 5.4m/s 1.9m/s
13:00
0% 9.6°C 3.1mm 99% 0cm 54° 9.8°C 4.3mm 0.02kPa 249m 5.7m/s 2.6m/s
14:00
0% 9.4°C 1.8mm 99% 0cm 53° 9.6°C 7.1mm 0.01kPa 308m 4.7m/s 1.9m/s
15:00
0% 9.4°C 0.29mm 99% 0cm 48° 9.6°C 8.1mm 0.02kPa 2284m 4.5m/s 2.2m/s
16:00
0% 9.3°C 0.38mm 99% 0cm 41° 9.5°C 8.5mm 0.02kPa 5621m 4.5m/s 2.1m/s
17:00
0% 9°C 0.29mm 98% 0cm 32° 9.3°C 9.1mm 0.02kPa 6846m 4.7m/s 2.2m/s
18:00
0% 8.7°C 0.04mm 98% 0cm 22° 9.1°C 0.19mm 0.03kPa 18662m 5.1m/s 2m/s
19:00
0% 8.6°C 0mm 98% 0cm 12° 8.9°C 0.19mm 0.03kPa 21441m 2m/s 0.65m/s
20:00
0% 8.5°C 0.01mm 98% 0cm 2.1° 8.8°C 0.25mm 0.03kPa 24135m 2.6m/s 1.3m/s
21:00
0% 8.2°C 0mm 97% 0cm -7.4° 8.6°C 0.25mm 0.03kPa 24134m 0.8m/s 0.75m/s
22:00
0% 7.9°C 0mm 98% 0cm -16° 8.3°C 0.25mm 0.03kPa 22896m 0.4m/s 0.36m/s
23:00
0% 7.5°C 0mm 98% 0cm -23° 7.7°C 0.25mm 0.02kPa 23275m 2.3m/s 1.6m/s
Wed, Apr 22 Sunrise 06:15 Sunset 20:17
24:00
0% 7.8°C 0.01mm 98% 0cm -27° 8.1°C 0mm 0.02kPa 21204m 2.3m/s 1.4m/s
01:00
0% 8.1°C 0.06mm 98% 0cm -30° 8.4°C 0.06mm 0.02kPa 10409m 4.4m/s 1.6m/s
02:00
0% 8.2°C 0.2mm 98% 0cm -29° 8.5°C 0.25mm 0.02kPa 9290m 5.4m/s 2m/s
03:00
0% 8°C 0.27mm 98% 0cm -25° 8.2°C 0.5mm 0.02kPa 20462m 3.9m/s 1.5m/s
04:00
0% 7.8°C 0.36mm 99% 0cm -20° 8°C 0.81mm 0.01kPa 12345m 3m/s 1.5m/s
05:00
0% 7.9°C 0.13mm 99% 0cm -12° 8.1°C 1.1mm 0.01kPa 10696m 4.1m/s 1.9m/s
06:00
0% 8°C 0.06mm 98% 0cm -3° 8.2°C 0.13mm 0.02kPa 14030m 4.4m/s 2m/s
07:00
0% 8°C 0.01mm 99% 0cm 6.6° 8.2°C 0.19mm 0.02kPa 18880m 4.6m/s 2.2m/s
08:00
0% 8.2°C 0.03mm 98% 0cm 17° 8.5°C 0.19mm 0.02kPa 21363m 5.3m/s 2.2m/s
09:00
0% 8.4°C 0.04mm 98% 0cm 26° 8.7°C 0.25mm 0.02kPa 24135m 5.5m/s 2m/s
10:00
0% 8.7°C 0.03mm 97% 0cm 36° 9.1°C 0.31mm 0.04kPa 24134m 5.6m/s 2.2m/s
11:00
0% 8.7°C 0.02mm 97% 0cm 45° 9.2°C 0.31mm 0.04kPa 20349m 5m/s 2.3m/s
12:00
0% 8.8°C 0.04mm 96% 0cm 51° 9.4°C 0.06mm 0.05kPa 24134m 4.5m/s 2.3m/s
13:00
1% 8.8°C 0.02mm 96% 0cm 54° 9.5°C 0.19mm 0.05kPa 24134m 3.8m/s 2.3m/s
14:00
1% 8.8°C 0.01mm 94% 0cm 53° 9.8°C 0.25mm 0.07kPa 24135m 3.3m/s 2.2m/s
15:00
1% 8.6°C 0mm 92% 0cm 48° 9.9°C 0.31mm 0.1kPa 24135m 3.5m/s 2.3m/s
16:00
2% 8.1°C 0mm 87% 0cm 41° 10°C 0.38mm 0.16kPa 24135m 3.2m/s 2.1m/s
17:00
2% 7.4°C 0mm 83% 0cm 32° 10°C 0.38mm 0.21kPa 24134m 2.8m/s 1.9m/s
18:00
10% 7°C 0mm 80% 0cm 22° 10°C 0mm 0.25kPa 24135m 3m/s 2m/s
19:00
17% 6.7°C 0mm 83% 0cm 12° 9.4°C 0mm 0.2kPa 24135m 3.4m/s 2.1m/s
20:00
25% 6.3°C 0mm 87% 0cm 2.3° 8.3°C 0mm 0.14kPa 24135m 3.6m/s 1.6m/s
21:00
31% 5.9°C 0mm 91% 0cm -7.2° 7.3°C 0mm 0.09kPa 24135m 2.7m/s 1.6m/s
22:00
37% 5.7°C 0mm 94% 0cm -16° 6.6°C 0mm 0.06kPa 24135m 2.1m/s 1.3m/s
23:00
43% 5.2°C 0mm 96% 0cm -22° 5.7°C 0mm 0.03kPa 24135m 2.3m/s 1.7m/s
Thu, Apr 23 Sunrise 06:13 Sunset 20:19
24:00
52% 4.6°C 0mm 96% 0cm -27° 5.1°C 0mm 0.03kPa 24135m 2.3m/s 1.6m/s
01:00
60% 4.2°C 0mm 96% 0cm -29° 4.8°C 0mm 0.03kPa 24134m 2.3m/s 1.7m/s
02:00
69% 3.8°C 0mm 96% 0cm -29° 4.5°C 0mm 0.04kPa 24135m 2m/s 1.7m/s
03:00
68% 3.5°C 0mm 95% 0cm -25° 4.2°C 0mm 0.04kPa 24135m 1.5m/s 1.5m/s
04:00
67% 3.4°C 0mm 95% 0cm -19° 4°C 0mm 0.04kPa 24135m 1.5m/s 1.5m/s
05:00
66% 3.3°C 0mm 95% 0cm -12° 4°C 0mm 0.04kPa 24134m 1.8m/s 1.7m/s
06:00
64% 3.3°C 0mm 96% 0cm -2.7° 4°C 0mm 0.04kPa 24135m 1.7m/s 1.7m/s
07:00
63% 3.8°C 0mm 93% 0cm 6.9° 4.8°C 0mm 0.06kPa 24135m 1.7m/s 1.5m/s
08:00
61% 5°C 0mm 84% 0cm 17° 7.6°C 0mm 0.17kPa 24134m 2.5m/s 1.2m/s
09:00
58% 5.2°C 0mm 72% 0cm 27° 10°C 0mm 0.35kPa 24135m 2.4m/s 1.7m/s
10:00
54% 5.4°C 0mm 65% 0cm 36° 12°C 0mm 0.48kPa 24134m 2.1m/s 1.9m/s
11:00
51% 5.8°C 0mm 64% 0cm 45° 13°C 0mm 0.52kPa 24134m 2.2m/s 1.9m/s
12:00
38% 5.8°C 0mm 67% 0cm 51° 12°C 0mm 0.46kPa 24134m 1.8m/s 2.2m/s
13:00
26% 5.9°C 0mm 72% 0cm 55° 11°C 0mm 0.35kPa 24134m 3m/s 2.7m/s
14:00
13% 6°C 0mm 71% 0cm 54° 11°C 0mm 0.37kPa 24134m 2.8m/s 2.6m/s
15:00
13% 6.3°C 0mm 67% 0cm 49° 12°C 0mm 0.47kPa 24135m 1.6m/s 2m/s
16:00
14% 6.4°C 0mm 69% 0cm 41° 12°C 0mm 0.43kPa 24135m 1.3m/s 1.8m/s
17:00
14% 6.5°C 0mm 70% 0cm 32° 12°C 0mm 0.41kPa 24135m 1.2m/s 1.9m/s
18:00
32% 5.8°C 0mm 79% 0cm 22° 9.3°C 0mm 0.25kPa 24135m 1.1m/s 1.6m/s
19:00
50% 4.8°C 0mm 87% 0cm 12° 6.9°C 0mm 0.13kPa 24135m 1.1m/s 1.4m/s
20:00
68% 3.7°C 0mm 95% 0cm 2.5° 4.5°C 0mm 0.04kPa 24135m 1m/s 1.1m/s
21:00
75% 3.7°C 0mm 95% 0cm -6.9° 4.5°C 0mm 0.04kPa 24135m 1.1m/s 1.2m/s
22:00
81% 3.7°C 0mm 95% 0cm -15° 4.4°C 0mm 0.04kPa 24135m 1.2m/s 1.3m/s
23:00
88% 3.7°C 0mm 95% 0cm -22° 4.4°C 0mm 0.04kPa 24135m 1.2m/s 1.4m/s
Fri, Apr 24 Sunrise 06:11 Sunset 20:20
24:00
91% 4.2°C 0mm 90% 0cm -27° 5.7°C 0mm 0.09kPa 24135m 1.4m/s 1.3m/s
01:00
94% 4.8°C 0mm 86% 0cm -29° 6.9°C 0mm 0.14kPa 24135m 1.6m/s 1.2m/s
02:00
97% 5.3°C 0mm 82% 0cm -28° 8.2°C 0mm 0.2kPa 24135m 1.8m/s 1.1m/s
03:00
98% 5.8°C 0mm 73% 0cm -25° 10°C 0mm 0.35kPa 24135m 2.1m/s 1.1m/s
04:00
98% 6°C 0mm 64% 0cm -19° 13°C 0mm 0.53kPa 24135m 2.5m/s 1.2m/s
05:00
99% 5.9°C 0mm 55% 0cm -11° 15°C 0mm 0.77kPa 24135m 2.8m/s 1.3m/s
06:00
96% 5.7°C 0mm 52% 0cm -2.4° 16°C 0mm 0.85kPa 24135m 3.3m/s 1.7m/s
07:00
94% 5.4°C 0mm 49% 0cm 7.1° 16°C 0mm 0.94kPa 24135m 3.7m/s 2.1m/s
08:00
91% 5.1°C 0mm 46% 0cm 17° 17°C 0mm 1kPa 24135m 4.1m/s 2.5m/s
09:00
92% 4.4°C 0mm 43% 0cm 27° 17°C 0mm 1.1kPa 24135m 4.4m/s 2.8m/s
10:00
92% 3.6°C 0mm 41% 0cm 37° 17°C 0mm 1.1kPa 24135m 4.8m/s 3.1m/s
11:00
93% 2.8°C 0mm 38% 0cm 45° 17°C 0mm 1.2kPa 24135m 5.1m/s 3.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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