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Rule Fog Hunter

Columbia River Gorge - Fog Hunter - Pacific Northwest

Cascade Locks, Oregon, United States

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread0.1°C
Visibility835 (Fog)
Relative Humidity100%
Wind Speed1.3m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Los_Angeles
Next opportunity
Dense Fog (lingering)
Columbia River Gorge
Today · 23:00–24:00 · 1h window
High confidence
83%
🌫️Fog Probability100%
Dewpoint Spread: 0.1°C
Visibility: 835 (Fog)
Relative Humidity: 100%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Dense Fog (lingering)
Columbia River Gorge
Mon, Feb 9 · 05:00–06:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog (lingering)
Columbia River Gorge
Mon, Feb 16 · 22:00–23:00
🌫️Fog Probability:100%
Medium

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
2matching hours in the next 72 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Los_Angeles
Fog Probability
≥ 85.0%
Dewpoint Spread
≤ 2.0°C
Visibility
≤ 3000.0m
Wind Speed
≤ 2.0m/s
Sat, Feb 7
22:000%0.3°C5252m1.5m/s
23:00100%0.1°C835m1.3m/s
Sun, Feb 8
24:0060%0.2°C784m1.4m/s
01:0060%0.1°C715m1.2m/s
02:0054%0.2°C1797m1.4m/s
03:0032%0.7°C24134m1.1m/s
04:000%0.5°C24134m0.78m/s
05:0067%0.5°C24134m1.1m/s
06:0064%0.5°C24134m0.83m/s
07:0067%0.5°C24135m0.33m/s
08:0067%0.5°C24134m0.48m/s
09:0060%0.7°C24134m0.56m/s
10:0053%1°C24135m1.2m/s
11:000%2.2°C24135m1.1m/s
12:000%2.1°C24134m1.6m/s
13:000%2°C21471m1.7m/s
14:000%1.3°C13187m1.6m/s
15:000%1.1°C15621m1.9m/s
16:000%1.6°C23596m2.1m/s
17:0030%0.9°C24134m1.9m/s
18:000%0.1°C4166m1.9m/s
19:000%0.2°C944m1.8m/s
20:000%0.4°C3770m2.1m/s
21:000%0.2°C256m2.1m/s
22:000%0.1°C91m1.9m/s
23:000%0.1°C45m1.2m/s
Mon, Feb 9
24:000%0°C69m1.3m/s
01:000%0.2°C125m1.3m/s
02:000%0.1°C290m1.4m/s
03:000%0.3°C1072m1.7m/s
04:000%0.2°C1486m1.8m/s
05:00100%0°C1008m1.9m/s
06:00100%0.2°C1015m2.1m/s
07:0063%0.2°C57m1.9m/s
08:0063%0.1°C36m1.7m/s
09:000%0.4°C193m2m/s
10:000%0.2°C71m1.1m/s
11:0048%0.8°C22186m1.1m/s
12:000%2°C22212m1.9m/s
13:000%1.6°C10225m1.6m/s
14:000%2.9°C20002m1.4m/s
15:000%3.2°C14617m1.1m/s
16:000%2.4°C24134m0.91m/s
17:000%1.7°C24134m0.7m/s
18:000%1.1°C24135m1m/s
19:0060%0.9°C24134m1.2m/s
20:0060%0.9°C24135m1.2m/s
21:0060%0.9°C24134m1.4m/s
22:0060%0.8°C24135m1.7m/s
23:0060%0.8°C24134m2m/s
Tue, Feb 10
24:0060%0.7°C24135m2.1m/s
01:0064%0.7°C24135m2.3m/s
02:0064%0.7°C24135m2.3m/s
03:0064%0.7°C24134m2.5m/s
04:0060%0.7°C24134m2.7m/s
05:000%1.3°C24134m3.1m/s
06:000%2.1°C24135m3.5m/s
07:000%2.8°C24135m3.9m/s
08:000%2.5°C24135m4m/s
09:000%2.3°C24135m4.1m/s
10:000%2°C24135m4.1m/s
11:000%1.8°C24135m4m/s
12:000%1.5°C24135m3.9m/s
13:000%1.2°C24135m3.8m/s
14:000%1.3°C24135m3.6m/s
15:000%1.3°C24135m3.5m/s
16:000%1.4°C24135m3.3m/s
17:000%1.3°C24135m3.2m/s
18:000%1.3°C24135m3.2m/s
19:000%1.3°C24135m3.2m/s
20:000%1.3°C24135m3.1m/s
21:000%1.3°C24135m3m/s
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
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Wind Gusts
m/s
Sat, Feb 7 Sunrise 07:19 Sunset 17:22
23:00
5.6°C 0mm 100% 0cm 5.7°C 0.19mm 0kPa 1.8m/s
Sun, Feb 8 Sunrise 07:19 Sunset 17:22
24:00
6.1°C 0.02mm 99% 0cm 6.3°C 0.31mm 0.01kPa 2.6m/s
01:00
6.3°C 0.34mm 99% 0cm 6.4°C 0.5mm 0.01kPa 2.5m/s
02:00
6°C 0mm 99% 0cm 6.2°C 0.88mm 0.01kPa 2.1m/s
03:00
5.2°C 0.01mm 96% 0cm 5.9°C 0.94mm 0.04kPa 1m/s
04:00
4.9°C 0mm 96% 0cm 5.4°C 1mm 0.04kPa 0.81m/s
05:00
4.8°C 0.02mm 97% 0cm 5.3°C 0mm 0.03kPa 1m/s
06:00
4.8°C 0.06mm 96% 0cm 5.3°C 0.06mm 0.03kPa 0.8m/s
07:00
4.5°C 0.01mm 97% 0cm 5°C 0.13mm 0.03kPa 0.41m/s
08:00
4.6°C 0mm 97% 0cm 5.1°C 0.13mm 0.03kPa 0.5m/s
09:00
5.3°C 0mm 95% 0cm 6°C 0.13mm 0.05kPa 0.9m/s
10:00
5.6°C 0mm 93% 0cm 6.6°C 0.13mm 0.06kPa 2.2m/s
11:00
5.2°C 0mm 86% 0cm 7.4°C 0mm 0.14kPa 2m/s
12:00
5.4°C 0.01mm 87% 0cm 7.5°C 0.06mm 0.14kPa 2.8m/s
13:00
5.3°C 0.19mm 87% 0cm 7.3°C 0.19mm 0.13kPa 3.1m/s
14:00
5.7°C 0.27mm 92% 0cm 7°C 0.63mm 0.08kPa 3.1m/s
15:00
5.5°C 0.02mm 93% 0cm 6.6°C 0.94mm 0.07kPa 3.7m/s
16:00
4.8°C 0.01mm 90% 0cm 6.4°C 1.3mm 0.1kPa 4.3m/s
17:00
4.4°C 0.01mm 94% 0cm 5.3°C 0.25mm 0.05kPa 2.9m/s
18:00
4.4°C 1mm 99% 0cm 4.5°C 0.69mm 0.01kPa 3.2m/s
19:00
4.8°C 0.67mm 99% 0cm 5°C 1.8mm 0.01kPa 3.3m/s
20:00
4.3°C 1.4mm 98% 0cm 4.7°C 2.9mm 0.02kPa 5.5m/s
21:00
3.3°C 2.4mm 98% 0cm 3.5°C 4.9mm 0.01kPa 5.6m/s
22:00
2°C 3.7mm 100% 3.7cm 2.1°C 8.1mm 0kPa 3.6m/s
23:00
1.3°C 0.9mm 99% 0.9cm 1.4°C 2.4mm 0kPa 2.3m/s
Mon, Feb 9 Sunrise 07:18 Sunset 17:24
24:00
2°C 0.01mm 99% 0cm 2°C 2.7mm 0kPa 2.7m/s
01:00
2.3°C 0mm 99% 0cm 2.5°C 2.7mm 0.01kPa 2.5m/s
02:00
2.5°C 0mm 99% 0cm 2.6°C 2.7mm 0.01kPa 2.9m/s
03:00
2.6°C 0.01mm 98% 0cm 2.9°C 2.7mm 0.01kPa 3.5m/s
04:00
2.5°C 0mm 99% 0cm 2.7°C 2.8mm 0.01kPa 3.6m/s
05:00
2.1°C 0.01mm 99% 0cm 2.1°C 0.13mm 0kPa 3.4m/s
06:00
2.7°C 0mm 98% 0cm 2.9°C 0.19mm 0.01kPa 4.9m/s
07:00
2.2°C 0.22mm 98% 0.26cm 2.4°C 0.31mm 0.01kPa 4.1m/s
08:00
2.4°C 0.34mm 99% 0cm 2.5°C 0.75mm 0.01kPa 3.3m/s
09:00
2.2°C 0.53mm 97% 0cm 2.6°C 1.1mm 0.02kPa 5.8m/s
10:00
2.7°C 0.03mm 99% 0cm 2.9°C 1.4mm 0.01kPa 3.8m/s
11:00
2.8°C 0mm 95% 0cm 3.6°C 0.13mm 0.04kPa 2.8m/s
12:00
2.5°C 0mm 87% 0cm 4.5°C 0.19mm 0.11kPa 4m/s
13:00
2.9°C 0mm 90% 0cm 4.5°C 0.31mm 0.09kPa 3.8m/s
14:00
2.4°C 0mm 81% 0cm 5.3°C 0.38mm 0.17kPa 2.7m/s
15:00
2.3°C 0mm 80% 0cm 5.5°C 0.38mm 0.18kPa 1.9m/s
16:00
2.8°C 0mm 84% 0cm 5.2°C 0.44mm 0.14kPa 1.4m/s
17:00
2°C 0mm 89% 0cm 3.7°C 0mm 0.09kPa 0.7m/s
18:00
0.9°C 0mm 92% 0cm 2°C 0mm 0.05kPa 0.9m/s
19:00
0.3°C 0mm 94% 0cm 1.2°C 0mm 0.04kPa 1m/s
20:00
-0.3°C 0mm 94% 0cm 0.57°C 0mm 0.04kPa 1m/s
21:00
-0.8°C 0mm 94% 0cm 0.1°C 0mm 0.04kPa 1.1m/s
22:00
-1.2°C 0mm 94% 0cm -0.36°C 0mm 0.04kPa 1.4m/s
23:00
-1.6°C 0mm 94% 0cm -0.78°C 0mm 0.03kPa 1.6m/s
Tue, Feb 10 Sunrise 07:17 Sunset 17:25
24:00
-1.5°C 0mm 95% 0cm -0.79°C 0mm 0.03kPa 2.5m/s
01:00
-1.5°C 0mm 95% 0cm -0.77°C 0mm 0.03kPa 2.6m/s
02:00
-1.3°C 0mm 95% 0cm -0.63°C 0mm 0.03kPa 3.2m/s
03:00
-1.4°C 0mm 95% 0cm -0.71°C 0mm 0.03kPa 3.6m/s
04:00
-1.4°C 0mm 95% 0cm -0.71°C 0mm 0.03kPa 4.1m/s
05:00
-0.1°C 0mm 91% 0cm 1.2°C 0mm 0.06kPa 4.9m/s
06:00
1.1°C 0mm 86% 0cm 3.2°C 0mm 0.1kPa 5.7m/s
07:00
2.3°C 0mm 82% 0cm 5.1°C 0mm 0.16kPa 6.5m/s
08:00
2°C 0mm 84% 0cm 4.5°C 0mm 0.14kPa 6.7m/s
09:00
1.6°C 0mm 85% 0cm 3.9°C 0mm 0.12kPa 6.9m/s
10:00
1.3°C 0mm 86% 0cm 3.3°C 0mm 0.11kPa 7.1m/s
11:00
0.5°C 0mm 88% 0cm 2.3°C 0mm 0.09kPa 6.9m/s
12:00
-0.2°C 0mm 90% 0cm 1.3°C 0mm 0.07kPa 6.6m/s
13:00
-0.9°C 0mm 92% 0cm 0.29°C 0mm 0.05kPa 6.4m/s
14:00
-1.1°C 0mm 91% 0cm 0.2°C 0mm 0.05kPa 6.2m/s
15:00
-1.2°C 0mm 91% 0cm 0.1°C 0mm 0.06kPa 5.9m/s
16:00
-1.4°C 0mm 90% 0cm 0.005°C 0mm 0.06kPa 5.7m/s
17:00
-1.4°C 0mm 91% 0cm -0.1°C 0mm 0.06kPa 5.5m/s
18:00
-1.5°C 0mm 91% 0cm -0.2°C 0mm 0.06kPa 5.4m/s
19:00
-1.6°C 0mm 91% 0cm -0.3°C 0mm 0.05kPa 5.2m/s
20:00
-1.6°C 0mm 91% 0cm -0.34°C 0mm 0.05kPa 5m/s
21:00
-1.7°C 0mm 91% 0cm -0.39°C 0mm 0.05kPa 4.8m/s
22:00
-1.7°C 0mm 91% 0cm -0.43°C 0mm 0.05kPa 4.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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