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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 Spread3.7°C
Visibility24135 (Clear)
Relative Humidity76%
Wind Speed1.4m/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
Columbia River Gorge
Tue, Mar 17 · 24:00–01:00 · 1h window
Medium confidence
42%
🌫️Fog Probability63.9%
Dewpoint Spread: 0.7°C
Visibility: 24135 (Clear)
Relative Humidity: 95%
Wind Speed: 1.6m/s (calm conditions)
fog weather icon
Moderate Fog
Columbia River Gorge
Fri, Mar 20 · 21:00–22:00
🌫️Fog Probability:62.5%
Low
fog weather icon
Moderate Fog
Columbia River Gorge
Sat, Mar 21 · 18:00–24:00
🌫️Fog Probability:63.9-66.7%
Low

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
1matching hours in the next 80 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Los_Angeles
Fog Probability
≥ 60.0%
Sat, Mar 14
21:000%
22:000%
23:000%
Sun, Mar 15
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%
Mon, Mar 16
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%
20:0060%
21:0060%
22:0060%
23:0060%
Tue, Mar 17
24:0064%
01:0060%
02:000%
03:000%
04:000%
05:0030%
06:0030%
07:0030%
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%
Wed, Mar 18
24:000%
01:000%
02:000%
03:000%
04:000%
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
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
Sun, Mar 15 Sunrise 07:20 Sunset 19:12
06:00
-3.2°C 0mm 76% 0cm 0.45°C 0mm 0.15kPa 24135m 2.2m/s 1.4m/s
07:00
-2.8°C 0mm 79% 0cm 0.36°C 0mm 0.13kPa 24135m 2.8m/s 1.7m/s
08:00
-2.5°C 0.01mm 80% 0cm 0.54°C 0mm 0.13kPa 24135m 3m/s 1.9m/s
09:00
-2.5°C 0.02mm 78% 0.02cm 0.98°C 0mm 0.15kPa 24134m 3.3m/s 2.3m/s
10:00
-2.3°C 0.02mm 75% 0cm 1.7°C 0.06mm 0.17kPa 24134m 3.4m/s 2.4m/s
11:00
-1.9°C 0mm 74% 0cm 2.2°C 0.06mm 0.19kPa 24134m 3m/s 2.2m/s
12:00
-1.5°C 0.01mm 73% 0cm 2.9°C 0mm 0.2kPa 24134m 3m/s 2.3m/s
13:00
-0.7°C 0.07mm 76% 0.07cm 3°C 0.06mm 0.18kPa 24135m 2.6m/s 1.9m/s
14:00
-0.1°C 0.05mm 80% 0cm 3°C 0.06mm 0.15kPa 24134m 2.2m/s 1.6m/s
15:00
0.2°C 0.01mm 81% 0cm 3.1°C 0.13mm 0.14kPa 24135m 1.7m/s 1.2m/s
16:00
0.3°C 0.03mm 78% 0cm 3.7°C 0.13mm 0.17kPa 24135m 1.3m/s 0.82m/s
17:00
0.9°C 0.97mm 81% 0cm 4°C 0.31mm 0.16kPa 13555m 2.2m/s 0.91m/s
18:00
1.4°C 0.18mm 88% 0cm 3.1°C 0.44mm 0.09kPa 23880m 1.7m/s 1.5m/s
19:00
1.2°C 0mm 90% 0cm 2.7°C 0.63mm 0.08kPa 24134m 0.81m/s 0.88m/s
20:00
1.2°C 0mm 89% 0cm 2.9°C 0.63mm 0.09kPa 24135m 1.1m/s 1.3m/s
21:00
1.1°C 0mm 86% 0cm 3.3°C 0.63mm 0.11kPa 24135m 0.9m/s 1.1m/s
22:00
1.1°C 0mm 84% 0cm 3.6°C 0.63mm 0.13kPa 24134m 0.9m/s 0.94m/s
23:00
1°C 0mm 82% 0cm 3.9°C 0.63mm 0.15kPa 24135m 1.2m/s 1.3m/s
Mon, Mar 16 Sunrise 07:18 Sunset 19:13
24:00
0.9°C 0mm 80% 0cm 4.1°C 0mm 0.16kPa 24134m 1.2m/s 1.3m/s
01:00
0.9°C 0mm 78% 0cm 4.4°C 0mm 0.18kPa 24134m 1.3m/s 1.5m/s
02:00
0.5°C 0mm 78% 0cm 4.1°C 0mm 0.18kPa 24135m 1.6m/s 1.7m/s
03:00
0.4°C 0mm 77% 0cm 4.1°C 0mm 0.19kPa 24135m 1.5m/s 1.7m/s
04:00
-0.4°C 0mm 78% 0cm 3.2°C 0mm 0.17kPa 24134m 1.7m/s 1.9m/s
05:00
-0.2°C 0mm 78% 0cm 3.3°C 0mm 0.17kPa 24134m 1.8m/s 2.1m/s
06:00
0.7°C 0.17mm 76% 0cm 4.5°C 0mm 0.2kPa 23973m 2.4m/s 2m/s
07:00
1.8°C 0.02mm 85% 0cm 4.1°C 0.38mm 0.12kPa 24135m 0.9m/s 0.99m/s
08:00
2.2°C 0mm 86% 0cm 4.4°C 0.38mm 0.12kPa 24134m 2.2m/s 1.8m/s
09:00
3.2°C 0.29mm 89% 0cm 4.9°C 0.56mm 0.09kPa 23771m 2m/s 1.6m/s
10:00
4.4°C 0.11mm 93% 0cm 5.4°C 1.1mm 0.06kPa 24135m 1m/s 1m/s
11:00
5.9°C 0.01mm 90% 0cm 7.5°C 1.1mm 0.1kPa 24134m 2.1m/s 1.4m/s
12:00
7.1°C 0mm 88% 0cm 8.9°C 0mm 0.14kPa 24134m 3m/s 1.6m/s
13:00
6.7°C 0mm 63% 0cm 14°C 0mm 0.57kPa 24135m 7.7m/s 2.5m/s
14:00
5.2°C 0mm 53% 0cm 15°C 0mm 0.77kPa 24134m 8.5m/s 3.4m/s
15:00
5.2°C 0mm 54% 0cm 15°C 0mm 0.77kPa 24135m 8.4m/s 3.1m/s
16:00
5.3°C 0mm 55% 0cm 14°C 0mm 0.72kPa 24134m 7.9m/s 3m/s
17:00
6°C 0mm 60% 0cm 13°C 0mm 0.61kPa 24135m 6.9m/s 2.4m/s
18:00
7.6°C 0mm 75% 0cm 12°C 0mm 0.35kPa 24134m 2.7m/s 1.7m/s
19:00
7.3°C 0mm 92% 0cm 8.5°C 0mm 0.09kPa 24135m 1.3m/s 1.5m/s
20:00
6.1°C 0mm 94% 0cm 7°C 0mm 0.06kPa 24134m 1.2m/s 1.3m/s
21:00
5.6°C 0mm 94% 0cm 6.5°C 0mm 0.06kPa 24135m 1.1m/s 1.1m/s
22:00
5.6°C 0mm 94% 0cm 6.4°C 0mm 0.06kPa 24135m 1.2m/s 1.3m/s
23:00
5.7°C 0mm 94% 0cm 6.5°C 0mm 0.05kPa 24135m 1.1m/s 1.3m/s
Tue, Mar 17 Sunrise 07:16 Sunset 19:14
24:00
6°C 0mm 95% 0cm 6.7°C 0mm 0.05kPa 24135m 1.4m/s 1.6m/s
01:00
6°C 0mm 95% 0cm 6.7°C 0mm 0.05kPa 24135m 1.6m/s 1.8m/s
02:00
6.7°C 0mm 89% 0cm 8.3°C 0mm 0.12kPa 24134m 3.4m/s 2.2m/s
03:00
6.5°C 0.28mm 90% 0cm 8.1°C 0.13mm 0.11kPa 18292m 3m/s 1.8m/s
04:00
6.5°C 0mm 90% 0cm 8°C 0.19mm 0.11kPa 24134m 3m/s 2m/s
05:00
6.6°C 0.35mm 94% 0cm 7.5°C 0.69mm 0.06kPa 23433m 2.7m/s 1.6m/s
06:00
6.4°C 0.32mm 94% 0cm 7.3°C 0.31mm 0.06kPa 23836m 1m/s 0.99m/s
07:00
6.2°C 0.58mm 94% 0cm 7.1°C 0.63mm 0.06kPa 23237m 1.2m/s 1.4m/s
08:00
6.3°C 0.27mm 95% 0cm 7°C 1mm 0.05kPa 23521m 3.5m/s 2m/s
09:00
6.5°C 1.4mm 97% 0cm 7°C 2.2mm 0.03kPa 9637m 2m/s 1.3m/s
10:00
6.8°C 2.5mm 98% 0cm 7.2°C 3.8mm 0.03kPa 6603m 1.7m/s 0.92m/s
11:00
6.9°C 1.6mm 98% 0cm 7.2°C 5.8mm 0.02kPa 8523m 2.9m/s 1m/s
12:00
5.8°C 1.1mm 90% 0cm 7.3°C 3.9mm 0.1kPa 13727m 2.4m/s 1.2m/s
13:00
4.6°C 0.54mm 82% 0cm 7.5°C 1.9mm 0.19kPa 18931m 1.8m/s 1.3m/s
14:00
3.3°C 0mm 74% 0cm 7.6°C 0mm 0.27kPa 24135m 1.3m/s 1.5m/s
15:00
3.1°C 0mm 73% 0cm 7.6°C 0mm 0.28kPa 24135m 1.3m/s 1.6m/s
16:00
2.9°C 0mm 73% 0cm 7.5°C 0mm 0.28kPa 24135m 1.4m/s 1.6m/s
17:00
2.7°C 0mm 72% 0cm 7.4°C 0mm 0.29kPa 24135m 1.4m/s 1.7m/s
18:00
2.6°C 0mm 73% 0cm 7.1°C 0mm 0.28kPa 24135m 1.4m/s 1.7m/s
19:00
2.4°C 0mm 73% 0cm 6.9°C 0mm 0.26kPa 24135m 1.5m/s 1.7m/s
20:00
2.3°C 0mm 74% 0cm 6.6°C 0mm 0.25kPa 24135m 1.5m/s 1.7m/s
21:00
2°C 0mm 73% 0cm 6.6°C 0mm 0.27kPa 24135m 1.6m/s 1.8m/s
22:00
1.7°C 0mm 71% 0cm 6.5°C 0mm 0.28kPa 24135m 1.6m/s 1.9m/s
23:00
1.4°C 0mm 70% 0cm 6.5°C 0mm 0.29kPa 24135m 1.6m/s 2m/s
Wed, Mar 18 Sunrise 07:14 Sunset 19:16
24:00
1.3°C 0mm 68% 0cm 6.7°C 0mm 0.31kPa 24135m 1.5m/s 1.8m/s
01:00
1.1°C 0mm 67% 0cm 6.8°C 0mm 0.33kPa 24135m 1.4m/s 1.6m/s
02:00
0.9°C 0mm 65% 0cm 7°C 0mm 0.35kPa 24135m 1.2m/s 1.4m/s
03:00
1.4°C 0mm 59% 0cm 9°C 0mm 0.47kPa 24135m 1.9m/s 1.4m/s
04:00
1.7°C 0mm 53% 0cm 11°C 0mm 0.62kPa 24135m 2.5m/s 1.5m/s
05:00
1.9°C 0mm 47% 0cm 13°C 0mm 0.8kPa 24135m 3.2m/s 1.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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