What conditions does Fog Hunter look for?

Fog Probability: ≥ 85.0%. Dewpoint Spread: ≤ 2.0°C. Visibility: ≤ 3000.0m. Wind Speed: ≤ 2.0m/s

How often do conditions match?

There are 5 upcoming opportunity windows in the next 10 days.

More Fog Hunter in Canadian Rockies

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Rule Fog Hunter

Invermere - Fog Hunter - Canadian Rockies

Invermere, British Columbia, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions

Fog Probability

60%

Dewpoint Spread0.7°C

Visibility24134 (Clear)

Relative Humidity94%

Wind Speed2.4m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Edmonton

Next opportunity

Dense Fog (lingering)

Invermere

Today · 20:00–21:00 · 1h window

Medium confidence

69%

🌫️Fog Probability100%

Dewpoint Spread: 0.4°C

Visibility: 1443 (Mist/Haze)

Relative Humidity: 97%

Wind Speed: 2.0m/s (calm conditions)

Dense Fog (lingering)

Invermere

Today · 22:00–23:00

🌫️Fog Probability:94.4%

Medium

Dense Fog (lingering)

Invermere

Tomorrow · 24:00–01:00

🌫️Fog Probability:94.4%

Medium

Dense Fog (lingering)

Invermere

Tomorrow · 06:00–07:00

🌫️Fog Probability:100%

High

Dense Fog (lingering)

Invermere

Sat, Feb 28 · 02:00–03:00

🌫️Fog Probability:87.5%

Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the temperature inversions and fog conditions that create some of the most dramatic mountain photography in North America. We combine atmospheric data with local topography to predict when Bow Valley inversions will trap fog below while peaks glow above.

The Canadian Rockies are famous for their autumn morning fog, particularly in the Bow Valley corridor between Banff and Lake Louise. Cold mountain air settles into valleys overnight, creating thick fog layers that can persist until mid-morning, especially in September and October.

What makes Rockies fog photography exceptional:

Bow Valley inversions - Temperature inversions create sea-of-fog conditions with peaks emerging above the cloud layer
Glacier lake mist - Moraine Lake and Lake Louise develop ethereal mist at dawn when water temperatures meet cold air
Castle Junction phenomena - Junction areas where valleys meet create reliable fog formation zones
Autumn intensity - September through October brings the most dramatic and frequent fog events

Best shooting occurs at elevated viewpoints like Tunnel Mountain or Sulphur Mountain during inversions, or directly at lake level during misty conditions. Our forecast identifies when these different fog types will occur.

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72-hour requirements breakdown

What passed or failed, hour by hour

4matching hours in the next 95 hoursJump to next match

AND logic: all conditions required

Meets requirement

Misses requirement

Time America/Edmonton	Fog Probability ≥ 85.0%	Dewpoint Spread ≤ 2.0°C	Visibility ≤ 3000.0m	Wind Speed ≤ 2.0m/s
Sat, Feb 21
18:00	0%	2°C	24135m	2.2m/s
19:00	0%	1.4°C	16145m	1.6m/s
20:00	0%	1.3°C	17207m	1.1m/s
21:00	0%	1.3°C	22386m	1m/s
22:00	0%	1.5°C	19490m	0.99m/s
23:00	0%	1.5°C	19795m	0.75m/s
Sun, Feb 22
24:00	0%	1.4°C	15744m	0.61m/s
01:00	0%	1.4°C	16650m	0.64m/s
02:00	0%	1.5°C	19106m	0.82m/s
03:00	0%	1.4°C	18319m	0.77m/s
04:00	0%	1.3°C	15907m	0.7m/s
05:00	0%	1.2°C	16284m	0.6m/s
06:00	83%	0.4°C	9831m	0.62m/s
07:00	83%	0.3°C	9982m	0.71m/s
08:00	75%	0.3°C	11356m	0.65m/s
09:00	0%	1.2°C	21808m	1.2m/s
10:00	0%	1.6°C	24135m	1.7m/s
11:00	0%	2.2°C	24135m	1.8m/s
12:00	0%	2.7°C	24135m	2.1m/s
13:00	0%	3°C	24135m	2.5m/s
14:00	0%	3°C	24134m	2.3m/s
15:00	0%	2.8°C	24134m	2.8m/s
16:00	0%	2.6°C	24135m	2.8m/s
17:00	0%	1.5°C	20615m	2.5m/s
18:00	60%	0.7°C	24134m	2.4m/s
19:00	67%	0.5°C	17886m	2.1m/s
20:00	100%	0.4°C	1443m	2m/s
21:00	100%	0.5°C	977m	2.3m/s
22:00	94%	0.4°C	2730m	1.8m/s
23:00	94%	0.3°C	4709m	1.7m/s
Mon, Feb 23
24:00	94%	0.3°C	2450m	1.6m/s
01:00	94%	0.5°C	4416m	2m/s
02:00	94%	0.5°C	4301m	2.3m/s
03:00	94%	0.5°C	4818m	1.9m/s
04:00	94%	0.5°C	4574m	1.8m/s
05:00	94%	0.5°C	3118m	1.7m/s
06:00	100%	0.4°C	1478m	1.3m/s
07:00	58%	0.4°C	185m	1.9m/s
08:00	47%	0.4°C	2095m	2m/s
09:00	58%	0.5°C	650m	2.4m/s
10:00	48%	0.9°C	364m	2.3m/s
11:00	0%	0.7°C	255m	2.5m/s
12:00	82%	0.5°C	1179m	2.7m/s
13:00	47%	0.3°C	373m	2.4m/s
14:00	39%	0.1°C	2134m	2.9m/s
15:00	55%	0.1°C	98m	3.2m/s
16:00	0%	0°C	41m	2.3m/s
17:00	0%	0.1°C	40m	2.6m/s
18:00	63%	0.2°C	55m	2.6m/s
19:00	60%	0.3°C	113m	2.5m/s
20:00	58%	0.3°C	225m	2.2m/s
21:00	0%	0.4°C	1934m	1.9m/s
22:00	0%	0.4°C	9607m	1m/s
23:00	0%	0.3°C	529m	0.88m/s
Tue, Feb 24
24:00	72%	0.6°C	14931m	1.5m/s
01:00	64%	0.7°C	23095m	0.78m/s
02:00	67%	0.5°C	17790m	1.2m/s
03:00	64%	0.6°C	22168m	1.3m/s
04:00	60%	0.9°C	22458m	1.1m/s
05:00	64%	0.6°C	22523m	1.1m/s
06:00	67%	0.5°C	16043m	1.2m/s
07:00	67%	0.2°C	15314m	1.2m/s
08:00	75%	0.5°C	13396m	1.1m/s
09:00	0%	1.2°C	14479m	0.94m/s
10:00	0%	1.3°C	14270m	0.93m/s
11:00	0%	1.7°C	19135m	0.83m/s
12:00	0%	1.6°C	24135m	0.75m/s
13:00	0%	1.6°C	24135m	0.58m/s
14:00	0%	1.8°C	24134m	0.83m/s
15:00	0%	2.2°C	20933m	0.77m/s
16:00	0%	2.6°C	20215m	0.47m/s
17:00	0%	2.3°C	24134m	0.3m/s
18:00	60%	0.9°C	24135m	0.45m/s
19:00	60%	0.8°C	24135m	0.57m/s
20:00	60%	0.7°C	22473m	0.37m/s
21:00	72%	0.6°C	13813m	0.66m/s
22:00	60%	0.8°C	15679m	0.68m/s
23:00	72%	0.6°C	14425m	1.2m/s
Wed, Feb 25
24:00	64%	0.6°C	17485m	1m/s
01:00	64%	0.6°C	20546m	0.81m/s
02:00	64%	0.6°C	23606m	0.6m/s
03:00	0%	1.4°C	23782m	0.58m/s
04:00	0%	2.2°C	23959m	0.56m/s
05:00	0%	3.1°C	24135m	0.54m/s
06:00	0%	3°C	19135m	1.2m/s
07:00	0%	2.8°C	14135m	1.8m/s
08:00	0%	2.7°C	9136m	2.4m/s
09:00	0%	2.6°C	9896m	2m/s
10:00	0%	2.6°C	10656m	1.6m/s
11:00	0%	2.6°C	11416m	1.1m/s
12:00	0%	1.9°C	15655m	0.93m/s
13:00	0%	1.4°C	19895m	0.71m/s
14:00	48%	0.9°C	24135m	0.49m/s
15:00	53%	0.8°C	23555m	0.74m/s
16:00	53%	0.8°C	22976m	0.99m/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/Edmonton	Dew Point °C	Rainfall mm	Relative Humidity %	Snowfall cm	Temperature °C	Total Precipitation mm	Vapor Pressure Deficit kPa	Wind Gusts m/s
Sun, Feb 22 Sunrise 07:40 Sunset 18:13
18:00 ☾	-5.5°C	0mm	94%	0cm	-4.8°C	0mm	0.02kPa	4.4m/s
19:00 ☾	-8.1°C	0mm	96%	0cm	-7.6°C	0mm	0.01kPa	3.9m/s
20:00 ☾	-8.4°C	0.03mm	97%	0.03cm	-8°C	0mm	0.01kPa	3.9m/s
21:00 ☾	-5.4°C	0.06mm	96%	0.06cm	-4.9°C	0.19mm	0.02kPa	6.3m/s
22:00 ☾	-6.5°C	0.02mm	97%	0cm	-6.1°C	0.19mm	0.01kPa	2.9m/s
23:00 ☾	-7.1°C	0.01mm	98%	0cm	-6.8°C	0.19mm	0.01kPa	3m/s
Mon, Feb 23 Sunrise 07:40 Sunset 18:13
24:00 ☾	-7.3°C	0.03mm	98%	0cm	-7°C	0mm	0.01kPa	1.8m/s
01:00 ☾	-6°C	0.01mm	97%	0cm	-5.5°C	0.06mm	0.01kPa	4.9m/s
02:00 ☾	-5.9°C	0.01mm	96%	0cm	-5.4°C	0.06mm	0.02kPa	4.9m/s
03:00 ☾	-5.7°C	0.01mm	96%	0cm	-5.2°C	0.06mm	0.01kPa	4.8m/s
04:00 ☾	-5.6°C	0.01mm	96%	0cm	-5.1°C	0.06mm	0.02kPa	3.8m/s
05:00 ☾	-5.3°C	0.01mm	96%	0cm	-4.8°C	0.13mm	0.01kPa	4.4m/s
06:00 ☾	-5.1°C	0.04mm	97%	0cm	-4.7°C	0mm	0.01kPa	3.4m/s
07:00 ☾	-4.8°C	0.25mm	97%	0.25cm	-4.4°C	0.19mm	0.01kPa	4m/s
08:00 ☾	-4.7°C	0.03mm	96%	0cm	-4.3°C	0.38mm	0.02kPa	4.2m/s
09:00 ☾	-4.3°C	0.15mm	96%	0.15cm	-3.8°C	0.44mm	0.02kPa	5.2m/s
10:00 ☾	-3.1°C	0.28mm	94%	0.28cm	-2.2°C	0.56mm	0.03kPa	4.1m/s
11:00 ☾	-2.1°C	0.3mm	95%	0.3cm	-1.4°C	1mm	0.03kPa	4.1m/s
12:00 ☾	-0.9°C	0.08mm	96%	0.09cm	-0.37°C	0.19mm	0.02kPa	3.9m/s
13:00 ☾	-0.3°C	0.61mm	98%	0.62cm	-0.03°C	0.44mm	0.01kPa	4.1m/s
14:00 ☾	0.1°C	0.06mm	99%	0cm	0.24°C	0.75mm	0.01kPa	5.3m/s
15:00 ☾	0.3°C	0.26mm	99%	0.27cm	0.4°C	0.94mm	0.01kPa	6.9m/s
16:00 ☾	0.1°C	1.5mm	100%	1.5cm	0.14°C	1.9mm	0kPa	5.8m/s
17:00 ☾	-0.1°C	0.67mm	99%	0.67cm	0.04°C	3.1mm	0.01kPa	6.3m/s
18:00 ☾	-0.3°C	0.31mm	99%	0.32cm	-0.11°C	0.31mm	0.01kPa	5.6m/s
19:00 ☾	-0.6°C	0.05mm	98%	0.23cm	-0.34°C	0.56mm	0.01kPa	5.9m/s
20:00 ☾	-0.9°C	0.06mm	98%	0.38cm	-0.61°C	0.88mm	0.01kPa	5m/s
21:00 ☾	-1.2°C	0.06mm	97%	0cm	-0.79°C	1.2mm	0.02kPa	4.5m/s
22:00 ☾	-4.5°C	0.06mm	97%	0cm	-4.1°C	1.3mm	0.01kPa	1.6m/s
23:00 ☾	-5.9°C	0.11mm	98%	0.11cm	-5.6°C	1.4mm	0.01kPa	0.92m/s
Tue, Feb 24 Sunrise 07:38 Sunset 18:15
24:00 ☾	-3.7°C	0mm	96%	0cm	-3.1°C	0.13mm	0.02kPa	2.2m/s
01:00 ☾	-7.9°C	0mm	95%	0cm	-7.2°C	0.13mm	0.02kPa	0.8m/s
02:00 ☾	-8.9°C	0mm	96%	0cm	-8.4°C	0.13mm	0.01kPa	1.1m/s
03:00 ☾	-9.5°C	0mm	96%	0cm	-8.9°C	0.13mm	0.01kPa	1.1m/s
04:00 ☾	-9.4°C	0mm	94%	0cm	-8.5°C	0.13mm	0.02kPa	1m/s
05:00 ☾	-10°C	0mm	95%	0cm	-9.7°C	0.13mm	0.01kPa	1m/s
06:00 ☾	-12°C	0mm	97%	0cm	-12°C	0mm	0.01kPa	1.1m/s
07:00 ☾	-13°C	0mm	98%	0cm	-13°C	0mm	0.01kPa	1m/s
08:00 ☾	-14°C	0mm	96%	0cm	-14°C	0mm	0.01kPa	0.92m/s
09:00 ☾	-11°C	0mm	91%	0cm	-9.8°C	0mm	0.03kPa	1.4m/s
10:00 ☾	-8.5°C	0mm	90%	0cm	-7.2°C	0mm	0.03kPa	1.3m/s
11:00 ☾	-6.7°C	0mm	88%	0cm	-5°C	0mm	0.05kPa	1m/s
12:00 ☾	-5.2°C	0mm	89%	0cm	-3.6°C	0mm	0.05kPa	0.72m/s
13:00 ☾	-4.2°C	0mm	89%	0cm	-2.6°C	0mm	0.06kPa	0.22m/s
14:00 ☾	-3.8°C	0mm	87%	0cm	-2°C	0mm	0.07kPa	0.61m/s
15:00 ☾	-3.7°C	0.01mm	85%	0cm	-1.5°C	0mm	0.08kPa	0.72m/s
16:00 ☾	-3.9°C	0.01mm	82%	0cm	-1.3°C	0mm	0.1kPa	0.41m/s
17:00 ☾	-4.1°C	0.01mm	84%	0cm	-1.8°C	0mm	0.08kPa	0.4m/s
18:00 ☾	-6.2°C	0mm	93%	0cm	-5.3°C	0mm	0.03kPa	0.51m/s
19:00 ☾	-9.4°C	0mm	94%	0cm	-8.6°C	0mm	0.02kPa	0.51m/s
20:00 ☾	-11°C	0mm	95%	0cm	-10°C	0mm	0.02kPa	0.61m/s
21:00 ☾	-12°C	0mm	95%	0cm	-11°C	0mm	0.01kPa	0.92m/s
22:00 ☾	-11°C	0mm	94%	0cm	-10°C	0mm	0.02kPa	0.9m/s
23:00 ☾	-12°C	0mm	96%	0cm	-12°C	0mm	0.01kPa	1.3m/s
Wed, Feb 25 Sunrise 07:36 Sunset 18:17
24:00 ☾	-12°C	0mm	95%	0cm	-12°C	0mm	0.01kPa	1.2m/s
01:00 ☾	-13°C	0mm	95%	0cm	-12°C	0mm	0.01kPa	0.99m/s
02:00 ☾	-13°C	0mm	95%	0cm	-12°C	0mm	0.01kPa	0.84m/s
03:00 ☾	-11°C	0mm	90%	0cm	-9.3°C	0mm	0.03kPa	0.8m/s
04:00 ☾	-8.9°C	0mm	84%	0cm	-6.7°C	0mm	0.06kPa	0.76m/s
05:00 ☾	-7.1°C	0mm	79%	0cm	-4°C	0mm	0.1kPa	0.72m/s
06:00 ☾	-6.2°C	0.01mm	80%	0.01cm	-3.2°C	0mm	0.1kPa	1.6m/s
07:00 ☾	-5.3°C	0.02mm	81%	0.02cm	-2.5°C	0mm	0.1kPa	2.5m/s
08:00 ☾	-4.4°C	0.03mm	82%	0.03cm	-1.7°C	0mm	0.1kPa	3.4m/s
09:00 ☾	-4°C	0.04mm	82%	0.04cm	-1.4°C	0.1mm	0.1kPa	3.2m/s
10:00 ☾	-3.6°C	0.04mm	82%	0.05cm	-0.98°C	0.21mm	0.1kPa	2.9m/s
11:00 ☾	-3.2°C	0.05mm	83%	0.06cm	-0.59°C	0.31mm	0.1kPa	2.6m/s
12:00 ☾	-5.1°C	0.04mm	86%	0.04cm	-3.2°C	0.23mm	0.07kPa	2m/s
13:00 ☾	-7.1°C	0.02mm	90%	0.02cm	-5.7°C	0.15mm	0.04kPa	1.4m/s
14:00 ☾	-9.2°C	0.01mm	93%	0cm	-8.3°C	0.06mm	0.02kPa	0.81m/s
15:00 ☾	-9.6°C	0.007mm	94%	0cm	-8.8°C	0.06mm	0.02kPa	1m/s
16:00 ☾	-10°C	0.003mm	94%	0cm	-9.3°C	0.06mm	0.02kPa	1.3m/s
17:00 ☾	-10°C	0mm	95%	0cm	-9.8°C	0.06mm	0.02kPa	1.5m/s

How to read: these inputs help produce the derived score; they are not requirements by themselves.

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