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Rule Morning Frost

Brevard - Morning Frost - Smoky Mountains & Blue Ridge

Brevard, North Carolina, United States

Frost crystals on calm, cold mornings near sunrise

No opportunities right now
Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Frost Probability 100% failing
Time Window 88% failing
Wind Speed 63% failing

Currently

Real-time conditions
Soil Temperature15.2°C
Dew Point15.0°C (high dew point)
Wind Speed0.8m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/New_York

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts the first hard frost events that enhance the Smokies' autumn landscapes with crystalline textures. We track overnight temperatures, humidity, and elevation to identify when frost will coat mountain meadows, overlooks, and exposed vegetation with sparkling ice crystals at dawn.

The Smokies' elevation range means frost arrives at different times depending on altitude. Clingmans Dome and high overlooks can see frost as early as late September, while valleys may not freeze until late October or November. This staggered frost timing extends the season for frost photography and creates interesting elevation-based opportunities.

What makes Smoky Mountains frost photography exceptional:

  • Mountain meadows - High-elevation grassy areas like Andrews Bald develop heavy frost coverage on clear nights
  • Clingmans Dome conditions - At 6,643 feet, the highest point often experiences hoar frost creating alien landscapes
  • Frozen waterfalls - Later season frost leads to ice formations on the Smokies' countless waterfalls
  • Foliage combination - Early season frost can coincide with peak color, coating colorful leaves with ice crystals

Best frost photography requires clear, calm nights with temperatures dropping into the mid-20s Fahrenheit. High elevation locations experience frost most reliably, while valley locations need colder conditions. Arrive before dawn to catch frost plus first light—frost melts quickly after sunrise. Classic locations include Clingmans Dome observation tower, Grassy patches along Appalachian Trail, and roadside overlooks above 5,000 feet elevation.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/New_York
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sun, May 24
24:000%0.77m/s
01:000%0.58m/s
02:000%0.47m/s
03:000%0.76m/s
04:000%0.77m/s
05:000%0.78m/s
06:000%0.75m/s
07:000%0.56m/s
08:000%1.1m/s
09:000%0.84m/s
10:000%1m/s
11:000%1.2m/s
12:000%1.4m/s
13:000%1.6m/s
14:000%1.8m/s
15:000%1.8m/s
16:000%2.1m/s
17:000%2.6m/s
18:000%2.5m/s
19:000%2.2m/s
20:000%1.8m/s
21:000%1.2m/s
22:000%1.1m/s
23:000%1.3m/s
Mon, May 25
24:000%1.7m/s
01:000%0.92m/s
02:000%1.2m/s
03:000%0.6m/s
04:000%1m/s
05:000%0.55m/s
06:000%1.3m/s
07:000%1.5m/s
08:000%1.4m/s
09:000%1.6m/s
10:000%1.8m/s
11:000%2.3m/s
12:000%2.9m/s
13:000%3.1m/s
14:000%3.4m/s
15:000%3.1m/s
16:000%2.7m/s
17:000%2.5m/s
18:000%1.9m/s
19:000%1.6m/s
20:000%1.8m/s
21:000%2.2m/s
22:000%1.6m/s
23:000%2.1m/s
Tue, May 26
24:000%3m/s
01:000%1.7m/s
02:000%1.5m/s
03:000%1.7m/s
04:000%2.2m/s
05:000%2.2m/s
06:000%1.9m/s
07:000%1.9m/s
08:000%1.4m/s
09:000%1.2m/s
10:000%1.1m/s
11:000%1.5m/s
12:000%2.1m/s
13:000%2.5m/s
14:000%2.4m/s
15:000%2.3m/s
16:000%2.2m/s
17:000%2.1m/s
18:000%1.9m/s
19:000%1.6m/s
20:000%1.3m/s
21:000%1.2m/s
22:000%1.2m/s
23:000%1.1m/s
Wed, May 27
24:000%1.1m/s
01:000%1.2m/s
02:000%1.2m/s
03:000%1.8m/s
04:000%2.3m/s
05:000%2.9m/s
06:000%2.7m/s
07:000%2.5m/s
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Frost 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/New_York
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, May 24 Sunrise 06:21 Sunset 20:34
09:00
15°C 15°C 15°C - 100% 0.01kPa
10:00
15°C 15°C 15°C - 100% 0.02kPa
11:00
16°C 15°C 16°C - 100% 0.03kPa
12:00
16°C 15°C 17°C - 100% 0.06kPa
13:00
17°C 15°C 17°C - 100% 0.09kPa
14:00
16°C 15°C 17°C - 100% 0.11kPa
15:00
17°C 15°C 18°C - 100% 0.14kPa
16:00
17°C 15°C 19°C - 98% 0.26kPa
17:00
16°C 16°C 21°C - 82% 0.58kPa
18:00
16°C 16°C 20°C - 94% 0.56kPa
19:00
16°C 16°C 20°C - 98% 0.51kPa
20:00
17°C 16°C 18°C - 93% 0.22kPa
21:00
16°C 16°C 16°C - 100% 0.04kPa
22:00
15°C 16°C 16°C - 100% 0.04kPa
23:00
15°C 16°C 16°C - 100% 0.05kPa
Mon, May 25 Sunrise 06:20 Sunset 20:35
24:00
15°C 16°C 15°C - 100% 0.03kPa
01:00
16°C 16°C 16°C - 100% 0.01kPa
02:00
16°C 16°C 16°C - 100% 0.01kPa
03:00
16°C 16°C 16°C - 100% 0.01kPa
04:00
16°C 16°C 16°C - 99% 0.02kPa
05:00
16°C 16°C 16°C - 96% 0.01kPa
06:00
16°C 16°C 16°C - 100% 0.01kPa
07:00
16°C 16°C 16°C - 100% 0.02kPa
08:00
16°C 16°C 16°C - 99% 0.02kPa
09:00
16°C 16°C 17°C - 94% 0.03kPa
10:00
17°C 16°C 18°C - 96% 0.09kPa
11:00
17°C 16°C 19°C - 99% 0.24kPa
12:00
17°C 16°C 21°C - 99% 0.63kPa
13:00
16°C 16°C 23°C - 100% 1kPa
14:00
15°C 16°C 24°C - 100% 1.2kPa
15:00
16°C 16°C 24°C - 100% 1.2kPa
16:00
16°C 17°C 24°C - 100% 1kPa
17:00
19°C 17°C 21°C - 100% 0.33kPa
18:00
18°C 17°C 19°C - 100% 0.11kPa
19:00
19°C 17°C 19°C - 100% 0.1kPa
20:00
18°C 17°C 18°C - 100% 0.08kPa
21:00
17°C 17°C 17°C - 100% 0.04kPa
22:00
17°C 17°C 17°C - 100% 0.01kPa
23:00
17°C 17°C 17°C - 100% 0kPa
Tue, May 26 Sunrise 06:20 Sunset 20:36
24:00
17°C 17°C 17°C - 100% 0.04kPa
01:00
16°C 17°C 16°C - 100% 0.02kPa
02:00
16°C 17°C 16°C - 97% 0.01kPa
03:00
16°C 17°C 16°C - 100% 0.01kPa
04:00
15°C 17°C 15°C - 100% 0.01kPa
05:00
15°C 16°C 15°C - 100% 0.01kPa
06:00
15°C 16°C 15°C - 100% 0.02kPa
07:00
15°C 16°C 15°C - 100% 0.03kPa
08:00
16°C 16°C 17°C - 100% 0.08kPa
09:00
16°C 16°C 18°C - 100% 0.21kPa
10:00
16°C 16°C 21°C - 100% 0.57kPa
11:00
16°C 17°C 23°C - 100% 1.1kPa
12:00
15°C 17°C 25°C - 34% 1.4kPa
13:00
18°C 17°C 24°C - 38% 0.86kPa
14:00
19°C 17°C 23°C - 31% 0.59kPa
15:00
19°C 18°C 22°C - 54% 0.38kPa
16:00
19°C 19°C 21°C - 77% 0.2kPa
17:00
20°C 19°C 20°C - 100% 0.04kPa
18:00
19°C 19°C 20°C - 100% 0.04kPa
19:00
19°C 19°C 20°C - 100% 0.05kPa
20:00
19°C 19°C 19°C - 100% 0.06kPa
21:00
19°C 19°C 19°C - 100% 0.07kPa
22:00
19°C 19°C 19°C - 100% 0.07kPa
23:00
19°C 19°C 19°C - 100% 0.07kPa
Wed, May 27 Sunrise 06:19 Sunset 20:36
24:00
19°C 19°C 19°C - 100% 0.08kPa
01:00
19°C 19°C 19°C - 100% 0.08kPa
02:00
19°C 19°C 20°C - 100% 0.08kPa
03:00
19°C 19°C 20°C - 100% 0.18kPa
04:00
19°C 19°C 21°C - 100% 0.29kPa
05:00
19°C 19°C 22°C - 100% 0.41kPa
06:00
19°C 19°C 22°C - 100% 0.38kPa
07:00
19°C 19°C 22°C - 100% 0.36kPa
08:00
19°C 19°C 22°C - 100% 0.33kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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