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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 47% failing

Currently

Real-time conditions
Soil Temperature9.5°C
Dew Point-0.5°C (low dew point)
Wind Speed1.0m/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 92 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
Wed, Apr 8
24:000%1.6m/s
01:000%1.6m/s
02:000%1.6m/s
03:000%1.5m/s
04:000%1.7m/s
05:000%1.9m/s
06:000%1.6m/s
07:000%1.5m/s
08:003.8%1.5m/s
09:000%2.4m/s
10:000%2.4m/s
11:000%2.4m/s
12:000%2.8m/s
13:000%3m/s
14:000%3.1m/s
15:000%3.2m/s
16:000%3m/s
17:000%3m/s
18:000%2.8m/s
19:000%2.2m/s
20:000%1.5m/s
21:000%1.1m/s
22:000%0.96m/s
23:000%0.8m/s
Thu, Apr 9
24:000%0.67m/s
01:000%0.82m/s
02:000%0.75m/s
03:003.6%0.46m/s
04:004%0.56m/s
05:005%0.41m/s
06:005%0.21m/s
07:004%0.7m/s
08:003.8%0.92m/s
09:003.6%1.1m/s
10:003.5%1.4m/s
11:003%1.9m/s
12:002.4%2.1m/s
13:000%2.4m/s
14:000%2.4m/s
15:000%2.9m/s
16:000%3.1m/s
17:000%3m/s
18:000%2.7m/s
19:000%2.1m/s
20:000%0.93m/s
21:000%0.47m/s
22:000%0.81m/s
23:000%0.82m/s
Fri, Apr 10
24:000%1m/s
01:000%1.1m/s
02:000%1.3m/s
03:000%1.2m/s
04:000%1.2m/s
05:005%1.4m/s
06:005%1.1m/s
07:005%1.3m/s
08:005%1.3m/s
09:004.8%0.6m/s
10:003.8%0.9m/s
11:000%1.3m/s
12:000%1.6m/s
13:000%2.1m/s
14:000%2.4m/s
15:000%2.8m/s
16:000%3m/s
17:000%3m/s
18:000%2.8m/s
19:000%2.2m/s
20:000%2.1m/s
21:000%2m/s
22:000%1.9m/s
23:000%1.9m/s
Sat, Apr 11
24:000%1.7m/s
01:000%1.7m/s
02:000%1.9m/s
03:000%1.6m/s
04:000%1.3m/s
05:000%1m/s
06:000%1.5m/s
07:000%2.1m/s
08:000%2.6m/s
09:000%2.9m/s
10:000%3.1m/s
11:000%3.4m/s
12:000%2.5m/s
13:000%1.6m/s
14:000%0.68m/s
15:000%1.1m/s
16:000%1.4m/s
17:000%1.8m/s
18:000%1.4m/s
19:000%0.94m/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
Wed, Apr 8 Sunrise 07:06 Sunset 19:58
22:00
-0.5°C 9.5°C 5.1°C - 100% 0.29kPa
23:00
-1°C 9.2°C 4.8°C - 100% 0.29kPa
Thu, Apr 9 Sunrise 07:06 Sunset 19:58
24:00
-1.4°C 8.9°C 4.4°C - 100% 0.29kPa
01:00
-1.9°C 8.6°C 3.9°C - 88% 0.27kPa
02:00
-2.1°C 8.3°C 3.4°C - 68% 0.26kPa
03:00
-2.3°C 8°C 2.9°C - 100% 0.24kPa
04:00
-2.6°C 7.7°C 2.7°C - 57% 0.24kPa
05:00
-3.2°C 7.4°C 1.9°C - 6% 0.22kPa
06:00
-3.6°C 7.1°C 1.4°C - 10% 0.21kPa
07:00
-3.9°C 6.6°C 1.1°C - 51% 0.21kPa
08:00
-3.5°C 6.5°C 3°C - 80% 0.28kPa
09:00
-3.7°C 6.5°C 5.8°C - 91% 0.46kPa
10:00
-3.4°C 6.7°C 8.2°C - 52% 0.61kPa
11:00
-2.9°C 7.1°C 11°C - 73% 0.8kPa
12:00
-2.4°C 7.6°C 13°C - 74% 0.96kPa
13:00
-2.3°C 8.2°C 14°C - 77% 1.1kPa
14:00
-1.9°C 8.7°C 15°C - 61% 1.2kPa
15:00
-1.5°C 9.3°C 16°C - 87% 1.2kPa
16:00
-1.3°C 9.8°C 15°C - 51% 1.2kPa
17:00
-1.1°C 10°C 15°C - 46% 1.1kPa
18:00
-0.9°C 10°C 14°C - 43% 1kPa
19:00
1.1°C 11°C 12°C - 16% 0.75kPa
20:00
0.1°C 10°C 7.4°C - 4% 0.41kPa
21:00
-0.5°C 10°C 6.4°C - 0% 0.37kPa
22:00
-1.1°C 9.8°C 5.9°C - 0% 0.36kPa
23:00
-1.6°C 9.5°C 5.5°C - 0% 0.36kPa
Fri, Apr 10 Sunrise 07:05 Sunset 19:59
24:00
-1.9°C 9.2°C 5.3°C - 0% 0.36kPa
01:00
-2.3°C 8.9°C 5.1°C - 0% 0.36kPa
02:00
-2.4°C 8.7°C 5°C - 0% 0.36kPa
03:00
-2.7°C 8.4°C 4.8°C - 0% 0.36kPa
04:00
-3°C 8.2°C 4.7°C - 0% 0.37kPa
05:00
-3.3°C 8°C 4.7°C - 0% 0.37kPa
06:00
-3.7°C 7.7°C 4.4°C - 0% 0.37kPa
07:00
-4.1°C 7.5°C 4.4°C - 0% 0.39kPa
08:00
-2.8°C 7.4°C 6.4°C - 0% 0.46kPa
09:00
-2.2°C 7.6°C 11°C - 0% 0.76kPa
10:00
-1.8°C 8°C 14°C - 0% 1kPa
11:00
-0.8°C 8.6°C 16°C - 0% 1.3kPa
12:00
-0.1°C 9.3°C 18°C - 0% 1.4kPa
13:00
0.4°C 10°C 19°C - 0% 1.6kPa
14:00
1°C 11°C 20°C - 0% 1.6kPa
15:00
1.6°C 11°C 20°C - 1% 1.6kPa
16:00
2.4°C 12°C 20°C - 0% 1.6kPa
17:00
3.2°C 12°C 19°C - 3% 1.5kPa
18:00
3.8°C 13°C 18°C - 0% 1.3kPa
19:00
6°C 13°C 16°C - 1% 0.86kPa
20:00
5°C 13°C 11°C - 5% 0.48kPa
21:00
4.2°C 13°C 10°C - 4% 0.42kPa
22:00
3.6°C 12°C 9.6°C - 4% 0.4kPa
23:00
3.4°C 12°C 9.4°C - 6% 0.4kPa
Sat, Apr 11 Sunrise 07:04 Sunset 20:00
24:00
3.2°C 12°C 9.2°C - 28% 0.39kPa
01:00
3.3°C 12°C 9.1°C - 5% 0.38kPa
02:00
3.4°C 11°C 9°C - 6% 0.37kPa
03:00
5.3°C 12°C 14°C - 6% 0.66kPa
04:00
6.5°C 13°C 18°C - 5% 1.1kPa
05:00
6.7°C 13°C 23°C - 4% 1.8kPa
06:00
6.3°C 14°C 24°C - 4% 1.9kPa
07:00
5.7°C 15°C 25°C - 4% 2.2kPa
08:00
4.9°C 16°C 25°C - 4% 2.4kPa
09:00
5.5°C 16°C 25°C - 36% 2.3kPa
10:00
5.9°C 17°C 25°C - 68% 2.3kPa
11:00
6.4°C 17°C 25°C - 100% 2.2kPa
12:00
7.8°C 17°C 23°C - 67% 1.7kPa
13:00
8.4°C 18°C 20°C - 34% 1.2kPa
14:00
8.4°C 18°C 17°C - 1% 0.88kPa
15:00
8.2°C 17°C 17°C - 1% 0.79kPa
16:00
8°C 17°C 16°C - 0% 0.7kPa
17:00
7.7°C 17°C 15°C - 0% 0.62kPa
18:00
7.6°C 17°C 14°C - 2% 0.57kPa
19:00
7.4°C 16°C 14°C - 3% 0.53kPa
20:00
7.2°C 16°C 13°C - 5% 0.49kPa
21:00
7.2°C 16°C 13°C - 28% 0.45kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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