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Rule Morning Frost

Blowing Rock - Morning Frost - Smoky Mountains & Blue Ridge

Blowing Rock, 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 71% failing

Currently

Real-time conditions
Soil Temperature16.2°C
Dew Point9.0°C (moderate dew point)
Wind Speed4.0m/s (calm conditions)
Cloud Cover88%

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 95 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
Mon, Apr 13
15:000%3.1m/s
16:000%2.4m/s
17:000%1.9m/s
18:000%1.8m/s
19:000%1.4m/s
20:000%1.1m/s
21:000%0.93m/s
22:000%0.61m/s
23:000%0.75m/s
Tue, Apr 14
24:000%0.96m/s
01:000%1.3m/s
02:000%1.3m/s
03:000%1.4m/s
04:000%1.2m/s
05:000%0.86m/s
06:000%1.1m/s
07:000%1m/s
08:000%1m/s
09:000%2.1m/s
10:000%3.2m/s
11:000%3.7m/s
12:000%3.7m/s
13:000%3.7m/s
14:000%3.8m/s
15:000%4m/s
16:000%4m/s
17:000%3.8m/s
18:000%3.7m/s
19:000%2.8m/s
20:000%1.6m/s
21:000%1.3m/s
22:000%1.1m/s
23:000%1m/s
Wed, Apr 15
24:000%1.3m/s
01:000%1.6m/s
02:000%1.7m/s
03:000%1.7m/s
04:000%1.8m/s
05:000%1.6m/s
06:000%1.5m/s
07:000%1.5m/s
08:000%1.6m/s
09:000%1.4m/s
10:000%2m/s
11:000%2.7m/s
12:000%2.8m/s
13:000%2.9m/s
14:000%2.9m/s
15:000%2.2m/s
16:000%1.7m/s
17:000%1.8m/s
18:000%0.98m/s
19:000%1.7m/s
20:000%1.5m/s
21:000%1.4m/s
22:000%1.3m/s
23:000%1.6m/s
Thu, Apr 16
24:000%1.4m/s
01:000%1.5m/s
02:000%1.4m/s
03:000%1.5m/s
04:000%1.8m/s
05:000%1.7m/s
06:000%1.6m/s
07:000%1.2m/s
08:000%0.63m/s
09:000%1.1m/s
10:000%2.4m/s
11:000%2.7m/s
12:000%3.1m/s
13:000%3.6m/s
14:000%3.9m/s
15:000%4m/s
16:000%4.2m/s
17:000%4.6m/s
18:000%4.1m/s
19:000%2.7m/s
20:000%2m/s
21:000%1.8m/s
22:000%1.6m/s
23:000%1.4m/s
Fri, Apr 17
24:000%1.3m/s
01:000%1.2m/s
02:000%1.1m/s
03:000%1.2m/s
04:000%1.3m/s
05:000%1.3m/s
06:000%1.7m/s
07:000%2m/s
08:000%2.3m/s
09:000%3m/s
10:000%3.6m/s
11:000%4.2m/s
12:000%3.6m/s
13:000%2.9m/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
Tue, Apr 14 Sunrise 06:54 Sunset 19:59
15:00
9°C 16°C 24°C - 88% 1.7kPa
16:00
9.9°C 16°C 23°C - 79% 1.6kPa
17:00
11°C 17°C 22°C - 66% 1.4kPa
18:00
11°C 17°C 21°C - 10% 1.2kPa
19:00
12°C 17°C 20°C - 5% 0.84kPa
20:00
12°C 17°C 15°C - 5% 0.35kPa
21:00
12°C 17°C 14°C - 19% 0.23kPa
22:00
12°C 17°C 14°C - 99% 0.21kPa
23:00
11°C 16°C 14°C - 100% 0.22kPa
Wed, Apr 15 Sunrise 06:53 Sunset 20:00
24:00
11°C 16°C 13°C - 68% 0.27kPa
01:00
9.8°C 16°C 13°C - 90% 0.33kPa
02:00
9°C 16°C 13°C - 100% 0.38kPa
03:00
8.6°C 15°C 13°C - 100% 0.41kPa
04:00
8.6°C 15°C 13°C - 100% 0.37kPa
05:00
8.6°C 15°C 12°C - 100% 0.33kPa
06:00
8.2°C 15°C 12°C - 99% 0.33kPa
07:00
7.7°C 14°C 12°C - 88% 0.32kPa
08:00
8°C 14°C 14°C - 100% 0.5kPa
09:00
7°C 14°C 17°C - 91% 0.96kPa
10:00
5°C 15°C 20°C - 100% 1.4kPa
11:00
4.8°C 15°C 21°C - 100% 1.7kPa
12:00
5°C 15°C 23°C - 100% 1.9kPa
13:00
5.6°C 16°C 24°C - 5% 2kPa
14:00
6.2°C 17°C 25°C - 5% 2.1kPa
15:00
6.8°C 17°C 26°C - 5% 2.3kPa
16:00
7.2°C 18°C 26°C - 96% 2.3kPa
17:00
8°C 18°C 24°C - 17% 2kPa
18:00
8.8°C 18°C 23°C - 100% 1.8kPa
19:00
11°C 19°C 21°C - 100% 1.1kPa
20:00
11°C 18°C 16°C - 98% 0.56kPa
21:00
10°C 18°C 15°C - 100% 0.45kPa
22:00
10°C 18°C 14°C - 100% 0.38kPa
23:00
10°C 17°C 14°C - 100% 0.35kPa
Thu, Apr 16 Sunrise 06:52 Sunset 20:01
24:00
10°C 17°C 14°C - 100% 0.32kPa
01:00
10°C 17°C 14°C - 100% 0.32kPa
02:00
10°C 17°C 14°C - 100% 0.32kPa
03:00
9.9°C 16°C 13°C - 100% 0.29kPa
04:00
9.7°C 16°C 13°C - 100% 0.29kPa
05:00
9.4°C 16°C 12°C - 100% 0.25kPa
06:00
9.4°C 15°C 12°C - 100% 0.22kPa
07:00
9.5°C 15°C 12°C - 100% 0.21kPa
08:00
10°C 15°C 14°C - 100% 0.37kPa
09:00
10°C 15°C 17°C - 100% 0.77kPa
10:00
8.8°C 15°C 20°C - 100% 1.2kPa
11:00
9°C 16°C 21°C - 100% 1.3kPa
12:00
8.7°C 16°C 22°C - 100% 1.5kPa
13:00
8.4°C 16°C 23°C - 100% 1.7kPa
14:00
8.2°C 17°C 24°C - 100% 1.8kPa
15:00
8.4°C 17°C 24°C - 99% 1.9kPa
16:00
9.3°C 18°C 23°C - 64% 1.7kPa
17:00
11°C 18°C 22°C - 76% 1.4kPa
18:00
10°C 18°C 21°C - 54% 1.2kPa
19:00
9.9°C 18°C 19°C - 1% 1kPa
20:00
9.3°C 18°C 15°C - 92% 0.58kPa
21:00
11°C 18°C 15°C - 70% 0.44kPa
22:00
13°C 19°C 15°C - 48% 0.29kPa
23:00
14°C 19°C 15°C - 26% 0.14kPa
Fri, Apr 17 Sunrise 06:50 Sunset 20:02
24:00
14°C 19°C 16°C - 17% 0.17kPa
01:00
14°C 19°C 16°C - 9% 0.19kPa
02:00
14°C 18°C 16°C - 0% 0.22kPa
03:00
14°C 18°C 19°C - 33% 0.58kPa
04:00
14°C 18°C 22°C - 67% 1.1kPa
05:00
12°C 19°C 25°C - 100% 1.8kPa
06:00
11°C 19°C 26°C - 68% 2.1kPa
07:00
9°C 20°C 28°C - 37% 2.6kPa
08:00
6.4°C 20°C 29°C - 5% 3.1kPa
09:00
6.5°C 21°C 29°C - 3% 3kPa
10:00
6.5°C 21°C 29°C - 2% 3kPa
11:00
6.6°C 22°C 29°C - 0% 2.9kPa
12:00
9°C 22°C 26°C - 3% 2.2kPa
13:00
10°C 22°C 23°C - 7% 1.6kPa
14:00
11°C 22°C 21°C - 10% 1.1kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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