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Rule Morning Frost

Boone - Morning Frost - Smoky Mountains & Blue Ridge

Boone, 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 83% failing
Wind Speed 60% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature9.9°C
Dew Point2.0°C (low dew point)
Wind Speed2.9m/s (calm conditions)
Cloud Cover24%

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 85 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
Tue, Apr 21
01:00✕4.4%0.82m/s
02:00✕4.4%0.83m/s
03:00✕5%0.79m/s
04:00✕5%0.75m/s
05:00✕5%0.73m/s
06:00✓4.4%0.87m/s
07:00✓5%0.47m/s
08:00✓5%0.43m/s
09:00✕4.6%0.9m/s
10:00✕4%1.1m/s
11:00✕3.8%1.3m/s
12:00✕3.6%2.1m/s
13:00✕0%2.5m/s
14:00✕0%2.7m/s
15:00✕0%2.9m/s
16:00✕0%3.6m/s
17:00✕0%3.7m/s
18:00✕0%2.7m/s
19:00✕0%1.5m/s
20:00✕0%1.1m/s
21:00✕0%1.4m/s
22:00✕0%1.2m/s
23:00✕0%1.1m/s
Wed, Apr 22
24:00✕0%1.2m/s
01:00✕0%1.3m/s
02:00✕0%1.8m/s
03:00✕0%1.9m/s
04:00✕0%2m/s
05:00✓0%2.2m/s
06:00✓0%2m/s
07:00✓0%1.8m/s
08:00✓0%2.5m/s
09:00✕0%4.1m/s
10:00✕0%5.6m/s
11:00✕0%6.6m/s
12:00✕0%6.9m/s
13:00✕0%7.1m/s
14:00✕0%6.6m/s
15:00✕0%6.3m/s
16:00✕0%6m/s
17:00✕0%5.7m/s
18:00✕0%5m/s
19:00✕0%4.3m/s
20:00✕0%2.6m/s
21:00✕0%2.2m/s
22:00✕0%2.2m/s
23:00✕0%2.1m/s
Thu, Apr 23
24:00✕0%1.8m/s
01:00✕0%1.6m/s
02:00✕0%1.4m/s
03:00✕0%1.5m/s
04:00✕0%1.5m/s
05:00✓0%1.4m/s
06:00✓0%1.4m/s
07:00✓0%1.4m/s
08:00✓0%1.2m/s
09:00✕0%1.7m/s
10:00✕0%2.7m/s
11:00✕0%3.1m/s
12:00✕0%3.2m/s
13:00✕0%3.4m/s
14:00✕0%3.6m/s
15:00✕0%4.1m/s
16:00✕0%4.4m/s
17:00✕0%4.2m/s
18:00✕0%3.8m/s
19:00✕0%2.8m/s
20:00✕0%1.6m/s
21:00✕0%1.4m/s
22:00✕0%1.2m/s
23:00✕0%1m/s
Fri, Apr 24
24:00✕0%0.92m/s
01:00✕0%0.84m/s
02:00✕0%0.76m/s
03:00✕0%1.1m/s
04:00✕0%1.4m/s
05:00✓0%1.7m/s
06:00✓0%1.5m/s
07:00✓0%1.3m/s
08:00✓0%1.1m/s
09:00✕0%0.79m/s
10:00✕0%0.45m/s
11:00✕0%0.11m/s
12:00✕0%0.39m/s
13:00✕0%0.66m/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 21 Sunrise 06:45 Sunset 20:05
15:00
2°C 9.9°C 18°C - 24% 1.4kPa
16:00
1.9°C 10°C 18°C - 100% 1.4kPa
17:00
1.9°C 11°C 17°C - 100% 1.3kPa
18:00
3°C 11°C 17°C - 100% 1.1kPa
19:00
6.1°C 11°C 15°C - 100% 0.71kPa
20:00 ☾
5.1°C 11°C 10°C - 100% 0.36kPa
21:00 ☾
4.2°C 11°C 8.9°C - 100% 0.31kPa
22:00 ☾
3°C 11°C 8.4°C - 100% 0.35kPa
23:00 ☾
2.2°C 11°C 8.3°C - 100% 0.38kPa
Wed, Apr 22 Sunrise 06:44 Sunset 20:06
24:00 ☾
2°C 11°C 8.4°C - 100% 0.4kPa
01:00 ☾
2.2°C 10°C 8.7°C - 100% 0.41kPa
02:00 ☾
2.7°C 10°C 8.8°C - 100% 0.39kPa
03:00 ☾
3.1°C 10°C 8.3°C - 80% 0.33kPa
04:00 ☾
3.5°C 10°C 7.8°C - 89% 0.27kPa
05:00 ☾
3.8°C 10°C 7.8°C - 95% 0.25kPa
06:00 ☾
4°C 9.9°C 7.6°C - 100% 0.23kPa
07:00
4.2°C 9.7°C 7.3°C - 100% 0.2kPa
08:00
5°C 9.6°C 9.9°C - 100% 0.35kPa
09:00
4.8°C 9.8°C 13°C - 80% 0.65kPa
10:00
3.9°C 10°C 15°C - 17% 0.88kPa
11:00
3.1°C 10°C 16°C - 25% 1.1kPa
12:00
2.5°C 11°C 17°C - 14% 1.3kPa
13:00
3.2°C 11°C 18°C - 14% 1.3kPa
14:00
4.1°C 12°C 18°C - 16% 1.3kPa
15:00
4.1°C 12°C 18°C - 27% 1.3kPa
16:00
4.3°C 12°C 18°C - 35% 1.3kPa
17:00
4.6°C 13°C 18°C - 42% 1.2kPa
18:00
6°C 13°C 18°C - 90% 1.1kPa
19:00
6.7°C 13°C 16°C - 84% 0.8kPa
20:00 ☾
7°C 13°C 13°C - 69% 0.45kPa
21:00 ☾
6.6°C 13°C 11°C - 95% 0.32kPa
22:00 ☾
6°C 13°C 11°C - 98% 0.35kPa
23:00 ☾
5.9°C 13°C 11°C - 96% 0.35kPa
Thu, Apr 23 Sunrise 06:43 Sunset 20:07
24:00 ☾
5.9°C 13°C 10°C - 61% 0.31kPa
01:00 ☾
5.7°C 12°C 9.2°C - 22% 0.25kPa
02:00 ☾
5.5°C 12°C 8.6°C - 5% 0.21kPa
03:00 ☾
5.3°C 12°C 8.3°C - 5% 0.2kPa
04:00 ☾
5.1°C 12°C 8.1°C - 5% 0.2kPa
05:00 ☾
5°C 11°C 7.8°C - 5% 0.19kPa
06:00 ☾
4.9°C 11°C 7.7°C - 12% 0.18kPa
07:00
5°C 11°C 7.7°C - 5% 0.18kPa
08:00
6.1°C 11°C 11°C - 5% 0.36kPa
09:00
6.7°C 11°C 14°C - 3% 0.65kPa
10:00
6.3°C 11°C 16°C - 0% 0.88kPa
11:00
5.9°C 12°C 17°C - 0% 1.1kPa
12:00
5.4°C 12°C 19°C - 4% 1.2kPa
13:00
4.9°C 13°C 20°C - 5% 1.4kPa
14:00
4.5°C 13°C 20°C - 5% 1.6kPa
15:00
4.5°C 13°C 21°C - 10% 1.6kPa
16:00
4.7°C 14°C 20°C - 15% 1.6kPa
17:00
5.1°C 14°C 20°C - 7% 1.4kPa
18:00
5.4°C 14°C 19°C - 5% 1.3kPa
19:00
7.3°C 15°C 17°C - 6% 0.92kPa
20:00 ☾
7.3°C 14°C 13°C - 6% 0.46kPa
21:00 ☾
7.1°C 15°C 14°C - 12% 0.6kPa
22:00 ☾
6.8°C 16°C 15°C - 19% 0.76kPa
23:00 ☾
6.3°C 17°C 17°C - 25% 0.94kPa
Fri, Apr 24 Sunrise 06:42 Sunset 20:08
24:00 ☾
6.9°C 17°C 16°C - 31% 0.87kPa
01:00 ☾
7.4°C 17°C 16°C - 36% 0.8kPa
02:00 ☾
7.9°C 17°C 16°C - 42% 0.73kPa
03:00 ☾
8.4°C 17°C 19°C - 30% 1.1kPa
04:00 ☾
8.3°C 17°C 22°C - 17% 1.5kPa
05:00 ☾
7.6°C 17°C 25°C - 5% 2kPa
06:00 ☾
7.8°C 18°C 25°C - 37% 2kPa
07:00
8.1°C 18°C 25°C - 68% 2kPa
08:00
8.4°C 18°C 24°C - 100% 2kPa
09:00
8.2°C 18°C 25°C - 90% 2.1kPa
10:00
8°C 19°C 26°C - 80% 2.2kPa
11:00
7.7°C 19°C 26°C - 69% 2.4kPa
12:00
8.6°C 19°C 24°C - 72% 1.9kPa
13:00
9.1°C 19°C 22°C - 75% 1.5kPa
14:00
9.1°C 19°C 20°C - 78% 1.1kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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