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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 88% failing
Wind Speed 85% failing

Currently

Real-time conditions
Soil Temperature19.5°C
Dew Point16.7°C (high dew point)
Wind Speed2.0m/s (calm conditions)
Cloud Cover0%

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
Wed, Jul 8
24:000%1.3m/s
01:000%1.2m/s
02:000%1.4m/s
03:000%1.6m/s
04:000%1.3m/s
05:000%1.7m/s
06:000%1.6m/s
07:000%1.4m/s
08:000%1.4m/s
09:000%1.6m/s
10:000%2m/s
11:000%2.3m/s
12:000%2.4m/s
13:000%2.7m/s
14:000%2.7m/s
15:000%2.6m/s
16:000%2.5m/s
17:000%0.88m/s
18:000%1.9m/s
19:000%2.6m/s
20:000%2m/s
21:000%1.7m/s
22:000%1.4m/s
23:000%1.2m/s
Thu, Jul 9
24:000%1.2m/s
01:000%1.4m/s
02:000%1.6m/s
03:000%1.7m/s
04:000%1.8m/s
05:000%1.8m/s
06:000%1.6m/s
07:000%1.6m/s
08:000%1.5m/s
09:000%2.3m/s
10:000%3.5m/s
11:000%4.2m/s
12:000%5m/s
13:000%5.7m/s
14:000%5.9m/s
15:000%5.7m/s
16:000%5.6m/s
17:000%5.7m/s
18:000%4.6m/s
19:000%4.1m/s
20:000%2m/s
21:000%1.7m/s
22:000%1.9m/s
23:000%1.8m/s
Fri, Jul 10
24:000%1.7m/s
01:000%1.7m/s
02:000%1.7m/s
03:000%1.5m/s
04:000%1.6m/s
05:000%1.5m/s
06:000%1.6m/s
07:000%1.5m/s
08:000%1.6m/s
09:000%2.6m/s
10:000%5.1m/s
11:000%6.1m/s
12:000%6.4m/s
13:000%5.6m/s
14:000%5.6m/s
15:000%4.7m/s
16:000%3.9m/s
17:000%3m/s
18:000%2.6m/s
19:000%2.1m/s
20:000%1.6m/s
21:000%1.6m/s
22:000%1.6m/s
23:000%1.6m/s
Sat, Jul 11
24:000%1.4m/s
01:000%1.3m/s
02:000%1.1m/s
03:000%1.5m/s
04:000%1.9m/s
05:000%2.4m/s
06:000%2.5m/s
07:000%2.7m/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, Jul 8 Sunrise 06:16 Sunset 20:46
10:00
17°C 19°C 24°C - 0% 1kPa
11:00
15°C 20°C 26°C - 0% 1.6kPa
12:00
14°C 20°C 27°C - 0% 2kPa
13:00
14°C 20°C 29°C - 67% 2.3kPa
14:00
14°C 20°C 28°C - 100% 2.3kPa
15:00
16°C 20°C 26°C - 100% 1.5kPa
16:00
17°C 20°C 23°C - 100% 0.77kPa
17:00
18°C 20°C 22°C - 40% 0.6kPa
18:00
17°C 20°C 25°C - 6% 1.2kPa
19:00
18°C 20°C 25°C - 86% 1kPa
20:00
19°C 20°C 20°C - 56% 0.22kPa
21:00
18°C 20°C 19°C - 50% 0.18kPa
22:00
17°C 20°C 19°C - 30% 0.2kPa
23:00
17°C 20°C 18°C - 38% 0.21kPa
Thu, Jul 9 Sunrise 06:17 Sunset 20:46
24:00
16°C 20°C 18°C - 48% 0.23kPa
01:00
16°C 20°C 18°C - 0% 0.25kPa
02:00
16°C 20°C 17°C - 0% 0.19kPa
03:00
16°C 20°C 17°C - 4% 0.16kPa
04:00
16°C 20°C 17°C - 5% 0.13kPa
05:00
16°C 20°C 17°C - 2% 0.09kPa
06:00
16°C 19°C 17°C - 0% 0.07kPa
07:00
16°C 19°C 17°C - 0% 0.09kPa
08:00
18°C 19°C 19°C - 0% 0.21kPa
09:00
17°C 19°C 21°C - 0% 0.53kPa
10:00
16°C 19°C 23°C - 0% 1.1kPa
11:00
15°C 20°C 25°C - 23% 1.4kPa
12:00
15°C 20°C 26°C - 45% 1.7kPa
13:00
15°C 20°C 27°C - 67% 1.8kPa
14:00
15°C 20°C 26°C - 32% 1.7kPa
15:00
16°C 20°C 26°C - 2% 1.6kPa
16:00
15°C 20°C 27°C - 7% 1.8kPa
17:00
16°C 20°C 26°C - 5% 1.6kPa
18:00
16°C 21°C 25°C - 4% 1.4kPa
19:00
17°C 21°C 24°C - 12% 1.1kPa
20:00
17°C 21°C 21°C - 4% 0.56kPa
21:00
17°C 21°C 19°C - 1% 0.23kPa
22:00
17°C 20°C 18°C - 5% 0.13kPa
23:00
17°C 20°C 18°C - 11% 0.16kPa
Fri, Jul 10 Sunrise 06:18 Sunset 20:45
24:00
16°C 20°C 17°C - 5% 0.1kPa
01:00
16°C 20°C 17°C - 2% 0.09kPa
02:00
16°C 20°C 17°C - 0% 0.1kPa
03:00
16°C 20°C 17°C - 1% 0.1kPa
04:00
16°C 20°C 17°C - 2% 0.1kPa
05:00
16°C 20°C 17°C - 5% 0.1kPa
06:00
16°C 20°C 16°C - 20% 0.09kPa
07:00
16°C 19°C 17°C - 20% 0.11kPa
08:00
18°C 19°C 19°C - 5% 0.17kPa
09:00
18°C 19°C 22°C - 98% 0.49kPa
10:00
16°C 19°C 25°C - 98% 1.3kPa
11:00
16°C 20°C 25°C - 13% 1.4kPa
12:00
18°C 20°C 24°C - 15% 0.86kPa
13:00
15°C 20°C 26°C - 12% 1.7kPa
14:00
14°C 20°C 28°C - 12% 2.1kPa
15:00
17°C 22°C 26°C - 41% 1.5kPa
16:00
18°C 24°C 24°C - 71% 0.94kPa
17:00
20°C 25°C 23°C - 100% 0.5kPa
18:00
20°C 25°C 22°C - 100% 0.37kPa
19:00
20°C 25°C 22°C - 100% 0.25kPa
20:00
20°C 25°C 21°C - 100% 0.14kPa
21:00
20°C 25°C 21°C - 100% 0.11kPa
22:00
20°C 25°C 21°C - 100% 0.09kPa
23:00
20°C 24°C 21°C - 100% 0.06kPa
Sat, Jul 11 Sunrise 06:18 Sunset 20:45
24:00
20°C 24°C 21°C - 100% 0.08kPa
01:00
20°C 24°C 21°C - 100% 0.1kPa
02:00
20°C 24°C 21°C - 100% 0.12kPa
03:00
20°C 24°C 23°C - 100% 0.41kPa
04:00
20°C 24°C 25°C - 100% 0.78kPa
05:00
20°C 24°C 27°C - 100% 1.2kPa
06:00
20°C 24°C 27°C - 100% 1.2kPa
07:00
20°C 24°C 27°C - 99% 1.2kPa
08:00
21°C 24°C 28°C - 99% 1.2kPa
09:00
21°C 24°C 26°C - 99% 0.83kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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