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Rule Morning Frost

Sylva - Morning Frost - Smoky Mountains & Blue Ridge

Sylva, 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 40% failing

Currently

Real-time conditions
Soil Temperature15.8°C
Dew Point15.9°C (high dew point)
Wind Speed1.2m/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%2.2m/s
01:000%1.5m/s
02:000%1.4m/s
03:000%1.1m/s
04:000%1.3m/s
05:000%1.5m/s
06:000%1.2m/s
07:000%1.2m/s
08:000%1.3m/s
09:000%1.2m/s
10:000%1.4m/s
11:000%1.3m/s
12:000%1.3m/s
13:000%1.6m/s
14:000%1.4m/s
15:000%1.6m/s
16:000%2.1m/s
17:000%2.6m/s
18:000%2.2m/s
19:000%1.8m/s
20:000%1.5m/s
21:000%1.5m/s
22:000%1.4m/s
23:000%1.4m/s
Mon, May 25
24:000%1.3m/s
01:000%0.75m/s
02:000%1.5m/s
03:000%0.78m/s
04:000%0.93m/s
05:000%1.1m/s
06:000%1.1m/s
07:000%1m/s
08:000%1m/s
09:000%1.1m/s
10:000%1m/s
11:000%1.6m/s
12:000%1.6m/s
13:000%1.7m/s
14:000%2m/s
15:000%1.9m/s
16:000%1.5m/s
17:000%1.1m/s
18:000%0.8m/s
19:000%0.79m/s
20:000%1.5m/s
21:000%1.9m/s
22:000%1.4m/s
23:000%1.8m/s
Tue, May 26
24:000%0.47m/s
01:000%0.71m/s
02:000%0.99m/s
03:000%1.5m/s
04:000%1.5m/s
05:000%1.1m/s
06:000%0.79m/s
07:000%0.77m/s
08:000%0.15m/s
09:000%0.46m/s
10:000%0.9m/s
11:000%1.4m/s
12:000%1.6m/s
13:000%1.6m/s
14:000%1.5m/s
15:000%1.5m/s
16:000%1.5m/s
17:000%1.5m/s
18:000%1.3m/s
19:000%1.1m/s
20:000%0.92m/s
21:000%1.3m/s
22:000%1.6m/s
23:000%1.9m/s
Wed, May 27
24:000%1.8m/s
01:000%1.6m/s
02:000%1.5m/s
03:000%1.6m/s
04:000%1.6m/s
05:000%1.7m/s
06:000%1.8m/s
07:000%1.9m/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
Sun, May 24 Sunrise 06:22 Sunset 20:37
09:00
16°C 16°C 16°C - 100% 0.04kPa
10:00
16°C 16°C 16°C - 100% 0.02kPa
11:00
16°C 16°C 16°C - 100% 0.02kPa
12:00
17°C 16°C 17°C - 100% 0.06kPa
13:00
17°C 16°C 18°C - 100% 0.13kPa
14:00
16°C 16°C 18°C - 97% 0.19kPa
15:00
17°C 16°C 19°C - 71% 0.34kPa
16:00
16°C 16°C 21°C - 68% 0.71kPa
17:00
16°C 16°C 22°C - 85% 0.72kPa
18:00
17°C 16°C 21°C - 77% 0.59kPa
19:00
17°C 16°C 20°C - 42% 0.45kPa
20:00
17°C 16°C 18°C - 88% 0.21kPa
21:00
16°C 16°C 16°C - 99% 0.06kPa
22:00
15°C 16°C 16°C - 90% 0.05kPa
23:00
16°C 16°C 16°C - 100% 0.04kPa
Mon, May 25 Sunrise 06:22 Sunset 20:37
24:00
16°C 16°C 16°C - 100% 0.01kPa
01:00
16°C 16°C 16°C - 100% 0.02kPa
02:00
16°C 16°C 16°C - 100% 0.01kPa
03:00
16°C 16°C 16°C - 100% 0.02kPa
04:00
16°C 16°C 16°C - 87% 0.03kPa
05:00
15°C 16°C 15°C - 100% 0.03kPa
06:00
15°C 16°C 15°C - 95% 0.03kPa
07:00
15°C 16°C 15°C - 97% 0.03kPa
08:00
16°C 16°C 16°C - 100% 0.04kPa
09:00
16°C 16°C 16°C - 100% 0.04kPa
10:00
17°C 16°C 17°C - 95% 0.11kPa
11:00
17°C 16°C 19°C - 100% 0.3kPa
12:00
16°C 16°C 20°C - 100% 0.42kPa
13:00
16°C 16°C 22°C - 100% 0.91kPa
14:00
16°C 16°C 23°C - 100% 0.92kPa
15:00
17°C 17°C 22°C - 100% 0.73kPa
16:00
19°C 17°C 21°C - 100% 0.32kPa
17:00
19°C 17°C 20°C - 100% 0.14kPa
18:00
18°C 17°C 19°C - 100% 0.11kPa
19:00
19°C 17°C 20°C - 100% 0.11kPa
20:00
17°C 17°C 18°C - 100% 0.09kPa
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% 0.01kPa
Tue, May 26 Sunrise 06:21 Sunset 20:38
24:00
17°C 17°C 17°C - 100% 0.01kPa
01:00
16°C 17°C 16°C - 100% 0.01kPa
02:00
16°C 17°C 16°C - 90% 0.03kPa
03:00
15°C 17°C 16°C - 94% 0.03kPa
04:00
15°C 17°C 16°C - 90% 0.02kPa
05:00
15°C 17°C 15°C - 95% 0.03kPa
06:00
14°C 16°C 14°C - 100% 0.02kPa
07:00
14°C 16°C 14°C - 100% 0.02kPa
08:00
16°C 16°C 16°C - 100% 0.05kPa
09:00
16°C 16°C 17°C - 100% 0.11kPa
10:00
17°C 16°C 19°C - 100% 0.3kPa
11:00
16°C 16°C 22°C - 100% 0.75kPa
12:00
17°C 17°C 23°C - 54% 0.79kPa
13:00
18°C 17°C 22°C - 31% 0.59kPa
14:00
19°C 17°C 22°C - 51% 0.55kPa
15:00
18°C 17°C 20°C - 67% 0.34kPa
16:00
17°C 16°C 18°C - 84% 0.18kPa
17:00
15°C 16°C 16°C - 100% 0.05kPa
18:00
15°C 16°C 16°C - 100% 0.06kPa
19:00
15°C 16°C 16°C - 100% 0.07kPa
20:00
15°C 16°C 16°C - 100% 0.08kPa
21:00
15°C 16°C 15°C - 100% 0.08kPa
22:00
14°C 16°C 15°C - 100% 0.08kPa
23:00
14°C 16°C 15°C - 100% 0.07kPa
Wed, May 27 Sunrise 06:21 Sunset 20:39
24:00
15°C 16°C 15°C - 100% 0.08kPa
01:00
15°C 16°C 16°C - 100% 0.09kPa
02:00
15°C 16°C 16°C - 100% 0.1kPa
03:00
16°C 16°C 17°C - 100% 0.13kPa
04:00
17°C 16°C 18°C - 100% 0.17kPa
05:00
18°C 16°C 19°C - 100% 0.22kPa
06:00
17°C 16°C 19°C - 100% 0.28kPa
07:00
17°C 16°C 19°C - 100% 0.34kPa
08:00
16°C 16°C 19°C - 100% 0.4kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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