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Rating | Wind, Damage |
F0 (weak) | 40-72 mph, light damage |
F1 (weak) | 73-112 mph, moderate damage |
F2 (strong) | 113-157 mph, considerable damage |
F3 (strong) | 158-206 mph, severe damage |
F4 (violent) | 207-260 mph, devestating damage |
F5 (violent) | 260-318 mph (rare), incredible damage |
Description | Diameter (inches) |
Pea | 0.25 |
Marble or Mothball | 0.50 |
Penny or Dime | 0.75 |
Nickel | 0.88 |
Quarter | 1.00 |
Half Dollar | 1.25 |
Walnut or Ping Pong Ball | 1.50 |
Golfball | 1.75 |
Hen's Egg | 2.00 |
Tennis Ball | 2.50 |
Baseball | 2.75 |
Tea Cup | 3.00 |
Grapefruit | 4.00 |
Softball | 4.50 |
Sky Condition | Cloud Coverage |
Clear / Sunny | 0/8 |
Mostly Clear / Mostly Sunny | 1/8 to 2/8 |
Partly Cloudy / Partly Sunny | 3/8 to 4/8 |
Mostly Cloudy / Considerable Cloudiness | 5/8 to 7/8 |
Cloudy | 8/8 |
Fair (mainly for night) | Less than 4/10 opaque clouds, no precipitation, no extremes of visibility/temperature/wind |
Category | UV Index | Time to Burn | Actions to Take |
Minimal | 0 - 2 | 60 min. + | Apply SPF sunscreen. |
Low | 3 - 4 | 45 min. | Apply SPF sunscreen, wear a hat. |
Moderate | 5 - 6 | 30 min. | Apply SPF 15, wear a hat. |
High | 7 - 9 | 15 - 24 min. | Apply SPF 15 to 30, wear a hat and sunglasses. Limit midday exposure. |
Very High | 10+ | 10 min. | Apply SPF 30; wear a hat, sunglasses, and protective clothing; limit midday exposure. |
Category | UV Index | Time to Burn | Actions to Take |
Minimal | 0 - 2 | 60 min. + | Apply SPF sunscreen. |
Low | 3 - 4 | 45 min. | Apply SPF sunscreen, wear a hat. |
Moderate | 5 - 6 | 30 min. | Apply SPF 15, wear a hat. |
High | 7 - 9 | 15 - 24 min. | Apply SPF 15 to 30, wear a hat and sunglasses. Limit midday exposure. |
Very High | 10+ | 10 min. | Apply SPF 30; wear a hat, sunglasses, and protective clothing; limit midday exposure. |
Class | Intensity (in Watts/m2) |
B | I < 10-6 |
C | 10-6 <= I < 10-5 |
M | 10-5 <= I < 10-4 |
X | I >= 10-4 |