| Force | Wind Speed | WMO Description |
Wind Speed Indicators | |||
|---|---|---|---|---|---|---|
| MPH | Knots | KPH | At Sea | On Land | ||
| 0 | <1 | <1 | <1 | Calm | Smooth as glass | Calm; smoke rises vertically |
| 1 | 1-3 | 1-3 | 1-5 | Light Air |
Ripples with appearance of scales; no foam crests | Smoke drift indicates wind direction; vanes do not move |
| 2 | 4-7 | 4-6 | 6-11 | Light Breeze |
Small wavelets; crests of glassy appearance | Wind felt on face; leaves rustle; vanes begin to move |
| 3 | 8-12 | 7-10 | 12-19 | Gentle Breeze |
Large wavelets; crests begin to break, scattered whitecaps | Leaves & small twigs in motion; light flags extended |
| 4 | 13-18 | 11-16 | 20-29 | Moderate Breeze |
1-4 ft. waves; numerous whitecaps | Leaves, & loose paper raised up; flags flap; small branches move. |
| 5 | 19-24 | 17-21 | 30-38 | Fresh Breeze |
4-8 ft waves; many whitecaps; some spray | Small trees begin to sway; flags flap & ripple |
| 6 | 25-31 | 22-27 | 39-50 | Strong Breeze |
8-13 ft waves forming white caps everywhere; more spray | Large branches in motion; whistling heard in wires |
| 7 | 32-38 | 28-33 | 51-61 | Near Gale |
13-20 ft. waves; white foam blows in streaks | Whole trees in motion; resistance felt in walking against wind |
| 8 | 39-46 | 34-40 | 62-74 | Gale | 13-20 ft. waves; edges of crests begin to break; foam in streaks | Whole trees in motion; resistance felt in walking against wind |
| 9 | 47-54 | 41-47 | 75-86 | Strong Gale |
20 ft. waves; sea begins to roll; dense streaks of foam | Slight structural damage occurs; shingles blow from roofs |
| 10 | 55-63 | 48-55 | 87-101 | Storm | 20-30 ft. waves; white churning sea; rolling is heavy; reduced visibility | Trees broken or uprooted; considerable structural damage occurs |
| 11 | 64-74 | 56-63 | 102-120 | Violent Storm |
30-45 ft. waves; white foam patches | Widespread damage to trees & buildings |
| 12 | 75+ | 64+ | 120+ | Hurricane | 45 ft.+ waves; white sea; driving spray | Severe & extensive damage |
Buck-N-Blue Outdoors
P.O. Box 2121
Alvin, Texas 77512-2121
Tel.: 281-393-1100
Fax: 281-393-3100
For information, questions, quotes, contact J. Brau.