"20-foot winds" refers to the sustained wind speed measured at a height of 20 feet (about 6 meters) above the ground, typically above surrounding vegetation like trees or crops, and averaged over a 10-minute period, common in fire weather forecasting. This measurement accounts for the friction and shielding from obstacles that slow wind near the surface, giving a more accurate idea of fire behavior or general conditions than ground-level readings.
The adjustment values are typically applied to the 20-foot windspeed, which is the speed that is measured 20 feet above any fuel or obstruction, usually by a weather station. The midflame windspeed is obtained by multiplying the 20-foot windspeed by the appropriate wind adjustment factor from the table.
20 mph winds are generally considered safe for driving all types of vehicles. Light vehicles or motorcycles may start to feel a push or pull from the wind, especially when driving in open areas where wind gusts tend to be stronger.
Yes, deer will move in 20 mph winds, but their behavior changes significantly; they often become more cautious and stay in thicker cover, but bucks might move more, especially during the rut, while does are generally more skittish as wind impairs their senses, so expect subdued activity or movement to sheltered areas like ravines where they feel safer.
So, for those of you in windy areas, we evaluated several vehicles that are well-designed in terms of aerodynamics, and we have identified the Audi A6, BMW-i8, Mazda3, Mercedes Benz B-class, and Nissan GT-R as the best used vehicles for people who live in windy areas.
It takes very strong winds, typically over 100 mph (160 km/h), often in tornadoes or hurricanes, to flip a standard car, but factors like a vehicle's height (SUVs/vans are more vulnerable), weight, and being empty significantly lower the threshold, with some tall vehicles potentially tipping in gusts as low as 60-75 mph, especially when driving. For reference, winds of 86-110 mph can push cars off roads, while higher speeds (111+ mph) can lift them.
The "123 rule driving" refers to the 3-Second Rule, a safety guideline for maintaining a safe following distance by counting three seconds (e.g., "one-one thousand, two-one thousand, three-one thousand") after the car in front passes a fixed object; if you pass the same object before finishing the count, you're too close. This provides vital reaction time, though it should be increased to 4-6 seconds in poor weather or when following large vehicles.
Sustained wind speeds around 20 mph, or frequent gusts of 25 to 30 mph. " No Discernable Threat to Life and Property from High Wind." The sustain wind speeds are non-threatening; "breezy" conditions may still be present. Note: In "High Wind" conditions, small branches break off trees and loose objects are blown about.
The strongest wind ever recorded on Earth, excluding tornadoes, was 253 mph (408 km/h) during Tropical Cyclone Olivia at Barrow Island, Australia, on April 10, 1996, measured by an automated station. For manned stations, the record is 231 mph (372 km/h) from Mount Washington, New Hampshire, on April 12, 1934. Tornadoes have likely seen even faster winds, with estimates over 300 mph, but direct measurements are harder.
There is no single maximum wind limit as it depends on the direction of wind and phase of flight. A crosswind above about 40mph and tailwind above 10mph can start to cause problems and stop commercial jets taking off and landing.
"Strong Gale Warnings" are issued if winds of Beaufort force 9 or frequent gusts of at least 52 knots are expected. "Storm Force Warnings" are issued if Beaufort force 10 or frequent gusts of at least 61 knots are expected.
Fresh breeze at 29-38 kph (19-24 mph). Small trees sway; whitecaps form on waves. 6. Strong breeze at 39-49 kph (25-31 mph).
The risk of pedestrian fatality increases rapidly after 20 mph. At an impact speed of 30 mph, the risk of fatality is 20%, at 40 mph the risk of fatality is 46%, at 50 mph the risk of fatality is 75%, and at 60 mph the risk of fatality is almost certain, at 92% (Tefft 2013 ).
High Center of Gravity
Vehicles that sit higher off the ground like SUVs, pickup trucks, and vans are more likely to roll over. Light trucks have a much higher rollover rate than sedans. Adding passengers or heavy cargo raises the center of gravity even more.
Sedans are the vehicle type most often involved in accidents simply because they are the most common on the road. Motorcycles, however, carry the highest risk, as riders are far more likely to suffer severe or fatal injuries in a crash.
Yes, hurricanes have reached 200 mph, most notably Hurricane Patricia (2015) in the Eastern Pacific, which hit 200-215 mph sustained winds (with higher gusts) and is the strongest in the Western Hemisphere, and other storms like Hurricane Camille (1969) also neared this intensity, with some gusts over 200 mph recorded, though measurements in extreme events can vary.