# What Is The Force Of Wind On A Flat Surface?

## How do you calculate wind speed and pressure?

Wind Speed Conversion (MPH) These values are calculated from the Ensewiler Formula, P = 0.00256 x V2, where V = Wind Velocity in MPH and P = the Differential Pressure across the window in Pounds per Square Foot (PSF)..

## What force is 50 mph wind?

How is wind speed measured?Wind ForceDescriptionkm/h6Strong Breeze38-497Near Gale50-618Gale62-749Strong Gale75-889 more rows•Jul 19, 2018

## How much wind is needed to lift a person?

“If you are a larger person, or a heavier person, it would take a lot more force to knock you off your feet,” Parker says. “For a person who weighs 100 pounds (45.3 kilograms), it would take a wind speed of 40 to 45 miles an hour, or tropical storm force, to move them.”

## What is basic wind speed?

Basic wind speed is the wind speed that is used in determining wind load on the solar structure. It is often in the form of maximum 3-second averaging wind speed for 300 return years at 33ft height above ground or maximum 10-minute averaging wind speed for 50 return years at 10m height above ground over the open field.

## Is 30 mph wind strong?

A Wind Advisory means that sustained winds of 30 mph for one hour and/or frequent gusts of at least 45 mph are occurring or expected within the next 36 hours. These winds will make it difficult to drive high profile vehicles. … Winds this strong may damage trees, power lines and small structures.

## Is 30 km wind strong?

30 to 39 km/h Small trees start to sway. 40 to 50 km/h Strong enough to break umbrellas and move large tree branches. 51 to 62 km/h Walking will be tough. … By 75 km/h, the wind is strong enough to damage structures.

## How do you calculate uplift?

In my book, uplift would be the difference between the actual and the anticipated, related to the anticipated. Assuming seasonality equally effects all markets (by multiplying by 2), the anticipated value of group A is 10, so lift is (5-10)/10=-0.5 (or -50%). For group B, (15-20)/20=-0.25 (or -25%).

## How do you calculate the force of wind on a surface?

Armed with pressure and drag data, you can find the wind load using the following formula: force = area x pressure x Cd. Using the example of a flat section of a structure, the area – or length x width – can be set to 1 square foot, resulting in a wind load of 1 x 25.6 x 2 = 51.2 psf for a 100-mph wind.

## What is the force of wind?

The speed and direction of the wind is governed by three forces; the pressure gradient force (PGF), the Coriolis Force and friction. PGF is the force produced by differences in barometric pressure between two locations and is responsible for the flow of air from an area of high pressure to an area of low pressure.

## How do you convert wind speed to force?

The mass of air hitting a surface then equals air density times area. The acceleration (a) equals the square of the wind speed in meters per second (m/s). Use the formula force (F) equals mass (m) times acceleration (a) to calculate the force in Newtons (N).

## How do you calculate wind uplift force?

Design wind-uplift pressures on roof sys- tems are determined based on a number of considerations, including a specific build- ing’s mean roof height and basic wind speed. The fundamental equation for determin- ing the design wind pressure in the field of a low-slope roof area is qh = 0.00256 (Kh)(Kzt)(Kd)(V2)(I).

## What force is 10 mph wind?

JetStream Max: Beaufort Wind Force ScaleBeaufort Wind ForceWind AverageSpeed Range00<1 kt <1 mph km h122 3 h1-3 1-3 1-5 h256 9 h4-6 4-7 6-11 h3910 16 h7-10 8-12 12-19 h14more rows

## How many mph is considered windy?

25 mphThe National Weather Service defines “breezy” and “windy” differently, winds 15 to 25 mph are considered “breezy” and above 25 mph are considered “windy.” The other challenge we run into with wind forecasts are the micro-climates we have across southern Idaho.

## What is the formula for wind speed?

Convert a wind speed measured in kilometers per hour to mph: Divide the kilometers per hour wind speed by 1.61 to get the wind speed in mph. If your wind speed is 161 kph, for example: 161 kph/1.61 = 100 mph.

## How much weight can 100 mph wind lift?

A 50 mph wind will apply 5 to 7 pounds of force per square foot, but this increases exponentially as winds get stronger. At 100 mph, that figure jumps from 20 to 28 pounds of pressure per square foot, and at 130 mph, 34 to 47 pounds per square foot of pressure are applied.