Wind Speed

The purpose of the “Wind Speed Web Site” is to provide users with a site specific wind speed using the GPS coordinate system. On this website, users can retrieve wind speeds from ASCE 7-10, ASCE 7-05 and ASCE 7-93. Wind speeds are also provided for serviceability purposes for 10, 25, 50 and 100-year return periods.

The reason this utility is needed is that the spatial resolution of the wind speed maps that are displayed in ASCE 7 are not sufficient to determine a site specific wind speed. There are no reference city or town locations on the ASCE 7 maps and while county boundaries are shown, the resolution is affected when the maps are expanded large enough to distinguish the boundaries and approximate the city locations.


To find the windspeed for a specific area, select one of the following methods:

  1. Click the radio button for decimals and enter latitude and longitude in the spaces in decimal form and select “Get Windspeed” or

  2. Click the radio button for address and enter the desired address; Select “Find” to auto-populate the latitude and longitude and select “Get Windspeed” or

  3. Find the site on the map, right click the mouse and the latitude and longitude will be displayed in decimals. The coordinates auto-populate in the decimal location. Select “Get Windspeed” or

  4. If your site is in the US Virgin Islands, Guam, American Samoa or Hawaii, click the appropriate radio button below and select “Get Windspeed”.

  5. If you are unsure of the location use the “Lat/Long Finder” tab at the top of the page to enter an address and retrieve a latitude and longitude.

Windspeeds are site-specific for the GPS coordinates provided and are found by interpolation to the nearest 1-mph.

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