How to Find Wind Speed & Snow Using the ASCE and ATC Hazards Tools by Location Websites

The Applied Technology Council (ATC) offers site-specific information that is used in our calculators to determine wind velocity. For the best results, the address of the site may be used. To find your wind speed, follow the step-by-step guide below. 

Note:  Ground Snow Load can also be found in this tool, as well as Seismic information.

Step 1 ATC Hazards:
Navigate to https://hazards.atcouncil.org/#/

Step 2 ATC Hazards:
Enter your address, zip code, or city and state in the search bar and press the search button.

Step 3 ATC Hazards:
On the left side of the screen, check that the “wind” tab is selected.

Step 4 ATC Hazards:
Determine your wind speed based on your Risk Category. Wind speeds may differ depending on if ASCE 7-05, ASCE 7-10, or ASCE 7-16 is being used. If you are unsure, please check with an Engineering Express Technician.

Step 5 ATC Hazards:
Using the ASCE 7-10 definitions for Risk Categories I-IV:

1. • • Use Risk Category I for “buildings and other structures that represent a low risk to human life in the event of failure.” Such as
       Buildings and other structures that represent a low hazard to human life in the event of failure, including but not limited to Agricultural facilities, certain temporary facilities, minor storage facilities, fences, gates, etc.
     • Use Risk Category II for “all buildings and other structures except those listed in Risk Categories I, III, and IV.” Such as canopies or pergolas. Most Engineering Express calculators will ask for Risk Category II wind speeds.

   Use our design-aid calculators

   • To use Risk Category III, contact Engineering Express for a site-specific design. Use Risk Category III for “buildings and other structures, not included in Risk Category IV, with potential to cause a substantial economic impact and/or mass disruption of day-to-day civilian life in the event of failure; buildings and other structures not included in Risk Category IV (including, but not limited to, facilities that manufacture, process, handle, store, use, or dispose of such substances as hazardous fuels, hazardous chemicals, hazardous waste, or explosives) containing toxic or explosive substances where their quantity exceeds a threshold quantity established by the authority having jurisdiction and is sufficient to pose a threat to the public if released.”
   • To use Risk Category IV, contact Engineering Express for a site-specific design. Use Risk Category IV for “buildings and other structures designated as essential facilities; buildings and other structures, the failure of which could pose a substantial hazard to the community; buildings and other structures (including, but not limited to, facilities that manufacture process, handle, store, use, or dispose of such substances as hazardous fuels, hazardous chemicals, or hazardous waste) containing sufficient quantities of highly toxic substances where the quantity exceeds a threshold quantity established by the authority having jurisdiction to be dangerous to the public if released and is sufficient to pose a threat the public if released; or buildings and other structures required to maintain the functionality of other Risk Category IV structures.”