Wind Load Maps

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IBC 2009 Wind Load Maps

IBC 2012/2015 Wind Load Maps

IBC 2018/2021 Wind Load Maps - Contiguous US, Alaska, & Puerto Rico

IBC 2018/2021 Wind Load Maps - Hawaii

IBC 2024 Wind Maps

 

IBC 2009 Wind Load Maps

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Basic Wind Speeds for Western U.S. Basic Wind Speeds for Eastern U.S. Basic Wind Speeds for Alaska, Hawaii, and U.S. Territories

 

Basic Wind Speeds for Western Gulf of Mexico Hurricane Coastline Basic Wind Speeds for Eastern Gulf of Mexico & Southeastern Hurricane Coastline Basic Wind Speeds for Mid & Northern Atlantic Hurricane Coastline
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.

 

IBC 2012/2015 Wind Load Maps

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Basic Wind Speeds for Risk Category I    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00333, MRI = 300 years).

 

   
Basic Wind Speeds for Risk Category II    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 7% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).

 

   
Basic Wind Speeds for Risk Category III & IV    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 3% probability of exceedance in 50 years (Annual Exceedance Probability = 0.000588, MRI = 1700 years).

 

 

 

IBC 2018/2021 Wind Load Maps - Contiguous US, Alaska, and Puerto Rico

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Basic Wind Speeds for Risk Category I    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00333, MRI = 300 years).
  6. Location-specific basic wind speeds shall be permitted to be determined using www.atcouncil.org/windspeed.

 

   
Basic Wind Speeds for Risk Category II    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 7% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).
  6. Location-specific basic wind speeds shall be permitted to be determined using www.atcouncil.org/windspeed.

 

   
Basic Wind Speeds for Risk Category III    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 3% probability of exceedance in 50 years (Annual Exceedance Probability = 0.000588, MRI = 1700 years).
  6. Location-specific basic wind speeds shall be permitted to be determined using www.atcouncil.org/windspeed.

 

   
Basic Wind Speeds for Risk Category IV    
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation between contours is permitted. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions.
  5. Wind speeds correspond to approximately a 1.6% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00033, MRI = 3000 years).
  6. Location-specific basic wind speeds shall be permitted to be determined using www.atcouncil.org/windspeed.

 

IBC 2018/2021 Wind Load Maps - Hawaii

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Basic Wind Speeds for Maui, Molokai, Lanai & Hawaii - Risk Category I Basic Wind Speeds for Oahu & Kauai - Risk Category I  
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C. Metric conversion: 1 mph = 0.45 m/s.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. It is permitted to use the standard values of Kzt of 1.0 and Kd as given in Table 26.6-1.
  5. Ocean promontories and local escarpments shall be examined for unusual wind conditions.
  6. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00333, MRI = 300 years).

 

 
Basic Wind Speeds for Maui, Molokai, Lanai & Hawaii - Risk Category II Basic Wind Speeds for Oahu & Kauai - Risk Category II  
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C. Metric conversion: 1 mph = 0.45 m/s.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. It is permitted to use the standard values of Kzt of 1.0 and Kd as given in Table 26.6-1.
  5. Ocean promontories and local escarpments shall be examined for unusual wind conditions.
  6. Wind speeds correspond to approximately a 7% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).

 

Basic Wind Speeds for Maui, Molokai, Lanai & Hawaii - Risk Category III Basic Wind Speeds for Oahu & Kauai - Risk Category III
  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C. Metric conversion: 1 mph = 0.45 m/s.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. It is permitted to use the standard values of Kzt of 1.0 and Kd as given in Table 26.6-1.
  5. Ocean promontories and local escarpments shall be examined for unusual wind conditions.
  6. Wind speeds correspond to approximately a 3% probability of exceedance in 50 years (Annual Exceedance Probability = 0.000588, MRI = 1700 years).

 

 
Basic Wind Speeds for Maui, Molokai, Lanai & Hawaii - Risk Category IV Basic Wind Speeds for Oahu & Kauai - Risk Category IV  

 

  1. Values are nominal design 3-s gust wind speeds in miles per hour (m/s) at 33 ft (10 m) above ground for Exposure Category C. Metric conversion: 1 mph = 0.45 m/s.
  2. Linear interpolation between contours is permitted.
  3. Islands and coastal areas outside the last contour shall use the last wind speed contour of the coastal area.
  4. It is permitted to use the standard values of Kzt of 1.0 and Kd as given in Table 26.6-1.
  5. Ocean promontories and local escarpments shall be examined for unusual wind conditions.
  6. Wind speeds correspond to approximately a 1.7% probability of exceedance in 50 years (Annual Exceedance Probability = 0.000333, MRI = 3000 years).

 

IBC 2024 Wind Maps

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Basic Wind Speeds for United States - Risk Category I    

 

  1. Values are 3 s gust wind speeds in mi/h (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation is permitted between contours. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Location-specific basic wind speeds shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  5. Wind speeds for Hawaii, US Virgin Islands, and Puerto Rico shall be determined from the ASCE Wind Design Geodatabase.
  6. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Site-specific values for selected special wind regions shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  7. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00333, MRI = 300 years).
  8. The ASCE Wind Design Geodatabase can be accessed at the ASCE 7 Hazard Tool (https://asce7hazardtool.online) or approved equivalent.

 

   
Basic Wind Speeds for United States - Risk Category II    

 

  1. Values are 3 s gust wind speeds in mi/h (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation is permitted between contours. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Location-specific basic wind speeds shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  5. Wind speeds for Hawaii, US Virgin Islands, and Puerto Rico shall be determined from the ASCE Wind Design Geodatabase.
  6. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Site-specific values for selected special wind regions shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  7. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00143, MRI = 700 years).
  8. The ASCE Wind Design Geodatabase can be accessed at the ASCE 7 Hazard Tool (https://asce7hazardtool.online) or approved equivalent.

 

   
Basic Wind Speeds for United States - Risk Category III    

 

  1. Values are 3 s gust wind speeds in mi/h (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation is permitted between contours. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Location-specific basic wind speeds shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  5. Wind speeds for Hawaii, US Virgin Islands, and Puerto Rico shall be determined from the ASCE Wind Design Geodatabase.
  6. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Site-specific values for selected special wind regions shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  7. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00588, MRI = 1,700 years).
  8. The ASCE Wind Design Geodatabase can be accessed at the ASCE 7 Hazard Tool (https://asce7hazardtool.online) or approved equivalent.

 

   
Basic Wind Speeds for United States - Risk Category IV    

 

  1. Values are 3 s gust wind speeds in mi/h (m/s) at 33 ft (10 m) above ground for Exposure Category C.
  2. Linear interpolation is permitted between contours. Point values are provided to aid with interpolation.
  3. Islands, coastal areas, and land boundaries outside the last contour shall use the last wind speed contour.
  4. Location-specific basic wind speeds shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  5. Wind speeds for Hawaii, US Virgin Islands, and Puerto Rico shall be determined from the ASCE Wind Design Geodatabase.
  6. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. Site-specific values for selected special wind regions shall be permitted to be determined using the ASCE Wind Design Geodatabase.
  7. Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (Annual Exceedance Probability = 0.00033, MRI = 3,000 years).
  8. The ASCE Wind Design Geodatabase can be accessed at the ASCE 7 Hazard Tool (https://asce7hazardtool.online) or approved equivalent.