Risk Category I Buildings
Static Map
5 Wind speeds correspond to
approximately a 15% probability of
exceedance in 50 years. (Annual
Exceedance Probability = 0.00333,
MRI = 300 years).

Risk Category II Buildings
Static Map
5 Wind speeds correspond to
approximately a 7% probability of
exceedance in 50 years. (Annual
Exceedance Probability = 0.00143,
MRI = 700 years).

Risk Category III & IV Buildings
Static Map
5 Wind speeds correspond to
approximately a 3% probability of
exceedance in 50 years. (Annual
Exceedance Probability = 0.000588,
MRI = 1700 years).

 

 

 

BASIC WIND SPEED: 
The basic wind speed in miles per hour, for the development of wind loads, shall be determined from Figure1 1609 A, B, and C. The exact location of wind speed lines shall be established by local ordinance using recognized physical landmarks such as roads, canals, rivers and lake shores whenever possible. Because of the many wind speed lines of the multiple Risk Categories, there are not appropriate physical landmarks to provide an accurate and orderly reflection of these boundaries. To determine the applicable wind speed of a particular parcel, Palm Beach County has developed separate Geographic Information Systems (GIS) tools for each of the Risk Categories.

WIND-BORNE DEBRIS REGION: 
Areas within hurricane-prone regions located:

  1. Within 1 mile (1.61 km) of the coastal mean high water line where the ultimate design wind speed Vult is 130 mph (48 m/s) or greater; or
  2. In areas where the ultimate design wind speed Vult is 140 mph (53m/s) or greater. Linear interpolation between contours may not be utilized in the determination of the Wind Borne Debris Region. All of Unincorporated Palm Beach County is within the Wind Borne Debris Region.