Tornado Winds

DOE-STD-1022-94

Track locations (longitude and latitude) with landfall locations,

Intensity,

Reported minimal central pressure near the coast or at landfall points,

Reported maximum wind speeds near the coast or at landfall point, and

Reported forward velocity and direction near the coast or at landfall point.

B. Systematic sources of data on hurricanes are available from the National Hurricane Center of Miami and

the National Severe Storm Center and the Meteorological Society of America.

5.2.2.3 Tornado Winds

C. Tornado winds are violently rotating winds which can reach speeds in excess of 320 km/hr (200 mph).

Midwestern states, especially Oklahoma and its neighboring states have the greatest number of historically

recorded tornadoes.

D. For sites containing facilities with SSCs in only Performance Category 1 or 2, tornado data need not be

considered. For sites containing facilities with SSCs in Performance Category 3 or 4, and for which no

up-to-date site-specific probabilistic tornado wind hazard analysis has been performed in accordance with

DOE-STD-1023-95, the following data shall be collected for tornadoes striking within 500 km (310 miles)

from the site:

Tornado track (latitude and longitude),

Intensity, and

Length and width.

C. Systematic sources of data on tornadoes are available from the National Severe Storms Forecast Center

and the National Oceanographic and Atmospheric Administration.

5.2.3 Precipitation and Snowfall Data

A. For sites containing facilities with SSCs in only Performance Category 1 or 2, it is sufficient to utilize

model building codes or national consensus standards, or rainfall intensity frequency-duration curves from

hydrometeorological reports from the National Weather Service.

B. For sites containing facilities with SSCs in Performance Category 3 or 4, and for which no up-to-date

site-specific probabilistic flood hazard analysis has been performed in accordance with

DOE-STD-1023-95; the following data shall be collected:

Monthly and annual summaries (including averages and extremes) of precipitation at or near the site.

Monthly and annual summaries (including averages and extremes) of snowfall and water contents at

or near the site.

5.3 HYDROLOGY

A. The sources of hydrologic hazard include stream flooding, flood runoff, flood drainage, dam failure, levee

or dike failure, storm surge, tsunami, seiche, wave action, volcano-induced hydrologic effects (e.g., rapid

snow pack melting, mudflows to cause dam failure and excessive siltation/sedimentation), and ground