Note that when the wind speed maps were being developed for ASCE 7-98, the wind load factor at the time was equal to 1.53, which the wind load task committee rounded down to 1.5 and computed an ultimate load return period of 475 years, which subsequently rounded up to 500 years. The final wind speed map used in ASCE 7-98 was
The NWS produces products from the Terminal Doppler Weather Radar (TDWR) network, a Doppler Weather Radar network operated by the Federal Aviation Administration (FAA), which is used for the detection of wind shear, precipitation, and winds aloft near major U.S. airports.
As seen in the map above, vertical wind shear values towards the end of the 21st century (2070-2099) are expected to change compared to those seen during the end of the 20th century (1971-2000).
Deep-Layer Wind Shear - East Pacific - Latest Available - Large Scale: Product Grid; Basins Mouseover for list: Product Info: Time Step-3hr +3hr: Upper Level Winds: Lower Level Winds: Upper Divergence: Lower Convergence: Visible Winds: Wind Shear: Shear Tendency: 850mb Vorticity: 925mb Vorticity: 700mb Vorticity: 500mb Vorticity: 200mb ...
NWS wind advisories and warnings, which include Gale, Wind, High Wind, Lake Wind, Winter Storm, Blizzard, Ice Storm, Storm, and Blowing Dust are displayed at the surface. Small Craft warnings for wind will be added in the future. Figure 10: Winds Low Level Wind Shear
Thermal wind is a meteorological term not referring to an actual wind, but a difference in the geostrophic wind between two pressure levels p 1 and p 0, with p 1 < p 0; in essence, wind shear. It is only present in an atmosphere with horizontal changes in temperature (or in an ocean with horizontal gradients of density ), i.e. baroclinicity .
Jun 25, 2009 · Shear Variation in wind speed (speed shear) and/or direction (directional shear) over a short distance within the atmosphere. Shear usually refers to vertical wind shear, i.e., the change in wind with height, but the term also is used in Doppler radar to describe changes in radial velocity over short horizontal distances.
Dec 29, 2020 · disclaimer: this information is provided as guidance. it requires interpretation by hurricane specialists and should not be considered as a final product.