Description Usage Arguments Details Value Note References
View source: R/wind_conversions.R
Calculates the surface wind speed based on an estimated gradient wind speed at a point and the radius from the storm center to the grid point.
1 | gradient_to_surface(wind_gl_aa, cdist)
|
wind_gl_aa |
A numerical value with estimated gradient-level wind speed (m / s) at a grid point. |
cdist |
A numerical value with radius from the storm center to the grid point, in kilometers. |
The reduction factor is based on Figure 3 of Knaff et al., 2003. Over water, it is estimated to be 0.9 up to a radius of 100 km, 0.75 for a radius of 700 km or more, and decrease linearly between a radius of 100 km and 700 km. Points over land should use a reduction factor that is 20% lower. Because all of the counties are over land, the function makes this adjustment for all grid points.
A numeric vector with the estimated symmetric surface wind speed at the grid point, in meters / second.
This function is only appropriate to use for points that are over land.
Knaff JA, DeMaria M, Molenar DA, Sampson CR, and Seybold MG. 2011. An automated, objective, multiple-satellite-platform tropical cyclone surface wind speed analysis. Journal of Applied Meteorology and Climatology 50(10):2149-2166
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