These wind analyses depict the environmental flow in various oceanic
basins for selected tropospheric layer-means. Based on previous studies
(listed below), the depth of this layer is correlated with the TC steering
layer, and generally increases with increasing TC intensity
(Fig. 1). These layer-mean steering
fields are created by mass-weighting mandatory-level, high-resolution wind
analyses derived locally at UW-CIMSS using a three-dimensional recursive
filter technique. These analyses are strongly influenced by high-density,
multispectral satellite-derived wind information. Data from NWP global
models provide background field information for each analysis run.
This product has applications as a tool for approximating the current
and short-term environmental steering flow for tropical cyclones of
varying intensities in the Atlantic basin. By selecting the intensity
range for a TC of interest, plots of the best-correlated layer-mean
environmental steering flow can be displayed.
Velden, C.S.: The relationship between tropical cyclone motion, intensity
and the vertical extent of the environmental steering layer in the Atlantic
basin. 20th Conf. Hurr. and Trop Meteor., San Antonio, TX, May, 1993.
And for further information:
Velden, C.S., and L.M. Leslie: The relationship between tropical cyclone
intensity and the depth of the environmental steering layer in the
Australian region. 19th Conf. Hurr. Trop. Meteor., Miami, Fl, May, 1991.
Velden, C.S., and L.M. Leslie, 1991: The basic relationship between
tropical cyclone intensity and the depth of the environmental steering
layer in the Australian region. Wea. and Forecasting 6, 244-253.