500-mb heights and geostrophic winds derived from AMSU temperature soundings on 0000 UTC 17 December 2004.

Thursday, March 13, 2014

500-mb heights and geostrophic winds derived from AMSU temperature soundings on 0000 UTC 17 December 2004. Height contours every 60 m. Half wind barb represents 2.5 ms-1, full wind barb 5 ms-1 and a pennant 25 ms-1. The height field is derived from the AMSU temperature profiles by integrating the hydrostatic equation down toward the surface from 100 mb. The boundary condition at 100 mb is supplied from the GFS analysis. Once the height field is obtained, a balance condition is used to derive the wind field. Here the geostrophic balance is shown, but the linear and nonlinear balance winds are also computed.