Layer Thickness-
Vertical distance between two specific pressure levels in the atmosphere. Thickness is related to the mean temperature of a layer through the hydrostatic equation. The 1000-500 hPa thickness is often displayed on synoptic maps and forecast charts.
Lambert Conformal Conic projection-
This conic projection was designed by Lambert (1772) and has been used extensively for mapping of regions with predominantly east-west orientation, just like the Albers projection. Unlike the Albers projection, Lamberts conformal projection is not equal-area. The parallels are arcs of circles with a common origin, and meridians are the equally spaced radii of these circles. As with Albers projection, it is only the two standard parallels that are distortion-free.
Leapfrog differencing-
A finite-difference approximation to a time evolution equation in which the time derivative is approximated with values one time step before and one time step ahead of the values that specify other terms of the equation.
