Notes on the Western U.S. Ingredients Maps
When applying the ingredients-based methodology in the western U.S., there
are a few notable differences in the areas with topography. First, an additional
forcing mechanism, orographic lifting, must be considered. As a preliminary
attempt to provide some guidance in diagnosing this element of the forcing
ingredient, forecasted wind barbs are included on the top left panel of the
ingredients maps. An
assessment of orographic lifting can be based on the magnitude and direction
of the wind relative to the orographic features.
Secondly, the 800:850 mb ingredients map may be too near to the surface or
underground in certain areas of the west. Therefore, this map should be disregarded
in the higher elevation regions. An additional 500:550mb map has been included
to provide more information for these regions.
Please note that this expansion of the ingredients to the west is a preliminary
experiment only. I am making the maps available for western forecasters to
begin to investigate the behavior of the ingredients.
Please let me know if you have any suggestions or observations.