20030816: nex2img, AP and clear-air mode

Gerry,

The radmode parameter will let you filter out clear air mode radars
but there is really no way to determine what information in a clear air 
modei or precip mode image is useful without other information.

For grids I am creating with gdradr, I filter out AP by masking
the radar echoes that are rain (not snow or ice) with the
echo tops greater than 5 (eg ignoring shallow precip).
This combines temperature grids from the RUC, as well as reflectivity and
echo tops NEXRAD products.

Steve Chiswell


>From: Gerry Creager N5JXS <address@hidden>
>Organization: Texas A&M University -- AATLT
>Keywords: 200308170348.h7H3mULd004990

>Is there any way to remove the AP/Clear-Air mode phantoms from Precip 
>Mode composites made with nex2img?  It's summer in Texas, and, well, you 
>can imagine how the composite usually looks in the evenings.  And with 
>some of the stagnating ridges, sometimes in the middle of the afternoon!
>
>When we get a real region of active precip, things start looking more 
>like a radar composite, but 'til they do, there's a lot of cruft to sort 
>through.
>
>Thanks, Gerry
>-- 
>Gerry Creager -- address@hidden
>Texas Mesonet -- AATLT, Texas A&M University   
>Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
>Page: 979.228.0173
>Office: 903A Eller Bldg, TAMU, College Station, TX 77843
>