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 WAVETRAK - Product Description
Wavetrak mosaics are intended to be useful for tracking features such as tropical cyclones, tropical waves, and system interactions in tropical latitudes. There are 2 types of mosaics generated on a real-time basis in 6 hourly cycles.

1) Wavetrak with infrared satellite imagery and overlaid satellite derived low-level cloud drift winds:

-this product is generated utilizing geostationary infrared (11 microns) satellite imagery and overlaid satellite derived low-level cloud-drift winds. The cloud-drift winds are created by a combination of both visible and infrared imagery. In order to track the low- level circulations associated with tropical waves, only cloud-drift winds between 600-925 hPa are utilized in the mosaics.

2) Wavetrak with 850 hPa relative vorticity:

-this product depicts the low-level (850 hPa or ~5,000 ft) vorticity that is often associated with tropical waves, tropical cyclones, and synoptic scale features. NOGAPS model data is used as a first guess background field to stabilize each analysis. Satellite derived cloud-drift winds are then applied to this field, utilizing a recursive filtering technique. This technique allows for the satellite data to dominate the relative vorticity analysis. Values are color-enhanced and scaled to accommodate the circulation reversal that exists between the northern and southern hemispheres.

The Atlantic sectors of Wavetrak are covered by the GOES-10, GOES-12, METEOSAT-7 and METEOSAT-5 satellites.

The Pacific sectors of Wavetrak are comprised of coverage by the METEOSAT-5, GOES-9, and GOES-10 satellites.