Mesocyclone Rapid Update - OB2 Requirement

Originally the mesocyclone product was generated following completion of
a volume scan of the WSR-88D radar. This new product will now be
generated after each elevation is scanned; the existing mesocyclone
product will also continue. Under current scan strategies the maximum
would be 14 elevations in 5 minutes. The product will differ from the
existing mesocyclone product in that it will be sent in a different
format and there will be additional attributes associated with the
identified mesocyclones. Also there will be a product for each tilt of
the volume scan.
Attributes include:
 associated storm id
 feature type
 max tangential shear
 height of max shear
 top height of mesocyclone
 azimuth of base
 range of base
 height of base
 azimuth diameter
 range diameter

The product is annotated with product name, date and time of volume
scan, and elevation angle.

Transmission format - Format of the data is detailed in the ICD.

Data Acquisition
This product may be received via the RPS list or one time request.
Entries for this new product must be added to the RPS list editor, One
Time Request, and Radar Multiple Request applications. Elevation
angle will be a parameter that must be specified for the MRU.

Display requirements
Two menu entries for MRU will be needed. One will overlay the highest
tilt available and automatically update the display as more recent tilts
arrive. A graphic overlay is generated from the data received. The
latest (highest) tilt is overlaid when MRU is loaded. As new updates
arrive (higher tilts from the same volume scan), the graphic is updated
on the display with the newly arrived information. A second menu entry
will allow the user to display the MRU for a particular elevation angle.
This will update when the same tilt becomes available during the
next volume scan. The graphics will differentiate between current and
extrapolated mesocyclone features, using special symbols to display
these features. These products should be displayable on the normal
scales used for individual WSR-88D radar products.

The graphic overlay is annotated with elevation angle, product name,
and date and time of the volume scan.

The alphanumeric table is also displayed with the graphic overlay on the
graphic screen. The contents of the table are similar to the existing
table with a few new additions. ASCII character "^" is used to indicate
updated values.

The text portion of the product is stored in the text database and can
be displayed on the text workstation.

Storage and Purging
Storage should be similar to the existing mesocyclone product. This is
a new product, and the old product will still be available. Sufficient
versions will be stored to allow overlay with other volume scan products
such as reflectivity and velocity. Since there is a product for each
tilt, there can be as many as 14 times the current number of versions.
The text portion of the product is stored in the text database.