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Mesocyclone Rapid Update (MRU) Algorithm
This page is featured as a quick highlight to the
Mesocyclone Rapid Update (MRU) Algorithm.
Anyone who needs a more complete description of this product
should view pages 3-15 of
the RPG
Build 4 Preview document.
-
The MRU Algorithm is not a
new algorithm, but a new way of applying the legacy Mesocyclone
product
- Computed after each elevation scan, instead of
at the end of the volume scan
- Uses SCIT and Mesocyclone Algorithm output from
previous volume scan for identification and storm motion
- Any features in the current volume scan that match
extrapolated location of features in the previous scan will
inherit the attributes of the features from the previous scan,
including:
- Storm ID
- Feature Type (MESO, 3D SHR, or UNC SHR)
- Maximum tangential shear
- Radial and azimuthal diameter (DIAM RAD AZ) and height of the max
shear (HGT)
- Base azimuth, range (AZRAN) and height
- Top height
-
If the feature type and/or maximum tangential
shear increase in value, that feature will have a status
of Increasing (INC) and the feature type and/or the
maximum tangential shear will be denoted with a "^" symbol
in the MRU attribute table
- If the feature type and/or maximum tangential
shear does not increase
in value, that feature will have a status of Persistent
(PER)
- The feature status for any MESOs, 3D
SHRs, and UNC SHRs that do not have a match from the
previous volume scan will have a status of EXT until
a match is found
- If a new feature that cannot be matched
to a previous feature, its status is New (NEW)
- The MRU graphical product uses the same symbols as the legacy Mesocyclone
product
- Features with a status of INC, PER, or NEW will have a solid outline
- Features with a status of EXT will have a dashed outline
- The MRU Product is displayed by selecting a particular
elevation angle,
or by selecting the "latest MRU" option
- The MRU product has
a graphical attribute table, very similar to the legacy
Mesocyclone product, listing attribute information
for each identified MESO or
3D SHR
- The MRU Alphanumeric Product provides storm attribute
information similar to the graphic attribute table,
but for UNC SHR, also
- At the AWIPS text window, the product name is WSRMRUXXX,
where XXX is the radar identifier
- The features are displayed in
groups of ten and ordered by feature type
- Any feature value that has a "^" next to it indicates the value
has been updated with information from the current
volume scan
- A significant difference between the Highest Elevation MRU and the
Legacy Mesocyclone products is the Highest Elevation
MRU will not update information from the previous
volume scan that has decreased in value
- On both the One Time
Request and RPS
list windows,
OB 2 will give you the options to receive all elevation
angles of MRU, the lowest 'n' number of MRU, or a
selected MRU elevation angle
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