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DTIC ADA108013: Gust Front Recognition Using a Single-Doppler Radar.
by Defense Technical Information Center
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A dual-Doppler analysis of a squall-line on 3 May 1977
yielded a three-dimensional wind field within what was
considered a typical squall line. This wind field was
highly divergent near the surface in the area of the
downdraft. Directly above this divergent flow, at a
height of 3 to 6 km, the flow became highly convergent,
with dry air entrainment observed along the backside of
the storm. The wind field above 6 km showed only small
areas of weak convergence. This lead to the conclusion
that the mid-level (3 to 6 km) air was the main source of
the downdraft air responsible for the strong surface
outflow. Based on the idea that the mid-level convergence
is an indication of a strong downdraft, the dual-Doppler
wind field was converted to radial wind fields as would
be viewed from various angles by a single-Doppler radar.
To be able to use this idea in real-time operations,
convergence values along each radial were computed
relative to the azimuth of the radar and direction of
storm motion. To further illustrate the possible use of
this convergence signature, single-Doppler data of three
thunderstorms known to have produced strong surface winds
were examined. In all three cases, a strong convergent
boundary was present in the mid-levels of the storm. This
research indicated mid-level convergence may be a
characteristic of thunderstorms which produce a strong
downdraft and subsequently strong outflow. By identifying
such a feature in the mid-levels of the storm, the
problems of warning on storms located at a distance in
excess of 100 km or storms with a gust front out ahead of
the precipitation would be eliminated.
Date Published: 2017-12-29 14:38:34
Identifier: DTIC_ADA108013
Item Size: 42951804
Language: english
Media Type: texts
# Topics
DTIC Archive; Mader,Michael William; ...
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