presented by Roger
Wakimoto (NCAR/EOL and UCLA)
The term "bow echo" was first coined by
Fujita in 1978 to describe a radar signature that is often associated
with high winds or downbursts. Although it is now known to be one
of the most common modes of convective organization, it is surprising
to note that detailed observations of this echo-type are virtually
nonexistent. Most of our current understanding is based on numerical
simulations which have endeavored to document the processes that
produce the bow-shape and the damaging surface winds. The lack
of observations was one of the primary motivations for BAMEX (Bow
Echo and MCV Experiment) which occurred over the midwest during
a several week period in 2003.
A strong bow echo developed near Omaha, NE during the last day
of the experiment and was associated with damaging winds reaching
F1 in intensity. ELDORA intercepted the storm and was able to collect
high-resolution radar data during its most intense phase. Preliminary
results will be presented that show the evolution of the bow and
suggest how the high winds are produced.
Seminar is from 3:00pm to 4:00pm in FL2 Room 1022
on Wednesday, February 16, 2005.
|
