Friday, 11 August 2000: 8:59 AM
Boundary layer development across Lake Michigan and the structure of
convection during a lake-effect snow event on 13 January 1998 are examined
with numerical simulations. This case was well documented by the Lake-
Induced Convection Experiment (Lake-ICE). The Advanced Regional Prediction Model (ARPS)
was used in a multiple-nested grid formulation. Both simulations and observations
indicate a shallow boundary layer of less than 400 m depth in the cold air upwind
of the lake. The boundary layer grew rapidly upon reaching the relatively warm water over the lake. Precipitating clouds
developed over the first 1/3 of the distance across the lake. Simulation results and
observations show a non-roll (cell or random) convective structure over the lake, changing
to a linear pattern as the cloud passed onshore over western Michigan. Comparisons
with observations will include ELDORA radar derived wind fields and convective
patterns and in-situ data from the NCAR Electra and University of Wyoming King
Air aircraft. Further simulation studies investigate influences of variations
in lake surface temperatures and presence of Lake Superior upwind on the development
and structure of the convection.
![](images/flag.png)
![](images/blue_ribbon.png)