All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 133 43 3
PDF Downloads 45 10 1

Initialization of a Modeled Convective Storm Using Doppler Radar–derived Fields

Ying LinDepartment of Meteorology, The Florida State University, Tallahassee, Florida

Search for other papers by Ying Lin in
Current site
Google Scholar
PubMed
Close
,
Peter S. RayDepartment of Meteorology, The Florida State University, Tallahassee, Florida

Search for other papers by Peter S. Ray in
Current site
Google Scholar
PubMed
Close
, and
Kenneth W. JohnsonSupercomputer Computations Research Institute, The Florida State University, Tallahassee, Florida

Search for other papers by Kenneth W. Johnson in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

A method is developed to initialize convective storm simulations with Doppler radar-derived fields. Input fields for initialization include velocity, rainwater derived from radar reflectivity, and pressure and temperature fields obtained through thermodynamic retrieval. A procedure has been developed to fill in missing wind data, followed by a variational adjustment to the filled wind field to minimize “shocks” that would otherwise cause the simulated fields to deteriorate rapidly.

A series of experiments using data from a simulated storm establishes the feasibility of the initialization method. Multiple-Doppler radar observations from the 20 May 1977 Del City tornadic storm are used for the initialization experiments. Simulation results are shown and compared to observations taken at a later time. The simulated storm shows good agreement with the subsequent observations, though the simulated storm appears to be evolving faster than observed. Possible reasons for the discrepancies are discussed.

Abstract

A method is developed to initialize convective storm simulations with Doppler radar-derived fields. Input fields for initialization include velocity, rainwater derived from radar reflectivity, and pressure and temperature fields obtained through thermodynamic retrieval. A procedure has been developed to fill in missing wind data, followed by a variational adjustment to the filled wind field to minimize “shocks” that would otherwise cause the simulated fields to deteriorate rapidly.

A series of experiments using data from a simulated storm establishes the feasibility of the initialization method. Multiple-Doppler radar observations from the 20 May 1977 Del City tornadic storm are used for the initialization experiments. Simulation results are shown and compared to observations taken at a later time. The simulated storm shows good agreement with the subsequent observations, though the simulated storm appears to be evolving faster than observed. Possible reasons for the discrepancies are discussed.

Save