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Update History
  • 2011 Jan. 3 Ver 1.0.0.0 (Minor update)Prompt message modified.

Introduction
  • This script needs only three dimensional wind field data to locate the TC center.

    (First, find the location of the maximum Relative Vorticity, then the location of the minimum wind speed nearby.)

  • With Consistency Check function. You can input the center lon./lat. of the previous time to reduce errors.

    (Using the previous TC center to find a maxi. Relative Vorticity nearby, avoiding center leap.)

  • Custom searching range.

Note: This script determines the center via wind field data only. So it might be wrong when the the circulation changed. (i.e. TC interacts with terrain or other weather systems.) Suitable for TCs before making landfall.
Usage
Please define the following variables in the script first:
  • Operation height (Variable: height , default value is 850hPa)
  • Range for consistency check (Variable: range, default value is 0.6 degrees in lon./lat.)
  • Range for finding minimum wind speed after the location of the maximum relative vorticity was found.(Variable: Increment, default value is 0.6 degrees in lon./lat.)
  • Split the searching range in how many times? (Variable: TotalSteps, default value is 10
Open your .ctl file after startup GrADS, then you can run this script. The following options will be asked:
  • Run for all time steps in this .ctl?
  • Perform consistency check or not?
  • If YES, you will be asked if you want to specify the center for the first time step or not. If YES, you have to enter the lon./lat. data.
  • Verbose mode?
  • Close the file after job done? (File Number 1)
A red cross will be placed on the location of the maximum relative vorticity; a cyclone symbol at the location of the minimum wind speed.
Licensing:
This software is licensed under the Creative Commons-GNU GPL version 2.0 or later. CC-GNU GPL
Download Version File size File format Released
Script
1.0.0.1 5.7 KB
.gs GrADS Script
2011 Jan.3
Operating System: Windows / Linux

Screenshots
Output Example
Output

Command Line
Command Line
inserted by FC2 system