You may also be interested in the tornadohistoryproject.com for more information about Tornado history.
Visualization of Tornadoes
Twistery (Twister History) is a simple, free program to visualize the history of tornadoes in the United States. The program allows users to build their own maps of tornado activity in the continental United States.
The program provides the following data for all recorded tornadoes in the continental United States:
Users can filter the visualization by tornado attributes, date of occurrence or state. Users can also execute custom queries from the custom query pane. The custom queries allow users to specific the following:
Users may visualize the data as static images or as animations. The visualizations may be customized by changing visualization calculation factors and colors of static and dynamic content. Static images may be exported to popular image file formats for comparative analysis.
Data can also be presented by date, indicate month by each color:
The applications provides the following interface
elements for map navigation:
The following items can be modified by the user to enhance the emphasis of the visualization:
US Map: On, off, and color
The following items can be modified by the user
to enhance the visualization of tornadoes
The following items can be modified by the user to effect animation
Data is stored in an Access database and .Net datasets for fast execution. Data can be exported to shape files. Data can be imported from raw, comma delimited text files using the program's data import tool. Data is stored in a single access table, that maintains the data type and structure of the NOAA tornado archive. Standard , dynamically written SQL statements handle the insertion and selection of records.
Data is converted through a set of enumerations and lookup functions for human readability.
The use of a database allows the program to include user specified queries and the the "top queries" provided in the user interface.
Use: How to use the Tornado History Tool
Query Filters and Map Filters
There are two modes to filter and refine the visualization. Query filters, which effects the source data used for the visualization, and Map filters, that effect the display properties of the map. When changing map filters the user need only redisplay the map. When changing the query filters, the user must retrieve the new data.
Users can specify select from a set of predefined queries for the top injuries, deaths, damage, et al.
Uses can customize their queries by selecting the custom query from the queries drop down list.
|A view of the tornados that occurred in 1993 throughout the continental united states (origins only)||A view of the tornados that occurred in 1993 throughout the continental united states (tornado paths only)|
|1953 view of descruction caused by tornado events.||Midwest area tornado map indicating number of people wounded or killed by tornado.|
|A map of some of the tornados with some of the longest paths from 1955-1995.|
Alternative download locations
Click here to download Twistery Tornado History directly from the alternate mirror
Installer Here (24 mb)
Installation note: please install in the default director, c:\tornado to prevent problems. Thanks!