NASA goes on-line with extra-tropical storm tracks

NASA goes on-line with extra-tropical storm tracks

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Scientists working with NASA have created a free on-line atlas that shows extra-tropical storm tracks between 1961 and 1998.
The on-line “Atlas of Extra-Tropical Cyclones 1961-1998” plots storm paths and statistics by tracking atmospheric low-pressure centers at sea level. The sea level pressures are calculated using data provided by the National Centers for Environmental Prediction and the National Center for Atmospheric Research (NCEP/NCAR) Reanalysis Project.
Fundamental information available about extra-tropical storm systems includes maps of storm frequency and intensity as well as plots of individual storms paths. In addition to the average intensity of storms over time, maps of the “most severe” storms are also calculated. The global maps include individual monthly and seasonal averages for the years 1961 through 1998 and all frequency and intensity maps are available as either rectangular maps or polar projections (which provides a view of the tracks from both north and south poles).
If a user chooses to download “Tracks,” a grayscale image of the world is presented showing the tracks of all storms for the entire period selected. Together, the images presented in this atlas describe the state of the mid- and high-latitude storm tracks during much of the latter half of the 20th century. In addition to images, the data is also available for download, along with an associated FORTRAN computer program. The program can be used to extract subsets of the database and places the information into report form. The reports identify how long a storm lasted, the latitude and longitude positions of storms at 12-hour intervals, the atmospheric pressure at the storm center (low pressure suggests a storm), as well as the day, month, year and time (Greenwich Mean Time).
Currently, NASA is working to update the Atlas to include data through the year 2001 as well as data for the year’s 1950 through 1960. A CD-ROM is also available, which includes GIF images of all frequency and intensity maps, and higher resolution postscript images of the grayscale “tracks” maps.