NASA Goes On-Line With Extra-Tropical Storm Tracks

EARTH OBSERVATION

In this image the greatest frequency of extra-tropical storms (reds) can be seen to occur along the path of warm ocean currents that follow the eastern seaboards of North America and Asia. These warm, poleward-moving currents create a large temperature contrast with the cold winter-time continents and supply energy that helps generate and strengthen storm systems. Note that a similar pattern of storms circumnavigates the cold continent of Antarctica. The scale used for the frequency plots represents the percent of time that a low pressure center (i.e. a storm) was found over a give location during the period of examination - in this case the 90 days from December 1, 1981 to February 28, 1982. CREDIT: NASA Goddard Institute for Space Studies

Greenbelt - Feb 17, 2003
If you're a weather fanatic, or if you've just ever wondered how stormy it was around the world on the day you were born, you can now find out. Scientists working with NASA have created a free on-line atlas that shows extra-tropical storm tracks between 1961 and 1998.

"Although the atlas was originally developed for use by climatologists investigating the impact of global warming on storms, the images and data have also been used by fisheries, foreign meteorological services, researchers tracking historic storms, and by teachers and students," said Mark Chandler, a Columbia University geologist at NASA's Goddard Institute for Space Studies (GISS), New York City.

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.

TERRADAILY

Satellite Sees Double Zones Of Converging Tropical Winds

Greenbelt - Jul 16, 2002
NASA's QuikSCAT satellite has confirmed a 30-year old largely unproven theory that there are two areas near the equator where the winds converge year after year and drive ocean circulation south of the equator.

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