The Iowa State University Department of Geological and Atmospheric Sciences maintains an extensive archive of meteorological data, including textual information (severe weather statements and other National Weather Service products), numerical model output in gempak format, gif images of weather maps created daily since 2006, and gempak-format surface and upper air data going back to 1933, much of which was provided to us by NOAA's National Severe Storms Laboratory. For the past year or two, we have made NMQ estimates of precipitation available on the archive as well.
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