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This layer represents the total number of historic flash flood record sites with recorded (non-zero) monetary damages or fatalities located. |
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This layer represents the total number of historic flash flood record sites with recorded (non-zero) monetary damages or fatalities located. |
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This data was generated by AtkinsRéalis, using the National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) Storm Events Database (SED). Downloaded February 2026. |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>When severe weather occurs in the United States, there are networks of humans and sensors that observe and report the events and their details to the National Weather Service. These storm reports are aggregated and archived by NOAA's National Centers for Environmental Information. With over 1.9 million records over 70 years, the Storm Events Database is the most comprehensive, official record of severe weather in the U.S. </SPAN></P><P><SPAN /></P><P><SPAN>Not all event types are archived over the entire period. For example, events besides tornado, thunderstorm, wind, and hail begin in 1996.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>NOAA SED data is provided in point location format, historic flash flooding events may extend beyond the pixels identified as containing the NOAA SED point.</SPAN></P><P><SPAN>The FFRA is provided for the 30-county area at a spatial resolution of 1-kilometer by 1-kilometer for better computational efficiency as well as to align with input data with the coarsest resolution among those that were used in this study. In addition, the selection of the 1-kilometer by 1-kilometer pixel grid for processing FFRA can avoid confusion about the intent of the product – a finer resolution may give a false impression about the precision or intent of this study. This study is not intended to site sirens as part of outdoor warning siren systems but to identify flash flood-prone areas that warrant sirens. FFRA with a resolution of 1x1 kilometer can adequately serve as foundational information for identifying flash flood-prone areas that warrant sirens given the audible radius for outdoor warning sirens typically ranging from approximately 1 to 2 miles.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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| title:
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NOAA Storm Events Database |
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| tags:
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["weather","severe weather","storm","thunderstorm","wing","hail","disaster","tornado","flood","NOAA","NCEI"] |
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en-US |
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150000000 |
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