Lightning and hazards
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Vaisala Lightning Explorer displays recent lightning activity across the entire continental U.S. The lightning data displayed is 20 minutes delayed and updated every 20 minutes. Get the latest map available by clicking "Refresh" under the map.
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Here you will find links to real-time and near real-time hazard maps that will keep you up-to-date on hazardous conditions throughout the Northeast and the US. Please click on the maps to visit the hosting agency's web site. There, you will find additional information and larger versions of the real-time hazard maps. If you have any questions, please don't hesitate to call us at (781) 224-9876 or email us at nesec@nesec.org . DISCLAIMER: Due to the nature of real-time information, many of these maps are experimental, use provisional or incomplete data, and are subject to significant changes over time. Users should check the accuracy, completeness, and fitness of these maps with the hosting agency before relying on them for mission-critical functions.
The National Lightning map shows where cloud-to-ground lightning strikes have occurred in the last hour. Lightning is an atmospheric discharge of electricity, which typically occurs during thunderstorms , and sometimes during volcanic eruptions or dust storms . In the atmospheric electrical discharge, a leader of a bolt of lightning can travel at speeds of 60,000 m/s, and can reach temperatures approaching 30,000°C (54,000°F), hot enough to fuse soil or sand into glass channels. There are over 16 million lightning storms every year. Lightning can also occur within the ash clouds from volcanic eruptions, or can be caused by violent forest fires which generate sufficient dust to create a static charge.