#SATELLITE SPOTLIGHT: @NOAA's #GOES16🛰️ used its Geostationary Lightning Mapper (#GLM) to track the very intense #lightning associated with last night's #severe #thunderstorms across the Central U.S. Very high #instability likely contributed to the light show. #OKwx #TXwx #MOwx pic.twitter.com/NsSfujI5qT
— NOAA Satellites - Public Affairs (@NOAASatellitePA) April 29, 2020
A continuous mesoscale lightning flash (MSC) with a horizontal path length of approximately 100 km or greater.
The tremendous distances covered by megaflashes necessitate long flash durations as well, typically 5 s or greater.
These expansive flashes can produce one or more cloud-to-ground (CG) strikes along their paths.
Some CGs associated with megaflashes have large charge moment changes and/or peak currents resulting in lightning superbolts, sprites, and/or lightning-triggered upward lightning discharges (LTULs) from tall structures.
A World Meteorological Organization (WMO) committee of experts has established two new world records for the longest reported distance and the longest reported duration for a single lightning flash in, respectively, Brazil and Argentina
In June 2020 the World Meteorological Organization announced the certification of new global lightning extreme records for megaflashes after the identification of megaflashes in excess of 700 km in length and 16 s in duration over Argentina and southern Brazil.
Links :
- WP : Lightning Megaflash world record
- The Hearty Soul : World record lightning ‘megaflash’ in South America — 440 miles long — confirmed by scientists
- GeoGarage blog : How ships are protected from lightning – ships earthing ... / Do you know how ships are protected from lightning? / When it comes to lightning, don't pass the salt / Ship exhaust makes oceanic thunderstorms more intense / The first images from the new weather satellite just arrived, ...
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