![]() ![]() ![]() "Given that vast spatial coverage and high temporal resolution of the lightning mapper data collected by geostationary satellites, thunderstorm prediction can be significantly improved by utilizing such data in storm-scale numerical weather prediction models, especially over regions where operational weather radar observations are lacking, which is still the case in most countries," Prof. Credit: National Satellite Meteorological Center of China Meteorological Administration The paper further compares the performance of EnVar with those of EnKF and 3DVar (three-dimensional variational) methods, scrutinizing differences through single-observation experiments.įengyun-4 geostationary meteorological satellite, with China's first onboard lightning detector, was launched in 2016. The results show that the implementation of the EnVAR assimilation capabilities are successful, and positive impacts on the forecasting of a supercell thunderstorm are achieved with the assimilation of the lightning data. ![]() Xue's team developed an operational data assimilation system called the Gridpoint Statistical Interpolation (GSI), with capabilities to directly assimilate the GOES-R Geostationary Lightning Mapper (GLM) flash extent density (FED) data.Įxtending their earlier work developing and evaluating FED assimilation capabilities using the ensemble Kalman filter (EnKF) method within GSI, this paper published in AAS develops and tests FED assimilation capabilities using the hybrid ensemble-variational (EnVar) method which combines the strengths of EnKF and variational methods. Equipped with a lightning mapper capable of detecting and recording lightning flashes every 20 seconds, day and night, with high spatial resolutions across land and oceans, this satellite-derived information is invaluable in detecting rapidly developing thunderstorms. A geostationary satellite, stationary relative to the Earth over the equator, offers an extensive view spanning approximately 100 degrees in longitude, covering a large area between about 50 degrees North and South latitude. ![]()
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