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Total lightning characteristics with respect to radar-derived mesocyclone strength
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stough, Sarah M. Carey, Lawrence D. Schultz, Christopher J. |
| Copyright Year | 2015 |
| Description | Recent work investigating the microphysical and kinematic relationship between a storm's updraft, its total lightning production, and manifestations of severe weather has resulted in development of tools for improved nowcasting of storm intensity. The total lightning jump algorithm, which identifies rapid increases in total lightning flash rate that often precede severe events, has shown particular potential to benefit warning operations. Maximizing this capability of total lightning and its operational implementation via the lightning jump may best be done through its fusion with radar and radarâderived intensity metrics. Identification of a mesocyclone, or quasiâsteady rotating updraft, in Doppler velocity is the predominant radarâinferred early indicator of severe potential in a convective storm. Fused lightningâradar tools that capitalize on the most robust intensity indicators would allow enhanced situational awareness for increased warning confidence. A foundational step toward such tools comes from a better understanding of the updraftâcentric relationship between intensification of total lightning production and mesocyclone development and strength. The work presented here utilizes a sample of supercell case studies representing a spectrum of severity. These storms are analyzed with respect to total lightning flash rate and the lightning jump alongside mesocyclone strength derived objectively from the National Severe Storms Laboratory (NSSL) Mesocyclone Detection Algorithm (MDA) and maximum azimuthal shear through a layer. Early results indicate that temporal similarities exist in the trends between total lightning flash rate and lowâ to midâlevel rotation in supercells. Other characteristics such as polarimetric signatures of rotation, flash size, and cloudâtoâground flash ratio are explored for added insight into the significance of these trends with respect to the updraft and related processes of severe weather production. |
| File Size | 113346 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150002889 |
| Archival Resource Key | ark:/13960/t3qv8j139 |
| Language | English |
| Publisher Date | 2015-01-04 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Meteorology And Climatology Vertical Air Currents Algorithms Azimuth Storms Meteorology Lightning Cyclones Polarimetry Doppler Radar Rotation Convection Nowcasting Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
