1 / 27

Introduction to Lightning Data

Introduction to Lightning Data. 2009 Experimental Warning Program. Outline. Storm Electrification Background Lightning Mapping Array Products in AWIPS and Google Earth Feedback & Surveys. +. –. Storm Electrification (Noninductive Charging). Simplified storm charge structure.

werickson
Télécharger la présentation

Introduction to Lightning Data

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to Lightning Data 2009 Experimental Warning Program

  2. Outline • Storm Electrification Background • Lightning Mapping Array • Products in AWIPS and Google Earth • Feedback & Surveys EWP Spring Experiment 2009

  3. + – Storm Electrification (Noninductive Charging)

  4. Simplified storm charge structure • Dipole / Tripole : Normal / Inverted

  5. Simplified storm charge structure • In-cloud and Cloud-to-ground lightning: *Disclaimer: In reality, storm charge can be much more complex than a tripole

  6. Lightning and Updraft • Total lightning activity (In-cloud [IC] and cloud-to-ground [CG]; dominated by IC) is a natural precursor to microbursts and other severe weather at the ground • updraft size and strength noninductive charging: • (updraft drives storm electrification) • IC activity will precede CG activity; areas of greatest IC activity represent areas of greatest charge replenishment: at (or just downshear from) the updraft core NSSL Laboratory Review February 17-19, 2009

  7. Lightning Mapping Array (LMA) • Detects VHF radiation emitted as lightning propagates • Time-of-arrival technique to determine x,y, z, and t of VHF source point • We use a minimum detection by 6 stations to include a point (reduces noise) • Accuracy: x = 6-12 m; z = 20-30 m

  8. NLDN vs. LMA *NLDN: CG flashes Ground strike location only Gives polarity of flash *LMA: Maps points along flash IC and CG flashes Highest density of points corresponds with highest density of lightning NSSL Laboratory Review February 17-19, 2009

  9. NLDN vs. LMA *NLDN: CG flashes Ground strike location only Gives polarity of flash *LMA: Maps points along flash IC and CG flashes Highest density of points corresponds with highest density of lightning NSSL Laboratory Review February 17-19, 2009

  10. Animation of a lightning flash • VHF source points (3d) NSSL Laboratory Review February 17-19, 2009

  11. Animation of a lightning flash • VHF source points (3d) NSSL Laboratory Review February 17-19, 2009

  12. Oklahoma LMA • OKLMA • 11 stations; • spaced 10-22 km apart • First operational: May 1999 • Since 2001-2002

  13. Washington D.C. LMA • DC LMA • 10 Stations • Operational since 2007

  14. Northern Alabama LMA • NALMA • 10 stations • operational since Nov. 2001 NSSL Laboratory Review February 17-19, 2009

  15. LMA data in AWIPS

  16. LMA data in AWIPS

  17. Benefits of lightning data From Williams et al (1999) • Increased Situational Awareness, Confidence Limits • Rapid Update- Potential for increased lead time, reduced FAR • Identification of intensifying and weakening storms, potential severe storms, microburst wind shears, CG threat area • Fills gaps in radar coverage (e.g., edge of radar coverage)

  18. Linkage between storm strength and lightning • **Trends of total lightning (not just CG lightning) can give us clues to when a storm is increasing or decreasing in intensity** • (via noninductive charging) Total lightning CG only Courtesy Dennis Buechler

  19. Data in Google Earth • Will be examining trends of lightning sources for each cluster in GE. • Flash “Jump” often precedes severe weather at the ground • Keep in mind: • “Jump” may not always be associated with severe weather • Can see artifacts of storms moving from edge of network to the center (increased detection efficiency)

  20. Global Lightning Mapper (GOES-R) proxy data NSSL Laboratory Review February 17-19, 2009

  21. GLM proxy (AWIPS) NSSL Laboratory Review February 17-19, 2009

  22. Surveys and Feedback • Following an archive or real-time event forecasters will complete a survey evaluating the use of lightning data during that particular event. • Additional open feedback (comments, suggestions, criticisms) will occur during an event through the online EWP blog: • https://secure.nssl.noaa.gov/projects/ewp/blog/ NSSL Laboratory Review February 17-19, 2009

  23. Questions: • Contact: Kristin.Kuhlman@noaa.gov • Experimental Warning Program: • http://ewp.nssl.noaa.gov/ • Real-time LMA: • http://lightning.nmt.edu/oklma/ • http://branch.nsstc.nasa.gov/cgi-bin/LMAdp.pl • http://branch.nsstc.nasa.gov/PUBLIC/DCLMA NSSL Laboratory Review February 17-19, 2009

  24. NSSL Laboratory Review February 17-19, 2009

  25. NSSL Laboratory Review February 17-19, 2009

  26. Linkage between storm strength and lightning • **Trends of total lightning (not just CG lightning) can give us clues to when a storm is increasing or decreasing in intensity** (via noninductive charging)

  27. NSSL Laboratory Review February 17-19, 2009

More Related