1. World-Wide Lightning-Location Network: WWLLN & Tropical-Cyclone Monitoring Natalia Solorzano Jeremy Thomas Robert Holzworth Reported by: Abram R. (“Abe”) Jacobson, ESS/UW (Earth & Space Sciences,University of Washington)

2. WWLLN – CG STROKE DETECTION EFFICIENCY Variation in the WWLLN CG stroke detection efficiency with NZLDN determined return stroke peak current for the old and new algorithms (Rodger et al., 2009) Variation in the WWLLN CG stroke detection efficiency with NZLDN determined return stroke peak current for the old and new algorithms (Rodger et al., 2009)

3. WLLNN location accuracy for Nargis Rodger et al., 2009

4. HURRICANE RITA – Category 5, Sept. 21 and 22, 2005 Max. intensity increase: Sept. 21, 2005

5. Similar results: Squires, 2006 EYEWALL LIGHTNING

6. Rita: max. intensity increase Sept. 21, 2005

7. Rita: Sept. 21, 14:00 – 15:00 UT Shao, 2005: 14- 15 UTC WWLLN 14-15 UTC

8. Hurricane Katrina – Category 5 Max. intensity increase: Aug. 28, 2005

9. Katrina EYEWALL LIGHTNING: Max. intensity increase: 08/28/2005

10. Katrina- 08/28/2005 Shao, 2005 – (1) 17:30 – 19:30 UT (2) 21:30 – 23:30 UT WWLLN:

11. Hurricane Wilma – Category 5 Max. intensity increase: 10/19/2005

12. Wilma – Eyewall lightning

13. Durian - Supertyphoon EYEWALL LIGHTNING

14. Typhoon – Supertyphoon Chanchu EYEWALL LIGHTNING Max. intensity increase: May 14, 2006

15. Similar results: Squires and Businger, 2008 using LR-NLDN WWLLN EYEWALL LIGHTNING (< 100 km from storm center)

16. Rita: max. intensity increase Sept. 21, 2005

17. NARGIS - APRIL 30, 2008

18. Nargis eyewall lightning (<100 km from storm center) and max. sustained winds

19. Apr 27, 21 Z Apr 28, 12 Z Apr 28, 18 Z Apr 29, 00 Z

20. Nargis eyewall lightning (<100 km from storm center) and max. sustained winds

21. Apr 29, 18 Z April 30, 17:30 Z May 01, 09:00 Z May 01, 23:00 Z Prior to intensifi cation Intens ification Weakening

22. NARGIS APRIL 30, 17:00 UT These lightning are pinpointing the region of active convection in the eyewall. This active convection area is not evident by examining only the infrared data, which show a large area of cold cloud-tops in the inner core. The subsequent rapid strengthening of Nargis was underestimated by forecasters who relied mostly on infrared satellite images and did not use lightning data.

23. TRMM IMAGES TRMM 85 GHz 18:31 Z METEOSAT IR 18 Z WWLLN 17:30-18:30 Z TRMM APR 30, 03 Z – Prior to MAIN INTENSIFICATION