NEVADA CITY, Calif. June 4, 2009 - Lightning touched down a record 6,257 times in the 24-hour period ending at 6:00 a.m. on June 4, 2009. The Tahoe National Forest was hit 148, according to PIO Ann Westling. But, as evidenced by the map, lightning struck also in the lower areas of the foothills.
http://yubanet.com/regional/6-257-Lightning-Strikes-Hit-California---June-4.php