The National Weather Service issued a weather alert at 6:57 p.m. on Sunday for strong thunderstorms in effect until 7:30 p.m. for the Greater Lake Tahoe Area. Wind gusts of up to 40 mph and pea-sized hail (0.25 inches) are expected. At 6:56 p.m., Doppler radar tracked a strong thunderstorm over Emerald Bay, or near South Lake Tahoe, moving east at 20 mph, the NWS Reno NV said.