From the National Weather Service:
The National Weather Service in Reno has issued a flash flood watch through 10pm tonight for portions of California and Nevada including the following areas: the Lake Tahoe Basin, the eastern portions of Alpine, Sierra and Plumas Counties, the Surprise Valley and all of Lassen, Washoe, Storey, Carson City, Douglas and Lyon Counties.
* Strong thunderstorms with very heavy rainfall rates are likely to develop near the Sierra and parts of western Nevada by mid-afternoon then spread across northeast California and northwest Nevada through this evening.
* Recent wildfire burn scars and locations near steep terrain are prone to flash flooding and debris flows. Flooding of streets and intersections in urban areas with poor drainage may also
occur and impact the evening commute.
A flash flood watch means that flooding of small streams, creeks and other drainage areas is possible within the watch area. People in the watch area should monitor weather.gov/reno for
updates and be prepared for immediate action should heavy rains and flooding occur or a flash flood warning be issued.
From the National Weather Service