Heavy Rain in Nevada County, California

A COCORAHS (NV-WH-47 Truckee) located 1.0 mi NW of Glenshire-Devonshire, CA, and a CO-OP Observer (FARC1) located 2.0 mi NNW of Floriston, CA, reported 24 hour rainfall totals of 0.43, and 0.48 inches respectively.

A low that settled into the west coast the first few days of May brought showers and an increased chance (20-30%) of thunderstorms that also lowered rain-snow lines to 5500-7000 feet by early morning 3 May. Stronger showers and storms produced a mix of rain, snow, and ice pellets which lead to runoff issues in the lower elevations. High end chances (10-20%) of rainfall totals were expected to reach 0.50-1.00 inch. Although snow was projected to fall in the Sierra, the combination of warm road temperatures and the early May sun angle limited accumulations on paved surfaces. But bursts of convective heavy snow showers and/or snow occurring during the overnight hours were expected to bring overnight travel impacts to mountain passes. Tightening thermal and pressure gradients with the incoming low produced gusty south-southeast winds and travel impacts for portions of Churchill, Mineral, Lyon, and Mono Counties along US-395 and US-95.