Weather, weather, weather

According to the National Weather Service, there is a heavy rainfall and flooding threat in California; heavy snow in the Sierra Nevada Mountains.

A strong atmospheric river will bring heavy rainfall to California through the holiday week.

The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible, as well as mudslides and rockslides in the mountains. A heavy snowfall event will impact the Sierra Nevada mountains through this week, with several feet of snow expected.

Moisture and upper-level impulses from the Pacific will stream eastward over the Pacific Northwest/Northern California, ahead of a front moving onshore over the West Coast by Wednesday morning. The system will produce rain and higher elevation snow over parts of the Pacific Northwest and the Northern Intermountain Region.

Also, on Tuesday, a broad plume of moisture will move over California, with rain moving into Southern California and the Great Basin overnight.

Two areas of heavy rain will develop over Northern/Central California and over Southern California. Therefore, the Weather Prediction Center has issued a Slight Risk (level 2/4) of excessive rainfall over parts of Northern/Central California and Southern California through Wednesday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams and burn scars being the most vulnerable.

Heavy snow will develop over the Sierra Nevada Mountains through Thursday.

Additionally, a Slight Risk of excessive rainfall will develop over Northern/Central California and into parts of Southern Nevada on Wednesday.