Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

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. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

NWS Greenville-Spartanburg Criteria for Non-Precipitation Watches/Warnings/Advisories
Hazard Type	Watch/Warning Name Criteria	Advisory Name Criteria
Cold Weather
Heat	Excessive Heat Watch/Warning Heat Index 110 or greater	Heat Advisory Heat Index 105 or greater but less than 110
Wind (Non-Thunderstorm)	High Wind Watch/Warning Sustained winds higher than 40 mph and/or frequent gusts greater than 57 mph	Wind Advisory Sustained Winds of 31-40 mph, and/or frequent gusts of 46-57 mph
Frost Freeze	Freeze Watch/Warning Low temperature of 32 degrees or less during the Growing Season*	Frost Advisory Scattered to widespread frost is forecast during the Growing Season*
Fog	N/A	Dense Fog Advisory Fog causing widespread visibility of 1/4 mile or less