A potent disturbance will continue to drop through California today, bringing rain to the coast and the valleys while snow accumulates in the mountains and on the Grapevine.
The real trouble will occur across central and southern California as the disturbance drags a pool of cold air inland. This pool of cold air will cause snow levels to drop to between 3,000 and 3,500 feet in the Sierra Nevada Range.
Snow accumulations on the order of 3 to 6 inches are expected by this evening.
Motorists will face difficult travel along Interstate 80 through Donner Pass as the snow comes down hard for a few hours.
California Department of Transportation reports that chains are required on all vehicles, with four-wheel-drive vehicles with snow tires on all four wheels being the exception, traveling on I-80 from Kingvale to Donner Lake Interchange.
Rain and snow will continue to push farther south into Southern California through tonight, bringing a little rain to Los Angeles and San Diego. Rainfall totals across this region will average around one-quarter of an inch, which could lead to some slow travel along the Interstates.
Snow will fall in the mountains of Los Angeles and Ventura counties with snow levels dropping to about 4,000 feet.
This could cause dangerous travel conditions to develop along the Grapevine (Interstate 5).
Snow accumulations above 4,000 feet in these Southern California mountains are expected to average 1-3 inches with the potential for 6 inches above 5,000 feet.
In addition, gusty winds will howl out of the northwest later today throughout the Interstate 5 corridor and below passes and canyons. Wind gusts to 40-50 mph are possible and could create additional travel nightmares tonight.
This disturbance should finally shift south and east of California by Monday morning with much drier weather moving into the state behind it.
Another bout of stormy weather and a surge of cooler temperatures is likely toward the end of next week. Keep checking back with AccuWeather.com over the next few days for more information on potential travel delays across central and southern California.
Several storms will bring periods of rain and gusty winds to the west coast of the United States next week with the potential for one of these to reach Southern California.
This weekend will feel dramatically different from earlier this week in the northeastern United States as colder weather, and in some cases, a taste of winter with snow arrives.
Dry weather set to dominate the southern United States into November will only worsen the already extreme drought conditions.
The changing of the seasons will bring beneficial rainfall to northern Brazil, a region that has experienced severe drought over the past several years.
Rain will continue to cause travel delays and raise the risk of isolated flooding in parts of the northeastern United States and Atlantic Canada into Saturday evening.
Damaging storms pounded the Pacific Northwest, while two powerful typhoons struck the Philippines within a four-day span.
Temperature reached 104 degrees at San Diego (record for date). Record for date 100 degrees at Los Angeles (downtown). Climax of heat wave of record duration in Southern California.
Ottawa, Canada (1988)
Record October snowstorm brings 21 cm (just over 8 inches).
Hurricane Juan kills more than 200 and results in $1.5 billion in damages.