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Forecast for Sunday: 100% chance of rain and cooler temperatures

March 24, 2012 | 11:13 am

If ever there was a sure bet on the weather, Sunday would appear to be it.

"We have 100% chance of rain," said Todd Hall, a meteorologist with the National Weather Service.

Rain is expected throughout the day with a slight chance of thunderstorms in the afternoon, Hall said. The system will taper off to showers by afternoon or evening and clear out in time for the Monday commute.

Rain amounts will range from three-quarters of an inch to as much as three inches in some Southern California mountain areas. The storm, Hall said, will be dipping down from Alaska but will also incorporate some tropical moisture from the south.

Santa Barbara is expected to see the most rain, with the system weakening by the time it gets to San Diego. Southwest-facing mountain slopes in Malibu could see 1.5 inches.

Temperatures will be 10 to 20 degrees cooler than usual in the region, with some valley and coastal locations in the upper 50s to the mid-60s.

Last weekend's and this weekend's storms are expected to make a "significant dent" in the region's moisture needs during a fairly dry season, but "unfortunately we have a long ways to get caught up," Hall said. Downtown Los Angeles has had just shy of six inches of rain this water season, below the usual 13.23 inches.

Snow packs in the Sierra are also running very low, Hall said. The system expected to arrive on Sunday has the potential to bring in some much needed snow.


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