The 'inside slider' will travel down the interior of California, limiting that amount of moisture that it could deliver in the southern half of the state
A storm out of the Gulf of Alaska will drop down the interior of California this week, bringing strong winds and much colder air to San Diego County by early Wednesday. But the “inside slider” system won’t deliver much rain.
“If the storm stayed offshore it would pick up more moisture, but that’s not going to happen,” said Brandt Maxwell, a forecaster at the National Weather Service. “This is like a training storm for winter.” Initial forecasts suggested that parts of inland San Diego County could get 0.7 inches to one inch of rain from early Wednesday through late Thursday. But Maxwell says much of the county will only get 0.25 inches of rain. Roughly one to two inches of snow could fall on the peaks of Mount Laguna and Palomar Mountain, starting Wednesday afternoon.Forecasters also say that the system will produce only modest rain in the Sierra Nevada, which feeds many of the state’s reservoirs.
The change in temperatures will be much more noticeable. San Diego’s daytime high will be 74 on Monday, which is Halloween. That’s normal for this time of year. Then things trail off. The high will be 69 on Tuesday, 65 on Wednesday, 62 on Thursday and 66 on Friday. The county’s inland valleys and foothills could be as much as 15 degrees below average by later in the week.
The weather service expects to post a wind advisory for Wednesday, when winds will blow 10 mph to 20 mph at the coast and 30 mph to 50 mph in some inland areas.