Jun 10, 2013 9:27 PM by Victoria Johnson
A weak low pressure system is expected to move through central California and should leave the state tonight. Thunderstorm activity associated with this system stayed just a few miles north of San Luis Obispo County, but it brought 10-20 degrees of cooling to the inland and mountain regions compared to one day ago. However, coastal areas are a few degrees warmer today due to the southeast flow, better clearing and a decrease in the marine layer. Night and early morning low clouds will be present this week. Maximum temperatures will be slightly below normal across the coasts and valleys. Interior sections will be slightly above normal due to the low moving out of the area and a ridge over Mexico expanding to the west. By Tuesday morning, the marine inversion should strengthen and clouds should linger later in the afternoon, resulting in a drop in temperature by a few degrees. The marine layer should shrink by about 1,500 feet, but the cloud coverage should push into the valleys and coastal slopes. High level clouds should increase late Tuesday night. Through Thursday, expect to see the ebb and flow of the marine layer, as the trough moves north, heights will lower and the interior temperatures will drop by a few degrees. Otherwise, near normal temperatures with night and morning clouds near the beaches will persist. By Saturday, there will be noticeable cooling and a deeper marine layer due to a low pressure system off the coast of Washington which may push the ridge over New Mexico eastward. There is a possibility of a warm up next week over the valleys and mountains.
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