SAN DIEGO — As we continued our break in-between systems, a weak ridge of high pressure lingered on Friday. Despite afternoon temperatures being a little warmer Wednesday through Friday, our daytime highs will remained below seasonal for this time of the year. An area of low pressure will move over the Pacific Northwest and create a dip in the jet stream over the West as it closes in on Southern California this weekend. This will reinforce cooler than usual temperatures.
Over the weekend, models show another low pressure system moving through the West. Previous model runs were showing heavier rainfall ahead of a cold front on Saturday. The latest runs have scaled back on the totals as this weakening system closes in on Southern California. The time frame for wet weather possible will remain Saturday afternoon/evening through early Sunday morning.
Why the change? The track of the low has changed. It will move more inland, away from the coast, and this will result in a lack of moisture.
POSSIBLE RAINFALL PROJECTIONS THIS WEEKEND:
- Coast, inland valleys and desert: 0.01" to 0.10"
- Mountains: up to 0.25"
Additionally, westerly winds will pick up over the weekend. Widespread wind gusts will be in the 20s and 30s, west of the mountains. Stronger winds across the mountains and desert are prompting a Wind Advisory for San Diego County mountains and desert starting Saturday morning.
SATURDAY TEMPERATURES:
Saturday morning will have a chill to it with overnight lows in the in the 40s and 50s. With overnight lows in the 30s along the foothills and in the mountains, expect the potential for patchy frost.
SEASONAL (AVERAGE) DAYTIME HIGHS:
- Coastal highs near 73 to 74 degrees
- Inland valley highs near 78 degrees
- Mountain highs near 65 degrees
- Desert highs near 85 degrees
AT THE COAST:
Elevated surf along our coastline is expected this weekend. For boaters, expect northwest winds 15 to 20 knots with gusts up to 25 knots.
FRIENDLY REMINDER ABOUT SUNDAY...
The low will exit into the start of next week. We could see an isolated showers before noon on Sunday. Expect drier conditions by the afternoon and evening hours.
Behind the storm system, an area of high pressure will move in over the Great Basin. This will trigger the return of Santa Ana winds in Southern California. Winds will be stronger north of San Diego County with strong gusts favoring the Inland Empire, Santa Ana and San Bernardino mountains and inland Orange County. High winds in the 40s and 50s will drive down humidity values into the teens and 20s.
For San Diego County, offshore north and northeast winds will be weaker with gusts in the 20s and 30s, especially across the inland valleys and mountains. With our dried out vegetation, fire weather concerns will be elevated inland.
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