The second inside slider of the week is moving through Southern California Wednesday night and will still affect parts of extreme southern California and southern Arizona Thursday.
The core of the storm will move through the LA Basin this evening continuing the showers of today and may even cause a thunderstorm in spots. Showers will increase in far southern California toward San Diego and the Low Deserts. While a compact storm, it is very cold and snow levels have been as low as 3,000 to 3,500 feet. Those low snow levels will continue tonight. This means portions of the Upper Deserts and all the mountains will have snow showers that will cause slippery travel. In the mountains, a few inches of additional snow can fall above 3,500 to 4,000 feet. In general, 2 to 5 inches of snow is likely above 4,000 feet especially on non-paved surfaces.
While it partially clears later tonight in Ventura, Los Angeles and Orange counties later tonight, a shower will linger even into tomorrow morning across San Diego County, anywhere in the mountains and also in portions of the Lower Deserts. Also some places in the deserts of southern Arizona will also get a couple of showers. Finally all the precipitation will mostly end Thursday afternoon.
In the wake of the low, gusty northeast winds will develop late tonight and tomorrow in the typical Santa Ana wind prone areas of southwest California with winds of 20 to 40 mph with the strongest winds probably tomorrow morning to midday.
As of the end of June there had been no named storms in the Eastern Pacific basin.
This is some serious and dangerous heat. Outdoor activity is just not at all recommended during the daytime.
A strong ridge of high pressure in the West brings the highest heat of the season so far to a large area.
Combine the cold with the wind and some precipitation and there is a real danger of hypothermia.
Any shower and thunderstorm can contain heavy downpours, heavy enough to cause temporary, low-lying ponding.
According to all long-range models, the warmest area in North America compared to average will be over the Northwest.