First, let me get to something that I feel I owe my long-time readers. I have been doing my blog for quite a number of years now, but of late, I know it has been more off than on. Thank you for being dedicated readers of my blog through the years. I will continue to update my blog for major weather events in the West., but I'm now spending more of my daily time consulting with, and writing news stories, for AccuWeather.com. These you can see by visiting your Local Forecast page (just put in your ZIP code at the top of the page). I will be here for you when the weather counts.
A building ridge of high pressure has increased temperatures across California and the interior Southwest today, and this heat is likely to peak this weekend. In fact, the hottest day is going to be Saturday in many locations from the Central Coast to southwest California while farther inland in the San Joaquin Valley to the desert Southwest Sunday will be as warm, or a tad warmer, than Saturday then tail off some early next week.
Here are some expected temperatures.
Napa Valley, East Bay Area: 92-98
Valleys of Southern California: 97-103
Central Valley: 99-104
Lower Deserts Southern California and Arizona: 104-109
The increase in heat and the decrease in moisture, along with already very dry vegetation, will bring a big increase to the fire danger this weekend.
A weak upper-level low developing off the central California coast Sunday and Monday will cause temperatures to lower some these days for all the coastal areas as well as coastal valleys then farther inland after that. Right now this low does not look like it will have much moisture with it, but areas over the mountains from the Sierra into southern California and Arizona might get a stray afternoon thundershower.
In the longer range, it looks like the weather will heat back up again late next week. In fact, it may get hotter than for inland areas of the coastal plain, the Central Valley and deserts than it will this weekend.
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.