Category: Forecast

August 29, 2023 Summary  A warm and very dry air mass is in place and will maintain marginally above average temperatures through Wednesday then will peak Thursday. The freezing level is all the way up to 18,200 feet. At the surface, the marine layer remains near 1,100 feet. A significant cool down will begin Friday…

August 28, 2023 Summary  Water vapor satellite imagery well depicts the very dry air mass above California. Synoptically, there is a low pressure system spinning off the coast of the Pacific Northwest with a high center over the Desert Southwest and southern California. Currently, a dry west/northwest flow is evident above central California. The freezing…

August 26, 2023 Summary  Enough  modified marine air moved down the valley yesterday and overnight to keep temperatures in the low to mid 90s. There are two main features out there this morning. The first is a high center located over New Mexico and the second an upper low located over the Oregon/extreme northern California…

  August 25, 2023 Summary  A weak low pressure system off the California/Oregon coast has moved close enough to the coastline to deepen the marine layer. The latest sounding indicates the marine layer has deepened to 2,800 feet. That’s plenty deep enough to allow modified ocean air to move down the valley. The last observation…

August 23, 2023 Summary  A warm, humid air mass remains trapped in the valley following Hurricane Hilary’s passage. Temperatures in the low to  90s today and mid to upper 90s will be somewhat uncomfortable due to the high humidity. Two main players will govern our weather through the weekend. The first is a weak upper…

August 22, 2023 Summary  A relatively warm and humid air mass is now in place over the San Joaquin Valley. Temperatures will be sub 90 at most locations this afternoon. However, dew points will hang up there in the upper 60s, meaning temperatures may warm into the upper 80s but with a heat index making…

August 21, 2023 Summary  The following are storm totals as of roughly 4:00 this morning. Just as a broad brush, most locations in southern California received 2-4 inches of precipitation, 2-4 inches fell over the Kern County mountains, 3-5 inches over the Kern County deserts. Two remote locations in the mountains of LA county totaled…

August 20, 2023/pm Summary:  Tropical storm Hilary is located 330 miles south/southeast of LA at this hour. Hilary is moving to the northwest at a good clip at 25 mph. Maximum sustained winds are at 65mph. However, as I perused southern California during the morning hours, there were numerous gusts in the 60 to 79…

August 20, 2023 Summary  Rain is widespread over southern California at this hour. Most of the showers as of 6:00am were from the Kern County mountains south with scattered showers over central California. Hilary is still a minimal hurricane and will become a tropical storm later today as the center of circulation moves over San…

August 19, 2023/pm Summary:  Mid and high level clouds have advanced over the southern San Joaquin Valley as of midday. The deeper, rich tropical moisture had entered southern California. Already today, there have been flash flood warnings near the San Diego/Imperial County line and another warning over northern Imperial County and southern Riverside Counties. This…