July 10, 2020 – Dry weather with seasonably hot temperatures for the next week.
Discussion
Other than a few high clouds arcing up into central California from off the coast, skies are clear across the region early this morning. Coastal profiler data indicate the marine layer is more shallow compared to 24 hours ago, and the Delta Breeze is not as strong as it was early Thursday. The result is that current temperatures are running about 5 degrees warmer this morning in the Delta Breeze influenced area from Sacramento down into the Delta. Elsewhere, current temperatures are only running about a degree or two milder compared to 24 hours ago.
An upper level ridge in the Desert Southwest will build and nudge westward through the weekend resulting in a warming and drying trend. Widespread triple digit heat is is forecast through the Central Valley with most areas expected to remain in the 100 to 105 range into early next week (around 5-10 degrees above average). Overnight lows in the Central Valley will mostly be in the 60s to lower 70s, so overall heat risk is expected to remain in the low to moderate category.
Locally breezy conditions are expected in the late afternoons and evenings into early next week. Combined with low daytime RH and locally poor overnight recovery, several hours of elevated fire weather concerns will be possible each day.
Extended Discussion (Tuesday through Friday)
Hot weather is going to continue into the extended period as a ridge sits to our east and a strong ridge to our west. This will keep moderate heat risk across much of the region and highs in much of the valley will be around 100 and as hot as 108 in the northern Sac Valley through Wednesday.
Troughing over the west coast will increase on Thursday as a short wave trough pushes through the Gulf of Alaska into BC. This will bring cooler temperatures and increased onshore flow especially through the Delta.