July 30, 2020 – Seasonably hot conditions are expected to continue across the region into the weekend with dry weather forecast to prevail.
Discussion
Slightly less hot weather is expected today as a shortwave trough brushes through northwestern California. Valley highs are expected to peak out in the upper 90s. Temperatures are already a little cooler this morning, especially north of I-80.
As expected, the Delta Breeze is increasing early this morning, too. At 3 am in Fairfield winds were 31 mph, gusting to 37 mph. The Fort Ord profiler shows the marine layer thickening to around 2000 feet. This isn’t thick enough to extend much eastward of Cordelia, so not expecting a stratus intrusion into the Valley this morning.
The area will remain between offshore longwave troughing and a building Four Corners ridge. NBM point viewer shows a small spread in temperatures into the weekend, so confidence is good for forecast.
Areas around I-80 southward will see cooling onshore flow continuing on Friday, while locations to the norther will see temperatures rising, reaching triple digits again around Redding. Saturday will see a little more warming. Sunday could trend a little cooler as the trough approaches the Pacific Northwest.
Extended Discussion (Monday through Thursday)
Ensembles continue to indicate a weak upper level trough moving through NorCal early next week, which will break down the high pressure over the area. Daytime temperatures are expected to hover right around seasonal normals next week with the Valley in the 90s to near 103 in the northern Sacramento Valley and mountains and foothills in the 70s to 90s. Onshore flow and associated Delta Breeze are likely to increase, keeping overnight temperatures mild in the Valley, especially near Delta influenced areas. Conditions will remain dry with no precipitation in sight.