Triple degree heat for much of the Valley today and tomorrow, with lingering hot temperatures over the northern Sacramento Valley on Tuesday. Temperatures peak on Monday with Valley temperatures from 100-112 that afternoon. Slight cool down by the middle of next week.
Discussion
Early this morning, a shortwave trough was making its way across far northern California with few impacts besides some scattered clouds. This shortwave moves further inland today and lifts north early this afternoon allowing the Four Corner high pressure to build back into the area.
Temperatures this afternoon will be anywhere from 4 to 14 degrees warmer than the highs of Saturday, with widespread moderate heat risk expected for the Valley into portions of the foothills.
Temperatures peak on Monday which looks to be the warmest day of the week for many areas. Valley highs range from 100 to 112 degrees, while mountain temperatures will be in the 70s and 80s.
Warm overnight lows are also expected from the mid 70s to near 80 degrees, mainly focused in the thermal belts and northern Sacramento Valley Sunday and Monday night.
A Heat Advisory continues for much of the northern Sacramento Valley and surrounding foothills due to these conditions. Troughing redevelops over the northern Pacific on Tuesday, shifting the Four Corner high pressure further east. This will bring slight cooling to the area, although above average highs remain across much of NorCal that afternoon.
Some moisture looks to work its way northward Tuesday afternoon, however the best storm chances remain just east of our area. Troughing continues to deepen off the coast on Wednesday with even further cooling expected.
Extended Discussion (Thursday through Sunday)
Interior Northern California remains in between Four Corner high pressure and a developing trough off the West Coast on Thursday. Still much uncertainty in the amplitude of this troughing late week, but it will continue to bring onshore flow to the area through the weekend.
Monsoonal moisture continues to look south or east of the area and have kept the NBM forecast of no mountain thunderstorms at this time. Temperatures for the extended look about average for mid- July.