Get ready for hotter temperatures, high fire danger to continue, and impacted air quality on the way for the rest of this week. High pressure building towards the West Coast from the Pacific will bring very hot temperatures and very dry conditions to most of our region this week, but there will be the chance that monsoonal moisture drawn into our region from the south kicks off some thunderstorm activity later this week. Skies are mostly clear of clouds this morning, but smoke is a different story. South winds early this week have helped air quality to improve in the valley, but it's still in the unhealthy to hazardous range in areas closest to our active fires. The biggest air quality impacts will be in areas around or north of the fires for the next several days. We'll have sunny skies and smoky conditions across northern California on Tuesday. Temperatures are starting out in the 60's to 70's in the valley and foothills, while mountain areas have mostly dipped into the 40's to 50's overnight. Winds are out of the northeast this morning, but will shift this afternoon. Valley areas can expect south winds to 10mph, while portions of the foothills and Sierra will have winds out of the west to 10mph. This will put the biggest impact from the Dixie Fire on the eastern side of the fire today. Humidity is projected to dip into the 10 to 20 percent range this afternoon. High temperatures are on the rise. Valley areas will top out in the 101 to 107 degree range, the foothills and Sierra will end up in the upper 80's to mid 90's, and the Northern Mountains will top out in the upper 90's to lower triple digits this afternoon. Fire danger will continue to be elevated with how hot and dry the conditions are, but the good news is winds will not be especially strong.
High pressure will continue to build into the West Coast over the next few days and that will result in hotter temperatures in your mid to late week forecast. We already have an Excessive Heat Warning set to go into effect from 1pm Tuesday through Saturday afternoon in western Siskiyou County. An Excessive Heat Watch has been issued for Trinity County and the Coastal Range from Wednesday afternoon through Thursday afternoon. We'll also have a Heat Advisory in effect from Wednesday afternoon through Thursday afternoon in eastern Siskiyou County and Modoc County. Temperatures will climb into the 100 to 108 degree range in the valley through this weekend, while mountain and foothill areas mostly top out in the 90's to lower triple digits from Wednesday through this weekend. There will be potential for isolated thunderstorms in the northern Sierra and southern Cascades from Thursday through Saturday as monsoonal moisture from the south is drawn north into our region. We'll also have partly cloudy skies across most of our region on Saturday, but skies will clear out on Sunday. Low pressure tracking towards the West Coast will bring a welcome dip in temperatures from the start to middle of next week. Most areas are currently projected to end up a few degrees below average by Tuesday, with temperatures staying around or just below average through the middle of next week.