It's going to be another good morning to throw on an extra layer as temperatures are brisk for the start of your Thursday. A Freeze Warning is in effect for the southern half of Trinity County, and a Frost Advisory is in effect for the northern half of Trinity County through 9am this morning. The low pressure that brought very active conditions to northern California on Wednesday is now tracking through to our east as we start out our Thursday morning. The threat of active weather has diminished as the low tracks east. Clear to mostly clear conditions are ahead for the start of your Thursday morning, but we will have some clouds increasing in our northwestern areas this afternoon. Temperatures are starting out in the 40's to 50's in the valley, 30's to 40's in the foothills, and upper 20's to lower 40's in our mountain zones this morning. Winds will be out of the south to around 10mph this afternoon, and humidity will dip back into the 16 to 23 percent range across most of our region. High temperatures are projected to end up in the mid 70's to around 80 degrees in the valley, low 60's to low 70's in the foothills, and upper 50's to upper 60's in our mountain zones on Thursday afternoon. Fire danger will be in the moderate range as winds stay light today.
The forecast for Friday through this weekend will be influence by low pressure off the coast in the Pacific and an area of high pressure building just off to our east in the 4 corners region. The low pressure approaching the West Coast will help to keep our high temperatures in check, and will bring a chance for showers to areas of the Northern Mountains into Shasta County on Friday. Temperatures are expected to end up just about as cool across our region on Friday morning, but our high temperatures will warm by a few degrees. Valley areas will top out in the 70's to lower 80's, while foothill and most mountain areas climb into the 60's to mid 70's.
The high pressure to our east will continue to build west this weekend, and that will result in dry weather and warming temperatures across northern California. Valley areas are projected to end up in the upper 80's to lower 90's both days this weekend, while foothill and mountain areas continue to top out in the upper 60's to lower 80's. Another chance for north valley and mountain showers will brush through our region from Sunday into Monday as the low pressure off the coast tries to move inland. Precipitation amounts will be very modest where we do get some showers, and there is not expected to be any thunderstorm activity on the way. Gusty south winds will also be possible from Sunday through early next week, and that will be a concern for fire danger.
High pressure continues to build into our region through the middle of next week, and that will leave us with hotter temperatures for the milddle to latter half of the week. Triple digit heat is expected to return to the valley on Wednesday and that could persist into next weekend. Foothill and mountain areas will mostly end up in the 80's to 90's for the middle to end of next week.