Be prepared for high to extreme fire danger across northern California today. Gusty north to east winds, low humidity, and record dry fuels are all combining to result in high to extreme fire danger conditions today, and Tuesday. The Red Flag Warning for high fire danger is set to stay in effect through 5pm Tuesday for the valley, foothills, a portion of the Sierr and the Northern Mountains. A Wind Advisory is also in effect through 11am this morning for the valley, foothills, and a portion of the Sierra. We also have a Hard Freeze Warning in effect for Trinity County through 9am this morning, and a Freeze Warning in effect for a portion of Siskiyou County through 9am as well. The biggest concern today will be the increased fire danger due to the dry and windy conditions. Sustained winds out of the north and east up to 35mph are possible today. Gusts in the 40 to 50mph range are also possible, with some stronger gusts in localized areas of the foothills, ridgetops, and canyons.
High pressure off the coast in the Pacific is keeping us dry, while an area of low pressure off to our east is keeping temperatures cooler today. These two areas are also driving our strong winds across our region today. Skies are clear to mostly clear this morning, and will stay mostly sunny through your Monday. Temperatures are starting out in the 40's to 50's in the valley, 30's to 40's in the foothills, and in the 20's to 40's in most mountain areas this morning. Sustained winds upwards of 20mph are still being reported for the start of your Monday in the valley, and gusts up to 40mph are still possible in the valley. Foothill and ridge winds up to 35mph out of the east are still possible early today, and gusts upwards of 50mph have been reported at the Colby Mountain weather station overnight. Winds are expected to start to subside after sunrise, but another round of gusty northeast winds is expected in the foothills and Sierra tonight. Humidity is mostly starting out below 30 percent this morning, and will dip into the 3 to 15 percent range this afternoon. High temperatures will top out in the low to mid 70's in the valley, mid to high 60's in the foothills, and in the 50's to low 70's in the mountains later today. The gusty winds, very low humidity, and record dry fuels are all keeping fire danger in the high to extreme range today.
Winds will start to diminish on Tuesday, but will still be strong enough to be a concern early Tuesday morning. The bigger issue through the day on Tuesday will be the very dry conditions. Temperatures will end up several degrees warmer than Monday on Tuesday afternoon as high pressure builds in from the Pacific. Valley areas will end up back in the low to mid 80's, while foothill and mountain areas mostly climb back into the 70's. Lighter winds and slightly cooler temperatures can be expected on Wednesday in the valley, but mountain areas may end up a little warmer than Tuesday afternoon. High pressure will dominate our region for the rest of this week. Valley areas will be sunny to mostly sunny with low 80's on Wednesday, and then stay mostly sunny with similar temperatures on Thursday. Mountain and foothill areas will mostly top out in the 70's. Overnight low temperatures will end up in the 40's for the valley and foothills, and in the 20's to 30's in the mountains through the week. You may want to throw an extra blanket on your bed.
Low pressure tracking through to our north will bring a modest drop in temperatures and parlty cloudy skies back into our region from Friday through your Halloween weekend. Valley temperatures will mostly be in the 70's to low 80's during that time, while foothill and mountain areas end up in the 60's to 70's. Halloween is Saturday, and conditions look comfortable and mild that day. Also, don't forget that Daylight Savings Time ends overnight Saturday into Sunday, so you'll need to remember to set those clocks back an hour late Saturday night.