Gusty winds and low humidity will result in critical fire danger conditions today and a Red Flag Warning is set to stay in place through 5pm Friday for the valley, foothills, and a portion of the Sierra. Trinity, Mendocino, and Siskiyou County areas will be under a Red Flag Warning for high fire danger through 11am Friday. We are also under a Wind Advisory in the valley through 8pm tonight. Sustained winds to 30mph out of the north will be possible today in the valley, and there is potential for gusts up to around 45mph. Winds will also be very strong tonight through early Friday in the foothills, and favorable canyons. Gusts up to 60mph out of the northeast will be possible in areas around the Feather River Canyon late tonight through mid day Friday. Very dry fuels, and humidity below 25 percent will also play a big role in fire danger today and Friday. We also are under a Freeze Warning for portions of Trinity and Siskiyou County areas through 8am this morning, and a Freeze Watch has been issued for the overnight hours in Plumas and Lassen Counties for late Thursday into Friday.
High pressure off the coast in the Pacific continues to interact with low pressure off to our east today and that is resulting in the strong wind even we're starting to see early Thursday. The good news is that temperatures will be several degrees cooler across our region this afternoon. Valley and foothill areas are starting out in the 50's to 60's, while mountain areas have mostly dipped into the high 20's to 40's overnight. The above mentioned winds will be the biggest issue for our region today, and will drive high to critical fire danger conditions through your Thursday and into at least early Friday. Sustained winds over 20mph are already being observed in the valley this morning, and gusts up to 45mph will be possible today. Humidity will dip into the 5 to 25 percent range this afternoon. High temperatures will mostly top out in the upper 70's to lower 80's in the valley, and in the 60's to 70's in the foothills and mountains this afternoon.
Winds will become stronger in the gaps and canyons of the Sierra Foothills tonight, and this will result in critical fire danger concerns through early Friday. Gusts up to 60mph are possible in areas surrounding the Feather River Canyon. Winds will start to diminish after mid morning on Friday, and we're expecting much lighter winds for the afternoon. Temperatures will end up a little cooler for the start of your Friday, but high temperatures will end up in the same range as Thursday. Lighter winds, and much cooler temperatures will then be ahead for your Saturday. Valley areas will mostly top out in the low to mid 70's, while foothill and mountain areas mostly end up in the 60's to around 70 degrees on Saturday afternoon. We'll end up a few degrees cooler on Sunday, but we will also start to see the next wind event ramping up as we head into Sunday night. This is currently expected to be the most substantial wind even we've seen this season, and will result in critical fire danger from Sunday afternoon through Monday. Gusts upwards of 60mph will be possible out of the northeast in the favorable gaps and canyons during this event. The biggest impacts are expected in the Sierra Foothills. Valley areas will also have stronger winds, but they are not expected to be as bad as today during this time. Valley temperatures will mostly end up in the low to mid 70's on Monday, while foothill and mountain areas top out in the 50's to 60's. Lighter winds and a modest warming trend will then return for the middle of next week. Please use extreme caution as you go about your business today as the winds will cause any fires that start to spread rapidly.