Saturday night is expected to be the coldest night of the season! Klamath Falls broke their record low Friday night of -2 by 3 degrees, dropping to 5 below!!!! Heading into these evening I am almost certain they will break a record again! Many locations east of the Cascades will approach and surpass records, dropping into the negative teens by the morning. The Rogue Valley will drop into the lower 20′s, and I wouldn’t be surprised if Medford and surrounding locations see temperatures in the upper teens this late evening as well! Freezing fog will develop in the valleys overnight and because we already have been dealing with slick and icy roads from the past several days with snowfall, any melting that occurred this afternoon in addition with the freezing fog that will develop tonight will make impact the roadways again this evening and also the next several nights! Spots of ice and snow packed roads are being reported in many locations so please travel very carefully! My forecast low this evening in Klamath Falls is -8 and here as well as many other locations in the Basin will see morning wind chills approach the 15 below mark or lower. Wind chills in Siskiyou County will approach 5 below by the morning hours.
The deep trough that was bringing very cold afternoon and evening temperatures from our North into the Pacific Northwest will begin to shift eastward over the next day or so. Following it will be a ridge of high pressure which will bring plenty of sunshine for all areas heading into this next work week. Along with afternoon sunshine will come clearing evening skies and COLD overnight temperatures. Temperatures will remain in the 20′s in the Rogue Valley for the next several evenings. Fog is also a daily occurrence overnight when high pressure ridges build in so low visibilities and slick roadways will be a concern over the next week into the morning hours!
Because we will have one very vast area of high pressure sit over the region for an extended period of time, (through the entire week), air stagnation is something we need to be concerned about. Strong inversions will form at night in the valleys. This means that under clear skies, the surface will radiate and cool making temperatures rise with increased height rather than cool like we normally see. These inversions allow for pollutants, dust, grasses, etc. to get trapped in the lower levels near the surface and impact air quality! The point being, air quality will deteriorate as the days continue from here on out and an advisory may be issued by the National Weather Service as a result.
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Meteorologist Alyssa Caroprese