An upper level center of low pressure has been sitting off the coast for a few days now, and this is the main culprit for the humid and hot afternoons we’ve been having. The low is now on it’s way out of our region slowly tracking north and east. Models have the low pushing into Canada by Tuesday morning. as it leaves, high pressure that has been sitting over the four corners will retrograde northwest into Northern California and Southern Oregon.
The hot air that is sitting over this region will advect into our region Monday and Tuesday. In addition, a thermal trough will move inland. Therefore, we will be seeing the triple digits once again in most locations. The axis of this ridge is expected Tuesday afternoon, making that the warmest day of the week; and quite possibly the warmest of the year, so far. Records will once again be challenged with this heat. In fact, Sunday afternoon, Mount Shasta City recorded it’s highest July 13th temperature of 99. This surpassed the old record of 97, set back in 1987.
This ridge will break down starting Tuesday evening, and temperatures will slowly start cooling down. The triple digits are expected to continue until Thursday for Medford, but will eventually drop back down to a little above average by the weekend. As the ridge flattens down, a shortwave will enter the region and allow for a chance of isolated thunderstorms in Northern California, and possibly the Klamath Basin. Activity will not be as prevalent as the past few days, but dry lightning, hail, and gusty winds are not out of the question.
Thanks for logging on and enjoy your workweek!
Meteorologist Seth Phillips
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