WEATHER SUMMARY AND FORECAST DETAILS
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For 11/18/2020 - from Medford NWS
Active weather continues this morning. Upper level troughing remains over the region and shortwaves moving into the area will maintain wet conditions today and Thursday. The first shortwave is currently moving into the area, bringing numerous showers west of the Cascades and in northern California along with some gusty winds along the coast and across the higher terrain. 700 mb flow of 40 to 50 knots will move through the area today, and this has prompted a Wind Advisory for portions of the East Side. It will be breezy across much of the forecast area today, but especially so for the typically windy places across the East Side like Summer Lake where winds of 20 to 30 mph with gusts to 50 are expected later this morning and afternoon. In addition to breezy winds, we`ll see some winter impacts along the Cascades today, especially for areas from Crater Lake northward. Precipitation will increase across the area later this morning and afternoon, however, snow levels will hover around 4500-5000 ft so impacts are expected to be limited to the higher passes above 5000 ft. A Winter Weather Advisory is in place for the Cascades for areas from Crater Lake northward.
A second shortwave follows quickly on the heels of the current one, and this will reinvigorate showers across the area late tonight into Thursday morning. Winds will be much weaker with this next shortwave, however, snow levels will lower tonight down to around 3500-4000 ft. Considering that precipitation amounts will be less overall, snow impacts down to 3500-4000 ft are expected to be minimal with only light accumulations expected, including Siskiyou Summit, late tonight into Thursday morning. The Cascades, however, don`t catch much of a break between the two shortwaves and this is where we expect impacts to continue. As such, the Winter Weather Advisory will continue through this second shortwave into Thursday morning. As we head into Thursday afternoon, showers will come to an end and drier air and a brief period of ridging move into the region. This will bring a break in the weather Thursday evening through at least Saturday. During this time, expect valley fog/freezing fog during the overnight and morning periods. Fog and low clouds may linger into the afternoon hours for some locations, leading to some chilly days. The pattern turns active again late this weekend with the next front expected late Saturday night into Sunday. Multiple fronts are expected to pass through the area through the start of next week. None of these fronts look particularly strong at this time and snow levels look to remain around 5000-6000 ft. We`ll continue to monitor this as we head into the holiday week.
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