WEATHER SUMMARY AND FORECAST DETAILS
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FOR 12/9/2019 - from Rogueweather
The fog and freezing fog that has been seen on both sides of the Cascades the last few mornings may make a reappearance tonight into Tuesday morning. It is expected right now that it will not be as widespread, or as dense. We are expecting a widespread lower cloud layer to develop that is likely going to help inhibit fog formation. On Tuesday the first of a series of fronts will be arriving. These systems will absolutely be directed much further north than anything we have seen since the pattern change happened right before Thanksgiving. Looking at the rainfall amounts expected over the next week, we see cumulative numbers that would be far more typical of a single storm in December. But, the projected 7 day rainfalls are still much better than anything we have seen since early October for Southern Oregon. Northern California looks to be on the drier southern end of the fronts coming, instead of being right in the cross hairs. Snow levels will be around 4000 to 5000 feet tomorrow as we see the parade of fronts begin. However, snow levels will be going up....way up through Friday afternoon. We expect them to be at least 7000 feet if not higher. So, no impact for travelers. But, also no help for the ski areas.....yet.
On Thursday we see a stronger front arriving. It is this system that is likely going to bring in the bulk of the rain and snow we see over the next week from Thursday through late in the day Friday. Snow levels will be high on Thursday holding up around 7000 feet or expected to. Snow levels will lower to near 5000 feet by Friday night. That gets it back to ski area levels. Then on Saturday during the day the snow levels are going to be dropping down to the 3000 to 4000 foot range. This is when we will see travel impacts developing. How much impact will depend on how heavy and frequent the showers are. Saturday night into Sunday morning we will see snow levels down to 2000 to 2500 feet. BUT! There is one major question out there. How much moisture will be left to generate any kind of significant snow accumulation? Right now it is not looking like much. Maybe an inch or two at most. If that is the case, not a big impact. And, at this point, not sure that the valley floors would see any kind of snow at all. Maybe snow flakes dancing in the air at times overnight Saturday into Sunday morning. This is something we are going to have to keep an eye on.
Looking out towards Sunday and Monday of next week, we see the next break arrive with ridging taking us into sunny weather. Well, except this also likely means the return of valley fog again at that time. There is almost no agreement in the forecast models as to how long this break lasts. But, if there is any consensus being seen, it is that the trend late in the week of 16th should see us turning active again. And the timing of that looks to land right about on the start of the Christmas Vacation period.
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