Our region will experience extreme weather changes in the coming week.
Yes… the forecast is still cold and snowy. But before enjoying the snowflakes, we will experience strong atmospheric river that will bring a lot of rain to the mountains.
And to spice it up, strong winds and an unusual rain will appear over the country of Puget Sound.
First, the atmospheric river. As shown below, a blast of wind-driven moisture, thousands of miles long, will push into our region on Friday. This figure shows integrated steam transport – essentially the amount of water vapor being transported by the wind. Let me assure you, these are great values.
The huge stream of water vapor would be pushed upwards by the mountains in our region, creating intense rainfall. Here are the total projections for the 24 hours ending 5 p.m. Friday. OH. A substantial area over 5 inches in both the Olympics and the Cascades.
As with most atmospheric rivers, temperatures will be warm, with freezing rising to around 6500 ft on Friday (sorry skiers). Note that snow levels are typically about 1000 ft below freezing. The higher altitudes will be blown away by the snow. And the amount of snow will drop quickly on Saturday.
Heavy rain will essentially raise river levels, with the Snoqualmie River reaching flood stage (see forecast for the Snoqualmie River in Carnations provided by the NOAA/NWS River Forecast Center in Portland) /
And then there will be wind. Take a look at the 2 a.m. wind forecast Friday (below): gusts of more than 40 knots on most of the region’s waterways and 20-30 knots over land. As the first big blow of autumn, you may lose power.
Because Friday’s event took place so early, confidence in the above forecast is great.
I suspect you want to know about the possibility of snow next week.
Total snow forecast through next Saturday (November 12) by US GFS modeling shows heavy snowfall in the mountains across the entire West.
And yes, some snow on the lowlands west of Washington. Most snow falls from Sunday to Tuesday. I will look at snow and cold in more detail in my next blog.
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