The latest forecast reveal a substantial shift in the upper-level pattern with troughing (low pressure) over the Northwest and northeast Pacific. And yes....it is going to get wet. Let's start with the 500 hPa (about 18,000 ft) forecast for Saturday at 5 PM. Big trough over our region, but the main action is offshore.
Or we can look at the average of many forecasts (the ensemble mean) for the same level, in this case for Sunday at 5 PM. This figure also shows the anomaly--difference from normal--with color shades. Big trough over the NW coast, which means cooler and wetter.
Over a 24h period ending Saturday at 5 PM, good rain along the coast and western Oregon, but only light rain reaching Puget Sound
Ditto on Sunday.
For the next 24h (Monday), still wet over the coast and offshore, but not much over the interior.
On Tuesday, significant rain engulfs western Oregon and Washington.
And then much wetter conditions on Thursday.
Bottom line: if you keep away the coast, this weekend will be tolerable and eastern Washington should be pleasant. But wetter conditions are expected later in the week over both sides of the Cascades.
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