An atmospheric river starting on Thanksgiving Day is threatening to once again bring heavy rainfall to the Pacific Northwest, just over a week after floods damaged Washington state, officials from the National Weather Service have warned. In its Thursday weather bulletin, Forecasters at NWS said “a new Atmospheric River containing rich subtropical Pacific moisture takes aim at the Pacific Northwest this evening.” “A prolonged stretch of moderate-to-heavy rainfall combined with rapid snowmelt could lead to excess runoff. This may result in quickly rising creeks and streams, making localized flooding a possibility in parts of western Washington. Locally heavy rainfall is also possible in far northwestern Oregon, but the heaviest rainfall totals (1 to 3 inches) are most likely to occur in the Olympics and northern Cascades.” While the high pressure system building atop the Northwest on Friday will provide some temporary respite from the rainfall, another round of downpours is …