An abundant amount of moisture streaming ashore from the Pacific will cause day after day of snow and rain from Nov. 20-22.
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NewsTranscript
00:00We are heading a little bit further west now, the northwest, where we are tracking rounds of rain and snow.
00:06This is going to be a high-impact storm. AccuWeather forecasts were more detailed and more actionable than those from other known sources
00:13in conveying how mountain snow could result in dangerous travel conditions in parts of the Pacific Northwest
00:18back on Sunday and Monday, including east of the Seattle metro. There's another storm coming.
00:23Our goal is always to help you stay safe, and we're going to give you the most advanced notice
00:27so you can make the best decisions for you and your family.
00:30Well, just for fun, with this western conversation, let's go all the way to the northwest.
00:34So here is the midday sun. This is as high as the sun's going to get in the sky today in Nenana, Alaska.
00:40This is kind of in south-central Alaska, snow on the ground there, a lot of cirrus clouds filtering that sun.
00:46This is as high as it gets. It's all downhill from here here for the next few months.
00:51And, well, there are no big storms up in that part of Alaska now.
00:54We've got a monstrous storm just off the west coast of the U.S. Look at this thing.
00:58We even have an eye-like feature sending an abundant amount of moisture into the western U.S.
01:03So this is absolutely an atmospheric river event. Sometimes it's debatable.
01:07People wonder, is it really an atmospheric river event?
01:09Well, this is clearly one that's going to be a high-impact event for the next several days,
01:14and we're getting into it here. So let's talk about some of the impacts.
01:17Satellite-radar combination passed several hours here. The core of the storm is way west of Portland right now,
01:24but the onshore flow is just like a fire hose directed at southern Oregon and northern California.
01:31That's where the heaviest rain will fall, and you're probably noticing that we have this deep, deep blue here
01:36over areas around Siskiyou County and all the way down into the area around the northern Sierras.
01:40So places like the I-5 Pass into northern California, around 4,000 feet or so,
01:47you're going to get hammered with some very heavy snow there. We're going to have many inches of rain,
01:51many inches of rain here in low elevations along the coastal range and down to the coast.
01:55Tomorrow, highs 49 in Medford. Steady rain, Portland, Medford, Seattle, San Francisco,
01:59getting into some significant rain there as well, specifically some of the heaviest rain.
02:04Medford down into Redding, California. You will have some rain into Seattle too,
02:08but the steadiest, really heavy stuff is going to be impacting Medford and other areas.
02:12Thursday, more of the same. We're looking at feet of snow in the mountains
02:16and some very heavy rain there, multiple inches. We'll have more details during our Big Three.