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The best time to travel on both Saturday and Sunday is before noon, according to the AAA. However, time could be a tricky factor.
Heavy rains associated with an atmospheric river will flood the Pacific Northwest, while a clipper system will bring snow and strong winds this weekend to many in the Midwest and Northeast.
We start first in the northeast, where more than 8 million people are currently under winter weather alerts. This figure is likely to increase during the weekend.
When one system leaves New England on Saturday, another will gather strength over the Great Lakes en route to New England on Sunday.
The first system has left appreciable snow in its path. It has accumulated about a foot on some of the highest peaks in Vermont and New York from Friday to Saturday morning.
Meanwhile, between 4 and 6 inches have fallen east of Lake Erie with lighter amounts elsewhere.
“Blowing snow caused by windy conditions are likely to remain a hazard for the interior Northeast today,” the Weather Forecast Center said Saturday morning. This snowfall could reduce visibility on northeast roads on Saturday.
The second system, an Alberta Clipper, will move through Minnesota on Saturday producing a mixed precipitation bag in parts of the Midwest, mostly in the form of rain and water.
Then, conditions deteriorate from west to east until Sunday afternoon, as the clipper heads to New England.
The consensus will be an additional 1 to 3 inches from Minnesota to Maine. Even on Sunday you can see gusts of snow in New York City and Philadelphia.
However, the Great Lakes are 100% ice free. As a result, decent lake-effect snow bands could be installed with the proper input of wind and cold air.
Therefore, some areas could see up to an additional 8 inches of snow, such as those under the wind of Lake Erie, due to the creation of these snow bands by lake effect.
The wind conditions that accompany the clipper will again cause poor visibility on the roads, as well as some air retention. Delays at the airport for the most part on Saturday and Sunday, however, appear to be minor in the Northeast.
The atmospheric river permeates the northwest Pacific
Another area that could see delays in travel this weekend will be in the Pacific Northwest.
A level 4 out of 5 “extreme” atmospheric river event is expected to produce several inches of rain in the Pacific Northwest from Saturday through Sunday. A level 4 atmospheric river is classified as “primarily dangerous, but also beneficial” according to the Center for Western Weather and Water Extremes (CW3E). This means that the risks of floods and landslides could pose a threat to the entire region, but the amount of heavy rainfall could also be beneficial for drought conditions or for filling reservoirs.
Heavy rain is expected to fall in coastal regions, including Seattle, on Saturday afternoon and evening before moving on to the Olympics and north of Cascades on Sunday.
This weekend’s atmospheric river event is the second in a series of three storms, the first brought rain to the Pacific Northwest on Thanksgiving Day and the third is expected to impact the region. for Tuesday.
This heavy rain will not only be limited to Washington state; this weekend will also extend north to British Columbia in Canada. Both areas have experienced heavy rainfall over the past two weeks, causing a record rainfall and flooding. ” Due to high forecasted freezing levels and moist soil conditions caused by the multiple [atmospheric rivers] during 10 to 16 November, a large portion of the precipitation could lead to runoff, exacerbating [flood] impacts,” warns the CW3E.
Flood vigilantes are in place for more than 3 million people in parts of Washington state, including Seattle, as between 3 and 6 inches of rain are expected.
There is not much snow in the forecast for Washington state, as temperatures are 10 to 20 degrees above normal in late November with highs at 50. Although these milder temperatures can be a good change with respect to the cold of winter, can cause other dangerous at higher elevations.
“Mild temperatures and wind will lead to some melting of the early season snowpack,” the National Weather Service (NWS) said Saturday morning in Spokane, Washington.
This mantle of snow that melts along with heavy rain could increase runoff, further increasing the threat of flooding.
“There will also be an increased risk of rock slides and debris flows in steep terrain and the potential to impact roads and backcountry trails, including near burn scars,” NWS Spokane also said.
Those planning to take a walk through the mountain ports this weekend will need to plan these dangers accordingly or wait until the weather improves on Monday afternoon.
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