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5 Things to Watch in This Week's Weather, Including More Summerlike Warmth in the East and Rockies Heavy Snow
Published: October 2, 2017
The first week of October will deliver summerlike warmth, snow, a potent cold front and a soaking rain over the Lower 48 states.
A cold front will sweep across the country in the week ahead, bringing back a familiar pattern of cold and snow in parts of the West, contrasting with warm air in the East. A quick splash of rain and thunderstorms will also slide from the Plains into the Midwest and Northeast throughout the week, as well.
Here are a few things you should know about this week's weather.
1. The East, Midwest and South Will Warm Up, Once Again
Another burst of summerlike heat will arrive in much of the eastern half of the country through this week as a ridge builds in the East.
Monday, high temperatures up to 20 degrees above average are expected from the mid-Mississippi Valley into the Great Lakes and the interior Northeast. That warmth should only spread to much of the East Coast later in the week ahead of a cold front that will gradually slide in.
This translates to daytime highs in the 80s as far north as the Great Lakes and Northeast, eventually including parts of the Interstate 95 corridor. Fortunately, we're not expecting the kind of searing 90-degree heat across the Midwest that we saw in the previous heat wave.
East Coast Warm-Up
Isolated record highs are possible, but record temperatures will be far less numerous than last week.
By late week, the heat is pushed into the East and South, where highs will be 5 to 15 degrees above average.
This translates to temperatures in the mid- to upper 70s into southern New England and 80s across much of the South. Some parts of Texas and the Deep South could cross the 90-degree mark this week.
2. Rockies Snow to Include Some First-of-the-Season Low-Elevation Locations
A plunging jet stream and cooler temperatures will dip into the Pacific Northwest and the northern Rockies to begin the week ahead.
Snow will once again blanket the northern and parts of the central Rockies and Wasatch through Tuesday. Some of the highest peaks of Wyoming's Tetons and Bighorn Mountains may pick up a foot of new snow. Keep this in mind if you plan to visit the national parks.
But it won't simply be the mountains getting snow.
In this case, the air near the surface may be cold enough for the first accumulating snow of the season in some lower elevations of Montana and Wyoming.
The NWS has issued winter storm warnings for parts of Montana and has mentioned the threat of tree and power-line damage from the weight of wet snow on trees and power lines, a frequent problem in early- and late-season snowstorms. Winter storm warnings are also in effect for the high elevations of far northeast Utah, northern Colorado and south-central Wyoming for the likelihood of impassable roads and possible power outages.
Snow will begin to lift out of the region Tuesday night as moisture moves farther east with a cold front, and temperatures will begin to rebound into the 30s and 40s.
3. A Front Will Barrel Through the Country's Midsection Midweek
A cold front will be slicing through the nation between the warmer temperatures in the East and the wintry conditions in the West.
The front will begin to tap into Gulf of Mexico moisture as it reaches the Plains. This will enable a broken line of showers and storms to rumble across the Midwest and Plains states early this week, before eventually shifting into the Northeast and Ohio Valley later in the week.
Isolated strong to severe thunderstorms cannot be ruled out in parts of the Plains into Monday as this front moves east. Heavy rain could also cause flash flooding in the Upper Midwest through Monday night, from northeast Nebraska into Minnesota.
(MORE: Current Radar)
4. Chilly Temperatures in Parts of the West
Temperatures will continue to fall after the passage of the cold front and into mid- to late week.
Early this week, temperatures will have a hard time getting out of the 40s and 50s in the Northwest, including in the Rockies and the Great Basin. This places temperatures up to 30 degrees below average in these areas.
By midweek, this cooler air will try to venture eastward into the Plains in muted form. Temperatures will remain up to 20 degrees below average across the northern Rockies, while temperatures will moderate within a day or two in the Plains.
Although there will be some recovery of the temperatures, they will not rebound to even average through at least Friday in parts of the West. Temperatures will remain 5 to 15 degrees below average from parts of northern Nevada into the northern Rockies with the coolest temperatures expected in parts of Montana, Idaho and Wyoming, where temperatures could struggle to get out of the 40s and 50s during the day. Overnight lows are expected to stay in the teens and 20s.
Forecast Morning Lows
5. Watching the Tropics
A large pool of deep tropical moisture could bring heavy rainfall to parts of Florida, Cuba, the Bahamas and the Cayman Islands during the first week of October. Clouds and rainfall will be on the increase going into the new work week.
It is too early to say exactly how much rain will fall and what spots will see the most rainfall.
If this pool of moisture can coalesce enough, a tropical depression or tropical storm is possible on either side of Central America toward the end of the week. For more details, see the link below.
Potential Development Area
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