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The “unofficial” end of summer occurs this weekend as we celebrate Labor Day. However, summer-like heat continues for many parts of the U.S. Soggy weather will dampen outdoor holiday plans most of the weekend in the East, with it turning unsettled in the West by Labor Day.
Saturday
A cold front will inch across the Northeast, Mid-Atlantic, Tennessee and Lower Mississippi valleys and the southern Plains on Friday. This cold front will interact with a surge of moisture from the Gulf of Mexico. As a result, widespread to extensive rain and thunderstorms along this front throughout the day. There will be a smaller chance for showers and thunderstorms in the Ohio Valley, Lower Midwest, Deep South and Southeast.
In the Northeast and Mid-Atlantic, there could be a few strong to severe thunderstorms that develop. The main threats would be damaging winds and large hail. However, any location in the path of the cold front will be at risk for slow-moving, repeated rounds of moderate to heavy rain. Be on the lookout for localized flooding, especially in urban, low-lying and other more flood prone areas.
At the same time, a new cold front will be dropping south through the Upper Mississippi Valley and Great Lakes. This will likely lead to showers and thunderstorms during the afternoon and evening.
There will also be a limited supply of monsoonal moisture in the Four Corners states. Isolated showers and thunderstorms could develop here in the afternoon and evening.
Otherwise, expansive high pressure will be in control of the weather for the western half of the nation. Expect dry, quiet weather for the start of the holiday weekend for the West Coast, Great Basin, the northern Rockies and northern Plains.
Most of the nation will report highs in the 70s and 80s on Saturday. Expect some isolated 60s in the tallest elevations of the Rockies, while several areas see 60s close to the U.S.-Canada border in the Plains, Upper Mississippi Valley, Great Lakes and Northeast. Nineties will be common though in the Northwest, Great Basin, the northern and central Plains and the Deep South. Widespread 90s and 100s are expected across California into the Desert Southwest.
Sunday
A cold front will be nearly stationary from the Northeast and Mid-Atlantic into the south-central U.S., while another cold front pushes across the Great Lakes and Northeast. This will force the two cold fronts to merge into one.
Rain and thunderstorms will soak the Northeast, Mid-Atlantic, Ohio and Lower Mississippi valleys and southern Plains throughout the day. There will be a smaller chance for showers and storms in the Southeast and Deep South, with showers and thunderstorms possible in the Upper Great Lakes in the morning.
While a gusty thunderstorm cannot be ruled out, the main concern will be repeated rounds of moderate to heavy rain, especially along the stalled cold front. Localized flooding is a possibility, so remember to “Turn Around, Don’t Drown!” if you approach a flooded roadway.
If you want to head outdoors, you should head to the western half of the U.S. High pressure continues to foster dry and quiet weather for the West Coast, Great Basin, Rockies and the northern half of the Plains.
Sunday’s temperatures should be similar to Saturday. Expect mainly 70s and 80s throughout the U.S. Sixties will be more widespread across the northern Plains, Upper Mississippi Valley and Upper Great Lakes, with 60s also possible in the higher elevations of the Rockies. A few 90s are possible in the Northwest and Great Basin, with good coverage of 90s in the southern Plains, Deep South and Southeast. There will be mainly 80s and 90s in California, but the Desert Southwest will once again heat up into the 90s and 100s.
Labor Day
The stubborn cold front from earlier in the holiday weekend will start to sag south on Labor Day. This front will mainly be settled over the Southeast, Deep South and southern Plains. Consequently, the bulk of rain and thunderstorms will be found along the front. Expect just a slight chance for showers and thunderstorms in the Tennessee Valley and Mid-Atlantic.
Changes arrive for parts of the western half of the U.S. on Labor Day. An upper-level weather system and associated cold front will push across the West Coast and northern Rockies. There will also be a small supply of monsoonal moisture that is transferred into the Southwest and Rockies. Expect isolated to scattered showers and thunderstorms in the Northwest, Great Basin and Rockies. However, it should stay dry for California.
A large area of cool Canadian high pressure will build over the north-central and northeastern U.S. Expect dry weather from the northern half of the Plains and Midwest into the Northeast.
High temperatures will only be in the 50s, 60s and lower 70s across the Northeast. Seventies and 80s will cover the Upper Mississippi Valley, Midwest, Great Lakes, Ohio Valley and Mid-Atlantic. Expect 80s and 90s for the Lower Mississippi Valley, Deep South and Southeast.
Most areas in the western half of the U.S. will experience 80s and 90s, though the Northwest and Rockies will see temperatures in the 60s and 70s. California will report mainly 80s and 90s, but the Desert Southwest will observe 100s and 110s!