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Several weather systems will lead to chaotic spring weather for the northern half of the U.S. for the holiday weekend. Meanwhile, drier, summer-like weather will be found in the southern U.S.
Saturday
A low pressure system will spin from the Ohio Valley into the Northeast on Saturday. Rain showers and a thunderstorm or two will be found across the Northeast, Ohio Valley and Mid-Atlantic as a result. The cold front associated with this low pressure system will also be pushing across eastern portions of the Southeast and Florida. This will also bring a chance for rain showers and thunderstorms for the start of the weekend.
A fast-moving disturbance will dance across the northern Plains, Upper Mississippi Valley and Great Lakes on Saturday. Rain and strong to severe thunderstorms will be in the forecast from the Dakotas to Wisconsin and Michigan. The main concerns within thunderstorms that develop will be large hail and damaging winds, but an isolated tornado or two cannot be ruled out.
A larger and slower-moving area of low pressure will be sliding from the Northwest and northern Rockies into the High Plains. Outdoor plans could be ruined as rain soaks those from Washington, Oregon and northern California into Montana, Wyoming and Colorado. There could even be a few snowflakes flying in the highest peaks of the Cascades and Rockies.
Otherwise, high pressure will create dry weather across most of the southern U.S. for the first half of the weekend.
The coolest spots in the U.S. on Saturday will be in the Northwest and northern Rockies, where highs will only reach the 30s, 40s and 50s. Temperatures will peak in the 60s, 70s and 80s for southern California, the Great Basin and Four Corners region along with the north-central U.S. and most of the eastern U.S. Nineties and 100s will be common for the Desert Southwest and Southern Plains.
Sunday
A stalled cold front will become draped over the Florida Peninsula on Sunday. Showers and thunderstorms will be found across the Southeast and Florida.
The low pressure system that moved into the High Plains Saturday will strengthen over the central U.S. for the conclusion of the weekend. An associated cold front will be wrapped from the Desert Southwest into the Upper Mississippi Valley.
Rain and thunderstorms will be found across the north-central U.S., with another chance for severe weather on Sunday. Destructive winds, very large hail and several tornadoes will all be likely within thunderstorms that develop.
Meanwhile, rain and mountain snow showers are expected for the Northwest, Great Basin and northern and central Rockies.
High pressure will provide dry weather for the southern Plains as well as most areas along and east of the Mississippi River.
Jackets will be needed across the Northwest, Great Basin and northern and central Rockies on Sunday, with high temperatures in the 30s, 40s and 50s. The rest of the northern tier will see temperatures reach the 60s, 70s and 80s for the end of the weekend. At the same time, the mercury will peak in the 80s, 90s and 100s for the southern U.S.
Memorial Day (Monday)
Persistent east to southeast winds will set up over Florida, the Southeast and Gulf Coast on Memorial Day. This will funnel moisture from the Atlantic Ocean and Gulf of Mexico into the U.S., resulting in chances for showers and thunderstorms.
An elongated cold front will remain nearly stationary over the western U.S. on Monday, staying draped from the Desert Southwest into the Upper Mississippi Valley. Like Saturday and Sunday, rain and thunderstorms will be found across the north-central U.S., with dangerous thunderstorms possible. Once again, the primary threats will be large hail and strong winds, but a few tornadoes cannot be ruled out. Meanwhile, rain and mountain snow showers will continue for the Memorial Day holiday in the Pacific Northwest and northern and central Rockies.
A strong high pressure system will be anchored over the Tennessee Valley for the holiday, fostering dry and quiet weather across the eastern third of the U.S.
The higher elevations of the West will see high temperatures in the 30s, 40s and 50s, while the rest of the western U.S. will see temperatures peak in the 60s, 70s and 80s. At the same time, the mercury will soar into the 70s, 80s and 90s for the eastern two-thirds of the U.S., with 100s possible in the southern Plains.