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If you are trying to soak up the last days of the summer sun, outdoors plans will go off without a hitch in several areas this weekend. However, it will be a soggy forecast for parts of the West and southeastern U.S.
Saturday
High pressure that has been centered over the Great Lakes will gradually shift to the Northeast on Saturday. On the western and southern fringes of this high pressure system, there will be the remnant moisture of Francine along with a surge of moisture from the Atlantic.
This will translate into chances for rain and thunderstorms across the northern Plains, Midwest, Tennessee Valley and Southeast. The best chance for any rain and thunderstorms will occur in the Tennessee Valley and Southeast. Here, torrential downpours will be a possibility. After days of rain and already saturated soils, be on the lookout for localized flooding, especially in urban, low-lying and other more flood prone areas.
An upper-level weather system will be strengthening over the Northwest for the start of the weekend. Rain showers and a few thunderstorms will soak outdoor weekend plans for Northwest and far northern Rockies.
There could also be some limited monsoonal moisture that streams into the Arizona and New Mexico. Isolated to scattered showers and thunderstorms are possible as a result.
Dry weather will prevail for California into the Great Basin and central/southern Rockies, the south-central U.S., Northeast and Mid-Atlantic.
For areas along and east of the Mississippi River, temperatures should generally peak in the 70s and 80s. However, some upper 60s cannot be ruled out in the Appalachians and interior New England.
Temperatures will be more variable for the western half of the U.S. Expect 60s, 70s and lower 80s for the Northwest, Great Basin, Rockies and northern Plains. The tallest peaks though could only have temperatures in the 40s and 50s. Eighties and 90s are expected for California into the Southwest, and the central and southern Plains. A few 100s are also possible in the typical hotspots.
Sunday
Across the eastern half of the U.S., the weather pattern will not change for the end of the weekend. High pressure will remain settled over the Northeast, while a stream of moisture from the Atlantic moves along the western and southern fringes of the high pressure system.
Rain showers and thunderstorms remain in the forecast for the Mississippi Valley, Midwest, Tennessee Valley and Southeast. Heavy to very heavy rainfall will be possible, especially across the Tennessee Valley and Southeast. Areas of flooding will continue to be likely. Remember to “Turn Around, Don’t Drown!” if you approach a flooded roadway.
The western half of the nation will have to contend with an upper-level weather system over the Northwest and a higher surge of monsoonal moisture. There will be a good chance for rain showers and thunderstorms across the Rockies, Front Range and Southwest, mainly in the afternoon and evening. A few showers and thunderstorms will also be possible in the Northwest and Great Basin.
A few areas stay dry to close out the weekend. This includes most of California, the Plains, Northeast and Mid-Atlantic.
Like Saturday, the eastern U.S. will report highs in the 70s and 80s on Sunday. Expect mainly 60s, 70s and lower 80s again for the Northwest, Great Basin and Rockies, with 40s and 50s in the highest elevations. Eighties and 90s will be in the forecast elsewhere, with 100s across the Desert Southwest and southern Plains.