Showers and thunderstorms are forecast to continue today across the Mid-Atlantic and the Southeast as a slow-moving cold front gradually pushes towards the East Coast.
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Severe thunderstorms will be possible from the eastern Carolinas where the Storm Prediction Center has highlighted an area with a Slight Risk of Severe Thunderstorms (level 2/5) and in southern Georgia and north Florida where there is another Slight Risk (level 2/5) area with an embedded Enhanced Risk (level 3/5) area.
The main thunderstorm threat will be damaging winds, but hail and locally heavy rainfall/isolated instances of flash flooding will be possible.
Precipitation will come to an end for most areas in these regions tonight as the front moves into the Atlantic, but isolated showers and storms will remain possible in south Florida through the weekend as the frontal boundary slows/stalls.
By this afternoon, a frontal system will develop over the Upper Midwest then push across the Great Lakes and Ohio Valley tonight.
This system will cause precipitation chances to return to the Mid-Atlantic and southern New England on Saturday with another round of showers and thunderstorms expected.
This system is forecast to be weaker than the system that impacted the region on Thursday and Friday, and severe thunderstorms are not expected.
Another front will drop south into the northern Plains and upper Midwest on Sunday, but the frontal passage is expected to be mostly dry with only some scattered showers and storms.
Meanwhile, an upper level low and a stationary surface front will be positioned over the southwestern U.S., which will support low elevation showers and thunderstorms over the central and southern High Plains and the Four Corners region and high elevation wintry precipitation through Saturday.
Most lower elevation areas will see light to moderate rainfall, though some heavier showers/storms will be possible heading into Saturday evening for portions of west Texas, with some isolated flash flooding possible.
The upper low will gradually push east Saturday night into Sunday, and precipitation chances will expand into the central and southern Plains as a low pressure system develops.
This system will push east early next week, and warm, moist inflow from the Gulf of Mexico will likely support heavy rainfall in the warm sector that could potentially lead to flash flooding in parts of the South.
The Pacific Northwest and much of California will remain dry through this weekend as surface high pressure and upper level ridging remain anchored over the region.
This will result in above average temperatures with highs in the 80s and even lower 90s (15-25 degrees above average) in some areas.
The upper level ridge and above average temperatures will expand east across the north-central U.S. over the weekend where highs will range from the mid-70s to the lower 80s.
Elsewhere, forecast precipitation and cloud cover will result in temperatures below or near average. ■
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