Saturday, April 21, 2018
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The nation's weather
The nation's weather
By The Associated Press

The southern portion of the US was expected to continue to see hot temperatures on Saturday, while multiple areas of active weather pop up across the nation. A ridge of high pressure was expected to remain over the southeastern corner of the United States contributing to temperatures over 100 degrees from the Southeast to the Mid-Atlantic states. Low level flow from the west was expected to help to reduce the humidity, but provide ample heating for the Southeast. Meanwhile, Tropical Storm Don was expected to continue to move westward over southern Texas Saturday morning bringing heavy downpours and strong winds with a chance of localized flooding. Tropical Storm Don was expected to weaken to a tropical depression by Saturday evening with winds less than 39 mph (35 knots).

To the north, low pressure spinning over Maine was expected to push a cold front through the Northeast kicking up showers and thunderstorms during the late morning hours. The tail end of this front was expected to create scattered showers and thunderstorms from the Mid-Atlantic states to the Mid-Mississippi River Valley.

In the Midwest, a large low pressure system positioned over Canada as expected to pull a frontal boundary through the Northern Plains and Upper Mississippi Valley producing heavy showers and possible severe thunderstorms. This also was expected to start to pull warm and moist Gulf air into the region, allowing for hot and muggy conditions to return to the Central and Northern Plains.

To the west, monsoon moisture was expected to continue to kick up scattered showers over the Four Corners region, and also in parts of California and Nevada. Meanwhile, a weak ridge of high pressure was expected to continue to bring sunny and dry conditions across the West Coast and Intermountain West. Temperatures in the Lower 48 states Friday ranged from a morning low of 28 degrees at Stanley, Idaho to a high of 106 degrees at Needles, Calif.

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