The final few days of September will feature mostly tranquil weather conditions throughout the Nation outside of a few areas expecting scattered showers and thunderstorms.
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After a cold front moved through the Pacific Northwest yesterday, widely scattered showers are expected to continue through today before a potent low pressure system swings into the region tonight.
Locally heavy rain and rough surf for coastal locations are possible into early Wednesday as the system quickly moves inland.
Rainfall is expected to remain mostly beneficial given the severe to extreme drought conditions in the region.
In addition to the wet weather pattern, below average high temperatures are forecast throughout the Northwest, with peak values only reaching into the mid-60s.
For the Midwest and Ohio Valley, a slow-moving area of low pressure is expected to produce areas of moderate-to-locally heavy rainfall across the Midwest today and Ohio Valley on Wednesday.
Localized flash flooding may occur within the heaviest rainfall, as showers and storms are likely to progress at a slow pace.
Some stronger storms could also contain isolated hail and damaging wind gusts.
Unsettled weather is also expected to remain in the forecast throughout parts of the Mid-Atlantic and Southeast as a stalled frontal boundary extends from the western Atlantic to the eastern Gulf Coast.
The main impacts across the Mid-Atlantic will be in the form of light showers and well below average temperatures.
High pressure building into southern Quebec will aid in easterly flow and ample cloud cover to keep high temperatures in the 60s through midweek from southern New England to the Mid-Atlantic.
Meanwhile, where the aforementioned frontal boundary interacts with higher atmospheric moisture content, scattered thunderstorms capable of intense rainfall rates are possible across much of Florida.
Urban flooding will be the greatest potential impact should thunderstorms remain relatively stationary for a brief period of time.
A Marginal Risk (level 1/4) of Excessive Rainfall has been issued across much of the Sunshine State and southern Georgia in order to highlight the localized flash flood potential.
Summer warmth remains over parts of the northern High Plains today and is forecast to shift into the central Plains by Thursday.
Highs into the 80s and low 90s are expected, which equates to around 10 to 20 degrees above average when compared to typical late-September afternoon temperatures. ■