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 In the South, significant moisture from the Gulf of Mexico will spread northward ahead of the cold front moving through the Southeast and warm front lifting up through the Mid-Atlantic. This will aid in producing showers across the southeastern corner of the nation and moderate to locally heavy rain and thunderstorms in the Mid-Atlantic,
central Appalachians and parts of the western Ohio Valley. Heavy rainfall in already saturated areas from recent rainfall will likely raise flood concerns through the day. To the north, moisture pooling near a frontal boundary stalling across the Northeast will translate into light to moderate showers through the day.
In the West, thunderstorms will prick up again across parts of the central and
southern High Plains into western Texas. Heavy rain, damaging wind gusts and hail may accompany strong to severe storms in southwestern Texas. Flash
flood watches are expected to continue for southeastern New Mexico into western Texas through the evening.
Further west, hot temperatures will continue across the desert Southwest as high pressure remains over the much of the West. Temperatures in the region are expected rise well above 100 degrees this afternoon, with the warmest locations ranging from about 106 degrees to near 110 degrees. Excessive
heat warnings and watches are expected to remain for areas of southwestern Arizona and southeastern California.
Temperatures in the Lower 48 states Sunday ranged from a morning low of 19 degrees at West Yellowstone, Mont., to a high of 100 degrees at Thermal, Calif.
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