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 In the South, a lingering frontal boundary will remain stretched across Texas and the Southeast. This boundary combined with abundant moisture from the Gulf of Mexico will translate into another batch of rain and afternoon thunderstorm activity through the day. Meanwhile, to the north, a trough of low pressure in the jet stream will continue to dip across much of the East, supporting pockets of showers and a few thunderstorms, primarily in the Northeast, Mid-Atlantic and parts of the
upper Great Lakes.
Behind this activity, the frontal system moving into the upper Midwest will fuel chances of showers and thunderstorms from the
northern Plains and the upper Mississippi Valley through the central High Plains. Areas of the
north-central High Plains are at slight risk of severe thunderstorm development during the afternoon and evening. While the main concerns with these storms are large hail and damaging wind gusts, a few tornadoes cannot be ruled out.
In the West, a cold front reaches northwestern California and the Pacific Northwest with rain showers. Cool, showery weather is expected to continue into Friday.
Temperatures in the Lower 48 states Wednesday ranged from a morning low of 23 degrees at Eureka Airport, Nev., to a high of 99 degrees at Tucson, Ariz.
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