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 The system will support moderate rainfall and thunderstorms from the mid-Mississippi Valley through the southern Ohio Valley in Kentucky. Meanwhile, more scattered rain showers, periods of heavy rain and thunderstorms are anticipated in the Southeast as an associated cold from eastern Texas advances eastward through the
lower Mississippi Valley and meets with Gulf moisture. Heightened instability over portions of the Gulf Coast
states and Florida will lead to a slight risk of severe thunderstorm development through the day. Earlier storms will be
only marginally supportive of severe storm organization capable of producing damaging wind gusts and hail. The risk for a a few strong to severe storms will increase through the evening
and overnight.
In the West, the slow-moving frontal boundary of the region will extend from the
northern High Plains through western Arizona by Thursday evening. Expect rain and high-elevation snow in the
northern Rockies and northern Intermountain West to spread into areas of the
central Great Basin and northern High Plains. Meanwhile, unseasonably cool showers and high-elevation snow will persist in the Pacific Northwest and parts of northwestern California as a deep trough of low pressure moves slowly eastward into the Pacific Northwest.
Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 12 degrees at Mount Washington, N.H., to a high of 91 degrees at Orlando, Fla.
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