Stay up to date with all weather conditions affecting transportation in the United States

Summary:
Widespread heat and dangerous heat indices will stretch from Texas to the Northeast and across Montana. Record high temperatures are expected along the I-95 corridor from Boston to Washington, DC. Heavy rain may produce flooding across the Southwestern U.S. and across the Great Lakes and Ohio Valley. Fire weather and isolated dry thunderstorms are likely from the Interior Northwest to Montana.

Summary:
The dangerous heat wave in the Northwest will continue into the weekend. Continued heavy rain and thunderstorms will exacerbate flooding and cause flash flooding the next few days across parts of the Ohio and Tennessee Valleys into the central Appalachians. Daily rounds of heavy downpours could cause flash flooding across portions of Arizona to the Four-Corners region into the weekend.

Summary:
A dangerous heat wave, with widespread excessive heat warnings, heat advisories, and record breaking temperatures will continue to impact the Northwestern U.S. the rest of the week into the upcoming weekend. Excessive rainfall is expected to lead to flooding near the central High Plains and across the Ohio Valley.

West Virginia 

Summary:
A dangerous heat wave with record warm temperatures will persist across the Northwestern U.S. this week. Intense heat will linger in the south-central U.S. through Wednesday. A threat of flash flooding will exist from the Southwest into the Southern Rockies as well as from the Ohio Valley into the Appalachians through the week.

Missouri 

Summary:
Scattered severe thunderstorms will spread across the Ohio Valley and into Upstate New York into this evening. Large hail, damaging winds, and a few tornadoes can be expected. Excessive heat is in place today over the mid-Mississippi Valley and southern Arizona. Another round of excessive heat is expected to spread from the northern Plains into the Southeast U.S. from Saturday into mid next week.

Summary: Dangerous and record heat will persist in the Midwest to the Southeast, impacting nearly a third of the U.S. population. Scattered severe thunderstorms and localized flash flooding are expected across parts of the Upper Midwest.

Summary: Dangerous and record heat will persist in the Midwest to the Southeast, impacting nearly a third of the U.S. population. Scattered severe thunderstorms and localized flash flooding are expected across parts of the Upper Midwest.

Summary: Dangerous, record-setting heat is expected to extend from the Midwest to the Southeast through midweek. Severe thunderstorms are expected over parts of the northern/central Plains, the Midwest, and the Mid-Atlantic

California

Summary: Dangerous heat, and increasing winds, will expand across the center of the United States through early this week as many new daily record high temperatures are in the forecast. Meanwhile, across the Northwest and northern Intermountain West, unsettled weather will persist as excessive runoff and occasionally heavy rainfall may result in flooding.

Summary:

The first Atlantic tropical system is expected to slowly strengthen to a tropical storm. Heavy rain will affect portions of the Florida Peninsula and Florida Keys into the weekend. There is potential for considerable flash and urban flooding in South Florida and the Keys. Elsewhere, widely scattered severe thunderstorms are possible over parts of the central and southern High Plains.