The greatest risk of severe thunderstorms will again focus over part of the middle Mississippi Valley, spanning areas from the central Plains to the northern Ohio Valley states into Tuesday.
The strongest thunderstorms will bring potential for damaging wind gusts, hail and isolated tornadoes, especially from portions of Iowa to northern Missouri and Illinois.
Look for isolated thunderstorms from the afternoon hours to organize into groups or lines during the evening. The storms will tend to cover a considerably greater amount of ground as a result, than if they remained widely separated.
States stretching from the southern Canada border to the central High Plains, eastward through western Pennsylvania, with time will be visited by locally severe thunderstorms.
While thunderstorms over the upper Ohio Valley are in the weakening stages Monday evening, new storms will cover more ground Tuesday over Ohio, West Virginia, southern Michigan, southwestern Ontario and western Pennsylvania.
Many of the downpours from the storms are falling on the saturated ground of the Plains which will immediately run off rapidly, bringing streams out of their banks. In turn, motorists should expect road closures and, in the worse case scenario, road washouts.
The repeating heavy rainfall is taking its toll on some of the rivers over the northern and central Plains as well.
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Increases in temperature may cause localized increases in the amount of toxic mercury introduced into ecosystems, impacting wildlife and eventually the food chain.
A new surge of warm air will trigger another round of severe thunderstorms in parts of the eastern United States Wednesday and Wednesday night.
Unsettled weather will continue through midweek as showers dampen much of Germany.
Spring will get off to a slow start over much of northern Asia and in part of the Middle East, while more typical conditions are in store for most areas farther to the south and east.
After record warmth baked the eastern U.S. during the last full week of February, winter will seek its revenge during the first week of March.
Prior to midweek, severe thunderstorms with isolated tornadoes, damaging winds, downpours and hail will threaten areas from Indiana to Texas.
Millions travel to Washington, D.C., each year to catch a glimpse of the magnificent pink blossoms.