Heavy winds, hail and tornadoes are possible, the National Weather Service says.

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The heavy rain and hail hampered rescue efforts in Oklahoma City.

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Hail and heavy rain pelted the metro area to the point that emergency workers had trouble responding to "widespread" reports of injuries.

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Farther east and south, more typical spring storms -- meaning possible severe thunderstorms with hail, heavy rain and gusty winds -- were expected to visit the southern Plains and Mississippi River Valley by Wednesday evening.

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Several minutes into the flight, at around 10, 000 feet, we encountered a violent thunderstorm with heavy lightning, thunder, hail, and rain.

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Residents of the city awakened to crumbling walls, crushed cars, fallen trees and scattered branches after heavy rain, wind and hail hit Wednesday night, the state-run Telam agency said.

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"This storm had everything you could handle at one time: tornadoes, hail, lightning, heavy rain, people clogging the highways, " Mr. Smith said.

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Some of these were heavy and thundery with a few outbreaks of hail.

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Heavy rain, thunderstorms, high winds and hail moved through sections of the Northeast on Sunday afternoon, knocking out power to more than 40, 000 in Vermont, New Hampshire and Maine.

WSJ: Damaging storms moving through east, south

The Met Office said heavy showers, some of which could be thundery and with a risk of hail, were expected to develop widely on Friday.

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