KANSAS CITY - Tornadoes pummeled Oklahoma, Nebraska and Kansas on Saturday and severe weather struck a hospital in Iowa as residents of the US Central and Southern Plains states hunkered down for a predicted major outbreak of twisters that could continue into the night.

But even as storms skipped across the region, no deaths or injuries were reported from twisters by nightfall, as violent tornadoes appeared largely restricted to mostly underpopulated areas.

"Conditions will remain very favorable through the evening for very strong and potentially long-lived tornadoes," the National Weather Service said in an advisory. "Tornadoes will be possible in these areas through the early morning hours."

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