Dozens of schools across Oklahoma called off classes as bitterly cold sub-zero temperatures and wind chill indexes were reported.
The Oklahoma City and Tulsa school districts - the state's two largest - are among those cancelling classes for Monday.
The National Weather Service issued a wind chill warning for Ottawa and Craig counties until noon Monday and a wind chill advisory for all but far southern and parts of southwestern Oklahoma.
Oklahoma Gas and Electric reported about 1,900 power outages Monday morning - about 1.200 of those in Pauls Valley. The Oklahoma Department of Transportation said drifting snow kept highways in north-central and northeastern Oklahoma slick in spots and crews continued plowing and treating the roads.
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