The warning stays in effect until about 11:30 p.m. Friday.
"A couple of storms over the eastern plains could become severe with hail up to one inch in diameter and 60 miles per hour wind gusts".
The high temperature on Saturday is expected to be 82, when afternoon rain and thunderstorms are expected.
Hail damage to vehicles is expected, along with wind damage to roofs, siding and trees.
Forecasters say severe storms will move from the Oklahoma Panhandle and northwestern Oklahoma Thursday night.
Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.
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Residents are asked to follow all instructions from emergency services officials and signs to keep lanes clear for emergency vehicles.
The watch was issued at about 2:45 p.m.
Environment Canada is warning a severe thunderstorm could bring strong winds, heavy rain and large hail to southwestern Ontario Friday.
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Additionally, U.S. 60 is blocked due to downed trees and storm debris about 1½ miles east of Bartlesville, according to the Oklahoma Highway Patrol.
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