PURCELL — McClain County commissioners extended a ban on burning in the county through noon Monday. Dry winter conditions make outdoor burning dangerous because fires could easily get out of control, county officials said. Eighteen Oklahoma counties, mostly in southern parts of the state, were under self-imposed burn bans Tuesday. Cleveland County officials warned against outdoor burning this week, but have yet to institute a burn ban. State law allows counties to call emergency burn bans for a seven-day period; after that, they must be reviewed and renewed or discontinued. The governor’s office hasn’t called a burn ban for any counties in the state. Burn ban information can be viewed at www.forestry.ok.gov/burn-ban-information.