* WHAT...For the Extreme Cold Warning, dangerously cold wind chills as low as 25 below. For the Cold Weather Advisory, very cold wind chills as low as 14 below expected. * WHERE...In New Jersey, Western Passaic County. In New York, Orange County. * WHEN...For the Extreme Cold Warning, until 1 PM EST this afternoon. For the Cold Weather Advisory, from 1 PM this afternoon to 10 AM EST Monday. * IMPACTS...The dangerously cold wind chills could cause frostbite on exposed skin in as little as 30 minutes.