Weather Alerts For La Salle, IL

URGENT - WEATHER MESSAGE National Weather Service Chicago IL 1206 AM CST Thu Dec 25 2025 La Salle- Including the cities of Mendota, Streator, Ottawa, Marseilles, and La Salle 1206 AM CST Thu Dec 25 2025 ...DENSE FOG ADVISORY IN EFFECT UNTIL 6 AM CST EARLY THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...La Salle County. * WHEN...Until 6 AM CST early this morning. * IMPACTS...Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. &&