Update 5:30PM CDT…
Outdoor burns are discouraged…the red Flag Warning (red-shaded counties on the highlighted map) for a threat of wildfires continues in effect until this evening and has been posted again for northeast Illinois into northwest Indiana for the period Noon until 7PM CDT Tuesday. Strengthening southerly winds along with warm temperatures, very low humidity (the relative humidity was 14% at O’Hare this afternoon , just missing the record low of 13 %) and widespread dry conditions will be all contribute to fast-spreading fires.
CHICAGO — The Chicago National Weather Service has issued a Red Flag Warning (pink-shaded counties on the highlighted map) to discourage outdoor burns from noon until 8 p.m. Monday.
Low-level winds are expected to increase from the south at 15 mph with gusts up to 30 mph this afternoon. There will be dry conditions area-wide with temperatures warming into the upper 70s. A very low humidity air mass is in place (dew points in the 20s and relative humidity in the teens). Conditions are very supportive of rapidly-spreading fires.