Overview
- An intense, fast-moving line of thunderstorms moved into the Chicago area on Tuesday, prompting tornado warnings, reports of gusts near 80 mph, a ground stop at O'Hare and hundreds to thousands of flight cancellations and delays.
- Utilities and outage trackers reported widespread power losses across Illinois and Indiana that left large numbers of homes and businesses without electricity during the storms.
- The Storm Prediction Center placed much of the Chicago region at an Enhanced risk level because forecasters said the system could organize into a damaging wind-producing line or derecho with embedded brief tornadoes.
- Forecasters warned of additional rounds of strong to severe storms through Wednesday with heavy rain that could produce localized flash flooding where storms train over the same areas.
- Western monsoon storms continued to produce damaging winds, downed lines and ash‑and‑smoke haze in parts of the West while forecasts show cooler, drier air arriving late this week to reduce humid storm coverage.