An 18-wheeler fire on northbound I-69 at Bellaire prompted a hazmat cleanup that closed multiple lanes and snarled the morning commute. Drivers were told to seek alternate routes.

Thunderstorms forced an FAA ground stop at IAH early Sunday, grounding departures and causing morning delays. Travelers should check carrier alerts for updates.

National gas averages dipped below $4; analysts predict more relief but warn a Gulf storm could quickly reverse gains.