SALT LAKE CITY -- Rocky Mountain Power says severe weather is causing a series of power outages across Salt Lake City.
Powerful storm cells moving across the city have left more than 8,000 customers without power.
That number nearly tripled between 3 p.m. and 4 p.m. Thursday during high winds and thunderbolts.
The utility didn't know when power would be restored for all or some of the customers in four zip codes of Salt Lake City.
The Utah Highway Patrol says a semi-tractor rig hauling frozen food jackknifed on Interstate-80 near Wanship, 28 miles east of Salt Lake City.
Troopers said the rig lost control at 2:40 p.m. on wet roads and spilled about 100 gallons of diesel fuel.
The driver wasn't hurt. Troopers expected eastbound lanes to remain blocked for about an hour.