Severe weather in the Denver area, including lightning and hail, diverted 24 planes headed to Denver International Airport to Colorado Springs, Colorado Springs Airport officials said.
"One is a 747 from Frankfurt, one is from Toronto, and the rest are domestic," said Colorado Springs airport spokeswoman Heather Lenard. "They'll be on the ground until the weather clears over Denver."
The National Weather Service in Denver issued a tornado warning for western Arapahoe County, east of Denver, until 4:30 p.m.
DIA reports that delays are likely as severe weather continues to move through the state.
A severe thunderstorm remained in effect for northeast Colorado, including Denver, Arapahoe, Boulder, Douglas, Jefferson and Adams counties, until 9 p.m. Tuesday.
In total, 32 planes were diverted away from DIA, with several planes going to smaller airports around the Denver area, DIA officials said. Travelers can check their flight status at flydenver.com.