Forecasters say conditions are favorable for a land-spout tornado for Denver Tuesday afternoon, primarily in the southern and eastern sections of the city.
"Conditions becoming favorable for development of a landspout tornado or two this p.m.," the National Weather Service warned.
There is no guarantee a tornado will form but the potential is there, the weather service said. The advisory is for 1 to 6 p.m.
Landspout tornadoes are not as powerful as most tornadoes, said Nazette Rydell, NWS spokeswoman. They can muster winds between 70 mph to 90 mph, Rydell said.
"They are a very weak tornado," she said. "They'll tear up your chicken coops."
But a landspout tornado won't seem weak to anyone who finds themselves beneath one, Rydell said.
"If a landspout is sighted, take necessary tornado safety precautions and move inside a sturdy structure and stay away from windows," the NWS alert says.