Alaskans and air travelers are on alert as a volcano erupts
Mount Pavlof, Alaska (CNN) - This is what the Pavlof volcano looked like Thursday.
It's sending a cloud of smoke and ash extending up to 60 miles from its Aleutian island range.
Geologists are also observing a lava fountain -- that is, jets of lava shooting into the air from the crater.
Pavlof and the neighboring Mount Cleveland volcano started rumbling earlier this week.
Pilots in the area are being warned of possible smoke.