In this image made available by the Icelandic Coastguard taken Wednesday April 14, 2010, smoke and steam rises from the volcano under the Eyjafjallajokull glacier in Iceland, which erupted for the second time in less than a month, melting ice, shooting smoke and steam into the air and forcing hundreds of people to flee rising floodwaters. Authorities evacuated 800 residents from around the glacier as rivers rose by up to 10 feet (3 meters). Emergency officials and scientists said the eruption under the ice cap was 10 to 20 times more powerful than one last month, and carried a much greater risk of widespread flooding.(AP Photo/Icelandic Coastguard, ho) **EDITORIAL USE ONLY**
Michael Brown, a duty manager at SFO, said two flights to London's Heathrow Airport were canceled on Wednesday because of the eruption. The volcano Eyjafjoll in southern Iceland began erupting late Tuesday, the U.S. Geological Survey shows.
A British Airways flight that departed SFO for Heathrow on Wednesday evening returned to the Bay Area at around 2:45 a.m. because of the ash cloud, Brown said. Airports in Ireland and Nordic countries have also been closed because of the ash cloud.
Travelers are advised to check with airlines to confirm travel plans. So far, flights from Mineta San Jose and Oakland international airports, have not been affected. Neither of those airporrts offer direct flights to Europe.
The FAA is working to reroute some flights.
Check out this awesome video of the volcano: