Plumes of ash from a major eruption of the Eyjafjallajökull volcano in Iceland led to widespread disruption of air travel throughout Europe for several days.
A storm dropped around 500,000 tonnes of hailstones on Sydney (examples pictured) and the east coast of New South Wales, causing about A$2.3 billion in damages, the costliest natural disaster in Australian insurance history.
Iraqi no-fly zones conflict: In a friendly-fire incident during Operation Provide Comfort, two U.S. Air Force aircraft mistakenly shot down two U.S. Army helicopters over northern Iraq, killing 26 people.
Thousands of Georgians demonstrated in Tbilisi against an attempt by the Supreme Soviet of the Georgian SSR to change the constitutional status of the Georgian language.
After an oxygen tank aboard Apollo 13 (mission patch pictured) exploded, disabling the spacecraft's electrical and life-support systems, astronaut Jack Swigert reported: "Houston, we've had a problem here".