The flow occurred at approximately 1:10 am local time, after almost one hour of heavy rainfall. The flow was on the western flank of the volcano and lasted for less than 15 minutes. The flow split into two parts. The larger part travelled towards Lee's Yard, but did not go as far as the flow on 28 July 2008. The other part of the flow travelled in the direction of Plymouth, but stopped before Amersham Estate.
At the time of the flow, the wind was blowing towards the North so there was a strong smell of volcanic gases in most areas of Montserrat. The smell of gases continued to be noticeable throughout the night.
Ashfall was moderate. There was a heavy dusting of dark wet ash in Salem, Olde Town and Olveston. Smaller amounts of ashfall were reported from most of Montserrat, including the airport.
The flow has enlarged and steepened the rockfall gully over the Gages Wall. Because of this, further pyroclastic flows may occur without any warning, especially when there is heavy rainfall.
As the ash dries and residents clean up, the ash will be remobilized in the air. Residents are advised to wear ash-masks when necessary and to take care when driving.
The Hazard Level remains at 3.
Activity Report - 25 August 2008