eruption at or near Grímsvötn, was about to
begin, or was already in progress. Immediately,
NCPA upgraded to alert phase and OACC di-
verted all air traffi c to >60 nautical miles (>111
km) distance from Grímsvötn. A volcano-SIG-
MET warning of a signifi cant meteorological
hazard to aviation was broadcast at 2026 UTC,
specifying the likely location and probable
height of the tephra plume
/media/jar/myndsafn/2005EO260001.pdf