Strong wind and dry weather are an ideal combination for ash/dust storms.
Windspeed at Kvísker (figure below) and Kirkjubæjarklaustur well over 15 m/s and even stronger gusts.
Data from the IMO web site.
Satellite image take at 14:20 on 10 September (MODIS/NASA Rapidfire via IMO). Clearly visible broad plume of ash/dust reaching to the south-east.
Satellite image taken at 15:05 on 11 September 2012 (MODIS/NASA Rapidfire via IMO).
