Weather Dictionary / Glossary of Terms

Volcanic Ash


   Weather TermDescription / Definition
   Volcanic Ash Fine particles of mineral matter from a volcanic eruption which can be dispersed long distances by winds aloft. The chemical composition and abrasiveness of the particles can seriously affect aircraft and also machinery on the ground. If it is blown into the stratosphere and it is thick enough, it can decrease the global temperature.


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Data courtesy of NOAA - National Oceanic and Atmospheric Administration