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Date: 2015-04-30 13:00 UTC
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Eruption Details:

Volcano ash cloud - User   Thursday 30 Apr 2015 13:00 UTC

Remarks: the 557th ww is issuing this message onbehalf of the washington vaac. the washington vaac is participatingin a monthly scheduled back-up. please be aware that the 557th ww

This data supplements the official Volcanic Ash Advisory Graphics and Volcanic Ash Advisories. The data is to be used with caution. The official Volcanic Ash Graphics and Volcanic Ash Advisories take precedence in all circumstances. Please refer to national NOTAMs for definitive boundaries of no-fly areas.

Altitiude levels (International Standard Atmosphere)

SFC to FL200 - Ash concentrations between the surface and 20,000 feet.
FL200 to FL350 - Ash concentrations between 20,000 feet and 35,000 feet.
FL350 to FL550 - Ash concentrations between 35,000 feet and 55,000 feet.
SFC to 6000FT - Ash concentrations between the surface and 6,000 feet.