Ashfall warning

An Ashfall Warning means that a volcano undergoing a major eruption is creating the likelihood of significant impact on the public (with higher risk to the health of people with respiratory illnesses) and maritime activity due to ashfall accumulation forecast to be greater than or equal to 0.25 inches (6.4 mm), significant debris, lava, or lahar flows.
Example
<pre>
URGENT - MARINE WEATHER MESSAGE
National Weather Service Seattle WA
640 AM PDT Fri May 7 2021
PZZ135-072200-
/O.NEW.KSEW.MH.W.0012.210507T1340Z-210508T0400Z/
Puget Sound and Hood Canal640 AM PDT Fri May 7 2021
...ASHFALL WARNING IN EFFECT UNTIL 9 PM PDT TONIGHT…
* WHAT…Heavy ashfall from the volcanic eruption of Mount Rainer.
* WHEN…Until 9 PM this evening.
* WHERE…Puget Sound and Hood Canal.
* IMPACTS…Falling volcanic ash and debris can cause respiratory
distress in people, and render engines or electronics inoperative.
* ADDITIONAL DETAILS…Additional information is available at
vulcan.wr.usgs.gov.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
An Ashfall Warning means that a volcano undergoing a major eruption
is creating the likelihood of significant impact on the public (with higher
risk to the health of people with respiratory illnesses) and maritime activity
due to ashfall accumulation forecast to be greater than or equal to 0.25 inches
(6.4 mm), significant debris, lava, or lahar flows.
Vessels should consider remaining in port or avoiding the warning area.
Those with respiratory sensitivities should take extra precautions to
minimize exposure. Protect electronics and cover air intakes. Remove
ash from surfaces with water if possible, to prevent excessive
accumulation.
&&
$$
</pre>

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