Ashfall advisory
Weather advisory in the United States
An Ashfall advisory is a weather advisory issued by the National Weather Service of the United States. Ashfall advisories are issued when there is a likely future or present occurrence of ash rain caused by a large plume of suspended airborne ash, typically caused by large fires or volcanic activity.[1] The National Weather service map color is Dark Grey.
Ashfall Advisories are often accompanied with special weather statements.
Example of an ashfall advisory
URGENT - MARINE WEATHER MESSAGE...CORRECTED National Weather Service Honolulu HI 708 AM HST Thu May 17 2018 ...ASHFALL ADVISORY IN EFFECT... Ash from Kilauea Volcano will affect waters east through south of the Big Island. PHZ122-124-172200- /O.COR.PHFO.MH.Y.0001.180517T1700Z-180517T2200Z/ Big Island Windward Waters-Big Island Leeward Waters- Big Island Southeast Waters- 708 AM HST Thu May 17 2018 ...ASHFALL ADVISORY IN EFFECT UNTIL NOON HST TODAY... The National Weather Service in Honolulu has issued an Ashfall Advisory, which is in effect until noon HST today. * ERUPTION...Kilauea Volcano Summit (19.4N 155.3W) occurred at about 415 am HST. Additional eruptions may occur the rest of this morning. * LOCATION...Volcanic ash is expected to affect waters adjacent to but especially downwind of Kilauea Volcano. * TIMING...This advisory is in effect until 12 pm HST this afternoon. The advisory may need to be extended if volcanic ashfall persists. * IMPACTS...Ash accumulation of less than one quarter inch is possible on vessels in the advisory area. Mariners should avoid this area until the ashfall subsides. PRECAUTIONARY/PREPAREDNESS ACTIONS... For more information on the current status of Kilauea Volcano, see https://volcanoes.usgs.gov/volcanoes/kilauea/status.html
See also
- National Weather Service
- Wildfire
- Volcanic ash
References
- ^ "NOAA Glossary - Ashfall Advisory". NOAA Website. National Oceanic and Atmospheric Administration.
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Severe weather terminology in the United States
storms
Thunderstorm |
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Tornado |
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Marine thunderstorm |
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weather
Advisories |
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Winter storm | |
Blizzard/blowing snow | |
Heavy snow | |
Lake-effect snow | |
Snow squall | |
Ice | |
Avalanche |
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cyclones
Tropical storms | |
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Hurricanes | |
Typhoons |
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Cyclones |
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Storm surge |
- Hurricane local statement
- Tropical storm local statement
- Tropical depression local statement
Flood | |
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Flash flood | |
Coastal flood | |
Lakeshore flood |
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River flood | |
Urban and small stream flood |
temperature
Heat index | |
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Wind chill | |
Extreme cold | |
Freeze |
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and
coastal
weather
Marine winds | |
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Gale | |
Storm | |
Hurricane-force wind | |
Hazardous seas | |
Freezing spray |
- Marine weather statement
- Rip current statement
- Beach hazards statement
Advisory-force winds | |
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Gale-force winds | |
Major hurricane-force winds |
particulates
Dust/sand |
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Fog/Smoke | |
Ash |
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Air pollution |
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- Red flag warning
- Fire warning
- Evacuation immediate
- Fire weather watch
used by NWS
- Beaufort (wind)
- Enhanced Fujita (tornadoes)
- Saffir–Simpson scale (tropical cyclones)
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