Ashfall advisory

Weather advisory in the United States

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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

[edit]

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

[edit]

* National Weather Service
* Wildfire
* Volcanic ash

## References

[edit]

1. ^ "NOAA Glossary - Ashfall Advisory". NOAA Website. National Oceanic and Atmospheric Administration.

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Severe weather terminology in the United States

Severe
storms|

| Thunderstorm|

* Advisory
* Watch
* PDS watch
* Warning

|

Tornado|

* Watch
* PDS watch
* Warning
* PDS warning
* Emergency

Marine thunderstorm|

* Special marine warning

Winter
weather|

| Advisories|

* Winter weather advisory

|

Winter storm|

* Watch
* Warning

Blizzard/blowing snow|

* Blowing snow advisory
* Blizzard watch
* Blizzard warning

Heavy snow|

* Warning

Lake-effect snow|

* Advisory
* Watch
* Warning

Snow squall|

* Warning

Ice|

* Freezing rain advisory
* Ice storm warning

Avalanche|

* Warning
* Watch
* Advisory

Tropical
cyclones|

| Tropical storms|

* Watch
* Warning

|

Hurricanes|

* Watch
* Warning

Typhoons|

* Watch
* Warning

Cyclones|

* Watch
* Warning

Storm surge|

* Watch
* Warning

* Hurricane local statement
* Tropical storm local statement
* Tropical depression local statement

Flood|

| Flood|

* Watch
* Warning
* Advisory

|

Flash flood|

* Watch
* PDS watch
* Warning
* Emergency

Coastal flood|

* Advisory
* Watch
* Warning
* Statement

Lakeshore flood|

* Warning
* Advisory
* Watch
* Statement

River flood|

* Advisory
* Watch
* Warning

Urban and small stream flood|

* Advisory

Apparent
temperature|

| Heat index|

* Heat advisory
* Excessive heat watch
* Excessive heat warning

|

Wind chill|

* Cold Weather Advisory
* Extreme Cold Watch
* Extreme Cold Warning
* PDS warning

Extreme cold|

* Warning

Freeze|

* Watch
* Warning
* Hard freeze warning
* Frost advisory
* Hard freeze watch

Maritime
and
coastal
weather|

| Marine winds|

* Small craft advisory
* Brisk wind advisory
* Lake wind advisory

|

Gale|

* Watch
* Warning

Storm|

* Watch
* Warning

Hurricane-force wind|

* Warning
* Watch

Hazardous seas|

* Watch
* Warning

Freezing spray|

* Freezing spray advisory
* Heavy freezing spray watch
* Heavy freezing spray warning

* Marine weather statement
* Rip current statement
* Beach hazards statement

High surf|

* High surf advisory
* High surf warning
* High surf watch

Wind|

| Advisory-force winds|

* Wind advisory

|

Gale-force winds|

* High wind watch
* High wind warning

Major hurricane-force winds|

* Extreme wind warning

Airborne
particulates|

| Dust/sand|

* Blowing dust advisory
* Blowing dust warning
* Dust advisory
* Dust storm warning

|

Fog/Smoke|

* Dense fog advisory
* Dense smoke advisory

Ash|

* Ashfall advisory
* Ashfall warning

Air pollution|

* Air stagnation advisory
* Air quality alert

Fire|

* Red flag warning
* Fire warning
* Evacuation immediate
* Fire weather watch

Aviation|

* SIGMET
* Volcanic ash advisory

Weather scales
used by NWS|

* Beaufort (wind)
* Enhanced Fujita (tornadoes)
* Saffir–Simpson scale (tropical cyclones)

Other|

* Special weather statement
* Severe weather statement
* Hazardous weather outlook

Tsunami|

* Watch
* Warning
* Advisory
* Information statement

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