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Great Sitkin: Color Code GREEN Alert Level NORMAL
Local time: November 19, 2019 0550 AKST (November 19, 2019 1450 UTC)
GREAT SITKIN LINKS

SAMPLES

OTHER LINKS

COLOR CODE TIMELINE

CODE DEFINITIONS
GREEN: Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
NORMAL: Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
More information on color/alert definitions
LOCATION
GREAT SITKIN UPDATES
GREEN/NORMAL 09-06-2019 10:29 - Information Statement
GREEN/NORMAL 07-19-2019 13:59 - Weekly Update
GREEN/NORMAL 07-15-2019 11:39 - VAN/VONA
YELLOW/ADVISORY 07-14-2019 11:46 - Daily Update
YELLOW/ADVISORY 07-13-2019 12:39 - Daily Update
YELLOW/ADVISORY 07-12-2019 13:52 - Weekly Update
YELLOW/ADVISORY 07-11-2019 12:23 - Daily Update
YELLOW/ADVISORY 07-10-2019 12:04 - Daily Update

All Great Sitkin Reports

Color Code and Alert Level Definitions

ASHFALL AND ASH CLOUD FORECASTS: MODEL OUTPUT
Mathematical models developed by the USGS, UAF, and NOAA forecast various aspects of how a volcanic ash plume will interact with wind—where, how high, and how fast ash particles will be transported in the atmosphere, as well as where ash will fall out and accumulate on the ground. AVO runs these models when a volcano is restless by assuming a reasonable hypothetical eruption, in order to provide a pre-eruptive forecast of areas likely to be affected. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available. All models use the same input parameters so they are comparable. Click on individual graphics to learn more.
ASHFALL FORECASTS
ASHFALL FORECAST

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REPORTED ASHFALL

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ASH CLOUD FORECASTS (AIRBORNE):
ASH3D CLOUD HEIGHT

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ASH3D CLOUD LOAD

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PUFF CLOUD HEIGHT

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TRAJECTORY FORECASTS:
HYSPLIT TRAJECTORY

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THESE PRODUCTS MAY NOT BE CURRENT.
During an actual eruption, see National Weather Service forecasts of airborne ash hazard to aircraft (SIGMETS: https://weather.gov/aawu/ and Volcanic Ash Advisories: https://weather.gov/vaac) as well as forecasts of ash fall: https://weather.gov/afc.
INSTRUMENT DATA

SELECTED IMAGES
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Great Sitkin index map
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LINKS
Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/activity/GreatSitkin.php
Page modified: November 22, 2017 13:27
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