Current Volcanic Ash Advisories Ospo

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Please Contact Us. Volcanic Ash Advisories (VAA) and Graphics (VAG) links are provided for each message issued. CASCADES VOLCANO OBSERVATORY INFORMATION STATEMENT U.S. Geological Survey Tuesday, September 16, 2025, 10:42 AM PDT (Tuesday, September 16, 2025, 17:42 UTC) Summary: Stong winds are resuspending ash at Mount St. Helens.

There is no change in Volcano Alert Level or Aviation Color Code at this time. Mount St. Helens remains at normal, background levels of activity. Strong easterly–southeasterly winds in the vicinity of Mount St. Helens have picked up loose volcanic ash deposited during the 1980 eruptions and are carrying it to the west–northwest. The resuspended ash has been reported by commercial pilots in the area.

This phenomenon is not the result of recent volcanic activity and occasionally occurs during times of high winds and dry snow-free conditions in the Mount St. Helens area. No eruption is in progress and Mount St. Helens remains at Aviation Color Code GREEN and Alert Level NORMAL. Resuspended volcanic ash should be considered hazardous and could be damaging to aircraft and health. An official website of the United States government

Official websites use .govA .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPSA lock ( Lock Locked padlock icon ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Look for: ash? (VA/EMS), height (SFC/FLxxx), movement (MOV…KT), and whether it’s OBS or FCST. ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE U.S.

Geological Survey Friday, August 22, 2025, 11:07 AM AKDT (Friday, August 22, 2025, 19:07 UTC) Lava continues to erupt at Great Sitkin Volcano. Satellite observations from this week show that lava is erupting from the vent area and spreading slowly south, with some rockfalls occurring along the south and east parts of the dome. All activity remains confined within the summit crater. Occasional small earthquakes and rockfalls, probably from the steep lava flow margins, continue to be detected in seismic data. The current lava eruption began in July 2021 and has filled most of the summit crater and advanced into valleys below.

There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks. Great Sitkin Volcano is a basaltic andesite volcano that occupies most of the northern half of Great Sitkin Island, a member of the Andreanof Islands group in the central Aleutian Islands. It is located 26 miles (42 km) east of the community of Adak. The volcano is a composite structure consisting of an older dissected volcano and a younger parasitic cone with a ~1 mile (1.6 km)-diameter summit crater. A steep-sided lava dome, emplaced in the crater during an eruption in 1974, has been mostly buried by the ongoing eruption.

The 1974 eruption produced at least one ash cloud that likely exceeded an altitude of 25,000 ft (7.6 km) above sea level. A poorly documented eruption also occurred in 1945, producing a lava dome that was partially destroyed in the 1974 eruption. Within the past 280 years a large explosive eruption produced pyroclastic flows that partially filled the Glacier Creek valley on the southwest flank. Following months of decreased signs of volcanic unrest, the Aviation Color Code and Volcano Alert Level were decreased to GREEN/NORMAL on August 20. More details at this link: Spurr VAN/VONA This global 5km Sea Surface Temperature (SST) Anomaly product, displays the difference between today's SST and the long-term average.

The scale goes from -5 to +5 °C. Volcanic Ash Advisories (VAA) and associated Volcanic Ash Graphic (VAG) - VAA are issued every 6 hours or sooner for ash active volcanoes with VAG when ash is detected. The Tropical Cyclone Formation Probability Product provides an estimate of the probability of tropical cyclone formation within the next 24 to 48 hours. This Himawari-9 satellite product provides real-time visible and infrared imagery of the Northern Hemisphere, with a focus on Guam and nearby Pacific Islands. The Office of Satellite and Product Operations (OSPO) is part of the National Environmental Satellite Data and Information Service (NESDIS). NESDIS is part of the National Oceanic and Atmospheric Administration (NOAA), and the Department of Commerce.

OSPO was created by merging the Office of Satellite Data Processing and Distribution (OSDPD) and the Office of Satellite Operations. It is responsible for maintaining the comprehensive scheduling and data information for both Geostationary and Polar orbiting satellites along with providing products derived from the data collected by these satellites.

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