growth of the current dome. There will likely be additional explosive events during the coming days to months, but their exact nature, as well as timing, remains uncertain. Because the dome sits at the lip of a steep slope leading out of the crater it can become unstable, and (as in 1990) collapse into the Drift River valley, producing avalanches of hot lava blocks, pyroclastic flows, lahars, and ash columns tens of thousands of feet tall, which can carry ash to Alaska communities. During periods between explosions, residents and pilots may also notice occasional sulfur smell and hazy conditions due to low-level ash and volcanic gas emissions. Disruption of oil production and state oil revenue In late May 2009, it was reported that the continued shutdown of oil production in Cook Inlet due to the eruption of Mount Redoubt was costing the state of Alaska approximately US$1.5 million a month in tax revenue. References External links Animation of Mount Redoubt ash clouds, March 25–30, 2009 2009 in Alaska 2009 natural disasters 2009 natural disasters in the United States 21st-century volcanic events Kenai Peninsula Borough, Alaska Volcanism of Alaska Lake Clark National Park and Preserve Natural disasters in Alaska March 2009 events in the United States Redoubt Volcanic eruptions in the United States Plinian eruptions