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11 November 2011

Powerful Storm hits Alaska

(Click on image for larger view.)

A rare, extremely powerful winter storm hit northwestern Alaska on November 8 and 9, 2011, bringing hurricane-force winds, high seas, and heavy snow. Nome, the largest community affected by the storm, was buffeted by winds gusting to 66 miles per hour and a 10-foot storm surge. The National Weather Service reported wind gusts up to 85 miles per hour in Wales, northwest of Nome. Coastal flood warnings were still in effect throughout northwest Alaska on November 10.
The storm was like a hurricane in many ways. The air pressure dropped to dropped to 945 millibars, comparable to a Category 3 hurricane. From above, the storm resembled a hurricane, as well, with bands of clouds spiraling around the low-pressure center. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite took this image at 2:45 p.m. local time on November 8 while the storm was still over the Bering Sea and moving northeast toward Alaska. By November 9, the storm had moved far enough to the north to be beyond the satellite’s view.
Even though the storm resembled a hurricane, its core was full of cold air, not hot air. The storm formed when a stream of warm, moist air from the Pacific Ocean clashed with cold Siberian air and moved over the Bering Sea. Strong winds blowing over a long distance allowed a storm surge to build.
It is the strongest storm to hit northwest Alaska since 1974. As of November 9, no serious injuries or extensive damage had been reported, according to the Anchorage Daily News. However, the storm did damage buildings, flood some roads, and erode beaches. See photos on KNOM Radio Mission’s photostream.
  1. References

  2. Alaska Region Headquarters, National Weather Service. (2011, November 10). Current hazards. National Oceanic and Atmospheric Administration. Accessed November 10, 2011.
  3. Daniel, M. (2011, November 9). Rare, epic-magnitude storm blasts northwestern Alaska. EarthSky. Accessed November 10, 2011.
  4. Hopkins, K., Grove, C., and Dunham, M. (2011, November 10). Alaskans weather epic Bering Sea storm. Anchorage Daily News. Accessed November 10, 2011.
  5. Israel, B. (2011, November 8). Where did the dangerous Alaska storm come from? Our Amazing Planet. Accessed November 10, 2011.
  6. Joling, D. (2011, November 9). Snow, hurricane-force winds batter Alaska coast. Associated Press. Accessed November 10, 2011.
  7. National Centers for Environmental Prediction Hydrometeorological Predication Center. (2011, November 9). Storm summary message. National Oceanic and Atmospheric Administration. Accessed November 10, 2011.
  8. Samenow, J. (2011, November 9). Alaska storm brings epic wind, waves, coastal flooding and snow. Capital Weather Gang. Washington Post. Accessed November 10, 2011.
NASA Earth Observatory image created by Jesse Allen, using data obtained from the Land Atmosphere Near real-time Capability for EOS (LANCE).