Satellite Observes Cloud Patterns and Polar Low Over Gulf of Alaska
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NASA's Terra satellite captured images of complex cloud formations over the Gulf of Alaska on March 19, 2026, the final day of astronomical winter. Meteorologists identified a polar low with tropical storm-force winds southwest of Anchorage, while cold Arctic air moving over warm ocean waters created distinctive cloud streets and vortex patterns.
Facts First
- NASA's Terra satellite captured images of cloud formations over the Gulf of Alaska on March 19, 2026.
- A polar low with tropical storm-force winds was identified southwest of Anchorage by meteorologist Matthew Cappucci.
- Cloud streets and Von Kármán vortex streets formed due to cold Arctic air moving over warm ocean water.
- Southern Alaska experienced below-normal temperatures and moderate to heavy snow during the winter of 2026.
- Weather patterns shifted with warming by late April and an approaching atmospheric river bringing wet conditions.
What Happened
On March 19, 2026, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite acquired an image of clouds over the Gulf of Alaska. This date marked the final day of astronomical winter. A NOAA weather briefing stated that low pressure over the Gulf combined with high pressure over eastern Russia and northern Alaska, causing cold Arctic air to move southeast over the Alaska Peninsula. This interaction of frigid, dry air moving over warm ocean water formed cloud streets—parallel bands oriented with the wind direction. As air moved further over the gulf, these cloud streets matured into open-cell clouds. Von Kármán vortex streets, described as trails of staggered, counterrotating swirls, were visible on the lee side of Unimak Island in the Aleutian chain.
Meteorologist Matthew Cappucci identified a large cloud vortex... as a polar low, a small cyclonic formation that develops in cold polar air over relatively warm water. Cappucci wrote that this specific polar low carried tropical storm-force winds and produced snow and thunderstorms around its center.
Why this Matters to You
Satellite observations like these provide critical data for weather forecasting models, which could lead to more accurate predictions for Alaska's frequently volatile coastal weather. Understanding polar lows and atmospheric rivers is important for maritime safety, aviation, and community preparedness in a region where such systems can bring significant snow, wind, and precipitation. The shift from a cold, snowy winter to warmer, wetter conditions by late April 2026 may have affected local travel, outdoor activities, and seasonal industries.
What's Next
The observed atmospheric river approaching Southcentral and Southeast Alaska in late March 2026 likely brought the unsettled, wet weather that was reported. Continued satellite monitoring may help track similar systems in the future. Weather patterns in the region could continue to transition toward spring conditions.