When people think of hurricane season, coastal cities from Miami to Mumbai come to mind, but rarely does Anchorage appear in the mental forecast. The question of whether these powerful tropical cyclones ever reach the far northern reaches of Alaska is more nuanced than a simple yes or no. While the state experiences intense winter storms and summer gales, the specific meteorological phenomenon known as a hurricane is exceptionally rare. This is due to the cold ocean temperatures and atmospheric conditions required for tropical systems to form, which are generally absent in high-latitude regions like the Bering Sea and the North Pacific.
Understanding the Science of Tropical Cyclones
To answer whether Alaska gets hurricanes, it is essential to understand what defines a hurricane in the first place. Meteorologically speaking, a hurricane is a type of tropical cyclone that requires very specific environmental ingredients to develop. These include sea surface temperatures of at least 80 degrees Fahrenheit extending deep into the ocean, a pre-existing weather disturbance, high humidity in the lower to mid-levels of the troposphere, and a wind pattern that does not change much with height. The Coriolis effect, which provides the spin, is also too weak near the equator, meaning these storms typically form between 5 and 20 degrees latitude. Alaska, lying mostly north of 50 degrees, simply does not provide the warm, tropical air and water necessary for this process to initiate or sustain itself.
Terminology: Hurricanes vs. Extratropical Cyclones
The confusion often arises from the terminology used to describe powerful storms in Alaska. While the state rarely sees true tropical hurricanes, it is frequently battered by intense extratropical cyclones. These are large-scale low-pressure systems that derive their energy from horizontal temperature contrasts in the atmosphere, rather than the warm ocean water that fuels tropical systems. When a robust extratropical storm moves into the Gulf of Alaska, it can produce hurricane-force wind gusts exceeding 70 knots and torrential rainfall. For this reason, the National Weather Service issues Hurricane Warnings for coastal Alaska regions when these non-tropical systems are expected to produce conditions equivalent to a Category 1 hurricane, even though the storm itself is technically extratropical.
The "Medicane" Exception
While exceedingly rare, there is one phenomenon that blurs the line between tropical and extratropical systems in northern waters. Known as a medicanne or polar low, these are small-scale, intense storms that can resemble a tropical eye. In October 2020, an unusual system dubbed "Medicane" formed in the Mediterranean, featuring a distinct eye wall typically associated with tropical cyclones. While no equivalent has been documented directly off the coast of Alaska, the meteorological conditions that allow for medicanes suggest that in a warming climate, the formation of hybrid systems in higher latitudes could become a topic of increased research. Currently, however, these events remain more of a curiosity than a regular threat to the state.
Historical Impacts and Landfalls There are only a handful of recorded instances where a system classified as a tropical or subtropical cyclone has made a direct impact on Alaska. The most notable occurred in September 1959 when a tropical storm made landfall on the Kenai Peninsula. This event is significant because it demonstrates that the boundary of tropical weather can occasionally reach the state, although these occurrences are separated by decades. Most storms that approach Alaska are remnants of typhoons formed in the Western Pacific. By the time these remnants travel across the globe, they have usually lost their tropical characteristics and merged with the prevailing westerlies, resulting in a potent rain or snow event rather than a hurricane. Regional Climate and Future Considerations
There are only a handful of recorded instances where a system classified as a tropical or subtropical cyclone has made a direct impact on Alaska. The most notable occurred in September 1959 when a tropical storm made landfall on the Kenai Peninsula. This event is significant because it demonstrates that the boundary of tropical weather can occasionally reach the state, although these occurrences are separated by decades. Most storms that approach Alaska are remnants of typhoons formed in the Western Pacific. By the time these remnants travel across the globe, they have usually lost their tropical characteristics and merged with the prevailing westerlies, resulting in a potent rain or snow event rather than a hurricane.
More perspective on Are there hurricanes in alaska can make the topic easier to follow by connecting earlier points with a few simple takeaways.
