Tornado Season in Alaska

Alaska has no tornado season to describe: across 1996 to 2025 it recorded 4 tornadoes in 3 of the 30 years, too few for a calendar. What pattern exists is that June holds more of the record than any other month, and this page shows the whole record.

Alaska recorded 4 tornadoes over the 30 years from 1996 to 2025, which works out at 0.1 a year, spread over 0.1 tornado days a year. 0 were rated EF2 or stronger, the bar the Storm Prediction Center calls a significant tornado, and 0 reached EF4 or EF5. Every tornado in the Alaska record carries a rating. These are counts of tornadoes, not of database rows: the SPC file stores long tracks as several segments and this site counts each tornado once per state it touched.

The strongest Alaska tornado in this window was rated EF0 on 2024-04-19, with a path 0.01 miles long. The National Weather Service pairs a EF0 rating with estimated 3 second gusts of 65-85 mph. A rating is a damage survey verdict, not a measurement: in the NWS's own words, "The EF scale still is a set of wind estimates (not measurements) based on damage." No tornado deaths appear in the Alaska record for this window.

essentially none of Alaska's tornadoes in this window touched down between 9 pm and 6 am local standard time (0 percent), and the single busiest hour of its day is the one beginning at 3 pm. The night share is worth knowing because it varies enormously by region: near zero on the high plains, where storms live and die with afternoon heating, and around three in ten in the Gulf South, where tornadoes ride overnight squall lines. These hours come from converting the database's Central Standard timestamps to each tornado's approximate local standard time using its longitude.

The National Weather Service's own definitions, in short: a watch means be prepared, a warning means take action. Verbatim: "Tornado Watch: Be Prepared! Tornadoes are possible in and near the watch area. Review and discuss your emergency plans, take inventory of your supplies and check your safe room. Be ready to act quickly if a warning is issued or you suspect a tornado is approaching. Acting early helps to save lives! Watches are issued by the Storm Prediction Center for counties where tornadoes may occur. The watch area is typically large, covering numerous counties or even states." And: "Tornado Warning: Take Action! A tornado has been sighted or indicated by weather radar. There is imminent danger to life and property. Move to an interior room on the lowest floor of a sturdy building. Avoid windows. If in a mobile home, a vehicle, or outdoors, move to the closest substantial shelter and protect yourself from flying debris." This page reads both live from api.weather.gov and shows them exactly as issued.

The record cannot answer that. The Storm Prediction Center is blunt about its own database: "Tornado reports have increased, especially around the installation of the NEXRAD Doppler radar system in the mid 1990s. This doesn't mean that actual tornado occurrence has gone up, however." The growth is almost entirely in weak tornadoes that better radar, more chasers and more cameras now document. That is why this site computes everything inside the Doppler era (1996 to 2025) and leads with tornado days rather than raw counts.

The NOAA Storm Prediction Center Severe Weather Database, the National Weather Service's own record of every United States tornado since 1950, which is a US Government work in the public domain. These pages use the 1996 to 2025 window and count tornadoes rather than database rows: the file stores each long track as several segments, and the counting rule is verified against SPC's own de-segmented file at build time. County names come from the US Census Bureau. Live warnings come from api.weather.gov and are shown verbatim.

Alaska recorded tornadoes on 0.1 days in an average year and in 3 of the 30 years, against Oklahoma's 16 days every single year. At that frequency a monthly distribution is mostly noise, a peak week is an accident of the sample, and a season window would imply a regularity the record does not show, so this page counts what happened and names the strongest and longest on record.