Washington might not be in Tornado Alley, but it experiences its share of tornadoes.
The National Weather Service reports that Washington averages about 2.5 tornadoes per year. These storms are usually less severe compared to the ones in more tornado-prone areas.
Even with their rarity and lower intensity, tornadoes in Washington can still cause significant damage and concern among residents.
Since 1950, the National Oceanic and Atmospheric Administration has been tracking tornado activity in Washington.
Most of these tornadoes fall into the EF0 to EF2 categories, implying relatively weak storms. This historical data shows that while tornadoes aren’t common in Washington, they are a recurring weather phenomenon.
In December 2018, a stronger tornado hit Port Orchard, highlighting the unpredictable nature of these storms.
Such events make it clear that while Washington may not be known for tornadoes, being prepared for sudden weather changes is crucial.
Understanding Washington’s Tornado Climate
Washington state experiences fewer tornadoes than many other parts of the United States. These tornadoes occur mostly in specific seasons, have varying levels of intensity, and are influenced by the state’s unique geography.
Seasonal Tornado Patterns
In Washington, tornadoes most often occur in the spring and fall. The months of May and June see the highest activity, likely due to transitions in atmospheric conditions.
While summer can also bring tornadoes, their frequency is lower. Winters rarely experience tornadoes, but the Pacific Northwest’s diverse weather patterns can sometimes lead to unexpected events.
Tornado Classification and Intensity
Tornadoes in Washington are generally less intense compared to those in the Midwest or South.
They are often ranked as EF0 or EF1 on the Enhanced Fujita Scale.
An EF0 tornado has wind speeds of 65-85 mph, while an EF1 ranges from 86-110 mph.
Occasionally, stronger tornadoes reaching EF2 intensity (111-135 mph) can occur, though EF3 or higher events are rare.
Effect of Geography on Tornado Occurrence
Washington’s geography plays a crucial role in its tornado frequency. The state’s varied landscape, including the Cascades and the Rockies, influences weather conditions.
Areas west of the Cascades, such as Puget Sound, experience more tornadoes due to unique wind patterns and surface movement.
Meanwhile, eastern regions, sheltered by the mountains, tend to have fewer tornadoes. This geographic variation helps explain the lower yearly average of tornadoes in Washington.
Historical and Current Tornado Data in Washington
Washington State experiences relatively few tornadoes compared to tornado-prone areas like Tornado Alley. However, historical data reveals notable events. Analyzing trends helps understand tornado risks in the state.
Significant Tornado Events
Washington has seen several noteworthy tornadoes since 1950. One of the most significant was on April 5, 1972, in Vancouver, which caused substantial damage.
In December 2018, a tornado ripped through Port Orchard.
The National Weather Service reports about 2.5 tornadoes annually in Washington, making it less prone compared to states like Texas or Kansas.
Tornado Data Analysis and Trends
The National Oceanic and Atmospheric Administration has tracked tornadoes in Washington extensively.
Although the state’s annual average is low, some regions like the Puget Sound area have been hit hard.
In recent decades, data shows no significant increase in tornadoes, as many occur in the south or east of the state.
Tornadoes in December are extremely rare, with only one EF-2 or greater storm recorded besides the 1969 tornado near Des Moines and Kent.
Future Tornado Risk Assessment
Predicting tornadoes remains challenging due to the unpredictable nature of these storms.
However, regions with higher population density or significant storm history, like Seattle, face greater risks.
The National Weather Service and the Storm Prediction Center play crucial roles in forecasting and mitigating tornado hazards.
Tools like interactive maps help the public stay informed about potential dangers, and improved observation technologies continue to advance tornado prediction efforts in Washington.