![]() In May, areas from the western Caribbean to the southeastern U.S. The Atlantic hurricane season officially begins June 1, but tropical cyclones occasionally form prior to that date. Tropical cyclones that form in the Eastern Pacific can impact Mexico and Central America and moisture from these systems can reach the southwestern U.S. That's a little earlier than the Atlantic season because sea-surface temperatures are typically warmer and wind shear is usually weaker in the Eastern Pacific compared to the Atlantic earlier in the season. The Eastern Pacific hurricane season officially begins May 15. (MORE: What's Typically The Busiest Three Months For Tornadoes ) May over the last four years illustrates this, since it had 510 twisters in 2019 and then just 126 in 2020. ![]() Of course, these are averages and the actual tornadic outcome can vary in any given year. That's considerably higher than April and June, which, on average, are the second (197) and third (187) busiest months for twisters, respectively. Numerous tornado and severe weather outbreaks have occurred in May.īased on data from 2001 to 2021, the average number of May tornadoes in the U.S. Violent tornadoes are more likely this time of year. In May, the area where these ingredients have the highest chance to come together is from Texas to Iowa. The setup for severe thunderstorms typically includes disturbances in the jet stream pushing out of the Rockies and into the Plains, interacting with warm air and ample moisture. This is the time of year when ingredients for severe thunderstorms come together most often. In most years, May is when the peak of tornado activity occurs in the United States. For many, warmer temperatures are one of the month's highlights as the first signs of summer emerge.īelow, we take a look at five changes that typically occur in the weather in May. The month's tornadic reputation is one of the first weather concerns that comes to mind, but the tropics also have to be watched. May ushers in several notable changes in the nation's weather compared to earlier in the spring. Sign up for the Morning Brief email newsletter to get weekday updates from The Weather Channel and our meteorologists.
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