April Tornadoes Set Record in Oklahoma

Timing rather than a trend seems to be the key as to why Oklahoma has broken the state record for tornadoes in the month of April the past two years, according to weather officials.

In April 2011, there were 50 confirmed tornadoes in Oklahoma, breaking a record for that month previously set with 40 in 1957. This April, there were 52 tornadoes.

So do those 102 in two years mean April bypasses May as the month for the biggest threat of twisters in Oklahoma? No, say the experts as they look over the official state records for tornadoes that date to 1950.

Gary McManus, of the Oklahoma Climatological Survey, said that to see a change in the primary tornado season, you have to look at the changes in the ingredients that form tornadoes. The weather patterns that have to come together are complex.

“With severe storms and tornadoes, it’s all driven by very small-scale weather features,” said Rick Smith of the National Weather Service, Norman Forecast Office, “and whether we have four tornadoes or 50 or 100 in a month can be determined by the exact location and behavior of storms on one day, or even just a few hours.”

There have been more tornadoes during April than May in the past two years and in five of the past eight years. However, weather experts look to specifics rather than just the numbers. And when looking at the numbers, consider other changes such a greater opportunity for confirming tornadoes.

“These days, a growing number of chasers track down each and every tornado that might have touched down anywhere in the state,” he said. “And the NWS meteorologists now split tornado tracks into multiples, whereas in the past they might have been counted as one tornado.”

With social media and smartphones that take pictures and video, it’s very unusual to have a tornado occur without weather officials knowing about it, Smith said.

“If you get the right ingredients coming together, you can have tornadoes, and it doesn’t matter if it’s May or November,” Smith said.

“Tornado season in Oklahoma starts on Jan. 1st and ends on Dec. 31st,” Smith said.