The warm air from the south collides with cold air from the north.
“Throw in lots of moisture from a getting-warmer Gulf of Mexico, and you get an abundance of exuberant weather from Mother Nature,” he said.
Spring is important this year because of the ongoing drought situation. In general, Oklahoma has had two bad springs in a row as far as rainfall goes, McManus said.
That period from April through mid-June is the state's primary rainy season, and it's vitally important to recharge those soils and reservoirs before summer, he said.
The statewide average precipitation is 25.9 inches below normal since Oct. 1, 2010.
“Should we experience a third bad spring in a row,” McManus said, “another full year of drought becomes much more likely, as does the chance for another brutal summer like the last two.
“Spring is also our primary severe weather season, so we have to be mindful of that, of course.”