A slow-moving system will funnel rich Gulf moisture north, interacting with a nearly stationary front. Slow-moving storms will tend to produce extended periods of tropics-style rainfall. Flash flooding will be a major, widespread concern, with river flooding possible in the longer term.
A surge of summer-like humidity will interact with a stationary front to produce strong to severe storms this afternoon. The main threat area will be a narrow zone from Oklahoma northeast through the Ohio Valley. Hotter cells in this zone will drop damaging winds and very large hail.
May Day is celebrated on May 1 and is also a public holiday.
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Another round of severe storms is on the way for Friday afternoon into Saturday morning. The target zone will be a narrow strip from the Southern Plains to the Ohio Valley. Strong winds, large hail, and isolated tornadoes will all be threats! Flash flooding will also become a widespread concern overnight.