Severe Storms
Dryline Explained: The Boundary Behind Many Plains Severe Storms
What a dryline is, why it separates dry and moist air, and how it can trigger severe thunderstorms in the Plains.
Quick answer: A dryline is a boundary between dry air and moist air. It can focus thunderstorm development when warm, humid air rises along the boundary.
Where it forms
Drylines are common in the southern and central Plains, often separating desert-influenced dry air from Gulf moisture.
They can sharpen during the day as heating mixes dry air eastward.
Storm trigger
Air may converge and rise along the dryline. If the cap breaks, storms can develop quickly.
Not every dryline produces storms, but when ingredients align, storms can be intense.
Forecast clues
Forecasters watch dew point gradients, wind shifts, heating, upper-level support, and the cap.
A dryline day can shift quickly from quiet to severe if storms initiate.