A low-level mesoscale boundary or transition zone hundreds of kilometers in length and up to tens of kilometers in width separating dry air from moist air. The length of the dryline is related to larg [..]

A boundary separating moist and dry air masses and an important factor in severe weather frequency in the Great Plains. It typically lies north-south across the central and southern high Plains states during the spring and early summer, where it separates moist air from the Gulf of Mexico (to the east) and dry desert air from the southwestern state [..]

Or Dry Line

A frontal boundary between warm, moist air and warm, dry air. Drylines usually form near the Texas panhandle and move eastward through the day, causing severe thunderstorms in Oklahoma during the spri [..]

a boundary that separates warm, dry air from warm, moist air. This boundary usually represents a zone of instability where thunderstorms often develop due to the mixing of the different types of air.

A boundary which separates warm, dry air