|CONTINENTAL TROPICAL AIR MASS
METEOROLOGIST JEFF HABY
The source region for cT air is the desert Southwest, the high plains and Mexico with relation to the United States.
dewpoints and warm to hot afternoon temperatures but with mild nighttime temperature. Skies are generally
clear in cT air. This allows daytime heating during the day and radiational cooling at night. The cT air mass is most
prevalent in summer; in the cool season it is not as discernible. Due to the buoyancy and elevation of cT air across
North America, this air will advect into the mid-levels of the atmosphere once it moves out of its source region. This
cap of mild dry air. If this air advects over
PBL mT air, the
severe thunderstorm threat increases
significantly. The boundary of cT is most noticeable with the creation of a
dryline. A dryline separates mT air from
cT air. Depending on the strength of the dryline,
convergence along the dryline and the dynamics above the dryline,
severe thunderstorms can form near a dryline boundary.