Polar air masses are not as cold as arctic air, originating over higher latitudes. Tropical air masses have warm and hot temperatures, originating over the lower latitudes.

In other words, the incoming air mass is unusually cold but not record-breaking. After a long, hot summer and fall, Floridians can look forward to nighttime temperatures in the 30s, 40s and 50s.

Maritime Tropical (mT) air is the most unstable type of air mass, primarily because of the warm, moist air it contains. This warm air rises, leading to increased instability in the atmosphere. As ...

This front is a really good lifting mechanism to get storms brewing, oftentimes supercell thunderstorms thanks to the contrast in air masses. As the hot, dry air advances east, it displaces the ...

while the moisture is not impressive, the cold air mass is legit. the 850 mb temperature are expected to drop to the 10th percentile for this time of year, or around the freezing mark.

The warm air courtesy of increased sunshine is trying to move in and replace the lingering cold from last winter. Cold air is denser than warm air, and when they meet, they want to equalize.

Monday will be warm and sticky. A First Alert has been issued for inland communities on Tuesday as brutally hot and humid ...

An arctic air mass is set to sweep across Tennessee, bringing "dangerously cold" temperatures to the state. Below-freezing temps could mean melting snow could refreeze, causing hazardous road ...

In other words, the incoming air mass is unusually cold but not record-breaking. After a long, hot summer and fall, Floridians can look forward to nighttime temperatures in the 30s, 40s and 50s.

In other words, the incoming air mass is unusually cold but not record-breaking. After a long, hot summer and fall, Floridians can look forward to nighttime temperatures in the 30s, 40s and 50s.