Weather Systems & Cloud Types. Air Masses. Bodies of air that bring distinctive weather features to the country. A mass of air in air that is very uniform in temperature, pressure, and humidity. Polar = cold Tropical = warm Maritime = moist Continental = dry.
A front is the transition zone between
two air masses of different density.
Fronts extend not only in the horizontal direction,
but in the vertical as well.
Unusually warm ocean temperatures in the Equatorial Pacific
Winters are warmer than normal in the Northern States &
cooler than normal in the Southern States
Unusually cold ocean temperatures in the Equatorial Pacific
Winters are cooler than normal in the Northwest &
warmer than normal in the Southeast