Air Masses
Characteristics of air masses that commonly influence weather in the U.S. and how to identify them on weather maps.

Precipitation Along Fronts
The development of precipitation along warm fronts and cold fronts.

Midlatitude Cyclones
Anatomy of midlatitude cyclones and how to identify them on weather maps.

Coordinated Universal Time (UTC)
Converting back and forth between local time and UTC.

Surface Observation Symbols
Interpreting meteorological data from observation symbols displayed on weather maps.

Current Weather Symbols
Interpreting common weather symbols found on weather maps.

Forecasting Temperatures
Influences of cloud cover, wind, snow cover and advection on forecasting temperatures.

Forecasting Precipitation
Useful indicators for predicting the development of precipitation.