A warm-cold air boundary with the cold air advancing.

Water as a liquid or solid that falls to Earth. Includes rain, snow, sleet, hail, and freezing rain.

These are thin, wispy clouds that look like feathers or horse tails. They form high in the Troposphere above 5km. They point in the direction the wind is blowing. These clouds are a sign of clear fair weather.

Prefix or suffix added to the cloud name to indicate that the cloud is producing precipitation.

A warm-cold boundary with neither cold nor warm air advancing.

These are dark grey clouds that cover the sky. They are low clouds that can be found at an altitude of 2 km to less than 1 km. They may produce light to moderate precipitation.

Clouds that appear as large cotton balls in the sky. They are low clouds at an altitude of 2 km to less than 1 km. Most of the time they bring fair weather.

An explanation of weather conditions that will most likely occur in the following days. This is based on weather data, patterns and conditions in the atmosphere.

The amount of water vapor in the atmosphere.

A warm-cold boundary with the warm air advancing.

A boundary between cool and cold or warm and hot air masses.