Dark blue cloudy sky

What is Trough?

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms and rain.

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Glossary

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

The names given to the winds blowing from the four cardinal directions (north, east, south, and west - N, E, S, W) on a compass.

A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

A middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...