Weather Word of the Day | weatherology°

Weather Word of the Day

October 7, 2026

Green flash - A brilliant green color that can appear on the upper limb of the sun as it rises or sets. It is believed that it occurs due to atmospheric refraction and is most commonly seen at sunset. On rare occasions it has been seen as a green ray of light briefly shooting up from the sun as it rises or sets.

October 6, 2026

DAPE - An acronym that stands for Downdraft Available Potential Energy. This is a measurement of a thunderstorm's ability to produce strong currents of descending air that reach the surface, called downdrafts. Thunderstorms with high levels of DAPE, can produce intense downdrafts that can result in straight-line winds of over 100 mph.

October 5, 2026

Orographic Lifting - The forced rising of air that occurs when winds run into a mountain or any area with notably higher terrain. When moist air pushes against and rises up a mountain, the air cools adiabatically, resulting in clouds and precipitation. This is the reason why higher elevations in the mountains will see greater amounts of precipitation.

October 4, 2026

Chinook (wind) - Chinook winds are commonly experienced in communities that live just downstream of a mountain range. When prevailing winds blow perpendicular to the mountain range, they ascend on the upstream side of the mountain and then descend on the downstream side. When the winds descend down the mountain, the air warms by compression, resulting in rapid upward spikes in temperatures. These winds are referred to as snow eaters, since they result in rapid snow melt during the cold season.

October 3, 2026

Backing wind - Winds that change direction in a counterclockwise sense. This occurs when wind directions turn to the left. An example is when the winds at a specific location turn from the north to the northwest. Backing winds can also refer to how the winds change direction with height. An example of this is when winds at the surface are from the north, while winds aloft are from the northwest.

October 2, 2026

Civil Dusk - The time at which the sun is 6 degrees below the horizon in the evening. At this time objects are distinguishable, but there is no longer enough light to perform any outdoor activities.

October 1, 2026

Cumulus - Puffy white clouds that typically have flat bases and have a limited amount of vertical growth. If they start to grow vertically they can morph into cumulonimbus clouds, at which point they can spawn a thunderstorm.