Weather Word of the Day
December 3, 2022
Mountain Breeze -
A wind pattern that develops during the night due to differential cooling on the mountain compared to nearby valleys. The mountain cools faster than the valleys in the evening. This cool, dense air blows down the mountainsides into the valleys. The opposite occurs during the day, which produces an upslope wind known as the valley breeze.
December 2, 2022
The mixing of environmental air into a preexisting organized air current or cloud so that the environmental air becomes part of the air current or cloud. Cumulus clouds are subjected to the process of dry air entrainment on their outside edges. This is why cumulus clouds take on a lumpy and jagged form.
December 1, 2022
An instrument attached to a weather balloon that measures atmospheric pressure, temperature, humidity, and wind speed/direction at different layers of the atmosphere. As the instrument rises through the atmosphere, the data is sent via radio waves to a receiver on the ground. Rawinsondes are launched all over the world at specified times. The data from these launches is used in initializing the numerous forecast models.
November 30, 2022
Doppler Effect -
The shift in frequency that occurs when an object goes from moving towards an observer to away from an observer. Everyone has heard this when a police car drives by. As the police car is approaching, the siren will have a high pitch. Then when the police car begins moving away from you the pitch of the siren lowers. This effect is what weather radars use to calculate velocity.
November 29, 2022
Azores High -
Also known as the Bermuda high, this is a large, persistent, atmospheric high-pressure center that develops over the subtropical region of the eastern North Atlantic Ocean. The position of this high will migrate between Bermuda and the Azores Islands throughout the course of a year.
November 28, 2022
Fata Morgana -
A complex mirage that manifests itself by multiple distortions of images, generally in the vertical dimension. Fata Morgana can make distant objects such as a cliff or cottage appear as grandiose as an elaborate castle. The reason for the distortion is due to the refraction of light that can occur when there is cold air near the surface juxtaposed with warmer air just above it.
November 27, 2022
Zonal Flow -
The description that meteorologists use to refer to an orientation of the jet stream that is set up from west to east. A zonal flow pattern is typically characterized by fairly seasonal temperatures and on and off precipitation threats as quick-moving upper level disturbances can be expected from time to time.