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Science Ch 11 Vocab

vocab words

A large body of air covering hundreds or thousands of square kilometers that has a relativly uniform temperature, pressure and humidity. air mass
In Meteorology. a region with relatively uniform temperature and humidity over which air masses form. source region
An air mass that is warmer than the surface over which it moves. warm air mass
An air mass that is colder than the surface over which it moves. cold air mass
A zone of contact between two dissimilar air masses where neither is advancing. It usually results in no change in the weather for several days stationary front
The advancing surface of a warm air mass as it pushes against and over a cooler air mass warm front
The advance surface of a cold air mass as it moves under a warmer air mass. cold front
A line of violent thunderstorm that sometimes accompanies an advancing cold front. squall line
A front formed when a cool air mass and rapidly moving cold air mass trap a warm air mass between them. The warm air mass is lifted, losing all contact with the ground. occluded front
A regional wind system that reverses periodically, alternately bringing wet and dry seasons. monsoon
The horizontal force exerted on a mass of air that has a higher pressure on one side than on the other pressure gradient force
A high-altitude wind that is controlled by the relative influence of the pressure gradient force and the Coriolis effect. geostrophic wind
A weather system centered on a low-pressure area surrounded by a wind circulation pattern spiraling counterclockwise in the Northern Hemisphere. cyclone
An area of relatively higher atmospheric pressure. It typically contains a clockwise rotating wind system in the Northern Hemisphere. anticyclone
A high speed meandering wind current, flowing from west to east jet stream
A breeze that blows onshore from the ocean, usually during the daytime. sea breeze
A breeze that blows from shore to sea, usually at night. land breeze
A breeze that blows up on a mountainside from the valley when air high on the mountain heats and rises. valley breeze
A breeze that flows down the mountain into the valley at night that is caused by cooling air at higher elevations mountain breeze
Consistent winds extending from the subtropical highs toward the equator, turned by the Coriolis effect into easterlies trade winds
Winds blowing consistently from southwest to northeast between 30 and 60 north and south latitudes prevailing westerlies
Winds blowing consistently from northeast to southwest from the northern polar region bringing cold dry air to Asia and North America polar easterlies
A permanent low pressure belt of usually windless air near the equator caused the vertical rising of warm air. doldrums
Bands of nearly permanent high pressure at approximately 30 north or south latitude caused by descending cold air. horse latitudes
The prevailing low pressure belt at approximately 60 north or south latitude subpolar low
An area of high atmospheric pressure at either pole caused by subsiding cold air polar high
A rainstorm that includes lightning and thunder thunderstorm
A towering cumulonimbus cloud that builds rapidly thunderhead
An electrical discharge that occurs either between clouds or between cloud and the ground lightning
Prior to a lightning stroke, a zigzag column of highly ionized air that establishes the chanel for subsequent lightning discharges and return strokes Stepped Leader
A lightning discharge from the ground up to a cloud along the ionized path taken by the original strike from the cloud to the ground Return Stroke
Lightning consisting of branches connected to the main stroke. Forked Lightning
A violent, narrow,rotating funny shaped local windstorm. Tornado
A tornado that occurs over seas Waterspout
In atlantic and Eastern Pacific oceans, a strong, large area cyclonic storm with wind speeds exceeding 117km Hurricane
What hurricanes are called in the Western Pacific and Indian Ocean regions Typhoon
See Cyclone and Hurricane cyclone (Hurricane)
The circular center of low pressure in a hurricane that is characterized by few clouds , relative calm, and vertical air movement Eye
The larger than normal surface waves that proceed outward fron a slow movung hurricane Storm Swell
The large increase in sea level along the shores of a nearby hurricane Storm Surge
A metal rod attached to the highest points of a building Lightning Rod
Created by: Volcomizer