Colorado low
Encyclopedia
A Colorado low is a low pressure
storm
that forms in southeastern Colorado
or northeastern New Mexico
, typically in the winter
. After forming, the system moves across the Great Plains
. Colorado lows produce heavy wintry precipitation
, and they have a general east
to northeast movement, impacting regions as far north as Chicago
and as far east as the Atlantic coast
. If upper-level conditions are right, the jet stream
can push the low further south
, bringing wintry precipitation as far as Texas
. When pushed this far south, the system is often referred to as a "blue norther". Winter Colorado lows are responsible for a majority of the snow
that the Midwest receives; however, summer
systems can trigger vast, long-lasting thunderstorms. The Colorado low is similar to the Alberta clipper
.
Low pressure area
A low-pressure area, or "low", is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence which occur in upper levels of the troposphere. The formation process of a low-pressure area is known as...
storm
Storm
A storm is any disturbed state of an astronomical body's atmosphere, especially affecting its surface, and strongly implying severe weather...
that forms in southeastern Colorado
Colorado
Colorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
or northeastern New Mexico
New Mexico
New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
, typically in the winter
Winter
Winter is the coldest season of the year in temperate climates, between autumn and spring. At the winter solstice, the days are shortest and the nights are longest, with days lengthening as the season progresses after the solstice.-Meteorology:...
. After forming, the system moves across the Great Plains
Great Plains
The Great Plains are a broad expanse of flat land, much of it covered in prairie, steppe and grassland, which lies west of the Mississippi River and east of the Rocky Mountains in the United States and Canada. This area covers parts of the U.S...
. Colorado lows produce heavy wintry precipitation
Precipitation
Precipitation may refer to:* Precipitation , rain, sleet, hail, snow and other forms of water falling from the sky* Precipitation , the condensation of a solid from a solution during a chemical reaction...
, and they have a general east
East
East is a noun, adjective, or adverb indicating direction or geography.East is one of the four cardinal directions or compass points. It is the opposite of west and is perpendicular to north and south.By convention, the right side of a map is east....
to northeast movement, impacting regions as far north as Chicago
Chicago
Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...
and as far east as the Atlantic coast
Atlantic Coast
The Atlantic Coast is any coast fronting the Atlantic Ocean. The term differentiates the coasts of countries or continents with coastlines on more than one body of water, such as North America, South America, Africa and Europe.-See also:*Indian Ocean...
. If upper-level conditions are right, the jet stream
Jet stream
Jet streams are fast flowing, narrow air currents found in the atmospheres of some planets, including Earth. The main jet streams are located near the tropopause, the transition between the troposphere and the stratosphere . The major jet streams on Earth are westerly winds...
can push the low further south
South
South is a noun, adjective, or adverb indicating direction or geography.South is one of the four cardinal directions or compass points. It is the opposite of north and is perpendicular to east and west.By convention, the bottom side of a map is south....
, bringing wintry precipitation as far as Texas
Texas
Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
. When pushed this far south, the system is often referred to as a "blue norther". Winter Colorado lows are responsible for a majority of the snow
Snow
Snow is a form of precipitation within the Earth's atmosphere in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by...
that the Midwest receives; however, summer
Summer
Summer is the warmest of the four temperate seasons, between spring and autumn. At the summer solstice, the days are longest and the nights are shortest, with day-length decreasing as the season progresses after the solstice...
systems can trigger vast, long-lasting thunderstorms. The Colorado low is similar to the Alberta clipper
Alberta clipper
An Alberta clipper is a fast moving low pressure area which generally affects the central provinces of Canada and parts of the Upper Midwest and Great Lakes regions of the United States. Most clippers occur between December and February, but can also occur occasionally in the month of November...
.