Cold Air

cold air contracts, warm air expands . Pressure and Temperature cold air contracts, warm air expands ...

Cold Air Mass K Corona In solar-terrestrial terms, of the white-light corona (that is, the corona seen by the eye at a total solar eclipse), that portion which is caused by sunlight scattered by electrons in the hot outer atmosphere of the sun.

Cold air moves over a body of water such as the Great Lakes. Moisture and warmth as picked up from the warmer bodies of water. (Remember, the Great Lakes don't freeze!) That air is now warmer and therefore rises in the atmosphere.

Cold Air Occlusion Symbol: Cold Core Weather Systems: Weather systems with the lowest temperatures at or near the center and gain their energy from the temperature variations within the atmosphere.

Cold air damming: a process in which a shallow cold air mass is carried up the slope of a mountain barrier, but with insufficient strength to surmount the barrier.

Cold air funnel - A funnel cloud or (rarely) a small, relatively weak tornado that can develop from a small shower or thunderstorm when the air aloft is unusually cold (hence the name). They are much less violent than other types of tornadoes.

Cold Air Damming- Cold air damming occurs when a cold dome of high pressure settles over northeastern New England. The clockwise circulation around the high pressure center brings northeasterly winds to the mid Atlantic region.

Cold Air Funnels Cold air funnels are not uncommon in Minnesota, especially in the spring. They are always quite small in scale, short-lived, and hardly ever touch the ground.

A cold air mass that forms in a high-latitude source region. Polar climates(6) Climates in which the mean temperature of the warmest month is below 10C; climates that are too cold to support the growth of trees.

CAA: Cold Air Advection. CEILING: The height of the lowest layer of clouds, when the sky is broken or overcast. CHANCE: A 30, 40 or 50 percent chance of occurrence of measurable precipitation.

CAA- Cold Air Advection, The movement of colder air horizontally toward a fixed point on the earth's surface. CAP- Temperature inversion which prevents convection from occurring.

P1170 Pool of cold air Mass of cold air formed by the spreading out into hollows and valleys of air cooled by nocturnal radiation on neighbouring slopes.

Cold AdvectionTransport of cold air into a region by horizontal winds.Cold Air AvalancheDownslope flow pulsations that occur at more or less regular intervals as cold air builds up on a peak or plateau, reaches a critical mass, ...

StableAn atmospheric state with warm air above cold air which inhibits the vertical movement of air.

COLD AIR FUNNEL Funnel clouds, usually short-lived, that develop from relatively small showers or thunderstorms when the air aloft is very in cold.

TrapperA valley or basin in which cold air becomes trapped or pooled. Travel TimeIn hydrologic terms, the time required for a flood wave to travel from one location to a subsequent location downstream.

A fall wind is a larger-scale phenomenon than the individual-slope scale and is produced by accumulated cold air spilling down a slope or over a mountain range.

These systems are low pressure regions that form where there is a horizontal difference in wind and / or temperature, such as between a cold air mass over Canada and a warm air mass over the southern US.

A cold front occurs when a cold air mass moves into an area occupied by a warmer air mass. Moving at an average speed of about 20 mph, the heavier cold air moves in a wedge shape along the ground.

The cold air from the sea meets the warmer air from the land and creates a boundary like a shallow cold front.

(4): BULK (DOWNWARDS) ADVECTION of cold air due to drag by precipitation elements and by downdraughts in a markedly convective environment.

It is a cold air outbreak associated with the southward movement of a cold anticyclone. It is usually preceded by a warm and cloudy or rainy spell with southerly winds.

Steam Fog It forms as cold air moves over warm water. Water evaporates from the warm water surface and immediately condenses in the cold air above. Heat from the water warms the lower levels of the air creating a shallow layer of instability.

Convection - Warm air rising or cold air sinking or both. Convergence - Convergence in a horizontal wind field indicates that more air is entering a given area than is leaving at that level.

Sheep-chillMeans cold air mostly in the first part of June. At this time sheeps already got shorn and now they feel cold. This sheep-chill is caused by polar air masses and endures a few days.

The leading edge of very cold air moving out from Polar Regions. Arctic Sea Smoke A shallow layer of fog formed when warmer water evaporates quickly into cold air and immediately condenses. e.g. "steam " coming out of a boiling kettle.

Cold Pool - A region of relatively cold air, represented on a weather map analysis as a relative minimum in temperature surrounded by closed isotherms.

Advection Frost - The occurance of frost as a result of the horizontal transport (advection) of a cold air mass with air tempatures below 0'C (32"F) by the wind; may also refer to advection of moisture at subfreezinfg tempatures.

The boundary between a cold air mass that is advancing and a relatively warmer airmass. Generally characterized by steady precipitation followed by showery precipitation. Weather Glossary Search Page Weather Glossary Source List ...

A turbulent state in the atmosphere, often caused by cold air moving over warm air. Unstable conditions are also induced by cold air moving over warm water and by strong heating of the ground by the sun.

Gust Front - a boundary between cold air from the thunderstorm downdraft and warm, humid surface air Gustnado (or Gustinado) - [Slang] a small tornado, usually weak and short-lived, that occurs along the gust front of a thunderstorm ...

Gust Front: The leading boundary of relatively cold air flowing out of a thunderstorm, usually producing gusty winds, a noticeable wind shift and temperature drop when the gust-front passes (similar to a cold front).

COLD FRONT - An advancing mass of cold air. The boundary formed by two air masses where cold air is replacing warmer air. CONDENSATION - A change of state of water from a gas (water vapor) to a liquid.

Arctic front - divides cold air from extremely cold air. Frozen precipitation Diamond dust - fine powdery ice crystals that fall in extremely cold weather, even without clouds.

Arctic (A) Air Mass - A bitterly cold air mass that forms over the frozen Arctic Ocean. Arctic Sea Smoke - A dense and often extensive steam fog occurring over high-latitude ocean areas in winter. Arid - See Desert.

Cold Advection - Transport of cold air into a region by horizontal winds. This transport often acts as a forcing mechanism, particular in the winter, and upward vertical motion may ensue.

DOWNDRAFT A sudden descent of cool or cold air to the ground, usually with precipitation, and associated with a thunderstorm or shower. Related term: updraft DOWNPOUR A heavy rain. Related term: cloudburst ...

Overrunning- The flow of warm air over cold air in advance of a warm front. Ozone- An unstable oxygen compound that is a pollutant at ground level, but that absorbs deadly ultraviolet rays in the stratosphere.

Fog warmed when very cold air drifts across relatively warm water. Arctic Sea-smoke is also known as steam fog, sea mist and water smoke. ATMOSPHERE ...

Cold Front- the leading edge of a cold air mass as it moves toward warmer air; its movement is characterized by a drop in temperature and humidity after the front passes.

The boundary between two different air masses where cold air pushes warm air out of the way and brings colder weather. Condensation: The process by which water vapour becomes liquid water.

It is generally associated with cold air east of the Rockies or Appalachians. It is another name for a ridge, ridge line, or ridge axis. Contrast with a trough. Wedge is also a slang term for a large, wide tornado with a wedge-like shape.

Arctic air mass Mass of very cold air in the Arctic regions which invades lower latitudes at irregular intervals.

cold front: when a colder, higher pressure air mass moves so that cold air replaces warmer air. Storm activity is often associated with the moving in of a cold front.

Ice Fog- Fog that is made up of minute ice particles. It forms in very cold air and is found in polar areas in areas near water vapor where the temperature falls below minus 50 degrees F. Ice Pellets- See sleet.

Cold Front-The discontinuity at the forward edge of and advancing cold air mass that is displacing a warmer and often higher in moisture air mass.

Warm Front Any non-occluded front which moves in such a way that warm air replaces cold air. Water Spout A spout occurring over water; this behavior is characterized by a tendency to dissipate upon reaching shore.

Stationary front: a front between warm and cold air masses that is moving very slowly or not at all.

steam fog—Fog formed when cold air moves over relatively warm water or wet ground.

Front - A boundary between two different air masses, resulting in stormy weather. A front usually is a line of separation between warm and cold air masses.

low pressure- a system in which air pressure decreases toward the center, associated with unsettled weather, usually formed by a mass of warm air being forced up by cold air.

The term implies both poleward displacement of the cyclone and the conversion of the cyclone's primary energy source from the release of latent heat of condensation to baroclinic (the temperature contrast between warm and cold air masses) processes.

frontal inversion A temperature inversion that develops aloft when warm air overruns the cold air behind a front.

See also: Air, Temperature, Weather, Surface, Cloud