Diamond dust (ice needles, frost in the air, frost mist) A type of precipitation composed of slowly falling, very small, unbranched crystals of ice which often seem to float in the air. It may fall from a high cloud or from a cloudless sky.
Rain Foot and Dust Foot driven by microbursts
We are looking west at the south flank of a severe multicell storm that bordered on becoming a supercell at times.
What Caused the Dust Bowl in the US Midwest in the 1930's?
By Rachelle Oblack, About.com
See More About: ...
dust whirl"(Also called dancing dervish, dancing devil, devil, satan, shaitan; and, over desert areas, desert devil, sand auger, sand devil.) A rapidly rotating column of air (whirlwind) over a dry and dusty or shady area, carrying dust, leaves, ...
Dust-storms
Dust-storms are for the most part restricted to the drier inland areas of Australia, but occasionally, during widespread drought, they can affect coastal districts.
Severe Thunderstorms ...
DUST DEVIL: A small, rapidly rotating wind that is made visible by the dust, dirt or debris it picks up. Also called a whirlwind, it develops best on clear, dry, hot afternoons.
Dust Devil - A small atmospheric vortex not associated with a thunderstorm, which is made visible by a rotating cloud of dust or debris (dust whirl).
Dust Devil - a small whirlwind, usually of short duration, that is not associated with a thunderstorm and contains dust, sand, and debris picked up from the ground ...
dust - Solid materials suspended in the atmosphere in the form of small irregular particles, many of which are microscopic in size. It imparts a tannish or grayish hue to distant objects.
Dust Storm- an area where high surface winds have picked up loose dust, reducing visibility to less than one-half mile.
- E -
Ebb Current- the movement of a tidal current away form the coast or down an estuary.
Dust Whirl - A rotating column of air rendered visible by dust.
Dynamics - Generally, any forces that produce motion or affect change.
DUST PLUME
A non-rotating "cloud" of dust raised by straight-line winds. Often seen in a microburst or behind a gust front. If rotation is observed, then the term dust whirl or debris cloud should be used.
Dust devil (or whirlwind) A small but rapidly rotating wind made visible by the dust, sand, and debris it picks up from the surface. It develops best on clear, dry, hot afternoons.
E ...
Dust devil A swirling mass of dust triggered by intense solar heating of dry surface areas.
E
Eddy viscosity Frictional resistance arising from eddies (irregular whirls) within a fluid such as air or water.
Dust that is raised by the wind to heights of six feet or greater. It is reported as "BLDU" in an observation and on the METAR.
BLOWING SAND ...
dust—A type of lithometeor composed of small earthen particles suspended in the atmosphere.
dust devil—A small, vigorous whirlwind, usually of short duration, rendered visible by dust, sand, and debris picked up from the ground.
Dust Devil A small, vigorous whirlwind, usually of short duration, rendered visible by dust, sand, and debris picked up from the ground. They range from 10 feet to greater than 100 feet in diameter, and can extend up to 1000 feet above the ground.
Dust Devils - A small but rapidly rotating column of wind of short duration that is made visible by dust, sand, and debris picked up from the ground. Diameter usually ranges from 10 to 100 feet and develop best on clear, dry, hot afternoons.
BLOWING DUST: Reduction of visibility by strong winds blowing across dry ground with little or no vegetation. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory.
BLOWING DUST Dust that is raised by the wind to heights of six feet or greater. It is reported as "BLDU" in an observation and on the METAR.
Diamond Dust: Ice crystals glittered like diamonds in sun, moon or artificial light. Individual crystals appear to float in the air. Term often used to describe fall of ice crystals from apparently clear sky.
Blowing Dust or Sand
Strong winds over dry ground, that has little or no vegetation, can lift particles of dust or sand into the air.
Blowing Dust (BLDU): Wind-driven dust that significantly reduces surface visibility to less than 7 miles.
Blowing Snow (BLSA): Wind-driven sand that significantly reduces surface visibility to less than 7 miles.
Dust and loose paper raised, small branches moved. Small waves, frequent whitecaps.
13 - 18
5 ...
Dust Devil - Small whirlwinds of dust that form in dry areas like deserts. They may look like tornadoes, but dust devils are not formed by thunderstorms and do not drop from the sky.
Dust devils can be seen by the dust stirred up at ground level, swept up by the secondary flow and concentrated in a central location.
DUST DEVIL - Swirling air that picks up dust caused by thermal lifting rapidly in unstable conditions.
Top of Page
E ...
Dust Devil- A small, whirling column of wind that picks up dirt and other loose material as it travels.
Dust, leaves, and loose paper lifted, small tree branches move
5
17-21 ...
DUST DEVIL - A small convective vortex of warm dry air, common in hot and dry regions. These are characterized by blowing leaves or dust that reveal the vortex presence. The normally are not very dangerous, except to low level aviation concerns.
A dust or sandstorm that forms as cold downdrafts from a thunderstorm turbulently lift dust and sand into the air.
Hail(6) ...
Diamond dust - fine powdery ice crystals that fall in extremely cold weather, even without clouds.
Ice pellets - small hail or sleet type of precipitation.
Graupel - snow pellets - small solid white chunks of snow.
HAZE: Fine dust particles present in a portion of the atmosphere.
HEAT ADVISORY: Issued when the Heat Index is expected to exceed 105 during the day and 80 during the night for at least two consecutive days.
HAZE (H)- Dust, salt and other particles that restricts horizontal visibility.
Owens dust recorder An instrument for rapidly obtaining samples of airborne dust; a type of dust counter.
BlowingA descriptor used to amplify observed weather phenomena whenever the phenomena are raised to a height of 6 feet or more above the groundBlowing Dust or SandStrong winds over dry ground, that has little or no vegetation, ...
Fine dry or wet dust or salt particles dispersed through a part of the atmosphere. Individually, these are not visible, but cumulatively they diminish visibility.
Heat ...
Moderate breeze: dust, loose paper blow about, small branches moved
5
17-21 ...
Whirlwinds See Dust devils.
WHO World Health Organization.
Wind Air in motion relative to the earth's surface.
Condensation nuclei, such as in smoke or dust particles, form a surface upon which water vapor can condense. CLOUD BANK A well-defined cloud mass that can be observed at a distance. It covers the horizon, but is not directly overhead.
DDustD RegionIn solar-terrestrial terms, a daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude.
type of National Weather Service office is responsible for issuing advisories, warnings, statements, and short term forecasts for its county warning areaWFPWarm Front PassageWhirlwindA small, rotating column of air; may be visible as a dust ...
dust, rain, snow, etc.). Obscuring PhenomenaAny atmospheric phenomenon, except clouds, that restricts vertical visibility (e.g., dust, rain, snow, etc.).
particulate matter Very small pieces of solid or liquid matter, such as particles of soot, dust, aerosols, fumes, or mists.
" Observing a fall of dust rain is not difficult, but it helps to have some ideas of what to look out for.
All raindrops form around particles of salt or dust. (Some of this dust comes from tiny meteorites and even the tails of comets.) Water or ice droplets stick to these particles, ...
A rotating "cloud" of dust or debris, near or on the ground, often appearing beneath a condensation funnel and surrounding the base of a tornado.
Cyclone - In general use the term cyclone is applied to any storm, especially violent, small scale circulations such as tornados, waterspouts, and dust devils.
This term is similar to dust whirl, although the latter typically refers to a circulation which contains dust but not necessarily any debris. A dust plume, on the other hand, does not rotate.
One of the primary objectives during the 1999 field campaign was to utilize ships, balloon soundings, aircraft measurements and satellite imagery to assess how much pollution (dust, soot, fly ash, sulfates, nitrates, etc) was in the atmosphere over ...
(Particulate Matter) A major air pollutant consisting of tiny solid or liquid particles of soot, dust, smoke, fumes, and mists.
Blood Rain
Rain of a reddish color caused by dust particles containing iron oxide picked up by the raindrops.
Blowing Snow
Snow raised by the wind to moderate heights above the ground reducing the horizontal visibility at eye level.
In the atmosphere water vapor starts to condense on microscopic particles suspended in the air: dust, soot, volcanic ash, salt spray, etc. These are called cloud-condensation-nuclei.
Raindrops form around particles of dust or salt, join other water droplets or ice droplets and fall when sufficently heavy in the from of liquid or ice, depending on the quantity of collected ice crystals.
Air pollution: Contaminants present in the atmosphere such as dust, gases or smoke.
Albedo: The percentage of light reflected by an object when it is illuminated.
Condensation nuclei - Tiny particles invisible to the human eye, such as dust, dirt, an pollutants, provide surfaces on which water molecules can condense and gather into water droplets ...
Often it is visible only as a debris cloud or dust whirl near the ground. Gustnadoes are not associated with storm-scale rotation (i.e. mesocyclones); they are more likely to be associated visually with a shelf cloud than with a wall cloud.
aerosol: particulate matter put into the atmosphere. Examples are smoke and dust.
air mass: a body of air that has the same temperature, moisture, and stability properties.
Contrast is enhanced by haze, dust, or mist. These rays are more likely to be seen in the late afternoon, as clouds come between the sun and the observer. A similar effect occurs when the sun shines though a break in a layer of clouds.
Funnel Cloud - A funnel-shaped cloud extending from a towering cumulus or cumulonimbus base. It is associated with a towering air column that is not in contact with the ground. If a ground-based debris or dust whirl is visible below the funnel ...
 See also: Air, Cloud, Atmosphere, Water, Weather
|
