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Topic: Nimbostratus

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Altostratus

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Cirrostratus

Altocumulus castellanus

Altocumulus

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Cirrocumulus

Cumulus congestus

Cumulonimbus with mammatus

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	Nimbostratus
		One could say that a nimbostratus is an altostratus (which is a medium high cloud) but is given the name nimbo when the cloud gives precipitation.
		Nimbostratus only exists in connection with a weather front and should not be mixed up with other stratus like cloud layers.
		Well, it is quite light in colour to be a nimbostratus but precipitation all day long in connection with a weather front depicts the cloud.
	www.chitambo.com /clouds/cloudshtml/nimbostratus.html (218 words)

	AMS Glossary
		Nimbostratus is composed of suspended water droplets, sometimes supercooled, and of falling raindrops and/or snow crystals or snowflakes.
		Nimbostratus usually results from the thickening of altostratus to the point where the sun becomes totally indiscernible (Ns altostratomutatus); this point in time usually coincides with the beginning of relatively continuous precipitation.
		Nimbostratus is most easily confused, in identification, with thick masses of altostratus, stratus, or stratocumulus.
	amsglossary.allenpress.com /glossary/search?id=nimbostratus1 (359 words)

	LOW CLOUDS (Site not responding. Last check: 2007-11-06)
		Nimbostratus is a grey cloud layer, often dark, the appearance of which is rendered diffuse by more or less continuously falling rain or snow, which in most cases reaches the ground.
		Nimbostratus generally cover a wide area and are of great vertical extent although not of convective formation.
		Nimbostratus are composed of water droplets (sometimes supercooled)and raindrops, of snow crystals and snowflakes, or of a mixture of these liquid and solid particles.
	www.met.tamu.edu /class/Metr304/Exer10dir/lowclouds.html (402 words)

	Nimbostratus Clouds: dark, low-level clouds with precipitation
		Nimbostratus are dark, low-level clouds accompanied by light to moderately falling precipitation.
		The sun (or moon) is not visible through nimbostratus clouds, which distinguishes them from mid-level altostratus clouds.
		Because of the fog and falling precipitation commonly found beneath and around nimbostratus clouds, the cloud base is typically very diffuse and difficult to accurately determine.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cld/cldtyp/lw/nbstr.rxml (88 words)

	Cloud Classification System
		Nimbostratus can be described as a widespread light grey or white sheet of cloud that produces persistent rain or showers.
		Because of its light colours, nimbostratus lacks contrast and in fact is quite difficult to photograph.
		Because of its lack of contrast, it is difficult to determine the apparent speed and direction of nimbostratus.
	members.tripod.com /~allaboutweather/cloudclassification.htm (5409 words)

	Atlas oblaků
		Nimbostratus se sklává z vodních kapiček (někdy přechlazených) a dešťových kapek, z ledových krystalů a sněhových vloček nebo směsi těchto kapalných a pevných částic.
		Spodní strana nimbostratu je často buď úplně nebo částečně zakryta nízkými roztrhanými oblaky (pannus), které se tvoří v hladině základny nimbostratu nebo pod ní a které rychle mění svůj tvar.
		Nimbostratus se liší od hustého stratu tím, že je hustější a že z něj vypadávají srážky ve tvaru deště, sněhu nebo ledových zrn, zatímco Stratus může dávat srážky (a to jen ojediněle) jen ve formě mrholení, ledových jehliček nebo sněhových zrnek.
	www.mraky.astronomie.cz /nimbostratus.php (352 words)

	USATODAY.com (Site not responding. Last check: 2007-11-06)
		Nimbostratus: These dark gray clouds usually form below 6,000 feet and are almost always associated with continuous light to moderate precipitation.
		Precipitation with a nimbostratus cloud is never the heavy, showery type and often can last for several hours to more than a day.
		Visibility is often very poor below nimbostratus clouds as fog and fast-moving, ragged clouds, known as scud or stratus fractus clouds, form in the precipitation-cooled air below the cloud.
	www.usatoday.com /weather/wstratus.htm (489 words)

	Met Office: CM2 Thick altostratus or nimbostratus
		With further thickening of the altostratus and a lowering of its base, the cloud may eventually become thick enough to mask the sun throughout.
		Altostratus, the greater part of which is sufficiently dense to hide the sun or moon.
		Nimbostratus, a dark grey layer whose base is made diffuse by continuously falling precipitation.
	www.metoffice.gov.uk /publications/clouds/cm2/index.html (247 words)

	Clouds
		The dark cloud type which produce most of our continuous rain is called nimbostratus while most of our showery rain comes from eruption of cumulonimbus.
		Nimbostratus is a dark, deep rainbearing cloud of bad weather.
		Nimbostratus is the cloud of front and depression centres and it contributes most of the winter rains as well as quite a proportion of the summer ones.
	library.thinkquest.org /11641/clouds.htm (1410 words)

	Marine Weather 101
		Nimbo or nimbus might be used with cumulus or stratus to indicate a cloud formation that is producing precipitation.
		Nimbostratus clouds are dark gray with a ragged base.
		Rain or snow is associated with Nimbostratus clouds.
	www.boatsafe.com /nauticalknowhow/weather1.htm (1011 words)

	nimbostratus (Site not responding. Last check: 2007-11-06)
		This is because of the falling rain or snow.
		Nimbostratus clouds should be watched closely because most thunderstorms start with a nimbostratus phase.
		If the nimbostratus cloud is convective, which means it is growing vertically through the upward motion of warm air, then a thunderstorm could develop very quickly.
	snrs.unl.edu /amet351/noehrenberg/nimbostratus.html (49 words)

	Nimbostratus Clouds (Site not responding. Last check: 2007-11-06)
		The word Nimbostratus means "rainstorm" and "spread out" in Latin.
		Rain and snow often accompany the development of nimbostratus clouds.
		Nimbostratus clouds color the sky a solid gray.
	oncampus.richmond.edu /academics/education/projects/webunits/weather/nimbostratus.html (61 words)

	411C: M7, U2, P8: Stratus and Nimbostratus Clouds
		The nimbostratus, somewhat analogous to the cumulonimbus, is a layer cloud that does produce precipitation.
		This is the cloud that we associate with the continuous rains and snows we receive in the winters, in contrast with the very temporary heavy downpours we may experience on summer afternoons from the cumulonimbus cloud.
		Because nimbostratus clouds are associated with extended periods of precipitation, they are effective at cleansing the atmosphere by wet deposition.
	www.shodor.org /os411/courses/411c/module07/unit02/page08.html (354 words)

	Clouds and Cloud Symbols
		Nimbostratus clouds produce rain or snow as a part of general weather systems associated with fronts.
		When it rains or snows all day as a result of a weather system, it is generally from nimbostratus clouds.
		The nimbostratus clouds are mainly low rain clouds.
	www.kean.edu /~fosborne/resources/ex10g.htm (482 words)

	Low Clouds
		Stratus clouds often form along warm fronts and can give way to nimbostratus as the front approaches your location.
		Nimbostratus clouds are dark-gray layer of clouds that cover the entire sky.
		Nimbostratus clouds are typically found along a warm front producing low intensity precipitation that lasts for several hours.
	www.uwsp.edu /geo/faculty/ritter/geog101/textbook/atmospheric_moisture/clouds_3.html (151 words)

	Nimbostratus Clouds - 01/30/98 (Site not responding. Last check: 2007-11-06)
		Nimbostratus clouds are often associated with prolonged periods of light to moderate rain or snow.
		These clouds are often associated with the passage of a warm front.
		Gray dull skies and precipitation will usually persist for several more hours when nimbostratus clouds fill the sky.
	www.rain.org /campinternet/meteorology/nimbostratus.html (45 words)

	The cloud classification system (general)
		With approaching precipitation regions, the lower clouds may appear darker or lighter than the nimbostratus creating some contrast.
		This depends on the intensity of the background nimbostratus.
		The movement of the lower clouds do not necessarily have to be the same as the nimbostratus.
	australiasevereweather.com /techniques/moreadv/class.htm (5094 words)

	Cloud types Summary
		Middle level clouds include altostratus, altocumulus, and nimbostratus clouds that occur between 6500 and 22,000 feet.
		Nimbostratus clouds often appear as heavy, gray, moistureladen cloud layers
		Abbreviation: Ns Nimbostratus clouds tend to bring constant precipitation and low visibility.
	www.bookrags.com /Cloud_types (2040 words)

	Weather & Planning
		There are also seven variations of these basic cloud types that are commonly described: cirrostratus, cirrocumulus, altostratus, altocumulus, nimbostratus, stratocumulus, and cumulonimbus.
		Nimbostratus clouds are often associated with steady precipitation and occur in thick, continuous layers and are often dark gray in color.
		Sometimes, broken smaller nimbostratus clouds line the underside of the nimbostratus layer.
	www.buckeye-illinois.com /winds.htm (495 words)

	EXERCISE 10
		A thick layer of stratus might be comfused with nimbostratus, but the distinction between them can be made by observing the base of the cloud.
		Thin nimbostratus is usually darker gray than thick altostratus and you cannot see the sun or moon through a layer of nimbostratus.
		Visibility below a nimbostratus cloud layer is usually quite poor because rain will evaporate and saturate the air in this region, producing a lower layer of cloud or fog below the original base.
	www.met.tamu.edu /class/Metr304/Exer10dir/exercise10-NO.html (2220 words)

	AIRMAP \| Weather Toolbox \| Cloud Classification
		By convention, code figure 9 is used for Cumulonimbus Mammatus (CBMAM) and those cases in which lightning, thunder, or hail indicates the presence of a CB but the top is hidden by darkness or other clouds.
		Altostratus (AS) or nimbostratus (NS): Predominantly opaque, often associated with long periods of continuous precipitation.
		Altocumulus Castellanus (ACC): Altocumulus in the form of turrets or battlements or AC having the appearance of small cumuliform tufts, with or without altostratus (AS) or nimbostratus (NS).
	www.ccrc.sr.unh.edu /~stm/AS/Weather_Toolbox/Cloud_Classification.html (525 words)

	GISS ICP: How have Clouds been changing in the Northeast and Mid-Western United States? Results (Site not responding. Last check: 2007-11-06)
		Winter nimbostratus cloud amounts over the MW and the winter nimbostratus cloud amounts over the NE seemed similar.
		The winter key rain making clouds (nimbostratus and deep convective - 2 out of the main 3); and the total mean cloud amounts show some interesting trend lines (Fig 4).
		Figure 4: Total Mean cloud amounts for the deep convective and nimbostratus clouds in the winter.
	icp.giss.nasa.gov /research/ppa/2002/clouds/results.html (472 words)

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