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Topic: Shelf Cloud

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	Shelf cloud - Wikipedia, the free encyclopedia
		A shelf cloud is a low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms).
		Unlike a roll cloud, a shelf cloud is attached to the base of the parent cloud above it (usually a thunderstorm).
		Generally speaking, a shelf cloud appears on the leading edge of a storm, and a wall cloud will usually be at the rear of the storm.
	en.wikipedia.org /wiki/Shelf_cloud (174 words)

	CJ's Place of Interests - Thunderstorms (Site not responding. Last check: 2007-10-31)
		Shelf clouds and roll clouds are examples of "accessory clouds" that you may see beneath the cloud base of a storm.
		A shelf cloud may also appear to the southwest of a wall cloud in association with a phenomena called the rear flank downdraft (which will be discussed later).
		Shelf clouds tend to slope downward away from the precipitation while wall clouds tend to slope upward away from the precipitation area.
	www.midtel.net /~cjworeth/thunder2.html (1949 words)

	Untitled Document
		A shelf cloud is a low-level horizontal arcus-type cloud that appears to be wedge-shaped as it approaches.
		It is an extension of the main cloud and the underside is concaved upward, turbulent, boiling, or wind-torn.
		Shelf clouds are formed when the rain cooled air beneath a thunderstorm sinks, hits the ground, and fans out in all directions.
	www.ukspeedtraps.co.uk /weather/shelf.htm (262 words)

	Wall Clouds and other Lowerings
		Shelf clouds and roll clouds are examples of "accessory clouds"you may see beneath the cloud base of a storm.
		Shelf clouds signify an area of downdraft and outflow while wall clouds indicate an area of updraft and inflow.
		Shelf clouds tend to slope downward away from the precipitation while wall clouds tend to slope upward awayfrom the precipitation area.
	www.tsgc.utexas.edu /stars/tscloud.html (521 words)

	StormSpottersGlossary (Site not responding. Last check: 2007-10-31)
		Frequently used as a synonym for a wall cloud although it actually is a generally circular ring of cloud surrounding the upper portion of a wall cloud.
		Motions in the tail cloud are toward the wall cloud with rapid updraft at the junction of tail and wall cloud.
		This horizontal cloud is not a funnel or tornado.
	members.aol.com /rscswp/PageF1.htm (1867 words)

	Identifying Clouds
		Shelf clouds are an indication of outflow, normally where advancing cold air meets warm air, ploughing forward forcing it to rise.
		This and the shelf cloud should not be confused with a wall cloud.
		These cloud formations usually occur on the rear side of the storm in the overhanging anvil although they can be seen at the leading edge as well.
	www.on.ec.gc.ca /canwarn/clouds-e.html (1014 words)

	Wx Savvy \| Shelf Clouds
		A shelf cloud resembles it's name of course, and is defined as a low cloud and horizontal (not vertically prominent like many storm clouds).
		A shelf cloud is usually curved or semicircular and sticks out like a shelf from a parent cloud (usually a thunderstorm cloud).
		I wanted to explain the reason for the gusty winds because a shelf cloud is associated with those gusty winds and is created by the outflow of the storm.
	weathersavvy.com /Q-Clouds_ShelfCloud.html (286 words)

	Shelf Cloud: slopes downward and away from the rain area (Site not responding. Last check: 2007-10-31)
		Shelf Cloud: slopes downward and away from the rain area
		This is the first of four photographs of an approaching thunderstorm to help visualize the difference between gust front outflow "push" and wall cloud inflow "pull." To the distant west-southwest, note the suspicious cloud lowering at the south flank of an isolated severe thunderstorm.
		Is it a wall cloud or a portion of a shelf cloud?
	ww2010.atmos.uiuc.edu /(Gh)/wwhlpr/shelf_cloud.rxml?hret=/indexlist.rxml (132 words)

	Summer Refresher
		However, in contrast, true funnel clouds will display persistent, organized, rotation on a vertical, or nearly vertical axis, and typically, weather conditions on the front side of a storm near or under the shelf cloud are not conducive to tornado formation.
		Wall clouds are an obvious lowering of the rain-free base of a storm, and tend to form on the backside of a thunderstorm cell, relative to the thunderstorm movement.
		Rotating wall clouds are compact in width (in contrast to the shelf cloud), usually 1 to 4 miles in width, and look like a big, flat thumb, or a rain-barrel, or a shirt collar that is attached to the nearly rain-free base of the storm in the early stages.
	mke-skywarn.org /refresher.htm (1109 words)

	Cloud Chart
		These clouds will form halos around the sun, and many times, a halo is the only indication of their presence.
		Shelf clouds are usually immediately followed by gusty winds, and sometimes heavy rain and/or hail.
		Wall clouds can range from a fraction of a mile to five miles in diameter and are usually located on the southwest portion of a thunderstorm under the updraft base.
	www.geocities.com /stormchsr77/Chart.html (725 words)

	SKYWARN Storm Spotter Guides Online
		The beaver's tail is another significant type of cloud band The beavers tail is a smooth, flat cloud band that extends from the eastern edge of the rain free base to the east or northeast.
		A shelf cloud may also appear to the southwest of a wall cloud in association with a phenomena called the rear flank downdraft (RFD).
		Small cloud elements in or near the wall cloud will have these characteristics (and some tornadoes do not form from wall clouds), but these four characteristics are good rules of thumb to follow.
	spotterguides.us /advanced/advanced06.htm (2923 words)

	Roll Cloud vs. Shelf Cloud- Weathersavvy
		A shelf cloud resembles it's name of course, but in more detail it is a low cloud and horizontal (not vertically prominent like many storm clouds).
		So basically the shelf cloud is a result of thunderstorm downdrafts spreading out into and lifting up relatively warm and moist air.
		Unlike shelf clouds, roll clouds are completely unattached from a parent storm cloud.
	weathersavvy.com /Q-Shelf_Roll_Clouds1.html (522 words)

	Wall cloud - Wikipedia, the free encyclopedia
		In the special case of a supercell thunderstorm, the wall cloud will often be seen to be rotating.
		It is the area of the thunderstorm which is most likely to produce tornadoes.
		They can extend from a being a fraction of a mile wide to over five miles across, and typically form at the south or southwest end of a supercell mesocyclone.
	en.wikipedia.org /wiki/Wall_cloud (170 words)

	USATODAY.com - Answers archive: How to find out what kind of cloud you saw (Site not responding. Last check: 2007-10-31)
		If it were a roll cloud from a severe storm, the storm could have produced high winds, large hail, or a tornado away from where you were.
		Roll clouds are like a shelf clouds, they are along an outflow area of a thunderstorm, but they do roll..
		Saying a cloud is a shelf cloud is almost like saying a person is a "40-year-old, white male." That is, shelf clouds don't all look the same, but they do have some noticeable characteristics in common.
	www.usatoday.com /weather/resources/askjack/2003-03-14-identifying-clouds-_x.htm (587 words)

	CLOUD TYPES
		The funnel cloud is the visible portion of a tornado produced from clouds.
		A funnel cloud is not a tornado if the circulation is not in contact with the ground.
		These clouds are located 75 to 90 kilometers above the surface and are rarely seen due to their extremely low moisture density.
	www.theweatherprediction.com /clouds (705 words)

	Spotter Glossary
		A low-level horizontal accessory cloud that frequently appears to be wedge-shaped as it approaches.
		A low tail-shaped cloud extending outward from the northern quadrant of a wall cloud.
		A local storm (accompanied by lightning and thunder) produced by a cumulonimbus cloud, usually with gusty winds, heavy rain, and sometimes hail.
	www.angelfire.com /mi/adamsherman/glossary.html (1903 words)

	Severe Weather Phenomenon
		Shelf Cloud - A low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms).
		Cloud motion in the tail cloud is away from the precipitation and toward the wall cloud, with rapid upward motion often observed near the junction of the tail and wall clouds.
		Compare with beaver tail, which is a form of inflow band that normally attaches to the storm's main updraft (not to the wall cloud) and has a base at about the same level as the updraft base (not the wall cloud).
	www.met.tamu.edu /class/Metr304/Severedir/dictionary-s-z.html (5487 words)

	Scud Climate glossary - Flags, Maps, Economy, Geography, Climate, Natural Resources, Current Issues, International ...
		Striations - Grooves or channels in cloud formations, arranged parallel to the flow of air and therefore depicting the airflow relative to the parent cloud.
		Striations often reveal the presence of rotation, as in the barber pole or "corkscrew" effect often observed with the rotating updraft of an LP storm.
		Visual characteristics often include a rain-free base (with or without a wall cloud), tail cloud, flanking line, overshooting top, and back-sheared anvil, all of which normally are observed in or near the right rear or southwest part of the storm (Fig.
	www.geographic.org /climate/s.html (1368 words)

	Glossary (Site not responding. Last check: 2007-10-31)
		The cumulus cloud is the first stage of a developing thunderstorm.
		The tornado is most often found in the southwest quadrant of the storm, near the trailing edge of the cumulonimus cloud.
		Tornadoes and funnel clouds are usually pendant from wall clouds or directly from the thunderstorm base, within a few miles to the southwest of the precipitation shaft.
	www.movies.warnerbros.com /twister/cmp/glossary.html (1359 words)

	oldstorms2
		This feature shifts between wall cloud and shelf cloud characteristics rather rapidly as the intake area first firms up with a weak rotation then gets undercut by outflow and becomes shelf cloud like in appearance.
		This was the wall cloud stage drawing dirt laden air in from the outflow to the north side of the intake area.
		While a little too far away for definite details, the 'funnel' did not seem to be rotating and the dust was tending to push on south of the feature and it soon dissipated.
	www.angelfire.com /tx/dwphome/oldstorms2.html (514 words)

	Cloud - Wikimedia Commons
		Clouds, as viewed from a plane, flying from Pittsburgh to New York La Guardia.
		Cloud on the Hvannasund on the sea surface
		Cloud development not observed or not observable during past hour (not plotted)
	commons.wikimedia.org /wiki/Cloud (338 words)

	Spotter
		The Wall Cloud is usually in the southwest portion of the storm within several miles of the rain area.
		The Wall Cloud is located in the southwest quadrant of the storm, and formed 30 minutes prior to the tornado.
		When the scud is attached to the cloud base as in Figure 20, it is very difficult to distinguish it from a wall cloud or tornado.
	www.moundweather.com /spotter.htm (4416 words)

	Holy ***, I just got owned by a WALL CLOUD. - dyestat.com Forums (Site not responding. Last check: 2007-10-31)*
		From the west, an extremely dark, emmense cloud with a shear face was moving towards the lake.
		Wall clouds are lowerings in the storm base, where there is a strong updraft/downdraft point.
		This storm had a sharp leading edge which produced the cloud that you saw--which in fact was a shelf cloud.
	www.dyestat.com /forum/showthread.php?t=4906 (946 words)

	BSCH - Gustnado and Spectacular Shelf Cloud Chase - November 6, 2000
		Reports of a "great shelf cloud" from Anthony Cornelius mid afternoon, who was chasing SW of Brisbane, raised my hopes of an interesting afternoon as a squall line became more and more organised on radar.
		As i made my way there, a very long shelf cloud can into view, with precipitation on the southern and northern end, and little or no precipitation between them.
		I tried to continue north and stay out of the rain, but heavy traffic slowed me down, and by the time i got to a lookout i was under the shelf cloud, and rain started falling.
	www.bsch.au.com /storm_chasing/06_11_00bq.shtml (587 words)

	Funnel Cloud Over NW Gainesville (Site not responding. Last check: 2007-10-31)
		Florida clouds are so much different from those in the midwest, and it makes identifying things really difficult when all the spotting books use the midwest storms for reference.
		It is not a wall cloud, but part of the gust front shelf cloud.
		The funnel cloud position is to the northwest.
	www.afn.org /~afn09444/weather/wxphotos/more4.html (1896 words)

	Clouds
		A shelf cloud passes overhead near Buffalo, South Dakota.
		A lonely windmill stands testament to cumulus and cumulus fractus clouds in the Sand Hills region of Nebraska.
		A shelf cloud passes overhead in Kay County, Oklahoma.
	members.cox.net /rprentice/clouds.htm (239 words)

	Shelf clouds
		A shelf cloud is similar to lenticularis cloud, but on a much larger scale.
		A shelf cloud sometimes forms ahead of a severe, long-lasting thunderstorm such as a mesoscale convective system (MCS), multicell or supercell.
		The shelf cloud is usually accompanied by a gustfront and sometimes also a roll cloud.
	www.weather-photography.com /album.php?cat=clouds&subcat=shelf_cloud (125 words)

	6/25/03 Shelf Cloud
		Shelf cloud 4 miles NW of Belmont just about over the top of me at 2 pm..
		As it passed over, very strong winds and heavy sheets of rain followed for about 15 minutes with an estimated speed of 50 to 55 mph top wind gusts.
		The temperature was 88 degrees before the storm and after it passed the temperature dropped to 66 degrees.
	members.tripod.com /spscott_70/id9.html (123 words)

	[No title]
		I watch a spectacular shelf cloud approaching from the west toward my location between Eureka and I-74.
		A bit closer to me, the shelf cloud showed a sharp linear striation where it intersected with the parent cloud.
		I get a little more video of the spectacular, menacing shelf cloud as the storm is about to overrun me again.
	www.siue.edu /~jfarley/chase604.htm (1682 words)

	2000 Chase Images
		An impressive shelf cloud races east ahead of a strong line of storms near Glasgow, MT. The leading edge of the shelf cloud confirms a bow echo pattern that was observed on radar.
		Here is a closer view of the "bow echo" region of the shelf cloud as it punches ahead of the main line of storms.
		This view is looking to the southwest at the approaching shelf cloud connected to a line of storms moving across the eastern plains of Montana.
	www.stormeffects.com /2000_chase_images.htm (1009 words)

	Fremont Nebraska weather links and storm chasing photos page - shelf/wall cloud - 5/9/2001 (Site not responding. Last check: 2007-10-31)
		The first 4 images are of the shelf cloud on the east southeast side of the supercell thunderstorm.
		The next two images are of a curious phenomena within the wall cloud itself.
		Having only seen this cloud formation about 2 times previous, though not this close, I can only hypothesize that this is an area of updraft primed to produce a tornado, which it didn't.
	5starpicks.com /Weather/fremont592001page4.html (125 words)

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