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duminică, 3 ianuarie 2010

Mammatus Clouds / Norii Mammatus

Formatiunile respective se numesc Mammatus si se formeaza cand norii sunt saturati cu picaturi de ploaie si/sau cristale de gheata

Mammatus, also known as mammatocumulus, meaning "Mammary cloud" or "Breast cloud" [1][2] is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud. The name "mammatus" is derived from the Latin mamma (udder or breast), due to the clouds' characteristic shape, as some believe there is a resemblance between the shape of these clouds and the breast of a woman.

Desi absolut superbi, este foarte adevarat ca aparitia lor este de rau augur; norii mammatus prevestesc de cele mai multe ori aparitia unei furtuni sau fenomene meteorologice extreme. Sunt compusi in principal din particule de gheata, se extind pe sute de kilometri in orice directie, iar formatiuni individuale pot ramane vizibile static timp de 10-15 minute.

Mammatus may appear as smooth, ragged or lumpy lobes and may be opaque or semitransparent. Because mammatus occur as a grouping of lobes, the way they clump together can vary from an isolated cluster to a field of mamma that spread over hundreds of kilometers to being organized along a line, and may be composed of unequal or similarly-sized lobes.

The individual mammatus lobe average diameters of 1–3 km and lengths on average of 0.5 km. A lobe can last an average of 10 minutes, but a whole cluster of mamma can range from 15 minutes to a few hours. They usually are composed of ice, but also can be a mixture of ice and liquid water or be composed of almost entirely liquid water.







When occurring in tall, dense cumulonimbus clouds – or the anvil cloud stretching from them – mammatus often signal the onset of fierce storms and may warn of tornadoes. Tending to form in warmer months over the Midwest and eastern areas of the US, mammatus are nonetheless found elsewhere, as our chase across the States to track this singular meteorological phenomenon will reveal.





Connecticut

Georgia


Illinois


Iowa


Indiana
Kansas


Kentucky


Maine

Michigan


Missouri


Minnesota

Montana

Nebraska
May_2006_Awesome_Mammatus_Kearny_Nebraska

Nevada
Skies_over_Reno_Nevada_Mammatus_clouds

New Jersey
June_26_2009_Spectacular_Sunset_with_mammatus_clouds_as_seen_from_Hoboken_New_Jersey

New Mexico
rollin_mammatus_clouds_New_Mexico_thunderstorm_touched_up?
New York
you'd_think_a_ufo_was_coming_Mammatus_cloud_over_Manhattan_at_sunset_June_26_2009

Oklahoma
Mammatus_Clouds_in_Tulsa_Oklahoma_USA_June_2_1973

South Carolina
mammatus_clouds_at_sunrise_South_Carolina

South Dakota
Severe_thunderstorms_lightning_and_mammatus_clouds_Rapid_City_South_Dakota
Texas
Mammatus_Clouds_thunderstorm_over_Texas_like_a_brain
Utah
Weird_mammatus_clouds_after_a_thunderstorm_that_drenched_Utah

Washington
New_kind_of_Aliens__really_a_very_rare_cloud_formation_for_the_Washington_area_Mammatus_Clouds
Wisconsin
Wisconsin_thunderstorms_mammatus_clouds


Wyoming
Beneath_Mammatus Clouds_behind_a_passing_storm_cell_Canyon_Village_Wyoming