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Astronomy Picture of the Day -- A Roll Cloud Over Uruguay
NASA ^ | June 02, 2013 | (see photo credit)

Posted on 06/02/2013 11:36:42 AM PDT by SunkenCiv

Explanation: What kind of cloud is this? A roll cloud. These rare long clouds may form near advancing cold fronts. In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud. When this happens uniformly along an extended front, a roll cloud may form. Roll clouds may actually have air circulating along the long horizontal axis of the cloud. A roll cloud is not thought to be able to morph into a tornado. Unlike a similar shelf cloud, a roll cloud, a type of Arcus cloud, is completely detached from their parent cumulonimbus cloud. Pictured above, a roll cloud extends far into the distance in 2009 January above Las Olas Beach in Maldonado, Uruguay.

June 02, 2013 , taken 25 January 2009

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; science; uruguay
[Credit & Licence: Daniela Mirner Eberl]

1 posted on 06/02/2013 11:36:42 AM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
Taken on January 25, 2009, Wikipedia License, the big one.

2 posted on 06/02/2013 11:37:07 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

Saw these a few times in New Orleans as fronts came in. Spooky lookin’ for sure.


3 posted on 06/02/2013 11:46:11 AM PDT by rktman (BACKGROUND CHECKS? YOU FIRST mr. president(not that we'd get the truth!))
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To: SunkenCiv

‘Lends a new meaning to the saying- “Looks like a storm’s rolling in.”


4 posted on 06/02/2013 11:50:50 AM PDT by mikrofon (APOD Bump)
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To: SunkenCiv; Caipirabob; Cacique

"QUÉ LA PARIÓ!"

5 posted on 06/02/2013 11:56:57 AM PDT by martin_fierro (< |80~)
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To: SunkenCiv
Looks similar to a derecho.


6 posted on 06/02/2013 12:00:03 PM PDT by COBOL2Java (Fighting Obama without Boehner & McConnell is like going deer hunting without your accordion)
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To: COBOL2Java

Derecho means “right” as in the direction (en espanol)


7 posted on 06/02/2013 12:05:35 PM PDT by editor-surveyor (Freepers: Not as smart as I'd hoped they'd be)
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To: SunkenCiv

8 posted on 06/02/2013 12:08:26 PM PDT by JoeProBono (Mille vocibus imago valet;-{)
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To: editor-surveyor

Maybe they meant “skedaddle RIGHT now”


9 posted on 06/02/2013 12:17:43 PM PDT by X-spurt (Republic of Texas, Come and Take It!)
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To: editor-surveyor

Derecho

A derecho is a widespread, long-lived, straight-line windstorm that is associated with a fast-moving band of severe thunderstorms. Generally, derechos are convection-induced and take on a bow echo form of squall line, forming in an area of wind divergence in the upper levels of the troposphere, within a region of low-level warm air advection and rich low-level moisture. They travel quickly in the direction of movement of their associated storms, similar to an outflow boundary (gust front), except that the wind is sustained and increases in strength behind the front, generally exceeding hurricane-force. A warm-weather phenomenon, derechos occur mostly in summer, especially during June and July in the Northern Hemisphere, within areas of moderately strong instability and moderately strong vertical wind shear. They may occur at any time of the year and occur as frequently at night as during the daylight hours.

Etymology

Derecho comes from the Spanish word in adjective or adverb forms for "straight" (adv, adj. "direct"), in contrast with a tornado which is a "twisted" wind. The word was first used in the American Meteorological Journal in 1888 by Gustavus Detlef Hinrichs in a paper describing the phenomenon and based on a significant derecho event that crossed Iowa on 31 July 1877.
10 posted on 06/02/2013 12:18:46 PM PDT by COBOL2Java (Fighting Obama without Boehner & McConnell is like going deer hunting without your accordion)
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To: SunkenCiv

Gee whiz, we never get clouds like that.


11 posted on 06/02/2013 12:50:46 PM PDT by bigheadfred ( barry your mouth is writing checks your ass cant cash)
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To: editor-surveyor

No, in Spanish re directions, it means straight ahead.


12 posted on 06/02/2013 1:04:20 PM PDT by kabumpo (Kabumpo)
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To: SunkenCiv

Beautiful. Nature’s wonders still beat anything we can put on a television.


13 posted on 06/02/2013 3:03:24 PM PDT by OldNewYork (Biden '13. Impeach now.)
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To: SunkenCiv

We occasionally see those weird, tubular clouds over the ocean on very humid days. When the upper winds start breaking them up, they turn into waterspouts (miniature tornadoes). It’s eerily beautiful the way they twist and dance on the horizon. Fortunately, the hot water closer to the beach breaks them up before they can make landfall and cause damage.


14 posted on 06/02/2013 3:34:17 PM PDT by jespasinthru (Proud member of the Vast Right-Wing Conspiracy.)
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To: rktman; mikrofon; martin_fierro; COBOL2Java; JoeProBono; X-spurt; bigheadfred; kabumpo; ...

Thanks!


15 posted on 06/02/2013 3:53:35 PM PDT by SunkenCiv (McCain would have been worse, if you're a dumb ass.)
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To: kabumpo

No, it is right as in “correct” in the masculine and it is right for direction in the feminine: “a la derecha.”

I had the gender switched.

Straight is recto, and go straight ahead is vaya todo seguido.


16 posted on 06/02/2013 4:48:42 PM PDT by editor-surveyor (Freepers: Not as smart as I'd hoped they'd be)
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To: SunkenCiv

Spooky!


17 posted on 06/02/2013 6:04:07 PM PDT by BenLurkin (This is not a statement of fact. It is either opinion or satire; or both)
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To: editor-surveyor

Yes, you had the gender wrong and no, derecho is also used as ”straight ahead”. Trust me. I speak Spanish, work in NYC with Spanish-speakers, and have been in hundreds of taxis driven by Spanish-only speakers for the past decade.


18 posted on 06/02/2013 6:10:08 PM PDT by kabumpo (Kabumpo)
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To: editor-surveyor

Yes, you had the gender wrong and no, derecho is also used as ”straight ahead”. Trust me. I speak Spanish, work in NYC with Spanish-speakers, and have been in hundreds of taxis driven by Spanish-only speakers for the past decade.


19 posted on 06/02/2013 6:10:08 PM PDT by kabumpo (Kabumpo)
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