Astronomy Picture of the Day

A Roll Cloud Over Missouri

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#83489 by @ 18.01.2006 00:00 - nach oben -
A Roll Cloud Over Missouri

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

Unlike a similar
shelf cloud,
a roll cloud is completely detached from their parent
cumulonimbus cloud.

Pictured above, a roll cloud extends far into the distance in the
summer of 2005 above

Credit & Copyright
#83494 by @ 18.01.2006 07:38 - nach oben -
independence day, doch wo blibt dä will smith?
#83499 by @ 18.01.2006 08:50 - nach oben -
het de falsch chnopf druckt, etz isch sin charre wiss worde und hetten igsperrt. isch gad am flueche und alli andere chnöpf drucke.