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Some clouds are good news messengers and others the warning flags of impending doom. Clouds tell the story AND deliver the goods. There are differences between the messengers and the deliverers that are obvious and will inform the knowledgeable sailor about upcoming weather.

Wind can form around clouds and cloud formation can produce wind. Clouds store enormous amounts of energy. Using evaporation and condensation rates as measuring tools, we can say that a thunderstorm typically uses and generates more than 36 million horsepower (lightning notwithstanding).

Because of the interaction between wind and clouds, a thunderstorm (which typically lasts between 30 and 40 minutes) can trigger more thunderstorms around itself. (An interesting footnote associated with thunderstorms is that lightning does NOT occur IN the rain but AROUND it.)

There are certain types of cloud formations that we can call atmospheric batteries and we all know that batteries can be overcharged, they MUST release energy. Experience tells us that these clouds / batteries take on certain shapes and color when they are ready to release their own overcharge. When this energy is released as wind, rain or both, we call it weather.

In order to keep it simple we're primarily going to discuss cloud shapes and what they're likely to mean to you in the immediate or near future.

Cloud definitions come primarily from their shape and altitude in our atmosphere. Most instructors and meteorologists take that as second nature and try to instruct us by defining shapes and altitude placement using combined words to form groupings. To understand what they're talking about though we need to understand what these combined words mean.

If you remember what these six latin words mean then cloud ID becomes very simple. They are:

ALTO: high in the atmosphere (remember altitude)

STRATUS: evenly layered (remember stratified, layered)

CIRRUS: feathery, wispy, strung out like hair (cirrus even sounds feathery, doesn't it?)

CUMULUS: pillowy, puffy, piling upon itself (remember accumulate)

NIMBUS: containing rain, dark (ebony and nimbus remind me of each other)

Well, there you have it. Combinations of these words will describe any cloud formation such as ALTOSTRATUS: high layered clouds or CUMULONIMBUS: dark, pillowy rainclouds.

In order to place these cloud formations in the atmosphere, meteorologists tell us which kinds of cloud formations are most likely to be seen as LOW CLOUDS, MIDDLE CLOUDS, OR HIGH CLOUDS. There are lots of them but for our discussion we're going to limit ourselves to the most active weather producers.

First comes our good friend the happy-go-lucky cumulus. These guys are loners and are commonly referred to as "fair weather clouds". For the most part, they look like cauliflower, white and fluffy.

It rapidly goes downhill from there, though.

If our friend, the cumulus gets denser, shoots up high in the atmosphere, forms a striated and fibrous top that looks flattened and forms a dark anvil-shaped cloud at its base look out! This is a cumulonimbus. This guy can stream rain and build winds rather quickly or it can start gathering its buddies to build into a full-fledged thunderboomer. This kind of cloud generally is seen during summer and can be the most dynamic of local cloud formations...you can actually see them getting good and mad!

Stratus clouds are relatively low in the atmosphere, uniformly gray and produce drizzle or heavy dew. Stratus is regarded as actually being a high fog. Sometimes rushing warm air can break these formations up or they may "burn off". Other than being gloomy and damp, the worst that this formation offers is to hide the building of cumulonimbus or the passage of a front above it.