Thursday, April 7, 2011

Field Trip Post: Number Three

To see a live view of the weather in Roatan, my favorite resort hosts live views of their resort which are updated every 45 seconds and can be viewed here.

Because it is Spring in Roatán, let's simply focus on thunderstorms.

Each thunderstorm has three stages:

Updraft Cumulus Stage

In Photo 1.1, below, you can see the warm air being lifted up v
ertically, which is resulting in large, vertical cumulus cloud formations.

Photo 1.1 - Warm air updrafts, Image Credit: Flickr

Photo 1.2 - Transition from Updraft Cumulus Stage to Mature stage, Image Credit: Flickr

In Photo 1.2, above, warm air has mixed with surrounding seawater, the warm air has risen vertically, which has created cumulus cloud formations.

Mature Stage

In this stage, warm air has risen above the freezing level and co
ndensed. There are strong downdrafts that are pulled down by precipitation. In Photo 2.1, below, moisture has condensed in the clouds on the left part of the picture, and light rainfall is visibly present (shown by the blue arrows).

Photo 2.1 - Light Precipitation and Downdrafts, Image Credit: Flickr

Photo 2.2 - Heavy Rainfall and downdrafts, Image Credit: Flickr

In Photo 2.2, above, moisture has condensed, many downdrafts have been brought down by precipitation and this has produced a heavy rainfall.

Dissipating Stage

The resultant rain has cooled the surrounding air, and air then flows out of the storm - which creates high winds.

Photo 3.1 - Strong Winds, Image Credit: Flickr

In Photo 3.1, above, the rain has decreased in intensity
, the rainfall has cooled the air surrounding the storm, which has caused strong winds, shown by the trees at the bottom of the photo.