These days you're listening to it all year around this time: on TV tell us that time is no possibility of heavy rain and cold drop "cold drop", a term that the scientific community prefers not to use, instead proposed the acronym DANA, which define an isolated depression at high levels. Source
Unlike other depressions, in cases of "cold drop" in surface pressure does not decrease as we approach the center, or too little. In fact, even we can find an anticyclone. To understand how it forms a "cold drop," we must know what happens at an approximate height of 10,000 meters. Many routes run at a similar height, and it is no coincidence, since we know of the existence of a stream of air that can be leveraged to save time and fuel. Is the jet stream, or "Jet Stream." Here we find the origin of the "cold drop." Training
This steady stream of high velocity winds, along with the rotation of the earth, causing ripples in the stream. These ripples are similar to the meandering of a river. Over time, the curve is accentuated causing a stretching of the jet stream which can lead to strangulation and a subsequent isolation. When part of the current is completely isolated from the general circulation of the current, we have a cold or drop DANA.
Unlike other depressions, in cases of "cold drop" in surface pressure does not decrease as we approach the center, or too little. In fact, even we can find an anticyclone. To understand how it forms a "cold drop," we must know what happens at an approximate height of 10,000 meters. Many routes run at a similar height, and it is no coincidence, since we know of the existence of a stream of air that can be leveraged to save time and fuel. Is the jet stream, or "Jet Stream." Here we find the origin of the "cold drop." Training
This steady stream of high velocity winds, along with the rotation of the earth, causing ripples in the stream. These ripples are similar to the meandering of a river. Over time, the curve is accentuated causing a stretching of the jet stream which can lead to strangulation and a subsequent isolation. When part of the current is completely isolated from the general circulation of the current, we have a cold or drop DANA.
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