Information about the cold drop (mentioned on the 21st)

clipped from news.softpedia.com The Cold Drop is associated with extremely violent downpours and storms, with speeds of 100-200 km (60-120 mi)/hour The Cold Drop can cause floods over the dry beds of the ancient rivers and torrents. Houses built there can be devastated. If the terrain has no vegetation and there are high slopes and ravines, the water is not absorbed and it can destroy everything in its way. Under some circumstances (like air temperature, winds, humidity, and so on), the Cold Drop can be accelerated. The Cold Drop appears when a front of very cold polar air, called jet stream, advances slowly over Western Europe, at high altitude (normally 5-9 km or 3-5.5 mi). If a sudden cut off in the stream takes place, caused by various motifs, like the effect of the high pressures, a bag of cold air detaches from the main jet stream, penetrating to the south over the Pyrenees Mountains into the Spain’s warm air. What’s the Cold Drop?