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What triggered deadly floods in Spain? The effect of DANA explained

Catastrophic flash floods that have eliminated at least 217 individuals in Spain are caused by a harmful weather system in which cold and warm air meet and produce effective rain clouds, a. pattern believed to be growing more regular due to environment. modification.

The phenomenon is understood in your area as DANA, a Spanish acronym. for high-altitude separated depression, and unlike typical storms. or squalls it can form separately of polar or subtropical jet. streams.

When cold air blows over warm Mediterranean waters it triggers. hotter air to increase quickly and form thick, water-laden clouds. that can remain over the very same area for lots of hours, raising their. damaging capacity. The event in some cases provokes big hail. storms and tornadoes as seen last week, meteorologists state.

The episode that hit the location of Valencia was the deadliest. in modern Spanish history and the most devastating. flood-related occasion in Europe given that 1967.

Eastern and Southern Spain are particularly prone to. the phenomenon due to its position in between the Atlantic Ocean. and the Mediterranean Sea. Warm, damp air masses and cold. fronts satisfy in a region where mountains favour the development of. storm clouds and rainfall.

Recently's DANA was among the 3 most intense such. storms tape-recorded this century in the Valencia area, said Ruben. del Campo, representative for the nationwide weather condition agency Aemet.

Projections were in line with what took place. But in an area. between Utiel and Chiva, in the province of Valencia, rainfall. gone beyond 300 litres per square metre. In that location, storm. systems formed and regenerated constantly, he explained.

Meteorologists said a year's worth of rain had actually fallen in. 8 hours in parts of Valencia on Oct. 29. The facilities. to evacuate a lot water in a location that is typically dry to. the point it counts on sea water desalination for part of its. fresh water intake.

Effective flood caution systems typically help to prevent the. level of destruction and the number of deaths throughout such. occasions, the World Meteorological Organization stated.

' FINGER PRINTS OF CLIMATE CHANGE'

While experts say it will take time to evaluate all the information. to figure out if this specific DANA was triggered by climate. modification, the majority of concur that an increase in temperature of the. Mediterranean and warmer and more damp atmospheric conditions. contribute to producing more regular extreme episodes.

We're visiting more of these flash floods in the. future. This has the fingerprints of environment change on it, these. extremely heavy rainfalls, and these devastating floods, said. Hannah Cloke, professor of hydrology at the University of. Reading.

She stated even early cautions of heavy rain based on dependable. projections did little to prevent the casualties and people required. to comprehend the genuine risk.

Just telling individuals that it's going to rain quite a lot,. it's unsatisfactory ... We could see that individuals were putting. themselves at threat driving in floodwaters, and there was so. much water that it has overwhelmed these places.

Before the term DANA was coined in the early 2000s, any. heavy rainfall in the autumn, characteristic of the. Mediterranean environment, utilized to go by the popular name gota. fria (cold drop) in Spain and parts of France. The term is. still widely used colloquially.

Its origin go back to 1886 when German researchers. presented the idea of kaltlufttropfen, or cold air drop, to. describe high elevation disruption but without obvious. reflection on the surface area. Aemet states the idea of cold drop is obsoleted and defines DANA. as a closed high-altitude depression that has ended up being isolated. and separated from an associated jet stream. Aemet states DANAs. sometimes end up being fixed and even move in reverse, from east to. west.

(source: Reuters)