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Lightning is less frequent in winter, but is much more noticeable than in summer
Date:8/9/2011

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This release is available in Spanish.

Study of lightning rays in the Basque Country, and their relation to precipitation is the title of the PhD thesis that physicist Joseba Areitio presented at the University of the Basque Country (UPV/EHU). In fact, since systems for the detection of these rays of lightning were developed in the 80s, the possibility of estimating the precipitation produced in a storm as a function of the rays generated therein has been an object of research. With this known, it would suffice to know the distribution of rays of lightning in a geographical bowl or river basin in order to estimate the amount of rainfall they receive. Mr Areitio made his contribution to this line of research by gathering data from the Basque Country for which he made use of, amongst other resources, the Aemet (Spanish State Meteorology Agency) lightning ray detection network.

First of all, a study of the geographical distribution of rays in the Basque Country was carried out. Mr Areitio concluded that this is random, with an annual average value of one ray per square kilometre. Nevertheless, there is an exception: in the west of the Basque province of Bizkaia, annual value can be as much as two rays per square kilometre, and concretely in Greater Bilbao, the figure rises to three. This variation may be due to the effect of contaminants in the large urban areas. Moreover, the rays are more intense in the Bay of Biscay watershed (average of 35-40 kiloamperes) than in the Mediterranean one (25 kiloamperes). In any case, it is stressed that, generally, the number of rays and their geographical distribution show interannual and intermonthly variation, resulting from the changes that take place in atmospheric circulation from one year to another.

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Contact: Amaia Portugal
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Elhuyar Fundazioa
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