July and August are the happiest months for polish kids when they look into the calendar. With the end of the school year they start the summer vacation. For their guardians it is relax time too – they constantly take time off in their activity cause it is magnificent term to use break in Poland. There is only one unknown – weather.
That mentioned pair of the months are the time, when in Poland happens the highest temperature is deeply warm.

Lightning

Autor: David Prasad
Źródło: http://www.flickr.com
Generally, after week with 30-35 Celsius degrees warm wind close the Earth inosculate with cold wind coming from north. Together it is create colossal, a few days long gale with lightning. The biggest storms in national past times occurred over 80 years ago. First one in July 1928 over capital and neighborhood. That storm leads to gigantic material losses.

There is no summary report but local media informed about 62 victims , over 150 wounded, destroyed houses, telegraph poles and trees. Lightning hits caused over 100 fires of houses. Second huge gale happened in July 1931 near Lublin. Local press inform about wind blowing at a speed of 500 km/h. Current one of the most massive storm occurred betwixt Wrocław and Łódź in 23rd of July 2009 – this two cities are over 200 km away from each other. Storm (called “Derecho”) leads to death of 10 people and 100 injured. In Poland storms with lightning are yearly incident. Highest frequency of storms is in hilly part of country – in areas called Żywiecczyzna, Bieszczady Mountains and Tatra Mountains it happen almost one in ten days. Lowest frequency is in the northern part – 20 days per year.

Other interesting fact are hailstorms. But what have to happen to form that sort of storm? 65 of 68 storms with hail happen when temperature was at least 15 Celsius degrees and atmospheric pressure is roughly 850 hPA. Second cause of frequency of hail is closeness of weather front with equator and polar air masses. How can we be confident that our holiday won’t be confused by gale? Pick late August time or early June, pick another state for a expedition or take a fancy to wintertime rest.