Wybrane przypadki obfitych opadów śniegu w Poznaniu
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Date
2014
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Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk
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Abstract
Composite maps of the sea level pressure and 500 hPa geopotential heights means and anomalies
were constructed for the days with the high snow accumulation in Poznań. Similar maps of the air temperature
at the isobaric level 850 hPa and of precipitable water content were presented. Additionally, 48-hours back
trajectories of air masses for chosen days with the most effective snowfalls were constructed, using the NOAA
HYSPLIT model. Negative anomalies of sea level pressure and 500 hPa heights, which mean low pressure systems
spreading over Europe, are the basic condition of abundant snowfalls in Poznań. Snowfalls may appear as
a result of fronts in the colder parts of Mediterranean cyclones with the dynamic warm and humid air of distant
southern origin climbing upwards on the cooler and more stabile polar air masses from the north or east. The
alternative location of snow-bringing low pressure systems is the Baltic Sea region.
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Keywords
snowfalls in Poland, air circulation, synoptic conditions, back trajectories
Citation
Badania Fizjograficzne, Seria A, Tom 65, 2014, s. 23-37