Another severe thunderstorm outbreak over Slovakia

A thunderstorm developing in vertical wind shear is quite rare in Bratislava, especially during the summer season. However, this year has brought us many of them, for example on Sunday 27th August. The 12:00 pm UTC Vienna sounding (approximately 60 km from Bratislava to the west) shows moderate CAPE and a very low CIN, despite […]

Bow echo storm system over Slovakia

There were many interesting thunderstorms during this year season in Slovakia but the biggest one hit the western part of the country in the late evening hours on August 10th. The large Mesoscale Convective System (MCS) developed over Slovenia close to the sharp temperature boundary and very quickly moved to the north with the speed above […]

Lake-effect snow

  • February 6th, 2017
  • Weather
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  • Alois Sokol

The most fabulous circulation setup of this winter in the Central Europe was the very cold air outbreak around January 6th. Temperature at 850 hPa level reached -20°C above Poprad aerological station, which is a very rare value within the last 25 years.As the cold air flows to the south over the Baltic Sea, temperature […]

Temperature inversion

  • December 22nd, 2016
  • Weather
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  • Alois Sokol

The most common temperature stratification during winter in the central Europe is an inversion – i.e. temperature of air increases with height. The best way to visualize these situations are vertical cross sections and thermodiagrams. Figure 1 – Vertical change of temperature (solid line) and dew point (dashed line) in Wien on Dec 19th (blue), […]

Vertical wind shear in the tropics

  • December 16th, 2016
  • Weather
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  • Alois Sokol

According to theory, the most typical circulation difference between mid- and tropical latitudes is there is almost no vertical wind shear in the tropics, i.e. there is the same wind speed and direction with the height. However, situation is much more complex in the reality. Nice example of the tropical weather complexity is the Southeast […]

Can polar cap air reach the opposite hemisphere?

There are lot of meteorologic variables and many of them are very advanced, but still, we are able to obtain key information just from a single parameter. If we are familiar with the parameter’s natural background, the only trick is – visualisation 🙂 We choose a dew point today which is – by definition – […]