Central Mediterranean sea: a deep low-pressure system is causing snow, rain and strong winds.

The cold air moved towards central Europe the last few days has reached the Mediterranean region, causing the development of a deep low-pressure system (981 hPa) between Spain and Italy (Figure1). This is causing strong winds especially southwest of Sardinia, with gusts up to 100 km/h.

In addition, since yesterday rainfall is observed along the Italian peninsula (especially in Liguria and S Italy); last night and this morning, with the colder air approaching the Mediterranean region, snow has fallen on the plains in N Italy (especially E Romagna and Piemonte), but snow showers have been observed also in Genova on the coast of Liguria.

Moving south, the snow limit increases (between 300-1000 m a.s.l in central Italy and 1000-1500 m a.s.l in the south).

synoptic chart 24/01/2019
Figure1. Synoptic chart of today. Notice the low-pressure system in the central Mediterranean sea. (source: Met Office).

The satellite imagery of today (Figure2) shows clearly the different weather conditions on the Mediterranean region, with the low-pressure system on the Tyrrhenian sea, the colder air entering the Mediterranean region from France and the low clouds in central Europe (where very cold temperatures are still observed).

Satellite imagery Europe 24/01/2019
Figure2. Satellite imagery of Mediterranean region today. I have added the main weather features (polar air, snow at ground and fog/low clouds). Source (Sat24).

Tomorrow the low-pressure system will move eastward towards Greece, though it will start weakening. Thus, winds won’t be as strong as today and the weather conditions should see brighter skies by evening, with some precipitation still possible in Sicily and SE Italy (with snow on the Appennines above 700-1000 m a.s.l. due to the colder air).

Finally, temperatures will decrease mostly everywhere, with negative values tomorrow morning in N Italy (especially in the area with snow on the ground) and close to 0 °C along the coast in Central Italy. In the south possible +8/+10 °C only in extreme S Italy and Sicily. The maximum values will be between +4/+8 °C in the north, +5/+10 °C in central Italy and between +8/+13 °C in the south.

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edof93

I am Edoardo and I am passionate about weather analysis and forecasing. I would like to share my knowledge and to learn more with others (both International and Italian community).

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