air mass change, from the warm, humid to the cooler air mass
Yesterday, Sunday, a low pressure system mov from the Gulf of Lion to the Ligurian ! Sea and on Monday, weakening, continu to Eastern Europe. During the night to Monday, the cold front belonging to the low pressure system over Northern ! Europe approach and gradually displac the warm, moist air mass north of the Alps eastwards. Behind it ! less moist and cooler air flow to the northern side of the Alps.
>>>>>Course of the flow situation and the air masses involv from Sunday ! noon (June 9, 2024) to Monday noon (June 10, 2024), shown with the IFS model fields. In the upper row, the 500 hPa geopotential, the equivalent potential temperature ! at 850 hPa (color areas) with the fronts drawn in. In the lower row, the precipitable water in mm (color areas) and the wind field at 700 hPa.
>Course of the flow situation and the air masses involv from Sunday noon (June 9th, 2024) to Monday noon (June 10th, 2024), shown with the model fields of the IFS. In the upper row the 500 hPa geopotential, the equivalent potential temperature at 850 hPa (color areas) with the fronts drawn in. In the lower row the precipitable water in mm (color areas) and the wind field at 700 hPa. (Source: MeteoSwiss/ECMWF)
The thunderstorm phase
The air here was already warm and humid and quite unstable in the run-up to the storm. With the southerly to southwesterly upper air current on the front of the above-mention low-altitude low, additional moist Miterranean air was brought to the Alpine region yesterday. While the first thunderstorm cells form on the southern side of the Alps in the early afternoon, the sun was still shining towards the west and in the Alps, providing an additional “trigger” for convection. Within the next two malaysia mobile database hours, the first thunderstorms also occurr in the Jura and from the Simmen to the Emmental.
>>>>Radar and satellite image with the sunshine duration of the last hour (in minutes) on Sunday 09.06.2024 at 12 and 14 UTC. Source: MeteoSchweiz/MeteoSat
Radar and satellite image with the sunshine duration
of the last hour (in minutes) on Sunday 09.06.2024 at 12 and 14 UTC. Source: MeteoSchweiz/MeteoSat ! (Source: MeteoSchweiz/MeteoSat)
As a result, the showers spread to practically all areas of Switzerland, especially north of the Alps, with local heavy thunderstorms. During the course of the evening, the lightning activity decreas and the showers spread ! out over a wider area. The most intense precipitation fell in parts ! of the Lake Geneva region, the Bernese Seeland, the foothills of the Alps, and in the Will to Thurgau-Schaffhausen area ! with 30 to 50 mm locally and up to 60 mm in the Jura. The snow line was the limits of shar hosting and alternatives above 3000 metres throughout the entire phase, so that practically all of the precipitation was drain away.
Radar and satellite image on Sunday 09.06.2024 at 16.30 and at 18 UTC. Stronger agent email list thunderstorm cells can be seen almost only over the Po Valley at 18 UTC.
Radar and satellite image on Sunday 09.06.2024 at 16:30 and at 18 UTC. Stronger thunderstorm cells can be seen almost exclusively over the Po Valley at 18 UTC. (Source: MeteoSwiss/MeteoSat)
Total precipitation amounts during the thunderstorm phase on June 9, 2024 until 21 UTC.
>Total precipitation amounts during the thunderstorm phase on June 9, 2024 until 21 UTC.
>The cold front phase
The cold front follow from the northwest almost seamlessly on the night of Monday (June 10, 2024) and l to a change in air masses. The associat precipitation was more uniform across the area than in the warm, humid, unstable thunderstorm air. At the leading ge of the cold front, the precing air mass was displac but also mix, which l to quite significant amounts of precipitation. On the ge of the Alpine.