- Details
- Written by: Glenn and Rick
- Category: Alpine: Issues & Activities
- Hits: 52
- Details
- Written by: Glenn and Rick
- Category: Alpine: Issues & Activities
- Hits: 52
- Details
- Written by: Glenn and Rick
- Category: Alpine: Issues & Activities
- Hits: 55
The MeteoSwiss office for the southern Alps sits on a steep hillside north of the centre of Locarno. From the windows of its forecasting room, the curve of the Maggia delta spreads out below: a giant fan of land pushed some 2.5km into the lake. Few rivers in Europe are as sensitive to rainfall as the Maggia, or swell as fast. Months earlier, in September 2023, the waters had surged 17-fold in a matter of hours; it was the kind of deluge the landscape took in its stride. But at lunchtime on that last Saturday in June, the meteorologists were worried. One week earlier, a thunderstorm in their territory had triggered a debris flow that devastated the hamlet of Sorte, Graubünden. Two people were killed; one was still missing. Sorte was uninhabitable. Now, they saw low pressure moving from France to southern Germany, just as hot air pushed northwards from Italy. In spring 2024, the surface temperature of the Mediterranean had been six degrees above its 30-year average, and in recent days, it had set new records for June. When those currents of hot, wet air collided with the massive concave barrier of the Alps, they would either be deflected or converge and climb, creating the conditions for another major storm.
At 13.30, the meteorologists held a video call with police, the fire brigade, the civil protection agency, the transport network and the cantonal experts on hydrology and geology. For the first time in the Ticino canton, they were raising the thunderstorm threat to its highest level: a “severe” hazard, level 4, with risks including flash floods, tree-toppling winds, landslides, giant hailstones and lightning. Radar maps showed heavy rain in the alpine valleys of upper Ticino, and violent thunderstorms in central and southern parts of the canton: Locarno, Bellinzona, Lugano.Warnings went out on local television, radio, social media and the widely used MeteoSwiss app........read on https://www.theguardian.com/