Temperature inversion

This season sees some episodes of fog, sometimes lifting at around 10-11am, sometimes staying stubbornly stuck over the area.  Fortunately, we live at the foot of the Jura mountains and can hike up above the clouds which usually peak at 700-800m.

So, yesterday, we walked through town, the Verena gorge, the village of Rüttenen, entered the forest and started our climb. After walking for about 2h30, we reached (gasp) Balmfuechöpfli, a viewpoint where we had a picnic in  the sun. The Alps were clearly visible across the sea of fog.  Next stop was Röti, at 1395m,  on to Weissenstein and back down. 

This weather pattern leads to an inversion of temperatures where it might be 12° at 1200m and 4° at 400m which is below or in the fog. As we reached the cloud at  700m, we had to put our jackets, hats and gloves back on as we entered the cold(er) mist. 

En cette saison, il n’est pas rare que le brouillard s’installe, quelques fois il se lève vers 10-11h – ou reste obstinément toute la journée.. Heureusement, nous habitons au pied du Jura et pouvons monter au-dessus des nuages dont le plafond se situe souvent autour des 700-800m.

Ainsi, hier, nous avons traversé la ville, les gorges de la Verena et le village de Rüttenen avant d’entrer dans la forêt et de commencer notre montée. Au bout de 2h30 de marche, nous avons atteint le point de vue de Balmfluechöpfli (ouf!) et pique-niqué au soleil. Les Alpes étaient très clairement visibles par-dessus la mer de brouillard. Ensuite, nous sommes remontés vers le Röti, à 1395 m, avant d’entamer notre descente via Weissenstein. 

Ce phénomène climatique de plafond de brouillard amène une inversion des températures. Ainsi, les températures sont nettement plus douces (12° à 1200 m) en altitude qu’en plaine (4° à 400 m).  Quand nous avons atteint les 750 m, il nous a fallu remettre nos vestes, bonnets et gants pour nous enfoncer dans le froid humide. 

2 thoughts on “Temperature inversion

  1. What beautiful photos. We’re entering an El Niño with cooler days and much rain. So glad we bought a caravan! S&P

    On Sun, 28 Nov 2021 at 7:37 pm, J and J on the move wrote:

    > John and Jenny posted: ” This season sees some episodes of fog, sometimes > lifting at around 10-11am, sometimes staying stubbornly stuck over the > area. Fortunately, we live at the foot of the Jura mountains and can hike > up above the clouds which usually peak at 700-800m. ” >

    Like

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