Humid air will produce Congestus in the Alps pretty soon, with spreading the clouds. The southerly airflow above 4000m will drift this spread (clouds) over to Engelberg in the early afternoon. Later we await Congestus and isolated CB.
Prediction of Congestus-free zone around Engelberg:
COSMO1 until 14h
WRF until 13h
AROME until 16h
The prognosis, where, and when the first Congestus is in our area is very difficult. I think, we can fly until 14h :-)
Lite to moderate valley brises.
1500-2500m: No wind.
01 June 2017, Martin Scheel
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