Mountain weather flows;
it is very complicated and depends on time of day, solar heating or katabatic cooling and temperature inversions.
I nearly flew into the Black Forest during winter at max take off weight calculated using the ground meteorological conditions which did not reflect the air mass at 1,000ft including a 25 knot wind shear. My limited experience mountain soaring in the french alps including the wind direction reversal as solar heating in the higher mountains draws the air in along the river valleys.
I’ve flown paragliders in the lower levels of the chartreuse when the winds at the mountain tops would be fatal - local knowledge.
I’ve also quite often flown circling approaches without any previous specific training with the final approach in a valley and getting stabilised around 30 seconds before landing in a commercial airliner and 5 seconds before touch down in a tug.
Except for possible ice accretion and accepting there were no CBs in the area I would be very surprised if wx was the problem.