Mild and cloudy.
21st March 2026
Not a lot to say about today. It was misty and cloudy most of the day, but did brighten up slightly in the afternoon. Not many pictures of tops today.
Overnight rain tonight will saturate the snow pack, then cooler temperatures tomorrow will firm it back, with the possibility it could turn quite icy and consequential by the end of the day. There will also be a small amount of fresh snow tomorrow down to around 700 metres, but this wont be significant, and should bond well initially with the wet snowpack.
It’s a bit of a rollercoaster ride looking ahead, Wintery showers then rain to all levels on Tuesday, before it cools right down again through Wednesday, with wintery showers to lower levels. At the bottom is a wee weather insight regards this. (You can tell it was a poor picture day, when I have to resort to Weather science !)
Ruadh-stac Beag summit.
The South East side of the Corbett Meall a Ghiuthais
The North Ridge of Creag Dubh, Beinn Eighe, hiding in the cloud.
Looking up into murky Coire an Laoigh, Beinn Eighe.
North Atlantic Polar front positioning forecast for the next several days. This shows whether the UK may sit in colder air from the Polar Hadley cell, or the warmer air from the mid latitude Hadley cell. The cold lobes of air projecting down from the Pole are called Rossby waves. (See below!) It is certainly forecasting a colder spell on Wednesday.
Rossby waves or Planetary Waves, are inertia waves occurring in fluids that experience the huge planetary rotational forces. They occur in the atmosphere and act on the different air densities, and they also occur in the Oceans. Above is a typical representation of how they create lobes in the Northern hemisphere, usually either 4 or 5 of them, that rotate around the globe, and determine whether the UK sits in the Warm air mass or colder air mass.
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