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If Christmas Eve looks grayish, it looks like it will be a really white Christmas day in some places.
SMHI class 1 warns of snowfall in Uppsala County and Stockholm County along the Roslag coast.
– There can be quite heavy snow showers and wind, from what you have to see, it’s hard to say exactly how much will come There can be large amounts of snow locally, says Lasse Rydqvist, Storm’s meteorologist.
It can have a maximum of 10-15 centimeters of fresh snow. According to Storm, the largest amounts probably come from the northern part of Uppsala County.
– But then it is not impossible that it also goes down over the Stockholm area. In fact, I saw yesterday that it could be so.
Risk of “snow cannons”
Snow cannons can be produced causing heavy snowfall.
– It is tomorrow when there is a small risk of snow cannons towards the Uppland coast, says Lasse Rydqvist.
Describe the snow cannon weather phenomenon as follows:
– It is when very cold air descends on ice-free water, so the entire Gulf of Bothnia travels there and warms up. Then quite heavy snow villages form, traveling in a band along the water, and then entering by land. They follow the direction of the wind, so you will march with blizzards there until the wind changes. It becomes like a long band, a snake on the sea, that looks like a snow cannon.
Snowfall definition warning class 1
Snowfall where 5mm or more (in molten form) was expected within 6 hours. At the beginning or end of the season, a warning can be issued even with small amounts of snow. Risk of slipping on roads. If the forecast changes to heavier snowfall of more than 20mm in 12 hours, or 12mm in 12 hours in combination with fresh wind (above 8m / s), the warning is updated to a higher warning class.
