The places where there were top ratings • Peter Kondrup: “At most five degrees higher than normal”
During Friday, very mild air for the season swept over the northernmost parts of the country. In several places in northern Sweden it has been between 10 and 12 degrees, and locally even higher temperatures.
– The first week of November has been considerably milder than usual, especially in parts of northern Sweden. At most, it is around five degrees warmer than normal in the inner parts of Lapland, just east of the mountains, says TV4’s meteorologist Peter Kondrup.
Jokkmokk’s airport recorded 11.8 degrees on Friday, and although measurements have only been taken there since 2000, records have been made in Jokkmokk’s central location since 1860. The old record for the first week of November was 10.8 degrees there.
Why then do we see such high temperatures in Northern Norrland for the time of year? TV4 meteorologist Peter Kondrup explains:
– In connection with the fact that we have a high pressure center over Poland, the warm air from the western Mediterranean has first moved north over Western Europe and then over the Scandinavian mountain chain, where the Föhn effect has helped to raise the temperatures.
In Gällivare, where measurements have been taken since 1897, a temperature of 10.7 degrees was measured during the day – almost a full degree warmer than the previous record of 9.6. Several other measuring stations have also broken their station records for November. Including Naimakka, Karesuando and Pajala.
– Individual heat periods have always occurred, but in connection with global warming this may become more common, says Peter Kondrup about the new record temperatures.
Continued meteorological winter
In Kiruna, a temperature was measured that was 0.3 degrees higher than the previous record, when 10.4 degrees was recorded. However, Friday’s record heat will not last long. During the evening and night it blows up to a storm in the northern Lapland mountains and a cold front slowly but surely makes its way south during the night.
– During Saturday it will generally be 5-10 degrees lower than during Friday. In Kiruna, the temperature can even drop to zero, says Peter Kondrup.
For some time now, it has been meteorological winter in the northern parts of Norrland. A stamp that remains despite the recent mild weather. When the northern parts of the country can be covered in snow again remains to be seen.
– Much of the snow that previously arrived in this part of the country has now quickly melted away and there is currently no forecast for when it will return.
This means the Föhn effect
When moist air blows over a mountain range, the air that descends on the other side of the mountain becomes drier and the temperature then rises more easily. The phenomenon is called the Föhn effect or Föhn wind.
When the air blows up towards the mountain, the air rises, in many cases it contributes to the start of snow or rain on the windward side. If it rains or snows on the windward side, the air reaching over the mountain to the leeward side will be drier. It takes less energy to heat dry air compared to moist air and therefore the temperature will be higher on the leeward side than the windward side.
In Sweden, the Föhn effect is common in the mountain range, of course, but the Southern Swedish highlands also contribute to the Föhn effect. With heat records during both summer and winter, the Föhn effect often has a hand in the game. Westerly winds give the temperature an extra boost east of the mountains and on the coast of Småland. In the case of easterly winds in the south, which are not all too common, the Föhn effect can contribute to slightly extra high temperatures on the West Coast.
Source: Klart.se