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Post by Babu on Sept 16, 2020 2:05:48 GMT -5
Wut. After a very stable and rather average September, southern Sweden suddenly got a two day heat spike and Växjö recorded 28.6'C yesterday, beating the old record of 27.6'C by a whole degree. Second warmest was Lund with 27.6'C. Their old record was also 27.6'C, at least since 1901.
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Post by Crunch41 on Sept 16, 2020 20:50:38 GMT -5
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Post by Yahya Sinwar on Sept 16, 2020 21:10:53 GMT -5
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Post by kronan on Sept 24, 2020 9:29:40 GMT -5
I'd never thought of this as a source for faulty temperature measurements before.
In Växjö, an interesting story occurred a few weeks ago. September 15 this year was undeniably a very hot day for the season. In Växjö, the reported temperature jumped up to 28.6 °, which would mean a new September record for the very long measurement series in Växjö.
We have for some time thought that the AWS-station in Växjö has given some noisy values. On this day, however, the temperature jumped more than usual, which we could see with the help of minute data from the station.
If we discover something strange, it is important to quickly investigate the matter further. We then received a probable explanation from the on-site supervisory staff. Some cows had forced the wooden fence around the station and examined the station's equipment too closely!
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Post by Babu on Sept 25, 2020 5:12:18 GMT -5
I'd never thought of this as a source for faulty temperature measurements before.
In Växjö, an interesting story occurred a few weeks ago. September 15 this year was undeniably a very hot day for the season. In Växjö, the reported temperature jumped up to 28.6 °, which would mean a new September record for the very long measurement series in Växjö.
We have for some time thought that the AWS-station in Växjö has given some noisy values. On this day, however, the temperature jumped more than usual, which we could see with the help of minute data from the station.
If we discover something strange, it is important to quickly investigate the matter further. We then received a probable explanation from the on-site supervisory staff. Some cows had forced the wooden fence around the station and examined the station's equipment too closely!
Yeah I know haha, I read that a few hours ago. Cows sniffing the thermometer invalidated the record. Unfortunate that the cows decided to sniff the thermometer on the possibly warmest September day in history. Many other stations in the region recorded close to record breaking temperatures that day. |
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Post by Babu on Sept 25, 2020 5:27:55 GMT -5
An interesting note about the 15th of September when many stations recorded one of their hottest september temperatures of all time, is that a lot of these stations recorded smoke. Whether this smoke was from the forest fires in PNW or if they were from the forest fires in Germany, they may have subdued the temperatures. Looking at satellite images of that day, the smoke cover doesn't look that thick. Nor does it really look like smoke tbh, looks like normal veil clouds and haze during hot summer days, but still. Had there been no smoke that day, temperatures might've been even higher.  |
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Post by jgtheone on Sept 25, 2020 21:39:15 GMT -5
Fun fact: The coldest temperature so far this month was recorded yesterday afternoon.
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Post by Ethereal on Sept 26, 2020 5:46:05 GMT -5
Australia yesterday:   |
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Post by Babu on Sept 28, 2020 7:00:08 GMT -5
Northern Öland in SE Sweden has had a very interesting temperature gradient this year.  Basically a standard European Cfb climate but with immense seasonal lag with March colder than January, August by far the warmest month, and September 5'C warmer than May and possibly even October warmer than May. |
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Post by Deleted on Sept 28, 2020 7:03:52 GMT -5
^ To me, it's weird to think of somewhere in Sweden seeing -1.6'C as the lowest temperature for the year, considering the stereotype of the Nordic countries always being really cold.
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Post by Babu on Sept 28, 2020 7:52:36 GMT -5
^ To me, it's weird to think of somewhere in Sweden seeing -1.6'C as the lowest temperature for the year, considering the stereotype of the Nordic countries always being really cold. This has been a very anomalous year though. |
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Post by Crunch41 on Oct 5, 2020 16:16:49 GMT -5
I can't imagine having a year only get to -1.6 and three months of constant single digits.
With such a mild record low, could you grow a palm there? At least with the 2020 temps?
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Post by Babu on Oct 6, 2020 2:36:12 GMT -5
I can't imagine having a year only get to -1.6 and three months of constant single digits. With such a mild record low, could you grow a palm there? At least with the 2020 temps? Of course. Palm trees can be grown in the mildest parts of Sweden. There are a few older palm trees in Copenhagen's botanical garden. I think they've been grown as far north as Bergen in Norway. I don't think this particular place in Sweden can grow palm trees though, because it's all the way up at 57°N, so they'd probably only survive for a few years until a really cold winter came. Edit: Apparently the main problem in those milder parts is wind and too much water |
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Post by kronan on Oct 6, 2020 10:16:02 GMT -5
Kebnekaise's southern summit is still lower than the northern summit. www.gp.se/nyheter/sverige/kebnekaises-nordtopp-h%C3%B6gst-i-%C3%A5r-igen-1.35119510It has slowly but surely lost its height, the southern peak of Kebnekaise. For a long time it was Sweden's highest point, but for the second year it does not reach over the northern peak, shows the official measurement made on 17 September. The height of the southern peak was then set at 2,096 meters - 0.8 meters lower than the northern peak.
The southern peak is a glacier that is slowly shrinking in the warmer climate, while the northern peak consists of mountains.
"Over the past 25 years, Sydtoppen has lost an average of 1 meter per year," says Gunhild Rosqvist, professor of geography at Stockholm University, in a press release.
Last year, there was a difference of 1.2 meters between the two peaks. That the difference became smaller this year can be explained by the fact that the winter was long and snowy and that the summer was not very hot, which meant that all the winter snow did not have time to melt away.
The measurement of the southern peak has been made annually since the 1940s and is performed by researchers at the Tarfala research station in the Kebnekaise mountains. The station is connected to Stockholm University. |
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Post by Cadeau on Oct 8, 2020 7:43:06 GMT -5
Subtropique indice in the capital of Finland got insane during the past full-year lengthy period. Ariete |
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Post by kronan on Oct 8, 2020 14:05:31 GMT -5
 Hadn't really appreciated how dry stockholm is compared to Göteborg. Only 2 out of the last 18 years has Göteborgs annual precipiation been below 801mm, which is stockholms highest annual precipiation since 1901. And the difference in annual precip has only grown in the last decades. Averages 2002-2019 Göteborg: 945mm (1961-1990 average, 758mm) Stockholm: 541mm (1961-1990 average, 539mm) |
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Post by Babu on Oct 9, 2020 1:56:52 GMT -5
Hadn't really appreciated how dry stockholm is compared to Göteborg. Only 2 out of the last 18 years has Göteborgs annual precipiation been below 801mm, which is stockholms highest annual precipiation since 1901. And the difference in annual precip has only grown in the last decades. Averages 2002-2019 Göteborg: 945mm (1961-1990 average, 758mm) Stockholm: 541mm (1961-1990 average, 539mm) That's actually an interesting pattern I haven't noticed or thought of. Yeah, the baltic sea proper is having very frequent droughts nowadays, and often has below average precipitation, but most of the country is seeing increased precipitation. |
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Post by Babu on Oct 9, 2020 4:15:17 GMT -5
I wanted to create my own moving 365 averages. Here's Umeå Airport since its opening 1965. This chart does not account for missing days though, luckily most missing days tend to get filled in my grid data.  We didn't have our warmest 365 day period this year though. This year, we topped out on the 18th of January (end date for the 365 period being 9th of August) with 5.40'C. The warmest 365 day period was centered on 2013-10-29. In fact, from 2013-09-21 to 2015-01-26 the 365 day mean didn't drop below 5.00'C a single time. That's 493 days. And between 2013-08-21 and 2015-07-21 the 365 day average stayed above 4.80'C. I'll do some more for southern Sweden later. |
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Post by Babu on Oct 9, 2020 5:20:41 GMT -5
Here's Lund.  The maxima "this" year was 2019-09-19 (end date 2020-03-19) with 10.60. If we look strictly at center dates within 2020, we had the maximum value of 10.40'C on 2020-02-22 (end date 2020-08-22). This means that both 2019 and 2018 had center dates with warmer 365 day means than 2020 with 10.60'C and 11.07'C respectively. Also 2014 had a higher value of 10.45'C on 2014-05-28 (which was remarkably close to date and temperature to the 1st of July temp of 10.3'C that became the 2014 mean record). The record 365 day average however was a whopping 11.19'C centered on 2006-12-12. I actually made a 2006-2007 weatherbox [SH]-style earlier (the mean used in the weatherbox is the 24h mean whereas the mean in the graphs are SMHI's own way of calculating mean temperatures, hence the 11.3'C annual mean for the Jul 06-Jun 07): I also made a comparison with Umeå airport putting the two graphs in the same figure using Microsoft Paint  At first I thought Lund looked a lot more stable than Umeå airport, but when scaled to the same x and y axis, they look very similar, although Umeå airport is still slightly more unstable. Lund is of course the upper graph and Umeå AP the lower graph.  |
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Post by Babu on Oct 9, 2020 6:02:14 GMT -5
And here's Stockholm:  Unlike Lund and Umeå, Stockholm actually has its warmest last 365 today. I.e, their 365 day mean maxima is centered on the 7th of April exactly half a year ago at 9.40'C (with an upwards trend because the current wave of mild mean temperatures is warmer a lot warmer than this time last year). And unlike Lund, the maxima this year is actually warmer than last year's maxima of 9.35'C on 2019-10-15. The 9.55'C centered on 2018-10-06 has this year beat though. 2006/2007 wins in Stockholm too though, with a maxima of 9.71'C centered on 2006-12-09. I checked into the weird 8.59'C heat spike in 1864 (centered on 1864-12-08), and it was due to January missing, and thus being replaced by July and bits of June & August. As I said, these graphs don't take into account missing data. |
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