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  1. Risposte
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    Bravo, remarkable values from Campoluzzo! We...

    Bravo, remarkable values from Campoluzzo!

    We were far away from these values on the north side of the Alps: The cold spell at the end of February came with lot of stratus and strong northeasterly...
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    Hi Bruno Very interesting data and analysis,...

    Hi Bruno

    Very interesting data and analysis, thank you for sharing them with us!

    Best regards, Stephan
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    winter is here!

    Hi everybody,

    just a short update: the frost hollows in Northeastern Switzerland are finally in winter-mode: some 50 cm of snow last Sunday and Monday delivered a good basis for the first notable...
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    Dear Bruno, No problem to use the values from...

    Dear Bruno,

    No problem to use the values from the Realtime-Sensor at Hintergräppelen in your list!

    Perhaps a few addtional remarks regarding this sensor and the communication system that is...
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    Dear Bruno 2 of 3 nights with frost is...

    Dear Bruno

    2 of 3 nights with frost is remarkable! At Sämtisersee (lake) as well as in Hintergräppelen (wetlands) we are far away from these values. I assume that Campoluzzo is a very dry frost...
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    Hi everybody! Last weekend I went to collect...

    Hi everybody!

    Last weekend I went to collect data from my logger. Winter has definitely gone: Sämtisersee had it's last frost on May 20 with -0.8 °C and Hintergrappelen on June 9 with -1.4 °C...
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    New data / frost damages at Hintergräppelen

    Dear all

    I visited the two frost hollows in the Alpstein on Ascension Day in order to collect the latest data. In the morning I visited Sämtisersee - a beautyful scenery:
    ...
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    Hi Karel, hi to all Your info is in no way an...

    Hi Karel, hi to all

    Your info is in no way an interruption - thanks for sharing it with us! Seems that the further east, the more impressive the snow cover was... There is not much information...
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    Dear all, Yes, it was really not what one may...

    Dear all,

    Yes, it was really not what one may expected in the second half of April. I had no problems with my hands: after a 45 min ascent from the valley my blood circulation was quite...
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    Dear all I took advantage of the actual cold...

    Dear all

    I took advantage of the actual cold spell and made a short trip to the frost hollow at Hintergräppelen this morning. It was definitely worth the effort, I could enjoy some -21.4 °C...
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    Dear Bruno, dear Giampaolo Sorry for my late...

    Dear Bruno, dear Giampaolo

    Sorry for my late response, I was absent for holiday. The Cryotemp sounds interesting but I see the drawbacks... I didn't found any information about the response time...
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    Dear Giampaolo HOBO dataloggers definitively...

    Dear Giampaolo

    HOBO dataloggers definitively have a good reputation. The shuttle is a clever way to download efficiently data - can you use it also at very low temperatures? On January 6 (this was...
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    Dear Bruno This is also my understanding:...

    Dear Bruno

    This is also my understanding: thermal cameras detect infrared radiation emitted by objects which permit conclusions on the surface (and not the air!) temperature.

    I can imagine that...
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    Dear Bruno Just one short link:...

    Dear Bruno

    Just one short link: http://www.conrad.it/ce/it/product/1497673/Termocamera-Seek-Thermal-CompactPRO-FF-MicroUSB-40-fino-a-330-C-320-x-240-Pixel-15-Hz/?ref=home&rt=home&rb=1 --> I would...
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    Dear Bruno Very interesting! What kind of...

    Dear Bruno

    Very interesting! What kind of monitoring setup did you had in this frost hollow where you monitored the cold air avalanches? Do you also work with thermal imaging cameras or smoke...
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    Dear Giampaolo Don't worry about your English,...

    Dear Giampaolo

    Don't worry about your English, I think I understand you perfectly and my English is far from being perfect!

    Your observation in the frost hollow of Avalina Regnalt is also...
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    Hi Karel! Nice to meet you here ;-) Thx for...

    Hi Karel!

    Nice to meet you here ;-)

    Thx for your flowers - the two frost hollows in the Alpstein performed very well on January 6th and 7th, especially Hintergräppelen is very promising and...
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    Dear Bruno, The Sonne v4.01 from www.helson.at...

    Dear Bruno,

    The Sonne v4.01 from www.helson.at is really helpful, I appreciate the work of the programmer! Unfortunately the export functionality for plots is limited but hey, it is free...
    ...
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    Hi Bruno, thanks for sharing your knowledge...

    Hi Bruno, thanks for sharing your knowledge regarding the high-frequency variations!

    I prepared a short animation with the webcam pics from Lake Sämtis. At the beginning the webcam is partly...
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    Dear Bruno I appreciate your reasoning on the...

    Dear Bruno

    I appreciate your reasoning on the data! Ishare your general conclusions, just a few remarks:

    - Wind was not an issue in the night from January 5thto January 6th, it’s the...
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    Dear all Here is the monthly overview for...

    Dear all

    Here is the monthly overview for Hintergräppelen, updated until January 22:

    https://i2.wp.com/kaltluftseen.ch/wp-content/uploads/HIG_201701_22.png
  22. Risposte
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    Dear all I visited my two stations in the...

    Dear all

    I visited my two stations in the frost hollows in the Alpstein. More details later, just the highlights:

    http://kaltluft.myhostpoint.ch/pics/6_7_jan.png

    -38.2 °C @ Hintergräppelen...
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    Lake Sämtis is indeed a rather special frost...

    Lake Sämtis is indeed a rather special frost hollow. It has a glacial origin and the ground has been sealed with loamy morain material. Just after the last ice age the entire sink hole was filled up...
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    This picture should clarify your question:...

    This picture should clarify your question: http://kaltluft.myhostpoint.ch/pics/saemtisersee-1024x724.jpg
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    Dear Bruno, Lake Sämtis is an entirely closed...

    Dear Bruno, Lake Sämtis is an entirely closed frost hollow, about 70 m deep. Just one quick link: http://www.appenzellerlinks.ch/Appenzellerland/Panoramatour/Kugelpanorama-Alpstein-Saemtisersee.htm...
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