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This. Even America uses lower threshold, unconsciously I'm always applying the definition of tropical night is at or warmer than 25°C.
In Japanese Meteorological term there is a word "super tropical night" which the daily low temperature never fallen below 30°C overnight.
30C is far beyond tropical! Maybe the term "ultra tropical" as in "ultraviolet" or "ultrasonic" (ultra = above) is more appropriate...
Even UHI Central Jakarta only register some 26-27C/80F lows on occasions!
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Well even if 25 was used, that would mean that we normally have a tropical night here every day from June 9th-Sept 19th, with our nomal low peaking at 30 from July 8th-19th. But of humid tropical places, the warmest normal lows I've seen have been in Bangkok and Baranquilla, Colombia.
20-21C is the cut-off where you can comfortably enjoy experiencing truly summerish weather at into the late night hours. Used to be limited to just a few hot days in summer here before we entered our warm epoch. Last two summers, "tropical nights" have pretty common from July through September. It was nice to be able to be to swim at 11PM, hang out in shorts and a tee shirt outside at 1AM, etc.
BTW- Can anyone guess which is the only major city in the lower 48 states that has never recorded a tropical night?
20-21C is the cut-off where you can comfortably enjoy experiencing truly summerish weather at into the late night hours. Used to be limited to just a few hot days in summer here before we entered our warm epoch. Last two summers, "tropical nights" have pretty common from July through September. It was nice to be able to be to swim at 11PM, hang out in shorts and a tee shirt outside at 1AM, etc.
BTW- Can anyone guess which is the only major city in the lower 48 states that has never recorded a tropical night?
I would say it's San Francisco.
But look at this, Helsinki UHI in 2014 is quite a mindf**k:
16 Tropical nights our of 25 at 60N, with 64F being the lowest recorded.
yes, San Francisco it is.
BTW- your potential to get tropical nights is rather impressive for the latitude? Is it usually with a very tight diurnal range (high of 24C followed by a low of 21C) during the summer solstice? Or do you get them with truly hot days above 30C?
BTW- your potential to get tropical nights is rather impressive for the latitude? Is it usually with a very tight diurnal range (high of 24C followed by a low of 21C) during the summer solstice? Or do you get them with truly hot days above 30C?
As the Baltic Sea is very shallow, it warms up quickly, and the coastal regions can clock impressive nighttime temps during warm spells. Ok, that is an UHI location, but still.
And of course it matters that the night is only 6-7 hours long. Also, Finland is behind the Scandinavian mountains, so we won't never be at the front line when air masses comes from the west. From the East we are the first ones, both in summer and winter.
Some summers have 0 tropical nights, another one might have 10-15 on one station. Who knows?
I hope this summer we'll get a massive amount of them.
We don't use that term in casual conversation. I've seen it here defined as a night at or above 20c, so I assumed that was the universal standard.
Quote:
Originally Posted by nei
Not an American weather service term, only heard of it from this forum
Quote:
Originally Posted by alex985
Ditto.
Though if I were to have my own threshold, it would probably be about 24 C (75 F).
Yeah, I didn't get the question, had to read some posts. lol. It's really only a personal definition.
We don't get many nights that stay above 70 here but it does happen. I chose 70-72F but ummm, wouldn't Humidity and Dewpoint be a part of being "tropical"???
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