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Post by greysrigging on Nov 2, 2022 2:26:56 GMT -5
How do y'all feel about the 'feels like' and 'apparent' temps that pop up on forecasts nowadays "? The AU BoM does it....we ( or at least me ) thinks its a sorcery/witchcraft. Now I concede that wind chill is a thing... I was up in the Blue Mountains west of Sydney in Oct 2010 chasing a polar outbreak/snow event that year....Ic at dawn at Katoomba and the wind blowing hard at 60klm an hour....fuck it was cold !! lol Here are some Australian 'feels like' temps at 9.00am this morning in the Australian Capital Cities.  9.00am screen temps, dp's and humidity Darwin - 31.0c, 25.6c dp, 73% Brisbane - 19.9c, 3,2c dp, 33% Sydney - 14.0c, 2.0c dp, 33% Canberra - 7.7c, 0.9c dp, 62% Melbourne - 8.0c, 4.7c dp, 65% Hobart - 10.6c, 1.7c dp, 54% Adelaide - 13.0c, 4.7c dp, 57% Perth - 19.8c, 11.6c dp, 59% Darwin Airport this morning at 4.00am before dawn  Darwin Airport and an inland rural region 40klm south at 1.00pm  Its been explained to me before how you US blokes work out the 'Apparent' temps.... could you do it again by any chance ? In any case, is it a real thing or a construct with no real basis in fact ? |
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Post by Ethereal on Nov 2, 2022 4:50:59 GMT -5
I think it's legit, but on a personal basis (not on the grounds of fact) -- A dry, windy 14C does feel a lot cooler than a damp, foggy 14C. So, a windy 14C will always feel like around 8C.
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Post by firebird1988 on Nov 2, 2022 6:17:11 GMT -5
I have a thread on the climate battles page, where I described a heat index formula that is very close to the one NWS uses, applicable to air temps 75°F+/23.9°C+
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Post by firebird1988 on Nov 2, 2022 6:18:52 GMT -5
I have a thread on the climate battles page, where I described a heat index formula that is very close to the one NWS uses, applicable to air temps 75°F+/23.9°C+ Compare 29°C/4°C dp and 29°C/25°C dp The 4°C dewpoint gives a heat index of 26.5°C The 25°C dewpoint gives a heat index of 34.5°C |
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Post by firebird1988 on Nov 2, 2022 6:21:20 GMT -5
For wind chill, applicable to air temps +9.4°C and lower/49°F and lower, subtract 2/3 of the wind speed (in mph) from the °F air temp, and subtract 0.2°F for every °F the air temp is below 49°F
So 45°F with a 20 mph wind would be a 31°F wind chill/7°C with a 42 kph wind would be a -0.5°C wind chill
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Post by massiveshibe on Nov 2, 2022 6:24:47 GMT -5
I’ve seen 30C in Santiago and 30C in Buenos Aires.
30C in Buenos Aires felt like a steam bath, while 30C in Santiago felt ok.
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Post by AJ1013 on Nov 2, 2022 6:28:32 GMT -5
Heat index and wind chill are legit. The aussie “apparent temp” (30C with a -5C dew and windy does not feel like 16C) and the Canadian humidex (25C with a 20C dew does not feel like 32C) are bullshit.
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Post by Cheeseman on Nov 2, 2022 7:50:31 GMT -5
It's all bullshit. Don't dumb down the weather forecast by trying to freak me out that it "feels like 97!!!!" outside on a perfectly ordinary summer day. Give me the temperature, dew point, and wind speed, and let me make my own decisions as to whether that's "mild and pleasant" or "ZOMG heat stroke imminent".
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Post by Speagles84 on Nov 2, 2022 8:38:03 GMT -5
Heat index and wind chill are legit. The aussie “apparent temp” (30C with a -5C dew and windy does not feel like 16C) and the Canadian humidex (25C with a 20C dew does not feel like 32C) are bullshit. Agreed. Humidex is humiboteving |
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Post by St. Middleway on Nov 2, 2022 10:07:34 GMT -5
Wind chill is sure as hell real unless you got insulation foam inside of your skull.
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Post by Bear on Nov 2, 2022 11:33:04 GMT -5
Windchill definitely packs a punch during winter.
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lancerman
Senior Member
Posts: 44
Location: Etobicoke ON, Canada
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Post by lancerman on Nov 2, 2022 15:38:20 GMT -5
Complete BS, as in, they shouldn't have maps based on meaningless metrics like that.
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Post by Metsfan257 on Nov 2, 2022 16:13:25 GMT -5
Heat index and wind chill are legit. The aussie “apparent temp” (30C with a -5C dew and windy does not feel like 16C) and the Canadian humidex (25C with a 20C dew does not feel like 32C) are bullshit. Agreed. Humidex is humiboteving Strewth, the humidex is an abomination of a system designed to boost record highs in Canada's humid eastern locations. Also Accuweather's RealFeel is not much better.
NWS feels like and wind chill are decent at describing the "apparent temperature". However, they don't factor in the humidity once temps drop below 70F or 75F iirc. This is a mistake because humidity is always going to make a given temperature feel warmer. Humid 90F feels warmer than dry 90F, and likewise (but NWS forgets this) humid 40F feels warmer than dry 40F. One of the many reasons that dry cold is far more uncomfortable than humid cold is that dry cold feels much colder.
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lancerman
Senior Member
Posts: 44
Location: Etobicoke ON, Canada
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Post by lancerman on Nov 2, 2022 16:16:34 GMT -5
Strewth, the humidex is an abomination of a system designed to boost record highs in Canada's humid eastern locations. Also Accuweather's RealFeel is not much better.
NWS feels like and wind chill are decent at describing the "apparent temperature". However, they don't factor in the humidity once temps drop below 70F or 75F iirc. This is a mistake because humidity is always going to make a given temperature feel warmer. Humid 90F feels warmer than dry 90F, and likewise (but NWS forgets this) humid 40F feels warmer than dry 40F. One of the many reasons that dry cold is far more uncomfortable than humid cold is that dry cold feels much colder.
I would have agreed if you said 55 to 60 F, but 40? Wet 40 is more oppressive than dry 40 (if both are windy). |
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Post by Metsfan257 on Nov 2, 2022 16:31:39 GMT -5
Strewth, the humidex is an abomination of a system designed to boost record highs in Canada's humid eastern locations. Also Accuweather's RealFeel is not much better.
NWS feels like and wind chill are decent at describing the "apparent temperature". However, they don't factor in the humidity once temps drop below 70F or 75F iirc. This is a mistake because humidity is always going to make a given temperature feel warmer. Humid 90F feels warmer than dry 90F, and likewise (but NWS forgets this) humid 40F feels warmer than dry 40F. One of the many reasons that dry cold is far more uncomfortable than humid cold is that dry cold feels much colder.
I would have agreed if you said 55 to 60 F, but 40? Wet 40 is more oppressive than dry 40 (if both are windy). Maybe it is for you, but I can't tolerate dry cold. |
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Post by Steelernation on Nov 2, 2022 17:20:17 GMT -5
The NWS versions are valid but also should always be additional info, never reported as the actual temperature to make things seem hotter or colder like “OMG -50 in Chicago”
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Post by Speagles84 on Nov 2, 2022 18:54:11 GMT -5
The NWS versions are valid but also should always be additional info, never reported as the actual temperature to make things seem hotter or colder like “OMG -50 in Chicago” 100% agree |
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Post by greysrigging on Nov 3, 2022 2:44:38 GMT -5
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Post by Benfxmth on Dec 14, 2022 0:41:53 GMT -5
Both the heat index and wind chill are real as they're backed by science, but with the same heat index, humid and dry heat feel completely different. With a similar heat index of 114-115°F, a 95/80°F temp/dewpoint combo feels warm and sticky (as if you're at a beach)...whereas a 120/45°F temp/dewpoint combo would feel hot and a bit hairdryer-like.
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