OFFICIAL: 2021 Weather and Road Conditions MEGA THREAD

[ExtraSlow]

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I'm not dead

[haggis88]

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People who don't have respiratory issues don't get how much it sucks below -10 for breathing. Need to wear a face covering to not have issues

I feel ya, although i don't usually get issues until its about -20 unless I'm really exerting myself

[mr2mike]

Appears people in my area use a car starter and warm up for 20+ min as soon as it hits -5
I bet they don't even notice a mpg difference.

[2Legit2Quit]

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Appears people in my area use a car starter and warm up for 20+ min as soon as it hits -5
I bet they don't even notice a mpg difference.

Are they not aware we're in a climate emergency??? All that idling is going to compound the amount of emergency we're in!!

[ercchry]

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Need to keep focused on the true enemy, wind. It’s actually quite nice out at -30 with dead calm air.

Like summer, but different

[killramos]

You know. There are lots of things to do in life that are actually fun right?

Sitting on a couch comes to mind.

[Darell_n]

I’m sitting at -6000 ft density altitude. Who wants to come drag race me? Only rwd open diffs allowed.

[Sentry]

I have a welded diff AWD studded tire car, ain't about that slippery life. Especially when its minus 30 and the roads all glaze over.

[90_Shelby]

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I’m sitting at -6000 ft density altitude. Who wants to come drag race me? Only rwd open diffs allowed.

Crazy, I just checked Springbank airport and DA’s were -1470ft at 4:00am. If I thought I could hook up with the Trackhawk, I’d go and do some dragy hits!

[rage2]

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Crazy, I just checked Springbank airport and DA’s were -1470ft at 4:00am. If I thought I could hook up with the Trackhawk, I’d go and do some dragy hits!

Air resistance is a bitch at speed in these temps tho.

[Darell_n]

Up to -6184 now. 80 mph would probably tear all the trim off my truck. I wonder how far a stock vehicle could go before leaning out? I guess it can’t really compare to 1 or 2 pounds of boost.

[90_Shelby]

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Air resistance is a bitch at speed in these temps tho.

Density altitude takes into consideration temperature, and we know cars are faster, due to higher hp, with lower DA’s. Should be a non-issue even for a big Jeep with aerodynamics equivalent to a refrigerator.

@Darell_n where are you getting your numbers from? I typically use the numbers from flightaware:

https://flightaware.com/resources/airport/CYBW/weather

[Sentry]

I used to use this when I needed DA measurements for race city or castrol

http://www.dragtimes.com/da-density-...calculator.php

[phubu]

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My hot water tank stopped working last night and actually a beyond post from this time in 2017 saved the day

What was wrong with your hot water tank and how did you fix it?

[Darell_n]

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I used to use this when I needed DA measurements for race city or castrol

http://www.dragtimes.com/da-density-...calculator.php

This is what I use. Their app gives you instant readings for your location based off Weather Underground data. (don’t need to select a track). -6531 right now, but also -38°C. A 13.0 second 1/4 mile time gets corrected to 14.2 under standard conditions, obviously not factoring for zero traction.

[rage2]

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Density altitude takes into consideration temperature, and we know cars are faster, due to higher hp, with lower DA’s. Should be a non-issue even for a big Jeep with aerodynamics equivalent to a refrigerator.

The colder denser air is a lot higher in resistance. Not sure how much though. I remember testing my SLK32 back in the day, doing 100-200kmh runs at -40C temps, and it wasn't that much faster than summer. I expected a lot more. And of course watching how much hp it needs to maintain speed on the highway this week in -30C weather, it's like 15% more. So I figure air resistance is much worse as temps plummet.

Was wondering if anyone has done that side of the calculations.

[ExtraSlow]

I THINK from reading a few things that most air density calculations for automotive performance are really all about ENGINE performance and engine output, and don't really take increased drag into account. Matters a lot at extra-legal highways speeds.

[rage2]

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I THINK from reading a few things that most air density calculations for automotive performance are really all about ENGINE performance and engine output, and don't really take increased drag into account. Matters a lot at extra-legal highways speeds.

It 100% doesn't factor in air resistance. There's no way to calculate it properly against all sorts of different cars with different coefficient of drag.

Like I said, my question is, how big of a factor is it? I'm sure the Tesla folks can probably give a better idea as they monitor wh/km religiously, and probably a lot more accurate with less factors involved than with an ICE drivetrain.

[Sentry]

On the flipside of that, I believe in Phoenix AZ if it's too hot they cancel flights because takeoff speeds and required runway lengths get too high in the hot thin air.

[ExtraSlow]

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On the flipside of that, I believe in Phoenix AZ if it's too hot they cancel flights because takeoff speeds and required runway lengths get too high in the hot thin air.

Neat discussion here:
https://www.google.com/amp/s/amp.azc.../amp/827871002