Early morning temperatures and black ice

YouTube videos, Pickle juice discussion, doping accusations, etc.

Moderator: mfarnham

Post Reply
User avatar
John D
Posts: 1098
Joined: Tue Aug 10, 2010 7:50 pm

Early morning temperatures and black ice

Post by John D » Fri Nov 29, 2019 8:42 am

Check out this morning's temperature record from the weather station at Quadra Elementary:
Quadra school temp.png
Just a reminder that we're getting into that time of year where the coldest temperatures often occur nearly an hour after sunrise (i.e. when we're heading home after coffee). This morning was fine - although quite cold, the dew point was about -6C, so there was no risk of black ice. But definitely something to bear in mind on mornings when the temperature and dew point are both near zero, and especially if the humidity is high.

There's also a handy wind-chill calculator here:
https://www.ec.gc.ca/meteo-weather/mete ... 0F42F92D-1

JD
"Talk - Action = Zero" - Joe Keithley

LouiseF
Posts: 433
Joined: Sat Oct 31, 2015 1:22 pm

Re: Early morning temperatures and black ice

Post by LouiseF » Fri Nov 29, 2019 12:21 pm

That explains why the ride home AFTER coffee was the coldest part of the ride!!!!

User avatar
myboys
Posts: 293
Joined: Sat Apr 27, 2013 7:30 am

Re: Early morning temperatures and black ice

Post by myboys » Sat Nov 30, 2019 3:53 pm

That is very cool John D!

Mary G

Gerry L
Posts: 77
Joined: Thu May 12, 2016 11:31 am

Re: Early morning temperatures and black ice

Post by Gerry L » Mon Dec 02, 2019 8:20 am

I found this article re. frost/ dew formation. Explains why the Selkirk trestle is frosty on the way home from the ride but not the paved Lochside trail.

https://www.weather.gov/source/zhu/ZHU_ ... .htm#FROST

Post Reply