As we fall back into our normal September routines, summer is going to go out with a bang. It almost makes me want to get up and dance to this. In fact, since that Earth, Wind & Fire song was released in 1978 Vancouver International Airport (YVR) has never recorded a temperature above 30°C in September. The warmest September day on record at YVR fell on September 3rd, 1988, where 29.3°C was recorded.
A thermal trough is moving in from the southwest and if it moves far enough north, Vancouver could be in for some very toasty warm days, with above average Humidex values as well. Daily temperature records will likely fall. This type of blocking pattern is quite common during the summer months in Vancouver, as the stagnant, repeating pattern normally allows for accurate forecasts for several days in advance.
Currently models are showing the warmest afternoon likely falling on Wednesday and here's what several models are forecasting for Wednesday afternoon (5pm).
Look up at the sky next time it's clear and sunny. You'll see something that you've probably never noticed before.
Focus on the blue, and suddenly you should see many white specks flying around near the center of your field of vision! These are called 'blue-sky sprites' and it's been coined the blue field entopic phenomenon.
Believe it or not, you're seeing your own white blood cells moving though your retina. Blue light is absorbed by the red blood cells and your brain edits this out and fills it in, but white cells are much more rare. They fail to absorb the blue light, creating gaps in the blood columns.
If you want to read more about this effect, check out the Wikipedia page.