We seem to get a lot of pneumonia fronts lately. Here's yesterday's:
The temperature at IDTWHQ was 23.5°C at 17:35, 22.6°C at 17:45, 20.9°C at 18:00, and down it went, to 15.9°C by 19:00. (For the Philistines, that's a 14°F drop in 90 minutes.) At about that time, smoke from fires in Alberta combined with rapid condensation aloft (i.e., clouds from the cold front) to give us one hell of a filter for the sun:
I used a daylight color temperature (5700K) for that shot so you can see the color I saw.
Here's the NOAA Global Systems Laboratory map from that moment:
Strangely, the air-quality index at WHQ—right now, a super-healthy 15—suggests not a lot of the smoke is getting to the surface. It still seems a bit hazy though. And we're likely to have another beautiful sunset tonight.