Most unusual

I have posted early with a photo taken at 6.00 am this morning from our deck.  The sun has just risen and the city is sparkling. What is unusual is the very straight, but narrow, area of fog heading east to west. We have lived here for 17 years and I have never seen this before. It is a most beautiful and warm summer morning right now, just before 8.00 am. Temperatures are forecast to exceed 30 degrees today.