Addressing the 180....In our school district they rarely cancel school (the only reason is if the school buses can't make it through the snow drifts). If school is cancelled, they have to make it up by taking a vacation day because teachers can't work beyond their contract.
Here we have bad weather days built into the calendar. I've been teaching in my district since 2001. We have only used 3 bad weather days. Two are this year Holy Thursday and Memorial Day.
We did not have to make up days after Rita or Ike. There was so much time lost and it was so wide spread that TEA gave everyone waivers. The same thing happened back when I was in HS 2x within months of each other.
The end of my sophomore year our area of Houston got hit by tornadoes or micro-burst. With some schools having minor damage (My HS was going to have some work done over the summer. Supplies like fiberglass insulation had been delivered and was scattered around the central courtyard by the wind/tornadoes/micro-bursts) and power outages they called school. It was the last full day of school. The next three days were 1/2 days with finals. TEA didn't make us make up the day. The kids were beating down the doors to get our review sheets and books. They ended up each wing's emergency exit so we could come in see our teachers and pick up our books and review sheets.
Then in August Alicia hit. None of our buildings were damaged, and flooding wasn't a problem in district, but the schools didn't have power. Without power the health department shuts you down, because you can't serve lunch - also if the water is out. We were out maybe a week, and school had just started. TEA gave everyone waivers then too.
I remember being sent home numerous times for power outages. If we got to the magic hour where attendance was taken for the state and power was out we went home but the day counted. If the power went out after lunch was served and stayed out for I think 60 min we were sent home. No power = no ac which can be dangerous in buildings built for AC they heat up fast. My elementary was pre-ac building and could be kept at a safe temperature. Still the nurse called mom after power was out for more than 30 min to pick sis and I up. Sis has had heat exhaustion several times and I was usually in massive pain and covered with a rash by then. It was the 70's and polyester does not breathe.