Collectively, the mental calculations involved with figuring out (usually in an early-morning, undercaffeinated state) exactly what time the school bus will be arriving at your house on that day, because the school has a delayed opening or early dismissal that is changing the usual schedule.
The schools in our area have weather-related delayed openings of either 90 minutes or two hours depending on the circumstances. This morning's was a 90 minute delay, the result of the ridiculously frigid temperature outside. Friends of mine with children attending three or more area schools (which are populated by age, and all of which share the same school bus fleet, resulting in staggered bus pickup and dropoff times to begin with) were doubtless spiking their coffee by 8AM.
Is it spring yet??