You should always keep your eye on the weather conditions.
Lou wakes up one day in March and notices that it is very warm outside.
Lou wants to enjoy the unseasonably nice weather.
Lou checks the weather and sees that winter like conditions will arrive in the next few hours.
Lou decides on a whim to drive a couple of hours out to a state park in order to hike and have a picnic.
Lou goes for a short walk in a park near his hom and is back home before the storm comes in.
A sudden temperature drop followed by a snow comes in by early afternoon leaving Lou stranded in a rural area during a blizzard.