Autumn's first cold snaps bring the season's hazards back before the weather does

The weather itself is not the hazard this month. What people do in response to it is. The first cold nights of the season reliably precede the first heating fires, the first carbon monoxide calls and the first falls on ice, and they do so whether or not a formal advisory is ever posted. Pull your own local forecast office's product at the top of shift; this piece does not substitute for it, and conditions differ by county.

Heating is the pattern to expect first. Furnaces, space heaters, wood stoves and fireplaces come back into use after months idle, often without being serviced. That drives both structure fires and CO calls, and the CO calls climb on the cold, still nights when houses are sealed. Treat an unexplained group of occupants with headache, nausea or syncope in a closed home as CO until a meter says otherwise.

Falls rise with the first frost and the first wet leaves. Overnight lows near freezing put a skin of ice on untreated steps, ramps and bridge decks before daylight burns it off, and that is the window your early EMS runs fall in. The same leaves that hide the ice block storm drains, so the first heavy rain stands water where it did not before — a factor for both flooded-road calls and apparatus routing.

Days are shorter now. Scene lighting that was adequate in September is not, and the end of your afternoon operations window arrives earlier each week.

None of the above is a forecast. It is the pattern that returns every autumn, and it returns ahead of the official warnings that mark the sharper events. Brief your crews on heating fires, CO and ice now, while it is still a drill and not a call. When a specific watch or warning does land for your area, it comes from your local forecast office — read it there, not here.