Tornado Safety Procedures

Tornadoes can develop quickly and leave little time to react. On a construction site, workers may be exposed to flying debris, collapsing temporary structures, overturned equipment, broken glass, downed power lines, and blocked access routes.

This talk focuses on recognizing tornado warnings, knowing where to shelter, stopping exposed work early, and keeping the crew accounted for before returning to the site.

Why This Matters

• Tornado winds can throw plywood, metal panels, insulation, signs, tools, and other loose materials across the site.
• Temporary walls, scaffolds, ladders, formwork, fencing, and unfinished structures may fail under extreme wind.
• Workers in lifts, on roofs, near cranes, or in open areas may not have enough time to reach shelter if they wait too long.
• Mobile offices, trailers, storage containers, and vehicles are not safe tornado shelters.
• After the storm, debris, unstable structures, gas leaks, sharp materials, and energized lines can create new hazards.

Common Hazards

• Crews continuing exterior work after a tornado watch or warning has been issued.
• Workers sheltering in job trailers, vehicles, equipment cabs, under bridges, or beside material stacks.
• Loose materials stored on roofs, upper floors, scaffolds, laydown yards, or near open edges.
• Open-sided buildings, unfinished walls, glass openings, and temporary enclosures exposed to high wind.
• Blocked paths to shelter caused by stacked materials, muddy access roads, locked gates, or equipment routes.
• A tornado forming with little visible funnel because rain, darkness, dust, or nearby buildings block the view.

Safety Checklist

Before Work Begins

• Check the forecast for severe weather, tornado watches, and possible storm timing.
• Identify the safest shelter location, such as a basement, storm shelter, or small interior room on the lowest level of a sturdy building.
• Review the route from each work area to shelter and keep those paths clear.
• Make sure the crew knows the site alert method, such as radio call, horn, alarm, phone alert, or verbal command.
• Secure loose materials, trash, tools, cylinders, ladders, tarps, and temporary signs before storms arrive.
• Assign someone to monitor weather alerts when severe weather is possible.

During Work

• Stop roof work, lift work, crane work, scaffold work, and exterior material handling when severe weather is approaching.
• Move workers out of open areas, upper floors, trailers, vehicles, and equipment cabs when a tornado warning is issued.
• Go to the assigned shelter area and stay away from windows, exterior doors, wide-span rooms, and overhead glass.
• Get low, protect your head and neck, and stay in shelter until the all-clear is given.
• Use radios or phones only if safe and necessary to account for workers and report emergencies.
• Do not leave shelter to check tools, vehicles, materials, or equipment during the warning.

Crew Talking Points

• Where is our tornado shelter area today?
• How will we alert everyone if a tornado warning is issued?
• Which crews are farthest from shelter and need the most time to move?
• What loose materials or temporary setups need to be secured before storms develop?
• Who will account for the crew once we reach the shelter area?
• Speak up if you do not know the shelter route, cannot hear the alert method, or see storm conditions changing fast.

Stop Work If

• A tornado warning is issued for the jobsite area.
• A funnel cloud, rotating cloud, flying debris, or sudden violent wind is seen nearby.
• Weather alerts, sirens, radios, or local officials report tornado danger near the site.
• Workers cannot reach shelter quickly from roofs, lifts, scaffolds, cranes, trenches, or remote work areas.
• Wind begins moving materials, signs, fencing, trash, or temporary structures.
• The foreman, safety lead, general contractor, or local authority orders shelter or evacuation.

Final Reminder

Tornadoes do not leave time for last-minute decisions. Know the shelter location, move early, protect your head, and do not return until the site is checked.