Wind, lightning and smoke: prepare site stop and restart decisions
A transit project has a morning lifting plan and a forecast thunderstorm. Smoke conditions are also changing. The superintendent finds one weather note from last summer, with no named monitor, no confirmed shelter and an unexplained wind number copied from a different crane.
Different weather hazards need different decisions. Canadian lightning guidance calls for monitored conditions, suitable shelter and at least thirty minutes after the last thunder before activities resume. Wildfire-smoke guidance calls for task-specific assessment, worker input and reassessment as conditions change. Prepare the arrangements before crews need an immediate answer.
Turn the concern into a workable site routine
- Separate the three decisions. List affected work for wind, lightning and smoke rather than writing one “bad weather” rule. Name who monitors each condition, who has authority to stop affected work and who substitutes when that person is absent. Connect the sheet to the current site arrangements and communicate it to the trades whose work or access will change.
- Have equipment limits checked for the actual operation. Obtain the applicable manufacturer instructions and competent lifting or equipment plan review. Record the precise reference, configuration and task it covers, along with the required monitoring and shutdown arrangements. This article gives no wind-speed limit or crane operating procedure. An unexplained number copied from another machine is a question to resolve before using it.
- Confirm a real lightning shelter plan. Identify suitable shelter, its access and enough time for people to reach it. The Canadian venue guidance describes an enclosed building with plumbing and wiring or a hard-topped vehicle. An unfinished structure is not automatically that shelter. Have responsible people brief the alert and movement arrangements without using a live storm as the first rehearsal.
- Translate smoke information through the assessment. Check current local advisories and the actual tasks, exertion, exposure and affected workers with responsible safety people. Record assessed changes such as relocation or rescheduling, where appropriate. A public index is information for the decision, not an invented universal construction stop threshold. This sheet does not select a respirator, alter ventilation or provide a medical assessment.
- Record stop and restart separately. Log the condition, affected work and instruction actually given. Keep each unresolved hazard visible when another improves. Verify the applicable waiting, equipment and task-review requirements through responsible people before communicating a restart. Clearer skies or a quieter radio do not, by themselves, demonstrate that every affected operation and access route is ready.
Common mistakes
- Copying another machine’s wind number.
- Calling unfinished framing suitable lightning shelter.
- Treating an improving forecast as complete restart approval.
Checklist
Keep the weather decision sheet current
- Separate affected work and decision owners.
- Actual equipment reference and competent review.
- Checked lightning shelter and access.
- Current smoke assessment and advisories.
- Stop status and separate restart requirements.
Check your understanding
The thunder has stopped and the rain is lighter. Can all work restart immediately?
Show the answer
Check the applicable lightning waiting period and each operation’s remaining requirements with the responsible people. Record the actual decision; a change in one condition does not resolve equipment, smoke or access concerns automatically.
