A '12 mph day' with 28 mph gusts is a gust problem. Work-at-height limits should key on the spikes — here are the numbers trades actually use.
| Work | Caution | Stop |
|---|---|---|
| Ladder work / window cleaning | 12 mph | 20 mph |
| Roofing (sheets, footing) | 15 mph | 25 mph |
| Solar panel handling | 12 mph | 20 mph — panels are sails |
| Tree climbing / rigging | 12 mph | 20 mph |
| Spray applications (paint, pest) | 10 mph | 15 mph — drift and label limits |
| Cranes / lifts | Your equipment manual governs — many cap at 20–28 mph; use the lower of manual vs site plan | |
The hourly view shows sustained wind and gusts separately, every at-height trade score deducts on the thresholds above, and the trade panel shows a plain "stop work when" line so the whole crew knows the trigger before conditions reach it.
General practice: caution above 15 mph, stop above 25 mph sustained — lower when handling sheet goods or on steep pitch. Gusts count: a gusty 18 mph day can be worse than a steady 22.
Falls happen in the spike, not the average — a gust arrives without warning mid-lift or mid-step. Check the gust forecast (CrewCast shows it per hour), not just sustained speed.
Many mobile cranes cap operations around 20–28 mph with lower limits for large sail-area loads — but the manufacturer's load chart and your lift plan are the only numbers that count.
NWS wind advisories and warnings for saved locations arrive as push alerts, and wind is scored into every at-height trade's conditions.