A tropical storm carries sustained winds of 39–73 mph — below hurricane strength — but its slower movement can produce prolonged, damaging rainfall and flooding independent of wind speed.
| Category | Measurement | Typical property impact |
|---|---|---|
| 39–57 mph | Tropical storm | Loose debris, minor roofing and siding damage |
| 58–73 mph | High-end tropical storm | Shingle loss, larger limbs and small trees down |