Criteria in Various Countries
Country | Tornado | Minimum hail size | Minimum wind speed | Minimum rainfall rate per hour | Source |
---|---|---|---|---|---|
United States | See Tornado warning | 1 inch (25 mm) | 58 miles per hour (93 km/h) | See Flash flood warning | |
Canada | See Tornado warning | 20 millimetres (0.79 in) | 90 kilometres per hour (56 mph) | 50 millimetres (2.0 in) | |
Australia | All | 20 millimetres (0.79 in) | 90 kilometres per hour (56 mph) | "Conducive to flash flooding" | |
New Zealand | F1 or stronger | 20 millimetres (0.79 in) | 110 kilometres per hour (68 mph) | 25 millimetres (0.98 in) | |
Germany | All | 15 millimetres (0.59 in) | 105 kilometres per hour (65 mph) | 20 millimetres (0.79 in) | |
Mexico | All | 5 millimetres (0.20 in) | 89 kilometres per hour (55 mph) | 20 millimetres (0.79 in) | |
United Kingdom | All | 20 millimetres (0.79 in) | 55 miles per hour (89 km/h) | "Conducive to flash flooding" |
Read more about this topic: Severe Thunderstorm Warning
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