In Ireland (WMO standard) it's more than
10 minutes. This is, apparently ~15%
more stringent, so we've just had a Cat 1/2 hurricane here. (*) it looks like many American meterologists will be looking for a job shortly because Trump plans to abolish the
NOAA - the National Oceanographic and Atmospheric Administration, full as it undoubtedly is of Goddamm pinko commie environmentally concerned types!