Cumulonimbus and aviation at this altitude, updraughts with speeds that can exceed . Such an updraught speed corresponds to the wind speed of a small hurricane. The speed can even exceed . The maximum number in the Beaufort scale is 12 ("hurricane force" wind) and is assigned to wind speeds of 64 knots or greater. If the Beaufort scale were extended, these updraughts would have a Beaufort number of 14 "in the vertical direction". The turbulence is then "extreme" at this altitude. Moreover, the diameters of the updraught columns vary between 2 km (air mass thunderstorm) and 10 km (supercell thunderstorm). The height
Moratorium on commercial fishing of the Beaufort Sea wrote that Canada had filed a "diplomatic note" with the USA in April when the USA first announced plans for the moratorium. Jack Layton, leader of the New Democratic Party of Canada, called the U.S. moratorium over the disputed waters in the Beaufort Sea as the "largest encroachment on Canadian territory in our history." Moratorium on commercial fishing of the Beaufort Sea On August 20 2009 United States Secretary of Commerce Gary Locke announced a moratorium on fishing the Beaufort Sea north of Alaska. According to Locke: There is no widespread commercial fisheries in those waters now. The moratorium was