0,3

The indices of this sequence, Beaufort Numbers 0 through 12, originally (in 1805) represented different categories of wind force and their effects on a "well-conditioned man-of-war" (Admiral Beaufort's type of ship). Only later were specific ranges of wind speeds attached to the force numbers. The World Meteorological Organization has associated a brief descriptive name to each Beaufort Number (see NWS link); for example, 0=Calm, 8=Gale, 10=Storm, 12=Hurricane. The Met Office link indicates that this scale was extended in 1944 to Beaufort Number 17 and 118 knots; 13 through 17 are only intended to be used for special circumstances such as tropical cyclones. The extension limits the definition of Force 12 to no more than 71 knots. (Most sources I've seen list only Beaufort Numbers 0 through 12 so I'm attaching keyword "full" here.)

Met Office, The Beaufort Scale.

National Weather Service - Chicago, The Beaufort Wind Scale (or who put wind speeds in the Admiral's force scale?).

R. Rowlett, Beaufort Scales (Wind Speed).

a(8) = 34 because Beaufort Number 8 (Wind Force 8 of the Beaufort Scale, a gale) corresponds to 34 knots up to a(9)-1 = 40 knots of wind speed.

Cf. A097404 (same, in statute mph).

Sequence in context: A134869 A020683 A038835 this_sequence A126618 A049648 A133257

Adjacent sequences: A097400 A097401 A097402 this_sequence A097404 A097405 A097406

fini,full,nonn

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Aug 14 2004