MESSAGE DE BIENVENUE


mercredi 10 novembre 2010

M2K2 TRAPPES TENDANCES au 101110 à 19Z

2568
C'est parti pour un bon coup de tabac, les radiosondes sont emportées par le JET STREAM qui passe au dessus des iles britaniques mais déborde sur une bonne partie du Nord de la France:


2 knots * voir définitions en bas

5 knots

10 knots

50 knots

exemple :   50 +  50 + 10 + 10 + 5  =   125 knots  qui fait   125 x 1,852 = 231,5 km/h

0   101110 12Z  H6  fait  48.269297   3.410630   VOISINES

1   111110  0Z   H18       47.528232  3.549406  COULANGES SUR YONNE

2   111110  12Z H30       48.156229   4.683891   SUD BAR SUR AUBE

3   121110   0Z  H42       48.046750   5.7514217  LA MARCHE

4   121110  12Z H54       48.343333   5.292035   



Définitions :
1 international knot =
1 nautical mile per hour (by definition),
1.852 kilometres per hour (exactly),
0.514 metres per second,
1.151 miles per hour (approximately).
1,852 m is the length of the internationally-agreed nautical mile.
The U.S. adopted the international definition in 1954, having previously used the U.S. nautical mile (1,853.248 m). The U.K. adopted the international nautical mile definition in 1970,
having previously used the U.K. Admiralty nautical mile (6,080 ft [1,853.184 m]).
The speeds of vessels relative to the fluids in which they travel (boat speeds and air speeds)
are measured in knots. For consistency, the speeds of navigational fluids (tidal streams,
river currents and wind speeds) are also measured in knots. Thus, speed over the ground (SOG)
(Ground speed (GS) in aircraft) and rate of progress towards a distant point
("velocity made good", VMG) are also given in knots.
Conversions between common units of speed




























73 Alain