Cold fronts are present in the Sargasso Sea this March 6th at 00 h.
A flux of cold air is going down in the middle of these hot seas since USA.
3 days later, March 9th at 6 h, the contact of this cold air with the hot air of the south causes a depression with the appearance of a hot front and a cold front. The dépression is at 998 hPa.
The 9 March at 12 h, it takes shape a little better.
On March 9th, 18 h, she earns another 8 hPa and joins another zone of low pressure. It is rather classical that a rising depression fussione with wastes of other one.
March 10th 00 h: 13hPa less in 6 h. The angle between the hot front and the cold front becomes clear with right angle. At this stage the center of the depression is still at the angle between the hot front and the cold front.
March 10th 6 h. Secondary fronts appear: still traditional. Pressure still fell of 12hPa and go up to the traditional level of 960hPa. It is a powerful tempest consequently.
March 10th, 12 h. Rarer thing in our regions, pressure continues falling: 952hPa. Fronts begin to move away from the centre of depression. Surprisingly, it is the instant when the tempest develops the maximum of its force. And it is practically always like that.
March 11th 00 h. The lowest is attained with 946 hPa. Such a low pressure is rare in the north Atlantic, we meet them more easily in the big south, around the Antarctic. The fronts which fed it are now easily at 1500km of the centre of depression.
March 11th 6 h. More fed, pressure begins to increase...
March 11th, 12 h. Still surprisingly, pressure remains very low, and the rise of pressure is slow. +5 hPa.
March 11th, 18 h. 5 hPa. A vast area of low pressure is now centered on the Iceland. It is also typical.
March 12th 00 h. Another +4 hPa. Fronts are very far, at 2000km. However this tempest know how to resist at his filling. But where comes the energy?
March 12th, 06 h. It is very slowly the end.
March 12th, 12 h. Still 973 hPa. It is going to disappear the next days...