[babygene]

A millibar is 1/1000 of normal atmospheric pressure, which is 14.7 pounds per square inch absoluate. So 1000 millibar is atmospheric pressure. That means that 1 milibar is equal to .0147 pounds per square inch. 68.02 milibars equals 1 pound per square inch.

They start with 1000 milibars which is atmospheric pressure, so a category 5 hurricane with a 920.08 mb rating would mean the atmospheric pressure, instead of being 14.7 lbs would be 1.16424lbs less, or 13.5 lbs.

[leadpenny]

Now down to 907 millibars.

22 28/1200Z 25.7N/87.7W 160 195 WNW 12 908 Hrricn
23 28/1500Z 26.0N/88.1W 175 200 WNW 12 907 Hrricn