1.   The centre of pressure moves rearward and the aeroplane becomes unbalanced.

2.   An area of rain will brush southeastern New England as low pressure moves south of Cape Cod.

3.   An autumnal air mass will encompass most of the Middle West and Northeast Tuesday as sprawling high pressure moves southeast from Ontario.

4.   An area of snow will spread rapidly through the Northeast on Friday as low pressure moves north along the Eastern seaboard.

5.   Another bout of wintry weather will affect the Northeast on Friday as low pressure moves north along the Atlantic seaboard.

6.   Areas of showers and rain will cross the Great Lakes on Monday as low pressure moves north into Ontario.

7.   As a jet approaches the speed of sound, he said, the center of pressure moves around, which makes the plane less stable.

8.   A cool rain will fall over most of the Northeast on Tuesday as low pressure moves off the Middle Atlantic coast.

9.   A cool rain will spread east from the southern Appalachians to the Middle Atlantic Coast as low pressure moves east from the Tennessee Valley.

10.   A band of heavy showers and a few strong thunderstorms will sweep off the Northeast coast very early Sunday as potent low pressure moves north through New England.