1.   The computer is programmed with the best available knowledge of how atmospheric conditions cause weather systems.

2.   The weather systems were monumental in extent, whole continents of air rushing madly out of Siberia.

3.   This is due to the duration and movement patterns of the weather systems.

4.   Along the perimeter of this fair weather system, clouds will encroach into the Pacific Northwest and Montana.

5.   And the tempestuous weather system may again bring greater risk of severe tornadoes to Ohio and other states, according to a study by Purdue University researchers.

6.   As a result, weather systems that are normally guided toward the east on speedy jet stream winds have stalled in the sluggish wind flow.

7.   As a result, the weather systems during the lazy days of summer typically move about half as fast of those in the cold season.

8.   As Fossett has learned, it takes not only a fast boat but also a rare convergence of ideal weather systems to have a genuine shot at a record.

9.   As the fair weather system builds into the Northeast Monday night, temperatures will plummet below zero from northern Pennsylvania across the central Hudson Valley to coastal Maine.

10.   At the same time, the weather systems that can draw warm air northward are at their strongest.