1.   Significant advances will be Marked by the confirmation of bold conjectures or the falsification of cautious conjectures.

2.   An area of heavy snow showers will mark the advance of this very cold air into the southern Great Lakes and northern Appalachians late Sunday.

3.   A cold front, crossing the Mississippi Valley, marks the advance of frigid air.

4.   A few thundershowers will mark the advance of colder air into central Michigan and Wisconsin.

5.   A few thunderstorms will mark the advance of cooler air into the Ohio Valley.

6.   But the steps announced by Perry marked an advance in U.S. participation in the peacekeeping effort.

7.   Clouds and a few showers will mark the advance of colder air into the Dakotas and Nebraska.

8.   Clouds and scattered showers will mark the advance of cooler air into the Middle Atlantic region.

9.   Showers and thunderstorms will mark the advance of cooler, drier air into Florida.

10.   The approval of such software for distribution to individual citizens of foreign countries, Ms. Yesil said, marks an advance in the prospects for widespread digital commerce.