1.   A cool front extending southwestward from the low will cross the Great Lakes region, but any further southward advance will be impeded by high-level westerly winds.

2.   In May, a recurrent pattern of blocking high-pressure systems over central Canada have impeded the advance of low-pressure systems from the Pacific.

3.   In turn, this high will impede the advance of a cool front stretching from upper Michigan to the central Gulf Coast.

4.   Some representatives of the several clans that comprise the alliance had complained last week that Taliban armor and artillery impeding their advance had not been hit.

5.   That development, which impedes the advance of democracy, is also one of the most dangerous in the era of globalization, he said.

6.   Those forces have impeded advances over the years by the opposition northern alliance.