1.  An approaching front may touch off an afternoon shower in the mountains of New England, however.

2.  An approaching front will bring rain and wind to the Northwest Coast later Thursday.

3.  A corridor of humid air will be lifted by an approaching front in the eastern Great Lakes and St. Lawrence Valley.

4.  A torrid flow from the south will interact with an approaching front to trigger a cluster of heavy thunderstorms in eastern South Dakota.

5.  During the afternoon an approaching front began to stir the lower atmosphere.

6.  Farther west, an approaching front will bring locally heavy rain to Central and Northern California.

7.  Humid air streaming into the Northeast will be lifted by the approaching front triggering thunderstorms in the northern Appalachians.

8.  In the West, an approaching front will send showery rain toward the Washington and Oregon coasts Sunday afternoon.

9.  Later in the day thunderstorms with the approaching front will reach the eastern Great Lakes and Ohio Valley.

10.  Meanwhile, cooler conditions will prevail in central and northern sections where an approaching front will bring a mixture of clouds and sun.