11.   A series of disturbances will cause mild, moist air to rise as it encounters a mound of Arctic air centered over eastern Canada.

12.   A sprawling low-pressure zone centered over the southern Gulf of Mexico will be surrounded by bands of heavy thundershowers.

13.   A tranquil but seasonably cool summer day is expected in New England Monday as high pressure, centered over Vermont, moves slowly offshore.

14.   By late morning, mostly sunny skies and will stretch from southern Texas to the Northeast as high pressure centered over Maine continues to influence the area.

15.   Clouds will be slow to break from the Ohio Valley to the Great Lakes and a few showers are still possible near low pressure centered over Michigan.

16.   Farther south, sinking air currents produced by high pressure centered over the interior West will promote ample sunshine from the Great Basin to most of the California coast.

17.   Given the typical spacing between weather systems, a second powerful low pressure system centered over Lake Superior will lash the Middle West on Friday.

18.   High pressure centered over Georgia will promote dry and warmer conditions over the Southeast.

19.   High pressure centered over the Carolinas will circulate the warmer air toward southern New England Friday.

20.   High pressure centered over West Virginia will promote sunshine and near seasonal temperatures from the Carolinas to Maine.