1.   How quickly Bonnie turns depends on the strength of a mid-level low pressure trough over the eastern United States.

2.   A broad low pressure trough in the lower levels of the atmosphere is producing a humid southwest flow across the region.

3.   A low pressure trough will move into the Mona Passage from Hispaniola Sunday.

4.   A major low pressure trough to the west of Puerto Rico between Cuba and Haiti is the most significant feature on this mornings weather chart.

5.   A low pressure trough will move westward across the eastern Caribbean and approach the U.S. Virgin Islands late tonight and Puerto Rico on Saturday.

6.   A low pressure trough persists across the northeast Caribbean extending from Hurricane Iris southward to between Puerto Rico and the Virgin Islands.

7.   A low pressure trough was located across the Dominican Republic where it was very cloudy with heavy rain on the north coast.

8.   A pre-frontal low pressure trough precedes the cold front and extends from the Atlantic southwestward to the Dominican Republic.

9.   A low pressure trough at all levels of the atmosphere persists between Puerto Rico and Haiti.

10.   A tropical wave that is now in western Puerto Rico is interacting with an upper level low pressure trough that is in the Mona Passage.