Ancient clam shells reveal Atlantic Ocean currents are becoming dangerously unstable, approaching critical climate tipping point.

The tropical hazard outlook for September, issued by NOAA’s Climate Prediction Center this week, indicates that forecasters expect the warmer waters to increase the chances of tropical activity in the Gulf next week. The second half of hurricane season typically sees more activity in the Caribbean and Gulf than the first half.

An analysis of clam shells suggests the North Atlantic subpolar gyre has had two periods of destabilization over the past 150 years: one around 1920 and the other from 1950 through present.

Priscilla has lost hurricane strength as it churns off Mexico's western Pacific coast ever closer to the Baja California peninsula.

The tropical wave, a broad area of low pressure, is currently several hundred miles south-southwest of the Cabo Verde Islands, according to the National Hurricane Center’s Sunday afternoon update. Due to the system’s distance from land at the moment, it isn’t causing severe weather in the South Florida region.

B UXTON, N.C. (WBTV) - Another house along the Outer Banks collapsed into the Atlantic Ocean near Buxton and Rodanthe, bringing the total number of houses destroyed over the course of four days to nine. Outer Banks houses collapse into Atlantic Ocean as hurricanes churn offshore: See video here

Bivalves, such as clams, oysters and mussels, record seasonal environmental changes in their shells, making them living chronicles of climate history. A new study of bivalve shells has detected two major episodes of instability in the North Atlantic Ocean's circulation systems,