(BIVN) – A High Surf Advisory has been posted until 6 a.m. HST Monday for east facing shores of Hawaiʻi Island, as Post-Tropical Cyclone Barbara makes its approach from the west.

“The combination of cold sea surface temperatures and strong westerly shear has taken a toll on Barbara. The system has degenerated significantly, and it now consists of a vigorous swirl of low clouds devoid of any deep convection. Consequently, it no longer classifies as a tropical cyclone,” the National Hurricane Center said in its final advisory on the storm, posted at 5 a.m. HST. “Additional weakening is indicated, and the system should dissipate in a couple of days while it moves toward the west steered by the low-level trade winds.”

Barbara is 1,040 miles east of Hilo, and moving west at 17 mph. The large, east swell generated by the storm will increase surf along east facing shores of the Big Island to 6 to 10 feet this morning, then building to 8 to 12 feet tonight and Sunday, forecasters say. “We do not currently anticipate surf will reach the High Surf Warning threshold along east facing shores during this event,” the National Weather Service in Honolulu wrote this morning. “However, we will continue to monitor observations in case the surf might be larger than the guidance indicates, especially later this weekend or early next week.”

According to the National Weather Service, forecast models have been consistent in bringing the associated pool of deep moisture over the area from the east. Forecasters wrote: