Coastal Flood in Guam, March 1, 2024

High surf generated by long-period north swell, generating high surf estimated to be exceeding 12 feet. This pushed water and debris up to the shelters at the Paseo in Hagatna, and the picnic areas and parking lot at Asan beach. A NWS employee at the Paseo sent photos around 1221ChST showing water ponding of a couple of inches (less than 1/2 foot) around the shelters about 25 to 30 yards from the water's edge. Around 1340ChST, a second NWS employee called from Asan Beach Park located about 3 miles south of the first location, stating significant amount of debris across the parking lot and waves reaching the picnic area. Some of the parking lot are as close about 10 yards from the water's edge during high tide, but most of the picnic area and parking lots are about 20 to 30 yards from the waters edge around high tide. High tide on March 1st occurred around 1038ChST, according to the tide station at Apra Harbor. Predicted height, based off of MLLW, was 2.04 ft, with actual water level measured at 2.66 ft. Tide around the time of the first report at 1221ChST was predicted to be around 1.174 ft and the actual water level recorded was 2.26 ft. Around 1600ChST the office stopped receiving reports of coastal inundation, likely due to the approaching low tide at 1734ChST.