Coastal Flood in Southeast Coastal St. Johns County, Florida

On 10/2 at 6:25 pm, the Mizell Outfall river gauge peaked at 3.04 ft MHHW on the evening of the 2nd. Moderate tidal flooding criteria for this location begins at 3 ft. On 10/3 at 6:25 pm, the tide station at St Augustine Municipal Marina measured 2.03 ft MHHW datum around 6:25 PM. Moderate tidal flooding for this location begins at 1.90 ft MHHW. On 10/3 at 6:49 pm, the tide station at Mizell Outfall on the Matanzas River measured 3.24 ft MHHW datum around 6:49 PM. Moderate Tidal Flooding for this location begins at 3.0 ft MHHW.

An extended duration nor'easter developed on September 30th and continued through October 6th. This event produced an extended period onshore flow combined with a period of high astronomical tides (spring or neap tides). The higher-than-normal tides combined with storm surge with the local nor'easter produced minor to moderate tidal flooding daily around high tides. The more impacted tidal flooding locations included the St. Johns River basin between downtown Jacksonville and Satsuma as well as the Intracoastal Waterway of St. Johns and Flagler counties were several days of moderate tidal flooding occurred in early October. Moderate tidal flood impacts include structures surrounded by tidal flood water and inundation of some roads.