Hurricane Dorian passed between 80-100 NM offshore of the local Atlantic Coast through the day on Sept. 4, 2019, as a Cat 2 storm on its closet approach. Ahead of Dorian, elevated King Tides and persistent onshore flow already raised water levels within the local estuaries by about 1-1.5 ft including the ICWW and St. Johns River basin. Total water rise (storm tide) associated with Dorian was up to 3.2 ft MHHW along the St. Johns county coast to about 1.5-2 ft MHHW within the St. Johns River basin.  Heaviest rainfall was confined to a couple bands in St. Johns & Flagler counties. Wind damage was confined to the immediate coast and areas generally east of the I-95 corridor. There was damage to some beach structures including piers and boardwalks. Some homes flooded in Davis Shores of St. Augustine due to surge flooding & rainfall.

Tropical Storm in COASTAL NASSAU, FLORIDA
From 04-SEP-19 13:26:00 to 04-SEP-19 13:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

At 2:26 pm on 9/4, broadcast media showed a video of minor flooding from water pushed onto North Front Street near Center Street. At 2:30 pm, the water level reached 2.55 ft MHHW at the Fernandina Beach tide gauge. Coastal flooding was estimated to begin at 2 ft MHHW. This water level was the highest level recorded since 3.58 ft above MHHW that occurred during Hurricane Irma. The 2.55 ft MHHW was ranked as the 11th highest storm surge value on recorded for this site. The Fernandina Beach Airport measured a peak wind of 32 mph on 9/4 at 1:55 pm with a peak gust of 45 mph  at the same time. The NOS station at Fernandina Beach measured a peak wind of 31 mph on 9/4 at 1:18 pm and a peak wind of 48 mph at the same time.

Tropical Storm in COASTAL DUVAL, FLORIDA
From 04-SEP-19 10:47:00 to 04-SEP-19 16:40:00 (EST-5)
Property damage: 10.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Dorian impacts to the county were mainly confined to the immediate beachfront. Scattered trees and large limbs were blown down, and some of this tree debris blocked roads. Most of the tree damage was confined to Arlington and the beaches communities. Storm tide flooding was a larger impact than wind damage and produced flooding and damage to the immediate coast with most damage to Huguenot Park where the boardwalk was majorly damaged. Part of the boardwalk was broken off by wave action and deposited about 100 yards up the beach. The access road to Huguenot Park was completely flooded by storm surge flooding. The Jacksonville Beach Pier sustained damage but the extend was not yet determined. Sand loss occurred to the berm along the entire coast. Farther inland along the St. Johns River in downtown Jacksonville, storm surge flooded the immediate River Walk and overflowed Hogans Creek. At this time structure flooding was unknown. At 1147 am on 9/4, the media reported photos of a large tree that was blown down onto cars in the Lakeshore neighborhood near Ortega. At 2 pm, the storm surge value reached 2.13 ft MHHW at the Mayport tide gauge. Coastal flooding begins at 1.8 ft MHHW at this location. This storm surge value was the highest recorded since the 2.8 ft value measured during Hurricane Irma and the 2.13 ft MHHW value tide for the 10th highest storm surge value measured at this location. Peak winds included 32 mph (gusts 51 mph) at NAS Mayport , 32 mph (gusts 43 mph) at Jacksonville International Airport, 30 mph (gusts to 45 mph) at Cecil Field on the JAX Westside and 36 mph (gusts 48 mph) at NAS Jacksonville on the St. Johns River. Other observations from the WeatherFlow mesonet included 41 mph (gusts 54 mph) at Huguenot Park, 44 mph (gusts 55 mph) at the Jacksonville Beach Pier, 43 mph (gusts 55 mph) at Buck Island west of Mayport in the St. Johns River, and 28 mph (gusts 41 mph) at the Terminal Channel in downtown Jacksonville.

Tropical Storm in COASTAL ST. JOHNS, FLORIDA
From 04-SEP-19 12:15:00 to 04-SEP-19 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

At 115 am on 9/4, the St. Augustine Pier reported a sustained wind of 44 mph with a gust to 52 mph. At 155 pm, a storm surge value of 3.16 ft MHHW datum was measured at the temporarily deployed USGS Tidal Gauge along the Tolomoto River near St. Augustine. Coastal flooding for this location begins around 1.6 ft MHHW. At 3 pm, the water level reached 2.52 ft MHHW on the Tolomoto River north of St. Augustine airport via a DEP Tide Gauge. Coast flooding occurs around 1.2 ft MHHW at this location. This was the highest sea levle rise since 3.61 ft MHHW during Hurricane Irma in 2017.  There were some homes flooded in the Davis Shores neighborhood near St. Augustine. A new cut in the beach was formed near Summerhaven. There was overwash and beach erosion observed in Vilano Beach. Trees and branches were blown down within the St. Augustine city limits. The St. Augustine C-Man station recorded a peak sustained wind of 51 mph on 9/4 at 9 am with a peak gust of 62 mph on 9/4 at 8:58 am.  The Weatherflow mesonet sensor at Cresent Beach Summerhouse measured a peak wind of 39 mph on 9/4 at 6:48 am and a peak gust of 58 mph on 9/4 at 108 am. The peak wind measured at the St. Augustine Airport was 38 mph on 9/4 at 1:46 am with a peak gust of 47 mph on 9/4 at 1:45 am. Storm total rainfall of 3.47 inches was measured about 6 miles SSW of Palm Valley and 3.31 inches about 2 miles S of Sawgrass.

Tropical Storm in COASTAL FLAGLER, FLORIDA
From 04-SEP-19 03:00:00 to 04-SEP-19 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

At 4 am on 9/4/19, emergency management reported that the Hammock Dunes Bridge weather system measured a sustained wind of 39 mph. At 7:54 am, emergency management reported power lines were blown down on Annette Street in Flagler Beach. At 9:20 am, a HAM radio operator reported a wire down, laying across Wellstream Lane northeast of Bunnell. At 2:15 pm, a residential deck collapsed and a fence was damaged in North Ocean Shore. Storm total rainfall across the county ranged from 3 - 6 inches, with the higher amounts 5-6 miles SSW of Palm Coast.