Storm Surge/Tide — Coastal Collier County, Florida

2017-09-10 · Coastal Collier County, Florida

Event narrative

Storm surge across Collier County ranged from 4 to 8 feet, highest in the Chokoloskee and Everglades City area and lowest at the northern Collier County coast. Impacts were most severe in Chokoloskee, Everglades City, Plantation Island and Goodland where numerous homes were flooded and suffered major to catastrophic damage.

Storm survey and data from USGS rapid deployment gauges indicated highest inundation from storm surge in Chokoloskee with up to 8 feet at waterfront, approximately 8 feet above Mean Higher High Water (MHHW), as well as 3-5 feet of inundation across the island.

In Everglades City, a maximum 6 ft of inundation at the Everglades National Park Gulf

Visitor Center, with 2-4 feet across the town and as high as 5 feet in a few areas.

USGS high water mark data showed 1-2 feet of inundation as far inland as Tamiami Trail between State Road 29 and Collier-Seminole State Park.

In Goodland, maximum storm tide was about 5.5 ft above MHHW, translating to between 5-6 ft of inundation at waterfront and 3-4 ft across most of town.

In Marco Island, storm tide was as high as 4.5 feet above MHHW, translating to between 2-4 ft inundation mainly over south and east parts of the island.

Inland penetration was generally less than a half-mile.

In Naples, NOS tide gauge at Naples Pier measured maximum storm tide of 5.14 feet above MHHW. Between 3-4 feet of inundation noted along the Gulf beachfront within 1 block of beach, with less than a half-mile of inland penetration. Highest inundation values noted in Vanderbilt Beach as well as south of Naples Pier. Along Naples Bay, maximum storm tide of about 2-3 ft above MHHW resulting in inundation of 1 to 2 feet on west side of bay just south of Tamiami Trail. This led to flooding of restaurants and shops.

Wider weather episode

Major Hurricane Irma made landfall in Southwest Florida on Marco Island as a Category 3 hurricane around 330 PM EDT on September 10th. The storm traveled north through southwest Florida through the evening. Effects from Irma were felt across South Florida from September 9th through September 11th. Irma had reached Category 5 strength and a minimum central pressure of 914 MB east of the Bahamas, maintaining Category 5 intensity until landfall along the north coast of Cuba on September 9th. Irma made its first Florida landfall in the Lower Florida Keys early on September 10th as a Category 4 hurricane.

The strength and size of Hurricane Irma allowed for impacts to be felt across all of South Florida. Irma brought widespread wind damage, heavy rainfall and storm surge to all areas. Hurricane-force sustained wind were measured in much of Collier County, as well as far southern and inland Miami-Dade County, with the possibility of additional hurricane-force sustained wind in more isolated areas over the remainder of South Florida where widespread tropical storm force sustained wind occurred. Gusts to hurricane force were felt over all of South Florida, with the maximum measured wind gust of 142 mph in Naples in Collier County. Widespread tree damage and some structural damage occurred across all of South Florida, with most structural damage on the minor side.

Irma brought a significant storm surge on both coasts of South Florida. Storm surge of 6 to 8 feet was observed in the Everglades City and Goodland areas of Collier County, with 3 to 5 feet from Marco Island to Naples. Along the east coast, observed storm surge values of 4 to 6 feet were noted along Biscayne Bay from south of Miami to Homestead, and 2 to 4 feet elsewhere along the east coast from Key Biscayne to Palm Beach.

Hurricane Irma brought widespread rainfall and some flooding across the region. From the period between 8 AM EDT September 9th and 8 AM EDT September 11th, 8 to 15 inches of rain were measured over interior portions of Southwest Florida, with estimated amounts of 16 to 20 inches in southwestern Hendry County. This rainfall near the end of a wet summer led to significant flooding over these areas. 5 to 10 inches of rain were noted elsewhere across South Florida, with areas of minor to moderate flooding.

32 deaths were attributed to Irma in southern Florida, all but one indirect. The only direct death was an 86-year-old man who was knocked down by a gust of wind while opening the front door of his home in Broward County. Most of the deaths occurred during cleanup after the storm, as well as several as a result of carbon monoxide poisoning from misuse of generators. Initial and incomplete damage estimate across the area is estimated to be around $800 million, but in all likelihood will be much higher once damage assessments are completed. $222.5 million in damage came in from Collier County, and about $300 million from Palm Beach County. About $255 million came from the agricultural community in Miami-Dade County.

Total number of people who were at county evacuation shelters were as follows: Miami-Dade County - 31,092, Palm Beach County - 17,263, Collier County - 17,040, Broward County - 17,000, Hendry County - 3,000

Total number of customers without power were as follows: Miami-Dade County - 888,530, Broward County - 689,000, Palm Beach County- 566,240, Collier County - 197,630, Hendry County - 9,700, Glades County - 1,670.

Source: NOAA Storm Events Database, event_id 723361. Narrative written by the NWS forecast office that issued the report.