Hurricane Sally initially formed as an area of disturbed weather over the Bahamas late on September 10th, 2020. Over the next few days, the system became better organized and became Tropical Depression Nineteen in the afternoon hours on September 11th. Later that night around midnight CDT on September 12th, TD Nineteen made landfall at Key Biscayne with peak winds of 35 mph and a central pressure of 1007mb (29.74 inHg). The system continued west emerging into the east-central Gulf of Mexico and quickly strengthened into a Tropical Storm later in the day on the 11th. This system continued to drift northwestward with time and strengthened into a hurricane in the morning hours on September 14th with maximum sustained winds of 85 mph and a central pressure of 985 mb (29.09 inHg) and continued to strengthen becoming a category 2 hurricane shortly after. Sally would then eventually weaken some, and slow down in forward speed before turning very slowly northwards making landfall near Gulf Shores, Alabama as a strong Category 2 hurricane with peak winds of 105 mph and a central pressure of 965mb (28.50 inHg) early in the morning hours on September 16th.
Impacts to southeastern Louisiana and southern Mississippi was mostly confined to coastal counties of southern Mississippi, southeastern Louisiana and adjacent marine areas. Main impacts included storm surge inundation for coastal areas, as well as some wind damage across portions of Jackson and Harrison County, MS while Hurricane Sally was making landfall east across Gulf Shores, AL. Rainfall was of little impact across coastal MS and westward with only small areas of rainfall totaling around 3 inches reported in eastern Jackson county.

Storm Surge/Tide in UPPER ST. BERNARD, LOUISIANA
From 15-SEP-20 13:00:00 to 15-SEP-20 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Impacts to portions of the parish were the result of storm surge and affected areas outside the HSDRRS Levees. USACE observation BDML1 at Bayou Dupree measured peak inundation of 5.92 feet NAVD88 on the 15th at 13:00 CDT.

Tropical Storm in LOWER PLAQUEMINES, LOUISIANA
From 15-SEP-20 17:18:00 to 15-SEP-20 17:18:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several land observations across the lower portions of the parish reported sustained tropical storm force winds with gusts of 45 to 50 mph in areas around Buras and Venice.

Storm Surge/Tide in UPPER PLAQUEMINES, LOUISIANA
From 15-SEP-20 20:00:00 to 15-SEP-20 20:00:00 (CST-6)
Reported by: Other Federal Agency

USACE site COCL1 in upper Plaquemines Parish observed 4.59ft surge inundation on the 15th at 20:00 CDT.

Storm Surge/Tide in LOWER JEFFERSON, LOUISIANA
From 15-SEP-20 08:45:00 to 15-SEP-20 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Impacts from storm surge was outside of the HSDRSS levees. The greatest impacts were across the southern end of the parish. Storm surge flooding affected much of Grand Isle, inundating some areas with 1 to 2 feet of water. The area was cut off when HWY 1 was closed in Lafourche Parish. The mayor of Grand Isle estimates around 90% of its 1100 residents evacuated ahead of the storm. Observations across the area ranged from 2.10ft MHHW inundation at Grand Isle on the 15th at 10:24 CDT to 4.55 NAVD88 at Barataria Pass on the 15th at 08:45 CDT.

Storm Surge/Tide in LOWER ST. BERNARD, LOUISIANA
From 15-SEP-20 12:15:00 to 15-SEP-20 13:12:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Impacts to portions of the parish were the result of storm surge and affected areas outside the HSDRRS Levees. Storm surge flooding overtopped ring levees in the Delacroix and Woodlake areas, resulting in one to two feet of inundation inside those leveed areas. The lower portion of the parish below the Verret Flood gates was cut off due to flooding. Observations across the area ranged in the 5.35 MHHW to 5.92 NAVD88 range in Bayou Dupree (BDML1) and Shell Beach (SHBL1) on the 15th between 12:12CDT and 13:00 CDT.

Storm Surge/Tide in LOWER TERREBONNE, LOUISIANA
From 15-SEP-20 10:45:00 to 15-SEP-20 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Observations from lower Terrebonne parish indicated minor storm surge inundation. Observations ranged from 2.27 NAVD88 at USGS site CTFL1 in Cutoff, LA on the 15th at 13:00 CDT to 3.87 NAVD88 at USGS site CCOL1 SW of Cocodrie on the 15th at 10:45 CDT.

Storm Surge/Tide in ST. JOHN THE BAPTIST, LOUISIANA
From 16-SEP-20 01:00:00 to 16-SEP-20 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

USACE observation PMPL1 Pass Manchac measured peak inundation caused by storm surge of 3.39ft NAVD88 on the 16th at 01:00 CDT.

Storm Surge/Tide in ORLEANS, LOUISIANA
From 15-SEP-20 10:00:00 to 16-SEP-20 02:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Impacts from storm surge affected areas outside the HSDRRS levees. 1 to 2 feet of inundation affected the lowest lying portions of the parish around Lake Catherine and through Irish bayou. Water covered Lakeshore Drive, HWY 90 and other streets in the Venetian Isles area. Observations ranged from 2.71 NAVD88 at PRSL1 on Paris Road on the 16th at 02:00 CDT to 4.96 NAVD88 at USACE gauge CMPL1 Chef Pass on the 15th at 14:00 CDT.

Storm Surge/Tide in ST. TAMMANY, LOUISIANA
From 15-SEP-20 19:00:00 to 15-SEP-20 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Low lying portions of the parish, including Palm Lake, Salt Bayou and bayou Liberty in Slidell and the Lakeshore area of Mandeville were affected by flooding caused by storm surge. Flooding was reported in the Rigolets Marina in Slidell. USACE site LPML1 in Mandeville reported 3.54ft NAVD88 inundation on the 15th at 19:00 CDT.

Storm Surge/Tide in LIVINGSTON, LOUISIANA
From 16-SEP-20 06:00:00 to 16-SEP-20 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Minor storm surge inundation were reported from observation sites in Livingston Parish. USACE site TSPL1 in Springfield measured 4.52ft NAVD88 inundation as well as 3.00 ft NAVD88 at the MAUL1  USGS site at Maurepas on the 16th at 06:00 CDT.

Storm Surge/Tide in LOWER PLAQUEMINES, LOUISIANA
From 15-SEP-20 08:48:00 to 15-SEP-20 14:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Main impacts across the lower portion of Plaquemines Parish were the result of storm surge and areas outside of the HSDRRS Levees. Several roads were covered with water. Specifically, Tidewater road and adjacent roadways in the Venice area were impassible due to 1 to 2 feet of inundation. Parish EM reported roughly 50 to 75% of those under mandatory evacuation orders did evacuate, with 61 people seeking shelter at the parish shelter. Storm surge inundation observations ranged from 3.85 MHHW at the NOS gauge at PILL1 Pilottown on the 15th at 1112 CDT to 6.66 NAVD88 at the USGS site PLHL1 on the 15th 0915 CDT.

Storm Surge/Tide in ST. CHARLES, LOUISIANA
From 15-SEP-20 20:12:00 to 15-SEP-20 20:12:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

NOS observation BCFL1 Bonnet Carre Spillway measured a peak inundation of 3.76 MHHW on the 15th at 20:12 CDT.

Storm Surge/Tide in LOWER LAFOURCHE, LOUISIANA
From 15-SEP-20 09:54:00 to 15-SEP-20 11:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

During the time of highest inundation caused by storm surge, 2 to 3 feet of water covered portions of LA HWY 1 south of the Golden Meadow flood gate. The road was closed, completely cutting off areas south of the flood gate. USGS observation site HACL1 Hackberry Bay measured 2.63ft inundation on the 15th at 11:15 CDT. NOS observation site PTFL1 Port Fourchon measured a peak inundation of 2.69 MHHW on the 15th 09:54 CDT.