In Tennessee, a wide swath of winds up to 96 mph (154 km/h) resulted in nearly 65,000 power outages that forced school closures for up to two weeks in several counties, and a 63-year-old man was killed by a downed tree.

After crossing the Yucatán Peninsula into the Bay of Campeche by October 24, the wave spawned a broad area of low pressure.

As such, the NHC upgraded the system to Tropical Storm Olga at 12:00 UTC on October 25 when it was about 390 miles (630 km) south-southwest of Lake Charles, Louisiana.

The final passes conducted by the reconnaissance aircraft a few hours later found strong northwesterly flow and a sharp gradient in temperature and dew point near the center that had either been overtaken by the front or become poorly defined.

[4] As such, Olga transitioned into an extratropical cyclone by 00:00 UTC on October 26,[1] with winds of 50 mph (80 km/h) as the earlier measurements behind the front became representative of the overall system.

It progressed inland across the Eastern United States, crossed Lake Huron, and finally dissipated over southeastern Ontario by 00:00 UTC on October 28.

These winds were short in duration as the remnants of Olga moved rapidly north-northeast, but the severity of the storm caught meteorologists and local officials off guard.

[9] The New Orleans and Lake Charles branches of the National Weather Service expressed their intention to further study the event in order to better prepare for similar systems in the future.

[12] Gusty winds at the Louis Armstrong New Orleans International Airport caused two separate electrical disruptions, resulting in the delay or cancellation of multiple flights; citywide, power outages were estimated around 17,000.

[16] In spite of this fact, dry soil conditions in the lead-up to Olga's remnants alleviated concerns about river flooding.

[10] Water levels of 2–3 ft (0.61–0.91 m) above normal in southeastern Louisiana did cause minor coastal flooding there, including across the Mandeville Lakefront along the northern shore of Lake Pontchartrain.

[18] These strong winds downed countless trees, some up to 3 ft (0.91 m) in diameter,[19] and caused extensive damage to structures and power lines across a 150 mi (240 km) swath through Mississippi and into Tennessee.

[27] The former city automotive museum suffered structural damage when the outer wall of the storage portion of the building collapsed.

[38] The remnants of Olga intensified across central Tennessee as a 5–10 mi (8.0–16.1 km) swath of severe downburst winds, estimated up to 96 mph (154 km/h), cut across Perry, Houston, Humphreys, and Montgomery counties.

[42] The Meriwether Lewis Electric Cooperative reported that 15,000 of the company's 35,000 meters were disabled by the storm, chiefly in Humphreys County.

[44] Sixty-one utility poles and fifteen electricity transformers were disabled throughout the city, representing a harsher blow to the area than an ice storm in February 1994 and F3 tornado in January 1999.

While initial reports drew a connection between Olga and confirmed tornadoes across southwestern Alabama,[47] meteorologists later established them as separate weather events.

[54] The nearby Niagara River also caused local inundation and road closures as waves up to 20 ft (6.1 m) crested over breakwaters across Fort Erie and Crystal Beach.

[56] Cleco brought in 200 contractors and personnel from unaffected communities to repair damaged equipment, cut trees, and clear limbs from power lines.

[58] Given Olga's status as a post-tropical cyclone at landfall in Louisiana, some homeowners questioned whether their damages could be filed as a hurricane deductible.

[59] Two days after the storm, the Louisiana Department of Children and Family Services announced that Supplemental Nutrition Assistance Program recipients whose homes lost power for at least 24 consecutive hours would be eligible for replacement benefits.

[60] In Mississippi, Tupelo Mayor Jason Shelton signed a proclamation of local emergency, declaring the city a disaster area.

[25] In Alcorn County, the American Red Cross established a shelter at the convention center to assist those without power; The Salvation Army provided it with food.

[64] The Poplarville School Board of Trustees engaged with Mississippi Power to approve a $40,729 service agreement to repair damaged light poles.

[65] Citing widespread and severe damage throughout the state, the Mississippi delegation to the United States Congress—senators Cindy Hyde-Smith and Roger Wicker, and representatives Bennie Thompson, Steven Palazzo, Trent Kelly, and Michael Guest—penned a request to U.S. President Donald Trump for full consideration of Governor Phil Bryant's request for a major federal disaster declaration for 16 counties.

[71] In early December, senators Lamar Alexander and Marsha Blackburn, alongside representative Mark E. Green, backed Governor Bill Lee's request to President Trump for federal disaster assistance in ten counties.