The tornado outbreak of April 15–16, 1998, also known as the 1998 Nashville tornado outbreak, was a two-day tornado outbreak that affected portions of the Midwestern United States, Mississippi and Tennessee Valleys on April 15 and April 16, 1998, with the worst of the outbreak taking place on the second day. On that day, 13 tornadoes swept through Middle Tennessee—two of them touching down in Nashville, causing significant damage to the downtown and East Nashville areas. Nashville became the first major city in nearly 20 years to have an F2 or stronger tornado make a direct hit in the downtown area.
Meteorological synopsis
{| class="wikitable" style="margin:0 0 0.5em 1em;float:right;clear:right;"
|+Outbreak death toll
|-
!State
!Total
!County
!County<br />total
|-
|rowspan=1 bgcolor="#e6e9ff"|Arkansas
|rowspan=1 bgcolor="#e6e9ff"|2
|Mississippi
|2
|-
|rowspan=2 bgcolor="#e6e9ff"|Kentucky
|rowspan=2 bgcolor="#e6e9ff"|3
|Barren
|2
|-
|Metcalfe
|1
|-
|rowspan=4 bgcolor="#e6e9ff"|Tennessee
|rowspan=4 bgcolor="#e6e9ff"|8
|Bradley
|1
|-
|Davidson
|2
|-
|Dyer
|2
|-
|Wayne
|3
|-
|bgcolor="#e6e9ff"|Totals
|bgcolor="#e6e9ff"|12
|colspan=2|
|-
|colspan=4 align=center| <small>All deaths were tornado-related</small>
|-
|}
One week after the Birmingham tornado outbreak took place across Alabama and Georgia on April 8–9, 1998 and several other Midwestern and Eastern United States states on April 6–7, a similar pattern developed across the Midwest and southeastern United States starting on April 16, 1998. A very strong low pressure system developed across the central part of North America and was associated with a long cold front. Ahead of the storm, the warm moist air generated from the Gulf of Mexico increased the likelihood for a significant weather event. On April 15, activity developed across the Mid-Mississippi Valley and southern Ohio Valley where several tornadoes touched down in Illinois starting in the late afternoon before moving into Arkansas during the overnight hours where the first fatalities were reported.
thumb|left|200px|The Tennessee state flag which flew over the Capitol during the outbreak; its middle three-star emblem was ripped out during the storm. This flag is on display at the Tennessee State Capitol.
On April 16, as the main low-pressure system was near the Great Lakes and its cold front crossing the Mississippi River, dew points reached the mid to upper 60s across the Tennessee Valley while later in the day, CAPE values reached 1600 J/kg while dry air intrusion was also on the rise increasing the threat of severe weather across the area. As the bulk of the supercells moved out of Arkansas, the tornadic activity was slower during the morning hours before re-intensifying west of Nashville early in the afternoon. Major tornadoes struck from southern Tennessee to southern Kentucky with additional storms as far north as Michigan and several other storms in Alabama across Walker and Cullman Counties, which was slightly north of the areas that were hardest hit by the previous outbreak.
Confirmed tornadoes
Downtown Nashville–Mount Juliet, Tennessee
left|150px|thumb|Damage near the Tulip Grove Mansion, part of [[The Hermitage (Tennessee)|The Hermitage]]
left|200px|thumb|More damage near the Tulip Grove Mansion
This intense and significant tornado touched down near the intersection of Charlotte Pike and Forty-Sixth Avenue and traveled directly through downtown Nashville. The tornado manifested itself as a large area of rapidly rotating rain curtains and dark clouds, rather than a traditional funnel. After crossing the Cumberland River, it passed through East Nashville, Donelson, and Hermitage before finally lifting northwest of Lebanon in extreme northern Wilson County. An ROTC student from Vanderbilt University was trapped under a fallen tree in Centennial Park and later died from his injuries. The tornado blew many windows out of office buildings. Many large buildings, including skyscrapers, were damaged. The TPAC building had over 100 windows blown out. 30 small airplanes were damaged at Cornelia Fort Airport. 35 total buildings in downtown Nashville were deemed structurally unsound after the tornado. The tornado blew down 3 construction cranes on the construction site of the Tennessee Oilers' football stadium near the Cumberland River, before crossing the river. Many signs were downed throughout downtown as well.
The tornado continued east and hit the residential section of East Nashville. At least 300 homes were damaged in East Nashville, many of which lost a good part of their roofs, with a few destroyed. Trees were uprooted and telephone poles were knocked down in this area. A nursing home was hit and all the residents had to be evacuated. A church, which was well over 100 years old, received major damage. It then re-crossed the Cumberland River, where more trees were downed and more homes and other buildings were damaged across Donelson and Hermitage. Over a thousand trees were blown down at Andrew Jackson's home, The Hermitage. Some of those trees were well over 200 years old, with a few having been planted by Andrew Jackson himself. A 2013 reanalysis noted that tornado would have likely been rated EF2 if the Enhanced Fujita Scale was operational at that time.
Nearly 22 years later, a long-tracked high-end EF3 tornado passed just north of Downtown Nashville just after midnight on March 3, 2020. That tornado moved along a more easterly path that intersected with the path of this tornado in East Nashville. It then continued east along Interstate 40 through Wilson and Smith counties. That tornado killed five people, injured 220, and caused $1.504 billion in damage, making it the 6th costliest tornado in US history.
Lawrence County, Tennessee
left|thumb|[[NOAA radar image of the Nashville and southwestern Tennessee supercells.]]
No fatalities were reported with this large and violent F5 wedge tornado as it touched down just inside Wayne County and traveled through sparsely populated areas of Lawrence County, west and northwest of Lawrenceburg. There were 21 injuries, however. It did not significantly affect any towns along its path.
However, many large and well-built homes with anchor bolts were completely leveled with some swept clean from their foundations, and vehicles were thrown hundreds of yards. One truck was rumored to have been taken about , though this was never confirmed. A 200-foot section of grass was scoured away at a pasture, leaving only bare soil behind. Clumps of dirt were pulled up as well. Many trees and power lines were downed as well as 75 utility poles. Some of the trees were completely debarked, and several livestock were killed as well.
It is the most recent Tennessee F5/EF5 and only official one as the March 11, 1923 Pinson tornado took place before the introduction of the Fujita scale and before records were officially kept.