2019 Super Outbreak (Blackford)

the 2019 Super Outbreak was the largest and costliest tornado outbreak ever recorded. Unlike the 2011 Super Outbreak, which primarily effected the southeastern United States, this system effected the midwestern United States into the Ohio River Valley. It unfolded from April 7 through April 10, 2019. The system produced the only-ever F5/EF5 rated tornado in the state of Nebraska, as well as beat the record for the most violent tornadoes in a tornado outbreak, with 22 violent tornadoes confirmed.

Meteorological synopsis
The outbreak was primarily caused by a large extratropical cyclone that moved into the Midwest on April 6, 2019. Several days out, the Storm Prediction Center had placed most of Iowa and Nebraska under a 30% chance of severe thunderstorms for April 7, however, predictability was low. As the system moved into the forecast area on April 7, strong wind shear in combination with a strong low pressure system, as well as unusually warm temperatures in the high 70s to low 80s lead to a widespread outbreak of strong to severe thunderstorms, including a few strong (EF2 and EF3) tornadoes. The system moved east into the lower Midwest (Eastern Nebraska, Iowa and Northern Illinois) on April 8, in combination with record warm 85-95 degree temperatures and powerful wind shear lead to a explosive tornado outbreak, mainly during the evening and nighttime hours. 10 of the 22 violent tornadoes, including 4 of the 10 EF5's touched down during the nighttime hours of April 8 and morning hours of April 9. As the system moved into the Ohio River Valley on April 9, it produced more severe thunderstorms, including several strong tornadoes. Only 3 violent tornadoes touched down on April 9, all of them in north central Indiana. The system finally moved over central Indiana on April 10, with the remaining 7 violent, 3 of which were EF5 tornadoes touching down. This occurred alongside another 238 tornadoes, mainly in Indiana and Ohio. On April 11, conditions were noted as being much less favorable for tornadoes, but much more favorable for large hail and damaging winds, no tornadoes touched down on April 11, and the system moved off the East Coast early on April 12.

Lincoln, Nebraska-Harlan, Iowa
See article here: 2019 Omaha tornadoThe only violent tornado of the outbreak in Nebraska, as well as the first known EF5 tornado in Nebraska's history. This long-tracked tornado touched down near Pleasant Dale, Nebraska at 0228. The storm moved northeast, intensifying into a EF1 tornado at 0230. Spotters would first confirm the tornado at 0233 as it moved northeast. It would become a EF2 tornado around 0235 as spotters tracked the intensifying tornado. The city of Lincoln was put under a Particularly Dangerous Situation (PDS) tornado warning as the storm approached at 0237. A tornado emergency was declared at 0241 for Lincoln as well as southwestern Omaha as the storm moved adjacent to Interstate 80 near Emerald as a low-end EF3. The tornado intensified into a EF4 around 0245 as it moved into Emerald, where the first death of the entire outbreak occurred. The storm intensified into a EF5 at 0251 as it moved northeast through Lincoln, continuing to move adjacent to Interstate 80. Several houses were removed from their foundations in Lincoln, with several deaths being reported. The storm would continue to move adjacent to Interstate 80, with a tornado emergency being declared for Omaha at 0304. The tornado moved into Omaha at peak intensity at 0314. Widespread EF5 damage was documented in Omaha's suburbs and in downtown Omaha. It weakened to a EF4 at 0331 as it crossed the Missouri River into Iowa. It slowed down, producing EF5 damage in Weston and Underwood, Iowa between 0356 and 0421. The tornado weakened back into a EF4 at 0427 near Neola, Iowa. It further weakened between Shelby and Harlan into a EF3 at 0441. The tornado continued to weaken as it neared Harlan into a EF2 at 0450, and into a EF1 at 0452. The tornado further weakened into a EF0 as it moved into Harlan at 0454. It finally lifted on the outskirts of Harlan, Iowa at 0456.

THIS IS A WORK IN PROGRESS