At least five strong tornadoes affected Washita County, Oklahoma, during this outbreak.
Antedating upper atmospheric measurements, most data collection was of human observations, along with temperature, pressure, wind speed and direction, and rainfall.
[1] A cold front moved south through Oklahoma into Texas on April 26, before stalling as a stationary front draped across Central Texas, oriented from northeast to southwest.
Early on April 27, it pushed back northward against a warm front to the east, due to a vigorous upper-atmospheric trough approaching from the west.
The warm front was noted to have moved from the southeast on April 27 to the northeast on April 28; this movement of warm air against the cold front, in proximity to a low-pressure area over western Oklahoma, provided sufficient atmospheric lift, thereby fuelling the storms that provided the tornado activity.