SPC meteorologists began to recalculate model data during the morning to account for the stronger wind profiles caused by the jet streak; the data acknowledged that thunderstorms would occur within the Central Plains, but disagreed on the exact area of greatest severe weather risk.
12.
Forecasters at the SPC initially underestimated the atmospheric conditions that would support tornadic development that afternoon and evening; around 4 : 00 a . m . CDT, Doppler radar and wind profile data indicated a jet streak along the border of California and Nevada, with weather balloon soundings sent up the previous evening by National Weather Service offices in the western United States and numerical computer model data failing to detect the fast-moving air current as it moved ashore from the Pacific Ocean.
