Mainly between 11 PM on Friday, September 17th and 2 AM on Saturday, September 18th, a supercell thunderstorm slowly moved across northern Valley County Nebraska into western and southern Greeley County. This storm developed well north of a seasonably strong cold front located near the Nebraska-Kansas state line, in an area of strong instability rooted well above the surface.
Here are a few "highlights" of the event, based on reports from local law enforcement and automated wind equipment:
Locally Heavy Rainfall:
In addition, overnight storms dumped some locally heavy rainfall of 1-3 inches, mainly across parts of Valley, Greeley, Nance and northern Polk Counties. Through approximately 9 AM, Sept. 18th, a few of the highest known gauge readings within the area include:
This page was composed by the staff at the National Weather Service in Hastings, Nebraska.