Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain
County/Area HOWARD
Report Source Law Enforcement
NCDC Data Source CSV
Begin Date 2011-05-20 18:00:00.0 CST-6
Begin Location 5ESE ST LIBORY
Begin Lat/Lon 41.0463/-98.2849
End Date 2011-05-21 14:00:00.0 CST-6
End Location 4E ST LIBORY
End Lat/Lon 41.0799/-98.2849
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 25.00K
Crop Damage 500.00K
Episode Narrative Only 12-24 hours after significant rainfall drenched eastern sections of South Central Nebraska resulting in considerable lowland flooding and closure of several county roads, another round of heavy rain-producing storms flared up mainly between 2 PM and 9 PM CDT on Friday the 20th. This time around, the highest rainfall amounts focused a bit farther west, and especially near the Highway 281 corridor from Hall to Greeley Counties. For the 24-hour period ending on the morning of the 21st, one of the highest measured rain totals was 3.74 inches, southwest of Spalding in Greeley County. Also, for the calendar day of the 20th, Central Nebraska Regional Airport in Grand Island established a new daily rainfall record of 2.46 inches. The concentrated heavy rain just north of Grand Island resulted in flooded roadways near the intersections of Hall, Howard and Merrick Counties.
Although the mesoscale environment was supportive of severe weather given surface-based CAPE around 1000 J/kg and deep-layer vertical wind shear around 40 knots, the storm mode was predominantly multicell, fostering the heavy rain threat as storms trained from south to north over many of the same areas. That being said, the combination of low cloud bases and sufficient low level vorticity in the vicinity of a weak cold front resulted in a few reports of funnel clouds within South Central Nebraska, including near Grand Island. However, there were no confirmed tornado touchdowns. Looking at the large scale synoptic weather pattern, this was the second of three consecutive days of widespread thunderstorm activity within the area, thanks to an expansive, strong mid-level low pressure system centered near the Wyoming-Montana border on the afternoon of the 20th.
Event Narrative Heavy rainfall across the area resulted in numerous county roads and intersections being closed in the southeastern part of the county. A few remained closed well into the day of the 21st.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 75.00K 1.500M
SPALDING GREELEY CO. NE 05/20/2011 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SPALDING GREELEY CO. NE 05/20/2011 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
(GRI)GRAND IS RGNL A HALL CO. NE 05/20/2011 17:00 CST-6 Flood 0 0 25.00K 500.00K
ST LIBORY HOWARD CO. NE 05/20/2011 18:00 CST-6 Flood 0 0 25.00K 500.00K
WORMS MERRICK CO. NE 05/20/2011 18:00 CST-6 Flood 0 0 25.00K 500.00K
Totals: 0 0 75.00K 1.500M