Severe Thunderstorm and Heavy Rainfall Summary - May 19-20, 2011

A disturbance associated with a potent upper level low pressure system located in the Central Rockies crossed the Plains on Thursday the 19th, bringing a round of afternoon and evening strong to severe thunderstorms to portions of South Central Nebraska and North Central Kansas, which were accompanied by heavy rain, hail, and strong winds.  Although the severe weather threat subsided by midnight, storms with locally heavy rainfall continued into the early morning hours on the 20th.

Southeastern portions of the Hastings coverage area reported several inches of rain, anywhere from 1 inch to as much as 5 inches, which was reported in Ohiowa in Fillmore County.  This heavy rainfall led to plenty of flooding on fields, roads and rivers, including the Republican River near Guide Rock, and the South Fork Solomon near Portis.  The largest reported hail on the 19th was quarter size, in both Osborne and Thayer Counties, and some minor wind damage was reported on the south side of Natoma Kansas in Osborne Kansas.

Below is a list of PRELIMINARY Local Storm Reports received during this event, and a map of 48 hour rainfall totals:

 Preliminary Storm Reports for May 19-20, 2011
(click image for detailed information)
48 Hour Rainfall Totals ending
May 20, 2011.  (click image to enlarge)

Below is a table of 24-hour rainfall amounts ending Friday morning, May 20, 2011.  These reports come from a combination of Cooperative Observers and NeRain/CoCoRaHS Observers. 

Location

Rainfall Total

Ohiowa

5.00

9.9 SSW Beloit

4.17

4.8 SSE Deweese

4.12

4.1 WNW Alexandria

4.00

6.3 N Nelson

3.98

6.7 SSE Lawrence

3.91

5.2 S Clay Center

3.70

2.1 WSW Tobias

3.66

1.6 S Fairfield

3.58

4.3 E Red Cloud

3.50

Smith Center, KS

3.33

Hebron

3.26

4.8 SSE Clay Center

3.15

0.6 WNW Gilead

3.03

8.4 NW Superior

2.99

1.9 E Edgar

2.90

1.3 ENE Hebron

2.90

2.4 NW Edgar

2.85

Hubbell

2.85

3.5 ENE Lawrence

2.80

Lebanon, KS

2.75

0.2 NE Benedict

2.74

0.3 SW Nelson

2.73

Hunter, KS

2.64

Red Cloud

2.60

Burr Oak

2.48

Superior

2.36

1.6 SE Stromsburg

2.21

4.9 SSW York

2.21

Mankato, KS

2.12

Fairmont

2.04

Alton, KS

1.90

Ionia, KS

1.88

Beloit, KS

1.88

3W Gresham

1.86

3 NE Shelby

1.78

Riverton

1.34

 

This page was composed by the staff at the National Weather Service in Hastings, Nebraska.



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