2018 Memorial Day Weekend Heavy Rain and Flooding

Overview

A slow-moving upper-level disturbance produced several rounds of showers and thunderstorms across the Black Hills and adjacent plains over the 2018 Memorial Day weekend. This led to locally heavy rainfall and flooding, particularly near Newcastle in northeastern Wyoming and across portions of Fall River County in South Dakota.

• Flooding
• Rainfall

Flooding

Estimated precipitation between May 27-30

Hydrographs

Cheyenne River near Edgemont	Hat Creek near Edgemont	Horsehead Creek near Oelrichs

 

Images

Newcastle, WY,  near Cambria Creek	Culverts on Oil Creek Road, Weston County, WY	Debris flow remnants, Big Plum Creek Road,  Weston County, WY

 

Weston County, WY, outside of Newcastle	Weston County, WY, outside of Newcastle	Weston County, WY, outside of Newcastle

 

Fall River County, SD	Fall River County, SD	Fall River County, SD

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Rain Reports

Location	State	4-day Total (5/27-30/18)	Source
Newcastle 3.5 E	WY	4.45	CoCoRaHS
Newcastle 0.8 ESE	WY	3.71	CoCoRaHS
Newcastle 26.2 WSW	WY	3.58	CoCoRaHS
Newcastle 13.0 SSW	WY	3.58	CoCoRaHS
Newcastle 1.0 W	WY	3.55	CoCoRaHS
Newcastle 1.7 SW	WY	3.42	CoCoRaHS
Wind Cave	SD	3.5	NWS Cooperative Observer
Newcastle 12.5 NNW	WY	2.89	CoCoRaHS
Rapid City 6.3 SW	SD	2.84	CoCoRaHS
Custer	SD	2.84	NWS Cooperative Observer
Oral	SD	2.79	NWS Cooperative Observer
Rapid City 5.4 SW	SD	2.68	CoCoRaHS
Rapid City 2.0 SSE	SD	2.56	CoCoRaHS
Hill City	SD	2.51	NWS Cooperative Observer
Spearfish 6.7 NNW	SD	2.48	CoCoRaHS
Moorcroft 11.9 ENE	WY	2.47	CoCoRaHS
Upton 18.8 SW	WY	2.37	CoCoRaHS
Hill City 8.4 WNW	SD	2.36	CoCoRaHS
Whitewood 4.2 NNW	SD	2.35	CoCoRaHS
Lead 5.5 SSW	SD	2.35	CoCoRaHS
Upton 11.5 E	WY	2.32	CoCoRaHS
Rapid City 3.9 S	SD	2.32	CoCoRaHS
Hot Springs 0.5 SSW	SD	2.31	CoCoRaHS
Hermosa 6.2 W	SD	2.31	CoCoRaHS
Pactola Dam	SD	2.25	NWS Cooperative Observer
Custer Airport	SD	2.25	ASOS
Beulah 6.1 SW	WY	2.24	CoCoRaHS
Wright 0.8 ENE	WY	2.22	CoCoRaHS
Edgemont 14.2 NE	SD	2.22	CoCoRaHS
Gillette 13.9 NNW	WY	2.21	CoCoRaHS
Wright 0.4 N	WY	2.18	CoCoRaHS
Hot Springs 0.4 NW	SD	2.15	CoCoRaHS
Hill City 4.4 SSW	SD	2.13	CoCoRaHS
Spearfish	SD	2.12	NWS Cooperative Observer
Rapid City 6.2 NNE	SD	2.1	CoCoRaHS
Lead 3.1 NNW	SD	2.1	CoCoRaHS
Rapid City 3.0 N	SD	2.09	CoCoRaHS
Edgemont	SD	2.04	NWS Cooperative Observer
Rozet 4.4 NNE	WY	2.03	CoCoRaHS
Edgemont 0.4 W	SD	2.02	CoCoRaHS
Newcastle 33 WSW	WY	1.99	CoCoRaHS
Wasta 21.6 SSW	SD	1.96	CoCoRaHS
Hot Springs 5.2 NW	SD	1.95	CoCoRaHS
Buffalo Gap 12.0 SE	SD	1.93	CoCoRaHS
Rapid City NWS	SD	1.92	ASOS
Sundance	WY	1.88	NWS Cooperative Observer
Weston 10.9 NE	WY	1.86	CoCoRaHS
Rapid City Airport	SD	1.85	ASOS
Edgemont 2.2 ENE	SD	1.84	CoCoRaHS
Lead	SD	1.81	NWS Cooperative Observer
Spearfish 0.1 WSW	SD	1.8	CoCoRaHS
Piedmont 1 NW	SD	1.8	NWS Cooperative Observer
Rapid City 8.4 W	SD	1.78	CoCoRaHS
Piedmont 4.6 E	SD	1.76	CoCoRaHS
Faith 20.5 NW	SD	1.76	CoCoRaHS
Rapid City 3.5 NE	SD	1.69	CoCoRaHS
Hot Springs 4.2 W	SD	1.68	CoCoRaHS
Custer 17.7 SSW	SD	1.67	CoCoRaHS
Gillette	SD	1.65	NWS Cooperative Observer
Spearfish 1.3 ESE	SD	1.65	CoCoRaHS
Hermosa 0.3 ENE	SD	1.64	CoCoRaHS
Moorcroft 15.0 ENE	WY	1.62	CoCoRaHS
New Underwood 3.9 S	SD	1.6	CoCoRaHS
Ft. Meade/Sturgis	SD	1.59	NWS Cooperative Observer
Oelrichs	SD	1.58	NWS Cooperative Observer
Gillette 9.7 ENE	WY	1.58	CoCoRaHS
Tilford 0.1 N	SD	1.55	CoCoRaHS
Rapid City 3.4 WNW	SD	1.53	CoCoRaHS
Gillette 0.6 NE	WY	1.45	CoCoRaHS
Belle Fourche 0.9 SSE	SD	1.45	CoCoRaHS
Rapid City 4 NW	SD	1.42	NWS Cooperative Observer
Gillette 0.5 ENE	WY	1.41	CoCoRaHS
Union Center 10.5 NW	SD	1.4	CoCoRaHS
Box Elder 1.6 NE	SD	1.4	CoCoRaHS
Upton 12.6 WNW	WY	1.37	CoCoRaHS
Gillette 2.8 SW	WY	1.3	CoCoRaHS
Hermosa 10.3 ESE	SD	1.26	CoCoRaHS
Buffalo Airport	SD	1.21	ASOS
Gillette Airport	WY	1.15	ASOS
Box Elder 6.2 ESE	SD	1.15	CoCoRaHS
Upton 1.0 NNW	WY	1.09	CoCoRaHS
Harding 3 SE	SD	1.09	NWS Cooperative Observer
Devils Tower 2.1 ESE	WY	0.93	CoCoRaHS
Wasta	SD	0.87	NWS Cooperative Observer
Sundance 1.0 ENE	WY	0.78	CoCoRaHS
Faith Airport	SD	0.77	ASOS
Bison 8.7 W	SD	0.71	CoCoRaHS
Newell 6.5 ENE	SD	0.69	CoCoRaHS
Bison 24.1 SW	SD	0.69	CoCoRaHS
Box Elder 8.0 NNE	SD	0.68	CoCoRaHS
Sundance 4.4 E	WY	0.61	CoCoRaHS
Sundance 7.0 SSE	WY	0.6	CoCoRaHS
Faith 36.3 W	SD	0.57	CoCoRaHS
Philip Airport	SD	0.53	ASOS
Newell 2.8 ENE	SD	0.51	CoCoRaHS
Kyle 2 E	SD	0.51	NWS Cooperative Observer
Hulett 0.4 SSE	WY	0.47	CoCoRaHS
Olsonville 4.5 SE	SD	0.42	CoCoRaHS
Red Owl	SD	0.4	NWS Cooperative Observer
Opal	SD	0.4	NWS Cooperative Observer
Mission 14 S	SD	0.39	NWS Cooperative Observer
Carlile 6.7 ENE	WY	0.32	CoCoRaHS
Winner Airport	SD	0.25	ASOS
Lodgepole 5 SW	SD	0.25	NWS Cooperative Observer
Pine Ridge Airport	SD	0.16	ASOS
Hamill 1.7 SW	SD	0.13	CoCoRaHS
White River 12.7 ENE	SD	0.1	CoCoRaHS

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