Excessive Rainfall in the Southern Plains; Extreme Heat Coming to the Southwest U.S.

Heavy to severe thunderstorms may bring areas of excessive rainfall and flooding over parts of the southern Plains through Friday. A Slight Risk of excessive rainfall has been issued. Dangerously hot temperatures are forecast across parts of southern Arizona and far southeastern California Saturday through Monday. An Extreme Heat Watch has been issued. Read More >

Overview

A series of disturbances associated with a persistent area of low pressure over the western half of the U.S. produced several rounds of heavy precipitation across western South Dakota and northeastern Wyoming, particularly near and east of the Black Hills and over the Cheyenne River and White River basins. This rainfall, coupled with saturated soils from a wet early spring and flooding over the previous week, led to impactful overland and river flooding across much of the area.

Flooding
Radar
Rainfall

Flooding

Coming off major to record flooding along area rivers the previous week due to widespread heavy precipitation, conditions were primed for additional flooding as rain began on Sunday the 26th. Heavy rainfall of up to 4" was observed near Faith over the north central South Dakota plains, while 1-2" of rain fell over portions of the White River basin. This was the start of several days worth of heavy rain and flooding across portions of the area, which eventually affected much of the South Dakota plains and foothills, along with portions of northeastern Wyoming along the Belle Fourche River and Powder River. The event culminated with heavy rainfall and thunderstorms over the Rapid City area during the afternoon and evening of May 31st, which led to widespread flooded roadways and multiple water rescues.

Photos and Video


Flooding near Hermosa on May 28th. Images courtesy of the Battle Creek Fire Department.

Flooding along South Valley Drive in Rapid Valley on May 28th. Video courtesy of the Rapid City Police Department.


Flooding on Melody Lane and South Valley Drive in Rapid Valley on May 28th. This flooding prompted evacuations. Photos courtesy of the Rapid City Fire Department.