Extreme Heat Across the Southern U.S.; Flash Flooding Threats in the Mid-Atlantic, Northeast, and Four Corners Region

Dangerous and extreme heat will remain across portions of the southern U.S. this week. Heavy rainfall may bring significant flash flooding across portions of the Mid-Atlantic and Northeast through the night, and additional flash flooding concerns across New England on Wednesday. Monsoonal thunderstorms will bring a flash flood risk to the Four Corners region, especially in burn scar areas Read More >

Overview

Nearly stationary thunderstorms developed over and near Custer, SD during the afternoon of August 2nd, 2019. Radar estimates indicated that 6-7" of rain fell to the west of Custer, with measured observations as high as 5.35". Rainwater moved downstream along French Creek, causing severe flooding in the town of Custer through the evening. Road closures and some evacuations were reported by the Custer County Sheriff's Office before water began to recede during the night of the 2nd into the morning of the 3rd.

Photos and Video
Rainfall and Flooding Reports
Environment

Photos and Video

UAV (drone) Footage of the Flooding in Custer, courtesy of Custer County Search and Rescue

Flooding in Custer from Custer County Sheriff

Flooding in Custer from Custer County Search and Rescue

Flooding in Custer from Black Hills Energy

Rainfall and Flooding Reports

Radar-estimated storm total rainfall near Custer during the afternoon of August 2nd, 2019

Radar loop from 12:30 PM through 4:45 PM on August 2nd, 2019
(for higher resolution, please view on YouTube)

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....

0257 PM HEAVY RAIN 1 SSW CUSTER 43.75N 103.61W
08/02/2019 M2.21 INCH CUSTER SD TRAINED SPOTTER

FELL IN 90 MINUTES

0400 PM FLASH FLOOD 3 WNW CUSTER 43.78N 103.66W
08/02/2019 CUSTER SD LAW ENFORCEMENT

RUBY CREEK BETWEEN CUSTER LIMESTONE ROAD AND UPPER
FRENCH CREEK ROAD OUT OF ITS BANKS.

0400 PM FLASH FLOOD 2 WSW CUSTER 43.76N 103.64W
08/02/2019 CUSTER SD SOCIAL MEDIA

WATER OVER UPPER FRENCH CREEK ROAD AT HOOVER COURT.

0412 PM HEAVY RAIN 6 WNW CUSTER 43.80N 103.71W
08/02/2019 M5.35 INCH CUSTER SD SOCIAL MEDIA

RESIDENT JUST OFF OF ELLIOT ROAD NW OF CUSTER.

Environment

The near-storm environment on the evening of August 2nd, 2019 was favorable for slow-moving thunderstorms capable of heavy rainfall. Precipitable water (a measure of total atmospheric moisture content) values were between the 75th and 90th percentiles, meaning that moisture content was within the upper 25% of data on record for this time of year.


Figure 1: August 2nd, 2019 upper-air sounding and hodograph for Rapid City, SD at 6 PM (00z on the 3rd)	Figure 2: Comparison of precipitable water (measure of atmospheric moisture content) for Rapid City's August 2nd, 2019 evening sounding (shown as grey dot) to climatology

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Extreme Heat Across the Southern U.S.; Flash Flooding Threats in the Mid-Atlantic, Northeast, and Four Corners Region

August 2, 2019 Heavy Rainfall and Flooding in Custer, SD