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

Late in the afternoon on May 18, 2018, a localized thunderstorm moved over Rapid City and dumped two to three inches of rain in about an hour. Runoff from the heavy rainfall flooded streets and low-lying areas. Rapid Creek quickly rose and overflowed its banks near the Fairgrounds. In Rapid City, several water rescues were performed by the fire department. The heaviest rainfall fell over the Robbinsdale area, where the runoff filled a detention pond near the park and tore up sections of asphalt on Fairlane Drive. Several vehicles were pushed by the rushing water and one vehicle ended up in the Robbinsdale Park detention pond.

Flooding
Rainfall

Flooding

Radar/Photos


Radar Storm Total Accumulation with Rainfall Reports	Animation of Radar Reflectivity


Water-swept Truck (Rapid City Fire Dept.)	Water-swept Car (Rapid City Fire Dept.)	Water-damaged Asphalt (Rapid City Fire Dept.)	Flooding of Robbinsdale Pond (Pennington Co. Sheriff's Dept.)

— Rapid City Fire Dept (@RapidCityFire) May 19, 2018

Rain Reports

Map of radar and precipitation amounts

**Rainfall Reports around the Rapid City Area**
Location	Amount	Source
Rapid City 2SSE	2.60	CoCoRaHS
Rapid City NWS	1.79	Rapid City NWS Employees
Rapid Creek at Founders Park	1.32	USGS Automated River Gage
Box Elder Creek near Rapid City	1.06	USGS Automated River Gage
Rapid City 4.7E	0.90	CoCoRaHS
Rapid Creek below Hawthrone Ditch	0.71	USGS Automated River Gage
Rapid Creek at Water Reclamation Facility	0.71	USGS Automated River Gage
Rapid City 3.4 WNW	0.67	CoCoRaHS
South Canyon near Rapid City	0.64	USGS Automated River Gage
South Rapid Foothills	0.50	Private Weather Station
Wild Irishman Gulch near Rapid City	0.25	USGS Automated River Gage
Rapid City Airport	0.21	ASOS
Rapid City RAWS	0.19	RAWS
Box Elder 1.6NE	0.13	CoCoRaHS
Ellsworth Airforce Base	0.08	ASOS

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

May 18, 2018 Rapid City Heavy Rain and Flash Flood