Summary of August 16, 2016 Severe Storms and Flash-Flooding

Overview

During the evening of August 16, 2016 severe thunderstorms produced hail and heavy rain in many Minnesota and Wisconsin counties. In Minnesota, 1.5 inch hail was reported in Hennepin and Cass counties and over 3 inches of rain fell in Burnsville, Lakeville, and Shakopee. There was flash-flooding in Burnsville, Eden Prairie, and Apple Valley as well.

Severe thunderstorm warning (yellow), flash-flood warnings (green), and rainfall (in inches) around the Twin Cities metro

Warnings
Photos
Radar
Storm Reports
Environment

Flash-Flood and Severe Thunderstorm Warnings


Flash-flood warning issued at 7:05 PM for Barron, Chippewa, and Dunn counties	Flash-flood warning issued at 5:16 PM for Dakota, Scott, Carver, and Hennepin counties	Severe thunderstorm warning issued at 5:05 PM for Anoka, Ramsey, and Hennepin counties


Severe thunderstorm warning issued at 6:21 PM for Le Sueur and Rice counties	Severe thunderstorm warning issued at 10:58 PM for Blue Earth and Faribault counties

Photos:


Flying Cloud Drive mudslide in Eden Prairie (photo courtesy of Collin Leck)	Street flooding in Lakeville (photo courtesy of Tim Lundahl)	Prior Lake flooding (photo courtesy of Lindsay Jenner)	Bunker Hill Park flooding in Lakeville (photo courtesy of Tim Lundahl)

Radar:

NEXRAD reflectivity loop from 6:00 to 8:00 PM CDT

Storm Reports


Local reports of rainfall, hail, and flash-floods	SPC Storm Reports

Environment

High humidity, weak upper and lower-level winds, a trough axis over Minnesota, and the passage of a cold front allowed for a favorable severe storm/flood environment. Multiple storms tracking over the same area led to flooding in many cities.


National Forecast Chart	12Z surface map analysis showing high humidity and very weak winds over MN and WI	850 mb map analysis at 0Z


500 mb map analysis at 0Z	250 mb map analysis at 0Z

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