Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

A cold front will cross the Great Lakes and Northeast U.S. through Monday with gusty winds and areas of rain showers. A strong atmospheric river is expected to move into the Pacific Northwest by midweek bringing a threat for moderate to heavy rainfall, gusty winds, and mountain snows for parts of Washington, Oregon, northern California, and the Sierra Nevada. Read More >

Overview

Severe thunderstorms developed along and ahead of a cold front moving southeast across central South Dakota during the late afternoon and evening hours on August 30th, 2020. These thunderstorms produced hail up to 2" in diameter and an EF-2 tornado north of Miller, SD which resulted in a fatality when an RV was struck on SD HWY 45. This was the first tornado-related fatality in South Dakota since June 4th, 1999.

We wish to thank emergency management, first responders, storm chasers, trained spotters, and the public for the information they provided to us during and after the event.

Tornado picture at 6:13 PM north of Miller, SD. Photo taken by Lucus Howard


Surface weather chart at 4pm on August 30, 2020. The cold front in western and northern South Dakota was moving southeast across the state.	"Sandwich" satellite loop of the storms from 4pm to 9pm on August 30, 2020.	Radar loop of the severe thunderstorms that occurred during the evening of August 30, 2020.

Tornado
Storm Reports

Tornadoes

Tornado - 13 North of Miller, SD
Hand County

Date	August 30, 2020
Time (Local)	6:03-6:13 pm CDT
EF Rating	EF-2
Est. Peak Winds	135 mph
Path Length	1.6 miles
Max Width	300 yards
Injuries/Deaths	1 death
Summary: The tornado initially touched down in pasture land east of SD HWY 45, roughly 0.8 miles south of 184th St. It continued to track north for roughly 0.6 miles, damaging a tree grove and fence line. The track then turned west northwest and crossed SD HWY 45, roughly 0.2 miles south of 184th ST. A southbound RV pulling an enclosed trailer was struck. The trailer detached from the RV and the RV was lofted and rolled roughly 200 yards into a corn field on the west side of SD HWY 45. The tornado track continued west northwest through the corn field for an estimated 0.4 miles. The tornado was at its peak width and intensity at this point. Corn was completely flattened in some areas with a distinct convergent pattern noted. As the tornado weakened and roped out the path took a southwest turn and persisted for roughly another 0.6 miles before coming to an end in the corn field. *Details are subject to change pending analysis of additional drone, video and satellite information.

Track Map


Photo by Alex Resel taken around 6:03 pm.	Tornado picture taken at 6:05pm in St. Lawrence, SD by Noah Beck	Tornado near SD Highway 45 (Photo by Tyler Olson)	Tornado to the north of Miller, SD (Photo by Mike Kenney)


Corn flattened by tornado. NWS Damage Survey.	RV destroyed. NWS Damage Survey.	Debris tossed 150 yards. NWS Damage Survey.	Hay from bales hanging in power lines. NWS Damage Survey.

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Storm Reports

24 hour Rainfall, ending at 1pm on August 31, 2020

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

0618 PM     Tstm Wnd Gst     2 S Gorman              44.90N 100.08W
08/30/2020  M55 MPH          Potter             SD   Mesonet          

            Mesonet station 212 Agar (SDDOT). 

1019 PM     Tstm Wnd Gst     3 SE Reliance           43.85N 99.56W
08/30/2020  M53 MPH          Lyman              SD   Mesonet          

            Mesonet station 54 Reliance (SDDOT). 

0759 PM     Tstm Wnd Gst     13 N Vivian             44.12N 100.30W
08/30/2020  M56 MPH          Lyman              SD   Mesonet          

            Mesonet station RFPS2 Vivian 13 N. 

0659 PM     Tstm Wnd Gst     1 NE Stephan            44.26N 99.44W
08/30/2020  M56 MPH          Hyde               SD   Mesonet          

            Mesonet station 183 Mac''s Corner (SDDOT). 

0603 PM     Tstm Wnd Gst     17 W Polo               44.78N 99.45W
08/30/2020  M57 MPH          Hyde               SD   Mesonet          

            Mesonet station 215 JCT SD47/SD26 (SDDOT). 

0629 PM     Hail             5 SW Vayland            44.43N 98.86W
08/30/2020  E1.00 inch       Hand               SD   Public           

            Radar estimated time. 

0614 PM     Hail             Miller                  44.52N 98.99W
08/30/2020  E2.00 inch       Hand               SD   Public           

            Photo on social media. Radar estimated time. 

0610 PM     Tornado          7 SE Polo               44.71N 99.02W
08/30/2020                   Hand               SD   Storm Chaser     

            Approximate time and location, based on 
            several phone and social media reports. 
            Damage reported as well. 

0550 PM     Hail             7 ENE Polo              44.82N 98.98W
08/30/2020  M1.75 inch       Hand               SD   Public           

            Pea to golf ball sized hail. Radar estimated 
            time. 

0515 PM     Hail             9 S Burkmere            44.92N 99.30W
08/30/2020  E1.75 inch       Faulk              SD   Public           

            Stripped leaves off of some beans. 

0526 PM     Hail             3 SSE Pembrook Colony   45.33N 98.98W
08/30/2020  E1.00 inch       Edmunds            SD   Public           

            Radar estimated time. 

0649 PM     Tstm Wnd Gst     3 N Gann Valley         44.08N 98.99W
08/30/2020  M53 MPH          Buffalo            SD   Mesonet          

            Mesonet station 201 Gann Valley (SDDOT). 

0634 PM     Hail             11 N Gann Valley        44.07N 98.98W
08/30/2020  E1.00 inch       Buffalo            SD   Trained Spotter  

            Corrects previous hail report from 3 N Gann 
            Valley. Radar estimated time.

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Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

August 30, 2020 - Hand County Tornado