Preliminary Storm Reports from September 10-11, 2019

Key Points For Sioux Falls Storm Damage

A line of severe thunderstorms produced significant damage across the greater Sioux Falls metro late Tuesday evening and overnight.
One tornado has been confirmed so far. The report was received by the NWS at 11:38 pm CDT. Estimated time of touchdown is 11:25 pm CDT.
The first Tornado Warning for northern Lincoln County, including the southern portions of Sioux Falls, was issued at 11:04 pm. The remainder of Sioux Falls was placed in a Tornado Warning at 11:27 pm.
A Severe Thunderstorm Warning was issued for Sioux Falls at 11:13 pm. The warning mentioned the potential for 80 mph winds and was later increased to 90 mph at 11:27 pm.
A Flash Flood Warning was issued at 11:26 pm CDT for Sioux Falls.
The NWS in Sioux Falls has a survey team out as of Wednesday morning to assess the damage and determine the track, timing and intensity of the tornado or tornadoes around Sioux Falls.

Forecast Concerns for Late Wednesday and Wednesday Night

There is a risk of additional thunderstorms by late afternoon into the overnight hours. Much of the region has been placed in a 'Slight Risk' (2 out of 5 on the scale) from the Storm Prediction Center.
There is also a risk of additional heavy rainfall with a Flash Flood Watch in effect. The risk for heavy rain would be from 7 pm to 7 am.
Please have multiple reliable ways to receive any warning information. Some examples include NOAA Weather Radio, commercial radio, cell phones, and outdoor warning sirens.

Initial Storm Reports Summary

From the evening of Tuesday, September 10, 2019, into the early morning of Wednesday, September 11th, a line of severe thunderstorms moved across southeast South Dakota, northeast Nebraska, northwest Iowa and southwest Minnesota. This line produced numerous reports of wind damage and heavy rainfall, as well as multiple tornadoes. The exact number of tornadoes will be determined through damage surveys later today. Below is a map and list of preliminary reports. A more complete event summary will be completed later today or Thursday.

Map of Preliminary Storm Reports from September 10-11, 2019

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
512 AM CDT WED SEP 11 2019

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

1255 AM     TSTM WND DMG     5 N ELK POINT           42.75N 96.71W
09/11/2019                   UNION              SD   PUBLIC

            1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN
            OFF.

1159 PM     FLOOD            5 W SIOUX FALLS         43.53N 96.84W
09/10/2019                   MINNEHAHA          SD   PUBLIC

            REPORT FROM MPING: RIVER/CREEK OVERFLOWING;
            CROPLAND/YARD/BASEMENT FLOODING.

1147 PM     TSTM WND DMG     3 SE SIOUX FALLS        43.50N 96.70W
09/10/2019                   MINNEHAHA          SD   PUBLIC

            TREE LIMBS DOWN.

1145 PM     TSTM WND DMG     2 W SIOUX FALLS         43.54N 96.77W
09/10/2019                   MINNEHAHA          SD   EMERGENCY MNGR

            STRUCTURAL COLLAPSE WITH PEOPLE TRAPPED
            INSIDE.

1144 PM     FLASH FLOOD      SIOUX FALLS             43.54N 96.73W
09/10/2019                   MINNEHAHA          SD   TRAINED SPOTTER

            STREET FLOODING NEAR MINNESOTA AND 33RD
            STREET.

1142 PM     FLOOD            1 NW SIOUX FALLS        43.55N 96.74W
09/10/2019                   MINNEHAHA          SD   PUBLIC



1132 PM     TSTM WND GST     4 N TEA                 43.51N 96.84W
09/10/2019  E70 MPH          MINNEHAHA          SD   TRAINED SPOTTER



1131 PM     TSTM WND GST     3 SE SIOUX FALLS        43.50N 96.70W
09/10/2019  E70 MPH          MINNEHAHA          SD   PUBLIC

            60 TO 70 MPH WINDS,.

1131 PM     TSTM WND DMG     1 E SIOUX FALLS         43.54N 96.71W
09/10/2019                   MINNEHAHA          SD   PUBLIC

            TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.

1145 PM     HEAVY RAIN       5 NE SALEM              43.78N 97.32W
09/10/2019  M3.25 INCH       MCCOOK             SD   CO-OP OBSERVER



1115 PM     HEAVY RAIN       3 S SALEM               43.68N 97.39W
09/10/2019  M3.20 INCH       MCCOOK             SD   EMERGENCY MNGR



1115 PM     FLASH FLOOD      CANISTOTA               43.60N 97.29W
09/10/2019                   MCCOOK             SD   EMERGENCY MNGR

            SOME STREET FLOODING AROUND TOWN.

1055 PM     TSTM WND GST     3 S CANISTOTA           43.56N 97.29W
09/10/2019  E60 MPH          MCCOOK             SD   EMERGENCY MNGR



1054 PM     TSTM WND GST     3 S CANISTOTA           43.55N 97.29W
09/10/2019  E60 MPH          MCCOOK             SD   EMERGENCY MNGR



1137 PM     HAIL             3 SW ROWENA             43.50N 96.61W
09/10/2019  U0.50 INCH       LINCOLN            SD   PUBLIC

            REPORT FROM MPING: HALF-INCH (0.50 IN.).

1130 PM     TSTM WND GST     3 SSE SIOUX FALLS       43.50N 96.70W
09/10/2019  M70 MPH          LINCOLN            SD   MESONET

            RECORDED BY SDSU MESONET.

1128 PM     TSTM WND GST     4 S SIOUX FALLS         43.49N 96.71W
09/10/2019  E70 MPH          LINCOLN            SD   PUBLIC

            LIMB DAMAGE ON MEDIUM SIZED ASH TREE, WOULD
            ESTIMATE 70 MPH WIND.

1125 PM     TORNADO          4 NW HARRISBURG         43.48N 96.74W
09/10/2019                   LINCOLN            SD   NWS EMPLOYEE

            *** 8 INJ ***
            CORRECTS PREVIOUS TORNADO REPORT FROM 4 NW
            HARRISBURG. CONFIRMED TORNADO SOUTH SIDE OF
            SIOUX FALLS.

1123 PM     TSTM WND DMG     4 NE TEA                43.49N 96.77W
09/10/2019                   LINCOLN            SD   PUBLIC

            REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN;
            SHINGLES BLOWN OFF.

1117 PM     TSTM WND DMG     3 NW TEA                43.48N 96.87W
09/10/2019                   LINCOLN            SD   PUBLIC

            STEEL BARN BLOWN DOWN DEBRIS BLOWN LONG
            DISTANCE MULTIPLE SPRUCE TREES DOWN OTHER
            DAMAGE SOUTH OF HOUSES EAST SIDE OF ROAD.

1035 PM     HEAVY RAIN       4 S PARKSTON            43.34N 97.99W
09/10/2019  M4.40 INCH       HUTCHINSON         SD   PUBLIC

            REPORT VIA SOCIAL MEDIA.

0700 PM     HAIL             GREGORY                 43.23N 99.43W
09/10/2019  M0.70 INCH       GREGORY            SD   TRAINED SPOTTER



1013 PM     HEAVY RAIN       2 N MITCHELL            43.77N 98.03W
09/10/2019  M1.96 INCH       DAVISON            SD   ASOS



1000 PM     HEAVY RAIN       3 W GEDDES              43.26N 98.76W
09/10/2019  M2.10 INCH       CHARLES MIX        SD   MESONET



0809 PM     HAIL             PLATTE                  43.39N 98.84W
09/10/2019  E1.00 INCH       CHARLES MIX        SD   TRAINED SPOTTER



0726 PM     TSTM WND GST     14 W PLATTE             43.39N 99.12W
09/10/2019  M71 MPH          CHARLES MIX        SD   MESONET

            REPORT VIA SD RWIS STATION.

1215 AM     FLASH FLOOD      BROOKINGS               44.31N 96.79W
09/11/2019                   BROOKINGS          SD   LAW ENFORCEMENT

            SEVERAL STREETS AROUND TOWN UNDER WATER.

1151 PM     FLASH FLOOD      BROOKINGS               44.30N 96.79W
09/10/2019                   BROOKINGS          SD   PUBLIC

            REPORT FROM MPING: STREET/ROAD FLOODING;
            STREET/ROAD CLOSED; VEHICLES STRANDED.

0828 PM     HAIL             2 N AVON                43.03N 98.06W
09/10/2019  E1.00 INCH       BON HOMME          SD   FIRE DEPT/RESCUE



0813 PM     TORNADO          5 SSW AVON              42.94N 98.10W
09/10/2019                   BON HOMME          SD   TRAINED SPOTTER

            REPORTED BRIEF TOUCHDOWN 5 MILES SOUTH OF
            AVON LOOKING WEST.

0852 PM     TSTM WND GST     STICKNEY                43.59N 98.44W
09/10/2019  E65 MPH          AURORA             SD   TRAINED SPOTTER



0846 PM     TSTM WND DMG     STICKNEY                43.59N 98.44W
09/10/2019                   AURORA             SD   TRAINED SPOTTER

            SEVERAL SMALL TREE LIMBS DOWN.

0840 PM     TSTM WND GST     WHITE LAKE              43.73N 98.71W
09/10/2019  M53 MPH          AURORA             SD   MESONET

            SDSU STATION.

0832 PM     TSTM WND GST     7 NNW HARRISON          43.54N 98.59W
09/10/2019  E60 MPH          AURORA             SD   TRAINED SPOTTER




&&

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