Excessive Rainfall Possible This Weekend; October Heat Wave in California

A slow moving front will be the focus area for heavy to excessive rainfall and a threat for flash/urban flooding across the northern Gulf Coast and Southeast U.S. through this weekend. Abnormally hot, potentially record-breaking, temperatures will impact southern California and stretch north toward the Bay Area and Central Valley into next week. Read More >

Overview

Severe storms moved across our area during the early to mid morning hours of Monday, August 10th. Large hail and damaging winds were the main hazards, although some areas did experience some heavier rainfall. The line of storms which moved down the Missouri River later formed into a derecho that raced through the Midwest, producing wind gusts over 90 mph in Iowa.

Photos & Video
Radar
Storm Reports
Rainfall

Photos & Video

Large hail over an inch in diameter and wind gusts over 58 mph created the greatest impacts across the area. Some damage to trees and utility poles was reported in Gregory and Charles Mix counties.


Hail in Gregory, SD (Bernadette Drumm Boes)	Hail in Gregory, SD (Bernadette Drumm Boes)	Hail in Gregory, SD (Kerri Fenenga)	Caption (source)

Lightning Illuminated Shelf Cloud near Humboldt, SD (Derek Thompson)	Storms Rolling into Le Mars, IA (Mark & Mitchell Morehead)	View toward Sioux City, IA from 9 E of Le Mars, IA (Dave Nicks)	Caption (source)

Radar

Here's a look at the storm evolution.


Radar loop 4 am - 7 am	Radar loop 7 am - 10 am

Storm Reports

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
733 PM CDT MON AUG 10 2020

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

0929 AM     TSTM WND DMG     4 S ARTHUR              42.28N 95.36W
08/10/2020                   IDA                IA   PUBLIC

            4 OR 5 LARGE BRANCHES DOWN. LOTS OF SMALLER
            BRANCHES AND LEAVES DOWN.

0824 AM     TSTM WND GST     2 SW SERGEANT BLUFF     42.38N 96.38W
08/10/2020  M67 MPH          WOODBURY           IA   ASOS

            DELAYED REPORT. ASOS STATION KSUX SIOUX
            GATEWAY AIRPORT.

0816 AM     TSTM WND DMG     1 N SIOUX CITY          42.52N 96.39W
08/10/2020                   WOODBURY           IA   PUBLIC

            BRANCHES AND PART OF A TREE LAYING IN THE
            ROAD. TREES SWAYED BACK AND FORTH FOR AT
            LEAST 10 TO 15 MINUTES. TIME ESTIMATED FROM
            RADAR.

0800 AM     HEAVY RAIN       TYNDALL                 42.99N 97.86W
08/10/2020  M1.05 INCH       BON HOMME          SD   CO-OP OBSERVER


0516 AM     TSTM WND GST     6 NW ANOKA              43.02N 98.90W
08/10/2020  M73 MPH          GREGORY            SD   MESONET

            CORRECTS PREVIOUS NON-TSTM WND GST REPORT
            FROM 6 NW ANOKA.

0920 AM     TSTM WND GST     2 NW IDA GROVE          42.36N 95.50W
08/10/2020  E70 MPH          IDA                IA   PUBLIC

            TREE LIMBS WERE STREWN ACROSS THE HIGHWAY.

0840 AM     TSTM WND GST     1 SW MOVILLE            42.48N 96.08W
08/10/2020  M58 MPH          WOODBURY           IA   MESONET

            MESONET STATION RSCI4 SIOUX CITY (I-29).

0820 AM     TSTM WND GST     2 SW SERGEANT BLUFF     42.38N 96.38W
08/10/2020  M58 MPH          WOODBURY           IA   ASOS

            ASOS STATION KSUX SIOUX GATEWAY AIRPORT.

0642 AM     HAIL             4 S SCOTLAND            43.09N 97.71W
08/10/2020  E1.00 INCH       BON HOMME          SD   PUBLIC


0635 AM     HAIL             TYNDALL                 42.99N 97.87W
08/10/2020  E1.00 INCH       BON HOMME          SD   CO-OP OBSERVER

            HAIL COVERING THE GROUND, WIND GUSTS AROUND
            45 MPH.

0633 AM     HAIL             TYNDALL                 42.99N 97.86W
08/10/2020  E1.00 INCH       BON HOMME          SD   CO-OP OBSERVER


0555 AM     TSTM WND GST     1 SSE WAGNER            43.06N 98.30W
08/10/2020  M61 MPH          CHARLES MIX        SD   AWOS


0553 AM     HAIL             ROCK RAPIDS             43.42N 96.17W
08/10/2020  E1.00 INCH       LYON               IA   PUBLIC


0545 AM     TSTM WND GST     2 ENE ARMOUR            43.33N 98.31W
08/10/2020  M53 MPH          DOUGLAS            SD   PUBLIC


0545 AM     TSTM WND DMG     LAKE ANDES              43.15N 98.54W
08/10/2020                   CHARLES MIX        SD   LAW ENFORCEMENT

            EXTENSIVE TREE DAMAGE REPORTED IN LAKE
            ANDES.

0537 AM     TSTM WND GST     2 WSW PICKSTOWN         43.05N 98.57W
08/10/2020  M61 MPH          GREGORY            SD   MESONET

            MESONET STATION 244 SD RWIS FT. RANDALL DAM.

0524 AM     TSTM WND DMG     1 NNW GEDDES            43.27N 98.71W
08/10/2020                   CHARLES MIX        SD   TRAINED SPOTTER

            3 UTILITY POLES SNAPPED OFF ABOVE GROUND.

0458 AM     HAIL             2 WNW BURKE             43.20N 99.34W
08/10/2020  E1.00 INCH       GREGORY            SD   TRAINED SPOTTER


0454 AM     HAIL             4 NNW BURKE             43.23N 99.33W
08/10/2020  E1.25 INCH       GREGORY            SD   PUBLIC

            REPORT VIA SOCIAL MEDIA.

0454 AM     HAIL             13 NE BURKE             43.32N 99.12W
08/10/2020  E1.00 INCH       GREGORY            SD   PUBLIC


0433 AM     HAIL             1 SW GREGORY            43.23N 99.43W
08/10/2020  M2.00 INCH       GREGORY            SD   PUBLIC


0325 AM     TSTM WND GST     2 WNW LOOMIS            43.81N 98.14W
08/10/2020  E60 MPH          DAVISON            SD   TRAINED SPOTTER

            2 INCH DIAMETER TREE BRANCHES DOWN IN THE
            YARD.

0250 AM     HAIL             PLANKINTON              43.71N 98.49W
08/10/2020  M1.75 INCH       AURORA             SD   PUBLIC

Rain Reports

Here's a look at 24 hour rainfall totals from across the area.