Low pressure deepened over eastern Colorado and moved eastward along a stationary front into southern Illinois through the morning of the 9th before the front moved south of the Ozarks. Strong to severe storms moved over the region during the early morning of the 9th. Hail up the golf ball size occurred in Barry County southeast of Cassville, and several locations along the south of Highway 60 reported wind damage to trees and powerlines. Several rounds of rainfall led to flooding near Ava and Mountain Grove in Douglas County, near Sycamore and Hardenville in Ozark County, and near Bradleyville in Taney County.

Hail in MCDONALD, MISSOURI
From 09-MAY-21 01:38:00 to 09-MAY-21 01:38:00 (CST-6)
Location: CAVERNA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter to half dollar sized hail was reported just north of the Arkansas state line.

Hail in MCDONALD, MISSOURI
From 09-MAY-21 01:53:00 to 09-MAY-21 01:53:00 (CST-6)
Location: JACKET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Quarter size hail was reported.

Hail in BARRY, MISSOURI
From 09-MAY-21 02:02:00 to 09-MAY-21 02:02:00 (CST-6)
Location: CASSVILLE FLDS ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Golf ball size hail was reported.

Hail in MCDONALD, MISSOURI
From 09-MAY-21 01:40:00 to 09-MAY-21 01:40:00 (CST-6)
Location: CAVERNA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ping pong ball size hail was reported.

Hail in POLK, MISSOURI
From 09-MAY-21 03:22:00 to 09-MAY-21 03:22:00 (CST-6)
Location: MORRISVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported.

Hail in DOUGLAS, MISSOURI
From 09-MAY-21 03:57:00 to 09-MAY-21 03:57:00 (CST-6)
Location: GOODHOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter size hail was reported.

Hail in MCDONALD, MISSOURI
From 09-MAY-21 01:32:00 to 09-MAY-21 01:32:00 (CST-6)
Location: CAVERNA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ping pong ball hail was reported.

Hail in GREENE, MISSOURI
From 09-MAY-21 02:57:00 to 09-MAY-21 02:57:00 (CST-6)
Location: PHENIX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter size hail was reported.

Lightning in DOUGLAS, MISSOURI
From 09-MAY-21 05:18:00 to 09-MAY-21 05:18:00 (CST-6)
Location: AVA
Property damage: 37.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Lightning struck the Ava High School damaging seven network switches.

Flood in DOUGLAS, MISSOURI
From 09-MAY-21 04:56:00 to 09-MAY-21 12:00:00 (CST-6)
Location: AVA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Street flooding was reported in Ava.

Flood in TANEY, MISSOURI
From 09-MAY-21 08:28:00 to 09-MAY-21 16:00:00 (CST-6)
Location: BRADLEYVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Old Cheese Plant Road was flooded at Little Beaver Creek and was closed to traffic.

Flood in DOUGLAS, MISSOURI
From 09-MAY-21 05:55:00 to 09-MAY-21 14:00:00 (CST-6)
Location: AVA MUNI MEML ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

State Highway Y was closed at Cowskin Creek due to flooding. Water was flowing two feet deep.

Flood in DOUGLAS, MISSOURI
From 09-MAY-21 08:55:00 to 09-MAY-21 16:00:00 (CST-6)
Location: AVA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Highway FF was closed due to flooding at Hunter Creek.

Flood in DOUGLAS, MISSOURI
From 09-MAY-21 08:55:00 to 09-MAY-21 16:00:00 (CST-6)
Location: OLATHE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Highway U was closed at Bryant Creek due to flooding.

Flood in WRIGHT, MISSOURI
From 09-MAY-21 11:00:00 to 09-MAY-21 16:00:00 (CST-6)
Location: MANSFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Highway AB at Wolfe Creek was flooded and impassable.

Flood in OZARK, MISSOURI
From 09-MAY-21 12:00:00 to 09-MAY-21 16:00:00 (CST-6)
Location: MAMMOTH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Highway T at Walk Creek was flooded and impassable.

Flood in DOUGLAS, MISSOURI
From 09-MAY-21 14:00:00 to 09-MAY-21 18:00:00 (CST-6)
Location: ANN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway EE at the North Fork River was flooded and impassable.

Flood in OZARK, MISSOURI
From 09-MAY-21 14:15:00 to 09-MAY-21 18:00:00 (CST-6)
Location: SYCAMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway 181 at Bryant Creek was flooded and impassable.

Flood in OZARK, MISSOURI
From 09-MAY-21 16:42:00 to 09-MAY-21 22:00:00 (CST-6)
Location: LAWNDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway H was closed at the North Fork River due to flooding.

Thunderstorm Wind in GREENE, MISSOURI
From 09-MAY-21 02:20:00 to 09-MAY-21 02:20:00 (CST-6)
Location: (SGF)SPRINGFIELD ARP
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at the Springfield-Branson National airport recorded a 51 knot peak wind gust.

Thunderstorm Wind in LAWRENCE, MISSOURI
From 09-MAY-21 02:06:00 to 09-MAY-21 02:06:00 (CST-6)
Location: PIERCE CITY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple large tree limbs were reported down.

Thunderstorm Wind in GREENE, MISSOURI
From 09-MAY-21 03:32:00 to 09-MAY-21 03:32:00 (CST-6)
Location: WILDWOOD ESTATES
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Several trees and power lines were reported down at the Springfield Nature Center.

Thunderstorm Wind in DOUGLAS, MISSOURI
From 09-MAY-21 04:11:00 to 09-MAY-21 04:11:00 (CST-6)
Location: AVA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several large tree limbs were reported down.