The subtropical ridge was to our south while the subtropical jet remained just to our north. An upper-level disturbance in the jet stream passed through on the 22nd. Warm and humid air was in place due to a west-southwest flow around the ridge. Moderate amounts of instability along with the upper-level disturbance caused showers and thunderstorms to develop. Some thunderstorms became severe with damaging winds and large hail.

Hail in HARFORD, MARYLAND
From 22-JUN-10 18:01:00 to 22-JUN-10 18:01:00 (EST-5)
Location: FOUNTAIN GREEN
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball sized hail was reported near Bel Air.

Hail in HARFORD, MARYLAND
From 22-JUN-10 17:58:00 to 22-JUN-10 17:58:00 (EST-5)
Location: GIBSON
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported near Hickory.

Hail in HARFORD, MARYLAND
From 22-JUN-10 18:01:00 to 22-JUN-10 18:01:00 (EST-5)
Location: FOUNTAIN GREEN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported near Hickory.

Thunderstorm Wind in ST. MARY'S, MARYLAND
From 22-JUN-10 20:11:00 to 22-JUN-10 20:11:00 (EST-5)
Location: LNRDTWN ST MARYS ARP
Magnitude: 55.00 MG
Reported by: AWOS

A wind gust of 63 mph was measured at the St. Marys County Regional Airport.

Thunderstorm Wind in ST. MARY'S, MARYLAND
From 22-JUN-10 20:19:00 to 22-JUN-10 20:19:00 (EST-5)
Location: CALIFORNIA
Magnitude: 52.00 MG
Property damage: 1.00K
Reported by: AWOS

Pine Oak limbs were snapped near California.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:55:00 to 22-JUN-10 19:55:00 (EST-5)
Location: BEVERLY BEACH
Magnitude: 52.00 EG
Property damage: 3.00K
Reported by: Public

Large trees were down about one mile west of Mayo.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 22-JUN-10 18:16:00 to 22-JUN-10 18:16:00 (EST-5)
Location: HAREWOOD PARK
Magnitude: 52.00 EG
Reported by: Public

A thunderstorm wind gust was estimated to be around 60 mph.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:05:00 to 22-JUN-10 19:05:00 (EST-5)
Location: MARYLAND CITY
Magnitude: 52.00 EG
Property damage: 3.00K
Reported by: Fire Department/Rescue

Trees and power lines were down in the Laurel area.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:57:00 to 22-JUN-10 19:57:00 (EST-5)
Location: SELBY BEACH
Magnitude: 57.00 EG
Property damage: 3.00K
Reported by: Public

Large trees were down due to thunderstorm winds.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-10 18:23:00 to 22-JUN-10 18:23:00 (EST-5)
Location: QUINCE ORCHARD
Magnitude: 50.00 EG
Reported by: Mesonet

A wind gust of 58 mph was reported at Quince Orchard High School.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-10 18:43:00 to 22-JUN-10 18:43:00 (EST-5)
Location: BRINKLOW
Magnitude: 52.00 EG
Reported by: Public

A wind gust from a thunderstorm was estimated to be around 60 mph near Brinklow.

Thunderstorm Wind in CHARLES, MARYLAND
From 22-JUN-10 19:06:00 to 22-JUN-10 19:06:00 (EST-5)
Location: PISGAH
Magnitude: 57.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

Tree damage was reported across western portions of Charles County.

Thunderstorm Wind in CHARLES, MARYLAND
From 22-JUN-10 19:15:00 to 22-JUN-10 19:15:00 (EST-5)
Location: POMFRET
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Fire Department/Rescue

Several tree limbs ranging between 4.5 and 6.0 inches in diameter were down due to thunderstorm winds.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:14:00 to 22-JUN-10 19:20:00 (EST-5)
Location: PIONEER CITY
Magnitude: 62.00 EG
Property damage: 5.00K
Reported by: Fire Department/Rescue

Numerous trees were down in the Severn and Jessup areas.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:30:00 to 22-JUN-10 19:30:00 (EST-5)
Location: EARLEIGH HGTS
Magnitude: 70.00 EG
Property damage: 5.00K
Reported by: Fire Department/Rescue

Full grown pine oak trees were snapped in half.

Thunderstorm Wind in CHARLES, MARYLAND
From 22-JUN-10 19:26:00 to 22-JUN-10 19:26:00 (EST-5)
Location: WALDORF
Magnitude: 57.00 EG
Property damage: 10.00K
Reported by: Fire Department/Rescue

Trees were down across the county. Most of the damage was focused near Waldorf.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 22-JUN-10 19:32:00 to 22-JUN-10 19:32:00 (EST-5)
Location: SURRATS GARDENS
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Several pear tree limbs six to twelve inches in diameter were knocked down.

Thunderstorm Wind in HOWARD, MARYLAND
From 22-JUN-10 19:05:00 to 22-JUN-10 19:05:00 (EST-5)
Location: JESSUP
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

Three trees fifteen inches in diameter were blown down in thunderstorm winds.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-10 18:40:00 to 22-JUN-10 18:40:00 (EST-5)
Location: REDLAND
Magnitude: 62.00 EG
Reported by: Public

A wind gust from a thunderstorm was estimated to be around 70 mph near Olney.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:53:00 to 22-JUN-10 19:53:00 (EST-5)
Location: EDGEWATER
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Newspaper

Trees were down near Edgewater.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-10 18:38:00 to 22-JUN-10 18:38:00 (EST-5)
Location: MT ZION
Magnitude: 52.00 EG
Property damage: 3.00K
Reported by: Fire Department/Rescue

Several large trees were down between Laytonsville and Olney.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 22-JUN-10 19:34:00 to 22-JUN-10 19:34:00 (EST-5)
Location: EARLEIGH HGTS
Magnitude: 56.00 EG
Reported by: Trained Spotter

A spotter estimated straight line wind gusts around 65 mph.