An approaching broad upper low east of the Four Corners region placed eastern Texas in a favorable upper air pattern conducive to sustaining either a mesoscale storm complex or an organized linear storm system. Daytime heating, within a highly moist environment and a passing shortwave disturbance, allowed a south central Texas originating derecho to pass through within the southwest flow and cause severe weather damage across the Houston, Texas area.

Thunderstorm Wind in HARRIS, TEXAS
From 17-APR-15 19:45:00 to 17-APR-15 19:45:00 (CST-6)
Location: OLCOTT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

A billboard was downed onto an SUV.

Thunderstorm Wind in HARRIS, TEXAS
From 17-APR-15 19:48:00 to 17-APR-15 19:48:00 (CST-6)
Location: CLEAR LAKE CITY
Magnitude: 71.00 MG
Property damage: 0.00K
Crop damage: 15.00K
Reported by: NWS Employee

Johnson Space Center recorded this wind gust from an anemometer on the top of a building 152 feet above the ground. This speed is an estimated 65 mph gust at the surface. Many small trees and tree limbs were snapped and blown down across a large part of the JSC complex.

Thunderstorm Wind in MATAGORDA, TEXAS
From 17-APR-15 18:05:00 to 17-APR-15 18:05:00 (CST-6)
Location: CLEMVILLE
Magnitude: 50.00 EG
Reported by: Law Enforcement

Thunderstorm winds damaged a barn, an air conditioning window unit, and a pump house.  There were also numerous trees downed in the yard.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 19:00:00 to 17-APR-15 19:00:00 (CST-6)
Location: ANGLETON
Magnitude: 60.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed several trees and numerous tree limbs throughout the city.

Flash Flood in WHARTON, TEXAS
From 17-APR-15 13:00:00 to 17-APR-15 17:00:00 (CST-6)
Location: HUNGERFORD
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

County Road 215 was impassable due to flood waters.

Thunderstorm Wind in JACKSON, TEXAS
From 17-APR-15 16:58:00 to 17-APR-15 16:58:00 (CST-6)
Location: MORALES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Law Enforcement

Wind gusts estimated at 50 to 60 mph downed trees on FM 283 near Morales.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 18:55:00 to 17-APR-15 18:55:00 (CST-6)
Location: LAKE JACKSON
Magnitude: 60.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed several trees and many tree limbs.

Hail in BRAZORIA, TEXAS
From 17-APR-15 18:57:00 to 17-APR-15 18:57:00 (CST-6)
Location: ANCHOR
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Two inch hail observed to the west of Danbury along SH 288.

Thunderstorm Wind in GALVESTON, TEXAS
From 17-APR-15 19:10:00 to 17-APR-15 19:10:00 (CST-6)
Location: JAMAICA BEACH
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew a roof off a home.

Thunderstorm Wind in HARRIS, TEXAS
From 17-APR-15 19:40:00 to 17-APR-15 19:40:00 (CST-6)
Location: HOUSTON CLOVER ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts were estimated to be at least 60 mph with sustained speeds between 45 and 50 mph.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 20:01:00 to 17-APR-15 20:01:00 (CST-6)
Location: MIMS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The wind gust was measured at the Brazoria National Wildlife Refuge by a RAWS sensor.

Thunderstorm Wind in WHARTON, TEXAS
From 17-APR-15 17:18:00 to 17-APR-15 17:18:00 (CST-6)
Location: EL CAMPO
Magnitude: 52.00 EG
Reported by: Emergency Manager

Thunderstorm winds downed a tree in El Campo.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 18:53:00 to 17-APR-15 18:53:00 (CST-6)
Location: WEST COLUMBIA
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm winds downed six power lines along Highway 35.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 18:50:00 to 17-APR-15 18:50:00 (CST-6)
Location: ANGLETON BAILES ARPT
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds collapsed a circus tent at the Angleton Fairgrounds.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 18:54:00 to 17-APR-15 18:54:00 (CST-6)
Location: BRAZORIA
Magnitude: 60.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed a tree and destroyed much of a two story house.  A tree also fell on the American Legion Pavilion.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 19:15:00 to 17-APR-15 19:15:00 (CST-6)
Location: MANVEL
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed tree limbs and power lines.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 19:15:00 to 17-APR-15 19:15:00 (CST-6)
Location: ALVIN
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed a couple of trees.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 19:05:00 to 17-APR-15 19:05:00 (CST-6)
Location: IOWA COLONY
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm wind gusts estimated around 72 mph were observed.

Thunderstorm Wind in HARRIS, TEXAS
From 17-APR-15 19:30:00 to 17-APR-15 19:30:00 (CST-6)
Location: CLEAR LAKE CITY
Magnitude: 60.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed a large tree and numerous tree limbs.

Hail in BRAZORIA, TEXAS
From 17-APR-15 18:40:00 to 17-APR-15 18:40:00 (CST-6)
Location: ANGLETON
Magnitude: 2.50 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Egg to tennis ball sized hail was reported in Angleton.

Hail in BRAZORIA, TEXAS
From 17-APR-15 18:48:00 to 17-APR-15 18:48:00 (CST-6)
Location: OYSTER CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter sized hail was reported at Landers Road.

Hail in BRAZORIA, TEXAS
From 17-APR-15 19:00:00 to 17-APR-15 19:00:00 (CST-6)
Location: ANGLETON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter sized hail was observed in the Angleton area.

Hail in BRAZORIA, TEXAS
From 17-APR-15 18:55:00 to 17-APR-15 18:55:00 (CST-6)
Location: LAKE JACKSON ARPT
Magnitude: 1.50 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ping pong sized hail was observed in the Lake Jackson area.

Flash Flood in HARRIS, TEXAS
From 17-APR-15 17:00:00 to 17-APR-15 22:30:00 (CST-6)
Location: LA PORTE
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Public

There were numerous reports of flooded roadways and stranded vehicles in high water in and around the city of Houston, Bellaire, Pasadena, La Porte and the Clear Lake/Webster areas. There were fire department high water rescues over the southeastern sector of the county. Impassable roads due to high flood waters include, but are not limited to, South Shepard Street, West Alabama Street, Westheimer Street, Bellaire Blvd, Spur 527 off of Highway 59, Scarsdale Blvd in Pasadena and southbound feeder roads of I-45 around Hobby Airport. There was water in a home off of Scarsdale Blvd in Pasadena. There were approximately 40 flooded homes in the town of La Porte.

Hail in BRAZORIA, TEXAS
From 17-APR-15 19:05:00 to 17-APR-15 19:05:00 (CST-6)
Location: IOWA COLONY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter sized hail was observed south of Iowa Colony.

Hail in BRAZORIA, TEXAS
From 17-APR-15 18:50:00 to 17-APR-15 18:50:00 (CST-6)
Location: ANGLETON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

There were multiple reports of quarter sized hail in and around the Angleton area.

Thunderstorm Wind in BRAZORIA, TEXAS
From 17-APR-15 18:57:00 to 17-APR-15 18:57:00 (CST-6)
Location: ANCHOR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds gusted up to 70 mph.

Flash Flood in BRAZORIA, TEXAS
From 17-APR-15 18:30:00 to 17-APR-15 20:30:00 (CST-6)
Location: ROSS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Street flooding in the town of Richwood.

Flash Flood in GALVESTON, TEXAS
From 17-APR-15 19:00:00 to 17-APR-15 20:00:00 (CST-6)
Location: LEAGUE CITY S S ARPT
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

Flooded roadways due to high rainfall around Friendswood High School.

Flash Flood in BRAZORIA, TEXAS
From 17-APR-15 19:00:00 to 17-APR-15 20:30:00 (CST-6)
Location: PEARLAND
Flood cause: Heavy Rain
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused localized street flooding within the town of Pearland.

Thunderstorm Wind in FORT BEND, TEXAS
From 17-APR-15 21:30:00 to 17-APR-15 21:30:00 (CST-6)
Location: STAFFORD
Magnitude: 50.00 EG
Reported by: Emergency Manager

There were reports of damaged fences and to a home that was under construction within the Promenade subdivision.

Thunderstorm Wind in HARRIS, TEXAS
From 17-APR-15 19:29:00 to 17-APR-15 19:29:00 (CST-6)
Location: (HOU)HOBBY ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind gusts was measured at Houston Hobby Airport.