A long north to south oriented line of thunderstorms developed during the early afternoon  hours on September 8th; it ran from the Baja spine northward through central Imperial County and into eastern Riverside County. The individual storms moved rather quickly to the north and most of the storms in the line were very strong, producing gusty damaging microburst winds along with intense rainfall which led to multiple episodes of flash flooding. Much of the damage and flooding occurred from the Imperial Valley south to the Mexican border. For example, just north of the Mexican border and east of Calexico, 23 power poles were downed on Carr Road. Further north, in the town of Calipatria, 23 power poles were downed on Young Road at about 1300PST. Flash flooding occurred in the vicinity of the town of Holtville; about 4 miles west of town a canal was breached resulting in the flooding of nearby homes. Multiple Flash Flood and Severe Thunderstorm Warnings were issued during the afternoon.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:00:00 to 08-SEP-17 13:00:00 (PST-8)
Location: CALEXICO
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Very strong thunderstorms developed across the higher terrain of northern Baja during the early afternoon hours, and then moved north into south-central Imperial County. Some of the storms generated gusty and damaging microburst winds estimated to be as high as 70 mph. According to a local emergency manager, at 1300PST gusty winds blew down 20 to 23 power poles along Carr Road, approximately 4 miles east of the town of Calexico and just north of the Mexican border. This caused the road to become closed from California Highway 7 to Barbara Worth Road.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:00:00 to 08-SEP-17 13:00:00 (PST-8)
Location: MELOLAND
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with gusty damaging winds developed across the central portion of Imperial County during the early afternoon hours on September 8th and some of the stronger storms affected the Imperial Valley including the area around the town of Holtville. At 1300PST, gusty winds estimated to be at least 60 mph blew down a tree near the intersection of Barbara Worth Road and Interstate 8. The downed tree was about 4 miles southwest of the town of Holtville. This was reported by the California Highway Patrol.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:00:00 to 08-SEP-17 13:00:00 (PST-8)
Location: CALIPATRIA
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms developed across the central portion of Imperial County during the early afternoon hours and they moved quickly to the north, producing strong gusty and damaging outflow winds which impacted portions of the Imperial Valley as well as the town of Calipatria. According to local emergency managers, at 1300PST gusty microburst winds estimated to be as high as 70 mph blew down 23 power poles in the town of Calipatria. The poles were downed on Young Road, near Highway 111. No injuries were reported due to the downed poles.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:40:00 to 08-SEP-17 13:40:00 (PST-8)
Location: NILAND
Magnitude: 56.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Scattered thunderstorms developed across portions of central Imperial County during the afternoon hours on September 8th, and some of the stronger storms produced gusty and damaging outflow winds which impacted the town of Niland located to the north of the Imperial Valley. At 1340PST a local emergency manager reported that gusty winds estimated to be as high as 65 mph blew down 5 power poles. The downed poles were located along Highway 111 in Niland. Power in town was reported to be out due to the downed poles. A Severe Thunderstorm Warning was in effect at the time of the damage; it was issued at 1323PST.

Flash Flood in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:15:00 to 08-SEP-17 16:00:00 (PST-8)
Location: CALEXICO
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A line of thunderstorms developed across central Imperial County during the early afternoon hours and some of the stronger storms produced very heavy rainfall which impacted areas from the Imperial Valley south to the Mexican Border. Peak rain rates were in excess of 2 inches per hour and led to episodes of flash flooding. At 1339PST a local emergency manager reported significant flooding on California Highway 98 to the east of Calexico and west of Highway 7. A Flash Flood Warning was in effect at the time of the flooding; it was issued at 1316PST and remained in effect through 1600PST.

Flash Flood in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:30:00 to 08-SEP-17 16:00:00 (PST-8)
Location: MELOLAND
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Scattered to numerous thunderstorms developed across the central portion of Imperial County during the afternoon hours on September 8th, and some of the stronger storms produced very heavy rainfall with peak rain rates in excess of 2 inches per hour. The intense rain led to episodes of flash flooding in the Imperial Valley, including the town of Holtville. According to a local emergency manager, heavy rain caused excessive flow in area canals, and one canal was breached near the intersection of Meloland and Evan Hewes roads. As the canal breached, flash flooding occurred which inundated nearby homes. The flooded homes were located about 4 miles west of Holtville. A Flash Flood Warning was in effect at the time of the flooding. No injuries were reported.

Flash Flood in IMPERIAL, CALIFORNIA
From 08-SEP-17 13:15:00 to 08-SEP-17 16:00:00 (PST-8)
Location: DATE CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Scattered to numerous thunderstorms developed across the central portion of Imperial County during the afternoon hours and some of the storms produced very heavy rainfall with peak rain rates in excess of 2 inches per hour. The intense rains led to episodes of flash flooding, some of which affected the Imperial Valley and areas around the town of Holtville. According to the California Highway Patrol, at 1358PST, flash flooding occurred about 2 miles southeast of Holtville, to the northeast of Bonds Corner Road. No injuries were reported. A Flash Flood Warning was in effect at the time of the flooding.