Thunderstorms developed during the afternoon hours across portions of Imperial county, affecting locations from Calexico northward to the Salton Sea. Due to the very moist and unstable nature of the atmosphere, the storms produced a variety of weather including strong and damaging outflow winds, dense blowing dust and heavy rain. The heavy rain led to flash flooding near the intersection of Highway 86 and Highway 78 to the southwest of the Salton Sea. A variety of weather products were issued during the afternoon hours, including Severe Thunderstorm Warnings and Flash Flood Warnings.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 07-SEP-13 15:40:00 to 07-SEP-13 15:47:00 (PST-8)
Location: CALEXICO
Magnitude: 65.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorms developed over the higher terrain of northwestern Mexico during the afternoon hours on September 7th, and they generated very strong and damaging outflow winds which spread north and into the community of Calexico. According to a trained weather spotter about 1 mile west of Calexico, gusty outflow winds estimated to be at least 75 mph in strength blew down numerous trees and cause some damage to roofs in the area. Street flooding was also reported. No injuries were reported as a result of the strong winds.

Flash Flood in IMPERIAL, CALIFORNIA
From 07-SEP-13 16:00:00 to 07-SEP-13 19:00:00 (PST-8)
Location: SALTON CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms developed across far west central portions of Imperial county during the afternoon hours on September 7th, and they affected areas to the west of the Salton Sea. Due to the very moist and unstable nature of the atmosphere, the storms produced very heavy rain, with rain rates in excess of 2 inches per hour at times. The heavy rain led to flash flooding to the west of the Salton Sea, affecting motorists on Highway 86 southeast of Winona. According to local law enforcement, flooding was reported along Highway 86 just 1/2 mile north of the junction with Highway 78. The flooding closed one of the southbound lanes leading to very slow traffic movement. A Flash Flood Warning was issued for west central Imperial county at 1556PST and it remained in effect until 1900PST. No accidents or injuries were reported due to the flash flooding.

Dust Storm in IMPERIAL COUNTY EXCEPT THE LOWER COLORADO RIVER VALLEY, CALIFORNIA
From 07-SEP-13 16:30:00 to 07-SEP-13 18:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across northwest Mexico during the afternoon hours on September 7th and they generated strong gusty outflow winds in excess of 60 mph. The strong outflow winds then spread to the north and into communities such as Calexico and Heber. The winds picked up considerable amounts of dust and sand and created dust storm conditions with visibilities at or below 1/4 of a mile. A Dust Storm Warning was issued for southwest Imperial county, including the community of Heber, beginning at 1628PST and continuing through 1800PST. At 1645 PST, a trained weather spotter 1 mile west of Heber reported less than 1/4 mile visibility in a dust storm. Fortunately, no accidents or injuries were reported due to the dense blowing dust.