A line of thunderstorms developed across south central Imperial county during the early afternoon hours on August 21st and they affected communities such as Imperial and El Centro. The stronger storms produced damaging microburst winds estimated to be in excess of 60 mph. The peak thunderstorm wind gusts were sufficient to blow down numerous power poles as well as overturn semi-trailer trucks on area highways such as Interstate 8. In addition to the strong winds, some storms produced large hail as well as locally heavy rainfall. The heavy rainfall led to episodes of both flash flooding and flooding which covered much of central and eastern Imperial county. Numerous roads were closed during the afternoon and evening hours due to the flooding.  No injuries were reported due to the strong winds or flooding.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 21-AUG-14 13:00:00 to 21-AUG-14 13:40:00 (PST-8)
Location: (IPL)IMPERIAL CO ARP
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across portions of Imperial county, and they affected the communities of El Centro and Imperial as well as truckers along Interstate 8. Some of the storms produced gusty and damaging microburst winds, with peak gusts estimated to be nearly 70mph. According to a trained weather spotter about 3 miles to the east of the Imperial airport, gusty microburst winds downed multiple telephone poles along highway 111 near Worthington Road. The winds also overturned a semi-trailer truck on the road; emergency crews later responded to the scene. Additionally, the California Highway Patrol reported a second large semi-trailer that was overturned on westbound Interstate 8 east of Highway 98. A third big rig was overturned on eastbound Interstate 8 near Peg Leg Hill near Winterhaven at 1340PST. Fortunately, no injuries were reported.

Thunderstorm Wind in IMPERIAL, CALIFORNIA
From 21-AUG-14 14:30:00 to 21-AUG-14 14:35:00 (PST-8)
Location: PALO VERDE
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across the eastern portion of Imperial county during the afternoon hours on August 21st, and some of the stronger storms produced gusty and damaging microburst winds estimated to be in excess of 60 mph. Some of the storms affected the community of Palo Verde, as well as motorists driving on highway 78. According to a trained weather spotter in Palo Verde, gusty microburst winds estimated to be nearly 65 mph caused trees to be snapped and downed at a local residence. The winds also generated thick blowing dust shortly before the heavy rains came. The strong winds also caused the power to go out.

Hail in IMPERIAL, CALIFORNIA
From 21-AUG-14 12:45:00 to 21-AUG-14 12:45:00 (PST-8)
Location: EL CENTRO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms developed across portions of south central Imperial county during the early afternoon hours on August 21st and they affected the communities of El Centro and Imperial. The stronger storms produced large hail in addition to gusty microburst winds. According to the California Highway Patrol, a strong thunderstorm in El Centro produced dime-sized hail, or hail with a diameter of 0.75 inches. The large hail did not appear to cause damage.

Heavy Rain in IMPERIAL, CALIFORNIA
From 21-AUG-14 12:00:00 to 21-AUG-14 15:00:00 (PST-8)
Location: (IPL)IMPERIAL CO ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorms developed across portions of south central Imperial county during the afternoon hours on August 21st, and some of them affected the communities of Imperial and El Centro. The stronger storms produced locally heavy rain with rain rates approaching 2 inches per hour. The storms led to significant urban flooding as well as the issuance of Flash Flood Warnings. According to the Imperial ASOS precipitation sensor, at 1238PST 1.15 inches of rain was measured within a 35 minute period. At 1327PST, the Department of Highways reported roadway flooding at the intersection of Ralph Road and Dogwood Road about 2 miles northeast of Imperial.

Flood in IMPERIAL, CALIFORNIA
From 21-AUG-14 16:00:00 to 21-AUG-14 21:00:00 (PST-8)
Location: WESTMORELAND
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Department of Highways

Scattered to numerous showers and thunderstorms developed across much of Imperial county during the afternoon hours, and they persisted into the evening on August 21st. The storms produced locally heavy rainfall with peak rain rates well in excess of one inch per hour. Initially the rains led to some flash flooding, however as the afternoon progressed the rain rates let up somewhat. However, many roads across the county became inundated and impassable. Multiple roads were closed across the Imperial Valley, which affected communities such as Brawley, Imperial, El Centro and Glamis. Roads affected included Ogilby Road, Worthington Road, Highway 78 east of Brawley, and old Highway 111. An Areal Flood Warning was issued for much of central Imperial county at 1711PST, which remained in effect through 2000PST. No injuries were reported due to the flooding.