2013: Severe thunderstorms developed in the San Diego mountains and deserts.
Quarter size hail fell on Ranchita, Moreno Valley and Pine Valley.
Downburst winds hit Borrego Springs with measured gusts off 64 mph that downed a string of power lines.
A large mud and debris flow forced a closure of the S2 near the Highway 79 Junction.
2006: Moisture from the remnants of Hurricane John brought thunderstorms to the mountains, deserts, and Inland Empire.
Heavy thunderstorms occurred along the Elsinore Convergence Zone near Hemet.
Roads closed in Hemet, cars were stalled, a mudslide along Hwy. 74.
The thunderstorms also produced strong winds estimated at 70 mph. Damage was done to trees, buildings, and power lines from San Jacinto to Temecula.
There was also extensive damage to local wineries.
1998: Truckee recorded 1.63" of precipitation.
1997: The Thornton Fire in the Sequoia National Forest caused by a lightning strike approximately 5 miles southeast of Lake Isabella burned 150 acres.
1995: A very strong thunderstorm caused damage to more than 250 homes in Lake Havasu City, AZ, several extensively.
Roofs were ripped off and air conditioners at three homes were blown to the ground.
Winds overturned some boats with a few of them crashing into the street.
Winds also knocked down power lines.
Torrential rains caused washes to run very high.
1978: Hurricane Norman recurved with the remnants tracking into southern California from the south southwest.
Rainfall exceeded 3" in the mountains on 9.5 and on this day.
This occurred during the El Nino of 1977-78.
1976: Five tornadoes were reported around El Mirage, west of Victorville, and one near Mt. Baldy during a period that started on 9.4 and ended on this day.
Property damage resulted.
1972: Hurricane Hyacinth moved as far west as 125 west longitude, the farthest west in tropical cyclone history, before recurving to the northeast.
She made landfall as a tropical depression in northern San Diego County with winds of 25 mph and rainfall of up to 1" in the mountains from 8/29 to this day.
This occurred during the El Niño of 1972-73.
Only 0.44" was measured in San Diego.
Flash flooding on 9/3 resulted in closing Interstate 40 at Ludlow, east of Barstow, for two hours.
Railroads were damaged as well.
1969: A nearly stationary thunderstorm lasted from the 6th into the 7th of September.
Fresno received 0.04" on the 6th, setting a daily precipitation record.
One boy was killed by lightning in Fresno.
Power transformers were shorted out.
1967: A heavy thunderstorm struck the west Barstow area.
Flash floods hit a neighborhood in west Barstow.
Some homes and yards were filled with up to three feet of mud.
1955: A prolonged heat wave started on 8.31 and ended on 9.7. It was 110° F in LA on 9.1, an all time record. In Riverside it was 114° F on this day and in Escondido it was 111° F, each the highest temperature on record for September.
In Escondido, this was the highest temperature on record for more than 50 years until it was broken on 7.22.2006 with a temperature of 112°.
1944: The high temperature at Reno, NV was 96° F.
1939: The remnants of a hurricane tracked northeastward across northern Baja California into southwest Arizona starting on 9.4 and ending on this day.
Up to 7" of rain fell on the mountains and deserts.
Blythe received more rain than would normally fall in a year and Imperial received more rain than would normally fall in two years.
Four tropical cyclones would impact Southern California during the month of September 1939, an unprecedented occurrence.
1.21" fell in San Diego.
Floods through eastern canyons inundated Thermal with three feet of water.
Extensive damage occurred in Mecca.
1939: The remnants from the first of three tropical cyclones to affect the southwestern United States in one month brought 1.1" to Las Vegas, NV, from the 4th through the 6th.
1936: Santa Cruz had a high of 98° F.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego
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