2017: A strong upper level ridge of high pressure over the Great Basin and weak offshore flow brought a heat wave, particularly west of the mountains, from 9/1 to this day.
Highest temperatures during this three-day span was 114° F in Ontario and Chino, 112° F in Riverside, 109° F in Ramona, 108° F in Fallbrook, 106° F in Fullerton and El Cajon.
Severe thunderstorms brought damaging winds and flash flooding.
In Santa Barbara, a thunderstorm microburst generated 80-mphwind gusts which resulted in significant damage in the city as well as the harbor.
One girl was injured.
In the Antelope Valley, severe thunderstorm wind gusts up to 61 MPH were reported.
2017: A northwest surge of tropical moisture during the Labor Day weekend produced strong thunderstorms over the Kern County Mountains during the late afternoon of September 3.
These thunderstorms produced heavy rain which caused flash flooding in the Frazier Park and Pine Mountain Club areas.
The thunderstorms spread northward through the San Joaquin Valley along an outflow boundary which also produced wind gusts between 40 and 50 mph and blowing dust which reduced visibility to near zero.
State Route 99 was closed in both directions for about an hour due to power poles downed by thunderstorm wind gusts and a mud slide onto the road near Panama Lane in Bakersfield.
Power poles and power lines near Interstate 5 just south of Stockdale Highway 1 mile SE of Buttonwillow were reported downed by wind gusts which caused brush fires.
Power lines were downed across Stockdale Highway west of Rosedale from strong thunderstorm winds.
Power lines were downed by thunderstorm winds across the northbound lanes of State Route 184 near Sunset Blvd 3 miles south of Lamont.
Social Media that showed a building under construction damaged by thunderstorm wind gusts near State Route 99 and Berkshire Rd. in Bakersfield.
There was a mud slide and road flooding due to heavy rainfall on southbound State Route 99 just north of White Ln. in Bakersfield.
There was also a mud slide in the right lane of State Route 99 at Ming Ave. to State Route 58 in Bakersfield.
A family of three were struck by lightning and injured while wilderness backpacking at Sequoia National Park.
2013: Strong thunderstorms over the San Jacinto Mountains dropped heavy rain that led to flash flooding in Palm Canyon Creek and Tahquitz Creek.
The flood in Tahquitz Creek carried large amounts of mud and debris, which it deposited on the course at Tahquitz Creek Golf Resort.
Additional storms over Pine Cove blanketed the ground with half-inch hail and sent 2"-3" of water and hail rushing over Highway 243.
2007: A damaging wind gust of 83 mph, in association with a severe thunderstorm, was report at the Mojave Spaceport with data from the Edwards Weather System wind tower.
Local law enforcement reported Highway 14 flooded in both directions near the intersection of California City Blvd.
Flooding was also occurring around the Mojave Airport.
2007: A heat wave began on 9.1 and ended on this day, with a monsoon flavor.
Temperatures exceeded 95° F in the coasts and the mountains, 105° F in the valleys, 110° F in the Inland Empire and high deserts, and 115° F in the lower deserts.
At least six deaths from heat related illnesses.
2006: A microburst hit northeast of Sun City (Temecula Valley).
Power lines and poles were knocked down.
Power outages resulted.
2004: The Bear Fire 5 miles south of Mariposa burned 416 acres and 5 structures (damage figure estimated).
The cost to suppress this human origin fire was $1.4M.
No fatalities or injuries occurred.
2003: A large amount of convective activity developed in the Kern Desert areas late in the afternoon of the 2nd.
Spotter reports indicated at least a couple of microbursts in and around Edwards AFB just before 5 PM PST as some minor damage was reported in Rosamond and strong, gusty winds occurred later at meso-net sites northwest and north of Edwards.
Nearly 50 lightning strikes were reported as thunderstorm activity moved from the Kern Deserts into the Kern Mountains and Tulare County Mountains by late evening.
Over 14 fires were started by lightning strikes on the 2nd and 3rd of September in the Sequoia-Kings National Park area of the Tulare County Mountains.
The Cargyle Complex Fire was ignited by lightning and allowed to burn through the month for resource benefits. By the end of the month it had burned 717 acres at a cost of $64K.
2003: Thunderstorms developed in the mountains and deserts of Southern California starting on 9.2 and ending on this day.
Rain rates of more than one inch per hour occurred with many of the storms.
Roadways were flooded in the Lake Henshaw area, Palm Canyon near Palm Springs, Yucca Valley, Idyllwild, Santa Ysabel, Mt. Laguna and Borrego Springs.
2001: Thunderstorms developed in the mountains each day starting on 9.2 and ending on this day.
The moisture came from the remnants of Hurricane Flossie.
2.1" of rain fell in one hour at Lake Cuyamaca, causing flash floods and mud slides.
Flash floods and mud slides also occurred in the San Bernardino Mountains.
One boy was killed by lightning in Apple Valley.
One man was killed and one boy was injured by lightning at Cuyamaca Rancho State Park.
Trees fell on a house in Beaumont.
Hail up to 0.5" in diameter was measured at Pine Valley.
1997: Monsoonal moisture over the Southwest United States by the late afternoon/early evening of Wednesday, September 3rd, supported thunderstorm activity over the desert portions of Kern County and the northern Kern County Mountains.
One particularly large cell moved from southwest to northeast up the El Paso Mountains and produced heavy rain reaching 4.5" in a little over an hour and resulted in 28,000 CFS of flash flood flow down Red Rock Creek through Red Rock Canyon State Park and on into Koehn Dry Lake damaging several bridges along State Highway 14.
Nearly 100 motorists were stranded by the flooding with 4 cars swept into the water.
Reports indicated that a 12-foot wall of water swept over Highway 14 at 7:10 PM PDT and subsequently over Redrock-Randsburg Road at 7:17 PM PDT. There were no fatalities.
While not reaching severe wind threshold levels...the Cantil thunderstorm produced a gusty front of 40 knots over the California City Airport 12 miles away at 17:30PST.
No damage was reported.
An additional gust front from the Mojave area thunderstorm produced a gust front of 42 knots over the Mojave Airport at 18:00 PST.
Again, no damage was reported from this cell due to its winds.
A thunderstorm passage through the East Lake Isabella area of Kern County brought enough rainfall to generage water flow over State Highway 178 at Onyx from Scodie Creek.
Hail was also reported with this thunderstorm up to 1/2" in diameter.
1997: A second day of heavy rain producing thunderstorms lead to more flash flooding in the Pahrump Valley.
At 11:35 am PST, the Nevada Highway Patrol reported a wall of water crossing State Route 160 near mile marker four.
The road remained closed for several hours.
At 12:32 pm PST, the Pahrump Fire Department reported a number of roads flooded and barricaded in and around Pahrump.
By 1:40 pm PST, a state of emergency had been declared for Pahrump due to numerous road closures and damage caused by the flooding.
Damage was estimated at $2.7 million.
Heavy rain triggered mud slides in Kyle Canyon which deposited debris on State Route 157 (west of Las Vegas near CA-NV border). A report was also received of mud and debris on Wheeler Pass Road in the Spring Mountains. Equipment was dispatched to clear the roads.
The Nevada Division of Forestry reported about 2" of rain in Kyle Canyon between 7 am and noon PST.
1988: The high temperature at Reno, NV, was 100° F .
It was one of nearly 1,000 lightning-caused fires burning across the state.
1986: Mount Hamilton (East Bay) had a high of 98° F -- a record for the month.
1972: Hurricane Hyacinth moved as far west as 125 West before recurving to the northeast.
The remnants made landfall between Los Angeles and San Diego on 9/3 with winds of 25 mph and rainfall from 8/29 to 9/6.
Beaumont received 1.52" and Idyllwild measured 1.26".
Only 0.44" was measured in San Diego.
This tropical cyclone holds the distinction of traveling the farthest west before recurving and making landfall in Southern California, which it did as a tropical depression.
This occurred during the El Niño of 1972-73.
On this day flash flooding resulted in closing Interstate 40 at Ludlow, east of Barstow, for two hours.
Railroads were damaged as well.
1955: The high temperature at Sierraville (Sierra Co.) was 100° F.
1955: Fresno had a high of 111° F, tying the record high for the month last set on September 11, 1888.
Bakersfield set it's all-time record high for the month of September, 112° F.
1950: It was 109° F in Victorville, the highest temperature on record for September.
1950: Carson City, NV, had a high temperature of 103° F.
1923: It was 40° F in Santa Ana, the lowest temperature on record for September.
This also occurred on 9.9.1917 and on 9.26.1948.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego & Redding Record-Searchlight
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