2018: A low pressure system centered over southern Nevada provided for a shallow surge of mid-level moisture into central California on September 3 and 4.
During the afternoon of the 4th, several thunderstorms developed over the higher elevations of the Southern Sierra Nevada from Yosemite National Park southward to the Lake Isabella area where the atmosphere was unstable. Heavy rainfall was produced by thunderstorms near Kings Canyon and near Lake Isabella which over an inch of rainfall between 100 pm PDT and 5 pm PDT.
In addition, isolated thunderstorms brought some light rainfall to the southern Sierra foothills and to the Kern County Deserts.
A slow moving thunderstorm produced 1.07" of rainfall at Lake Isabella between 330 pm PDT and 430 pm PDT.
2012: Violent monsoonal thunderstorms slammed into various localities on the Mojave Desert.
60-80 mph wind gusts completely tore off the roof of the Needles Movie Theater at West Broadway and F Street and separated a roof from a house elsewhere in Needles and downed 3 power poles
Also in Needles, several large pine trees and several power poles were blown down by the same gust front.
East of Twentynine Palms flashflooding on Highway 62 at mile marker 40 entrapped vehicles.
2011: The Canyon wildfire was caused by lightning and occurred on 9/4/11 at 1132 PDT.
The location was 5 miles Southeast of Tehachapi in Kern County. The size was 14,585 acres.
Containment was reached on 9/10/11.
There were no fatalities.
There were 32 primary structures lost and 68 outbuildings.
The cost to containment was $10 million.
2009: Strong thunderstorms roll through far western areas of Mohave County (NW-most county in AZ adjacent to CA & NV border region) in late evening destroying 20 RV/Motor Homes and sending 2 people to the hospital in Mohave Valley.
Several sheds were destroyed and roofs torn off homes in Golden Valley where winds were measured at 67 mph. Golf ball sized hail was also reported in Golden Valley.
2007: Showers and thunderstorms developed during the afternoon hours (Yuma, AZ, area), resulting in very heavy rainfall and local flooding.
In addition, gusty winds associated with these storms affected portions of Imperial County.
2006: A thunderstorm dropped heavy rain along the Elsinore Convergence Zone.
Significant mudslides (debris flows) occurred in north San Jacinto, trapping 19 vehicles.
A few homes and businesses were also damaged.
2003: Strong thunderstorms produced 1.75" hail in Joshua Tree and Twentynine Palms.
0.75" hail fell in the Julian area.
A tornado in Joshua Tree and Yucca Valley caused extensive damage ($25,000) to one residence and minor damage to 11 other residences (no injuries).
2002: Large swell from former Category 5 Hurricane Hernan arrive along the beaches of SoCal.
The trajectory of the swell favored Orange County beaches, and surf heights surged to 12-20 ft.
2001: The Tar Fire located 2 mi. west of Silver City (Tulare Co.) was ignited by lightning near Atwell Grove.
The fire burned 505 acres and was managed as a resource benefit throughout the remainder of the month of September.
There were no fatalities, injuries, or structures lost.
1998: Sub-tropical moisture had provided high humidities in combination with much above normal temperatures for the San Joaquin Valley for the first three (3) days in September.
The remnants of East Pacific Hurricane Isis sheared northeastward from the Gulf of California by September 3rd but due to the southeast flow aloft around a weak low circulation off the Southern California Coast, the moisture was brought back to the northwest over the NWS San Joaquin Valley CWFA.
With the moist sub-tropical airmass, steady rain with some embedded thunderstorms brought rainfall to the seasonally dry San Joaquin Valley. Agriculture, especially vintners and raisin growers, took monetary loss either directly due to rain or indirectly due to the additional steps to treat the increase in fungus activity on produce.
While not "heavy" but "infrequent", this rain led Bakersfield to a one-day rainfall record on September4th with 0.27" in 24-hours (old mark of 0.17" set in 1963).
1997: Hurricane Linda became the strongest storm recorded in the eastern Pacific with winds estimated at 180 mph and gusts to 218 mph.
For a time it threatened to come ashore in California as a tropical storm, but the storm turned away, impacting the region with added moisture for showers and thunderstorms. This occurred during the strong El Nino of 1997-98.
2.5" per hour rain rates and golf ball size hail were recorded at Forest Falls.
Disastrous flooding and debris flows occurred at Forest Falls, totaling $3.2 million in damage, two houses were destroyed and 77 damaged.
Car-size boulders and a wall of mud 150 feet wide and 15 feet tall were reported.
Flooding damage also occurred at Oak Glen.
1996: Heavy thunderstorm rains produced flood waters which caused damage to parts of US Highway 95 between Needles, CA and Vidal Junction, CA.
Eight vehicles were stranded by flooded washes running across the highway and one car was caught in the flood waters.
No injuries occurred, but the 43 mile stretch of road was closed for a week to repair the damage.
1991: A thunderstorm complex produced golf ball sized hail across parts of the San Bernardino Mountains.
The Big Bear Lake area reported hail up to 2.5" deep.
1988: The high temperature at Reno, NV, was 100° F.
1988: Santa Ana winds and a strong ridge of high pressure overhead sent temperatures soaring.
San Diego topped out at 107° F, Santa Ana was 108° F and Downtown L.A. was 110° F.
Hundreds of thousands of people flocked to the beaches only to find scorching sand.
Santa Monica Hospital treated 9 people for burns on their feet.
1984: A tropical air mass lasting two weeks and high sea surface temperatures led to record minimum temperature records set each day except one at San Diego starting on this day and ending on 9.19.
Low temperatures ranged from 73° F to the highest minimum of all time of 78° F on 9.9 and 9.17. The high was 100° F on 9.8.
1976: Five tornadoes were reported around El Mirage, west of Victorville, and one near Mt. Baldy during a period that started on this day and ended on 9.6.
Property damage resulted.
1963: Tropical storm Jen-Kath hit Baja California just south of Ensenada.
The resulting tropical depression staggered across the border into Southern California producing daily record rainfall for most stations on this day.
1955: Santa Rosa had a high of 108° F.
1955: Hanford records its latest 110° F high temperature on record.
1939: The remnants of a hurricane tracked northeastward across northern Baja California into southwest Arizona starting on this day and ending on 9.6.
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 3' of water.
Extensive damage occurred in Mecca.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, Phoenix, & San Diego
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