2017: A persistent low pressure system off the Southern California Coast produced enough instability for thunderstorms to develop over the Southern Sierra Nevada each afternoon between August 17 and August 23.
On the afternoon of the 18th, some slow moving thunderstorms produced heavy rainfall over Yosemite National Park which resulted in flash flooding in Yosemite Valley.
A slow moving thunderstorm produced 1.27 inches of rainfall in one hour at Yosemite Valley.
Pea sized hail was also reported.
Park Service video showed flash flooding in Yosemite Valley from heavy rainfall.
2014: The Junction wildfire started on August 18, 2014 and was contained on August 25, 2014.
The fire was located 1 mile northwest of Oakhurst in Madera County.
It burned 612 acres.
There were 47 structures destroyed and 6 damaged.
Many of the structures were outbuildings, motor homes and storage containers.
There were no fatalities.
The cost of containment was $4.9 million.
2014: The Way fire began on August 18, 2014 and was contained on August 27, 2014.
The fire was located 3 miles Northwest of Wofford Heights in Kern County. The fire burned 4,045 acres.
The cause is under investigation.
There were 12 structures lost and no fatalities.
Cost of containment was $6.9 million.
2013: The Shirley wildfire occurred in the Sequoia NF and the ignition occured on 8/18/13 due to lightning strikes.
The location was Democrat and Alta Sierra (Kern County).
The size was 794 acres and containment was reached on 8/22/13.
The cost to containment was $1.9 Million.
2013: A monsoonal thunderstorm produced a flash flood on Highway 58 near Boron. The local CHP reported rock and flood debris.
2013: The Tenant wildfire was in the Sequoia NF and the ignition date was 8/18 caused by lightning.
The location was near Democrat (Kern County) and the size was 411 acres. Containment was reached on 8/22 and the cost to containment was $950,000.
2013: Heavy thunderstorms developed in the high desert on this day.
Radar estimated rainfall west of Victorville at 7"!
Radar estimated rainfall west of Victorville at 7"!
Floodwaters damaged and closed several highways west of Phelan and in Apple Valley, and filled the El Mirage Dry Lake.
A landspout tornado was observed near Helendale.
2001: The arson-caused Creek Fire started on this date 2 miles north of Coulterville (Mariposa Co.) and burned 11,500 acres. There were no fatalities but 11 injuries and 8 structures were lost (4residences and 4 out-buildings). At one point at least 400 people were forced to evacuate due to the fire and it threatened at least 3000 structures.
1997: Tropical storm Ignacio produced 18' waves in Orange County from 8.17 to 8.19.
1983: Bakersfield received an inch of rain, with an additional 0.08" falling in the early morning hours of August 19th.
This was the greatest rainfall in 24 hours in Bakersfield in the month of August.
This also brought the monthly rainfall for August 1983 to 1.18", making it the wettest August on record here.
1983: This was the final day of a three-day visit from the remnants of Hurricane Ismael.
Rain fell over the entire region, but was especially intense in the Coachella Valley and along desert slopes of the mountains.
Over the three-day period, 3.51" of rain fell on Palm Springs and 5.85" were reported at Deep Canyon Lab (south of Palm Springs).
The resulting flash floods isolated 50,000 people in Palm Springs. Thunderstorms also knocked out power to 80,000 people in the Inland Empire and spawned a tornado in L.A.
Damages from the storm exceeded $19 million.
1977: Hurricane Doreen paralleled the west coast of Baja before dissipating west of San Diego. Severe flooding occurs in Yuma County, AZ, and around Bullhead City, AZ.
Rainfall in Yuma totals 2.96".
Severe flooding also occurred in California's Imperial Valley.
1975: Mount Hamilton (East Bay) received .75" of rain -- a record for the month.
1950: It was 104° for a high in the town of Tehachapi.
1946: The high temperature at Reno, NV, was 99° F.
1945: What is believed to be a decaying tropical storm hit the region on this day and on 8.19.
Especially hard hit was the eastern Coachella Valley, resulting in extensive damage at Oasis.
Water was 18' deep in Mecca.
1918: The high temperature in Death Valley, CA was 119° F.
This ended a record streak of 43 consecutive days with the high temperature 120 degrees or hotter.
1906: A tropical storm came up into the Gulf of California and the southwestern United States, giving the mountains and deserts heavy rainfall on this day and on 8.19.
Needles received 5.66" of rain, twice the normal seasonal rainfall.
This occurred during the El Niño of 1905-06.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, Phoenix, & San Diego
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