2009: A strong thunderstorm produced 0.55" of rain in 24 minutes in Moreno Valley.
Minor flash flooding resulted. Heavy thunderstorms moved through northern San Diego County, with over an inch reported in Ramona and San Diego Country Estates.
4" of mud and water was reported on Highway 78 near Witch Creek.
2007: A heavy thunderstorm hit Wrightwood and produced a flash flood that washed out Trush Road and Victorville Road.
This was the 3rd of 3 consecutive days (also 8.31 and 9.1) of flash flooding in Wrightwood.
A severe microburst struck downtown Ramona.
Numerous trees and power poles were blown over.
A few outbuildings, fences, signs, etc., were damaged or destroyed.
A heat wave began on 9.1 and continued until 9.3, 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 6 deaths from heat related illnesses.
2006: A thunderstorm near Pinyon Pines dropped 1.14" of rain in 30 minutes.
Flash flooding resulted in Pinyon Flats, eroding roads.
Mudslides trapped several vehicles on Highway 74.
Thunderstorm winds were estimated at 58 mph in the Coachella Valley.
Nickel size hail fell near Campo.
Lightning sparked two fires near Warner Springs.
In the Coachella Valley damage was done to trees, power lines, and street signs.
2003: Thunderstorms developed in the mountains and deserts starting on this day and ending on 9.3.
Rain rates of more than 1"/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.
1.25" hail was reported at Descanso.
2001: Thunderstorms developed in the mountains each day starting on this day and ending on 9.3.
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.
1998: Severe thunderstorms occurred at Hemet and San Marcos from remnants of Hurricane Isis.
Strong wind gusts of 40 mph hit Orange County and contributed to large fires.
A funnel cloud was observed on this day in Pomona.
1997: Thunderstorms brought 1" diameter hail to Mount Mesa (near Lake Isabella) and dropped 1.11" of rain in 30 minutes at Ridgecrest.
The heavy rain in Ridgecrest caused numerous intersections in town to flood and some were covered with 2" to 6" of mud.
An automated station just west of Ridgecrest recorded 0.90" of rain in just 8 minutes!
1997: A thunderstorm at Pine Cove dropped 3.7" of rain in one hour.
Strong thunderstorms developed on 9.1 and again on this day produced three wind gusts of 104 mph at Twentynine Palms.
Apple Valley received a gust of 62 mph.
A large tree was blown down in Apple Valley.
1987: Lightning struck a woman in the afternoon in the Lake Henshaw area of Palomar Mountain.
Ten fires were started by lightning in the mountains of San Diego County.
It was 87° F in Big Bear Lake, the highest temperature on record for September.
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 of up to one inch in the mountains from 8.29 to 9.6.
This tropical cyclone holds the distinction of traveling the farthest west before recurving and making landfall in Southern California.
This occurred during the El Nino of 1972-73.
Only 0.44" was measured in San Diego.
1967: Hurricane Katrina comes up the Gulf of California and comes ashore south of Yuma.
Over 2" of rain fall in southwest Arizona with lesser amounts elsewhere.
1964: It was 19° F frigid degrees in Big Bear Lake, the lowest temperature on record for September.
1960: Very severe thunderstorms hit southeast San Diego County with golf ball size and baseball size hail in the Boulevard area.
2"-3" of precipitation fell.
Hail diameter was measured at 2.75" and weighed over one pound.
Some stones were estimated larger.
Considerable damage to houses was incurred.
2.75" hail was also reported in Riverside County.
A thunderstorm dropped more than 2" of rain on San Bernardino.
Homes and businesses were flooded in east San Bernardino and Loma Linda.
Severe thunderstorm winds in east San Bernardino blew roofs off houses, smashed windows and blew down dozens of power poles.
Thunderstorms also hit Twentynine Palms with flash floods damaging streets and highways.
1955: King City had a high of 103° F.
1950: It was126° F in Mecca, the national maximum temperature record for September.
1945: A heavy thunderstorm hit Wrightwood.
One residence was destroyed and debris covered Lone Pine Road.
Source: NWS San Francisco/Monterey, Hanford, Las Vegas, Phoenix, & San Diego
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Minor flash flooding resulted. Heavy thunderstorms moved through northern San Diego County, with over an inch reported in Ramona and San Diego Country Estates.
4" of mud and water was reported on Highway 78 near Witch Creek.
2007: A heavy thunderstorm hit Wrightwood and produced a flash flood that washed out Trush Road and Victorville Road.
This was the 3rd of 3 consecutive days (also 8.31 and 9.1) of flash flooding in Wrightwood.
A severe microburst struck downtown Ramona.
Numerous trees and power poles were blown over.
A few outbuildings, fences, signs, etc., were damaged or destroyed.
A heat wave began on 9.1 and continued until 9.3, 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 6 deaths from heat related illnesses.
2006: A thunderstorm near Pinyon Pines dropped 1.14" of rain in 30 minutes.
Flash flooding resulted in Pinyon Flats, eroding roads.
Mudslides trapped several vehicles on Highway 74.
Thunderstorm winds were estimated at 58 mph in the Coachella Valley.
Nickel size hail fell near Campo.
Lightning sparked two fires near Warner Springs.
In the Coachella Valley damage was done to trees, power lines, and street signs.
2003: Thunderstorms developed in the mountains and deserts starting on this day and ending on 9.3.
Rain rates of more than 1"/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.
1.25" hail was reported at Descanso.
2001: Thunderstorms developed in the mountains each day starting on this day and ending on 9.3.
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.
1998: Severe thunderstorms occurred at Hemet and San Marcos from remnants of Hurricane Isis.
Strong wind gusts of 40 mph hit Orange County and contributed to large fires.
A funnel cloud was observed on this day in Pomona.
1997: Thunderstorms brought 1" diameter hail to Mount Mesa (near Lake Isabella) and dropped 1.11" of rain in 30 minutes at Ridgecrest.
The heavy rain in Ridgecrest caused numerous intersections in town to flood and some were covered with 2" to 6" of mud.
An automated station just west of Ridgecrest recorded 0.90" of rain in just 8 minutes!
1997: A thunderstorm at Pine Cove dropped 3.7" of rain in one hour.
Strong thunderstorms developed on 9.1 and again on this day produced three wind gusts of 104 mph at Twentynine Palms.
Apple Valley received a gust of 62 mph.
A large tree was blown down in Apple Valley.
1997: Thunderstorms rolled into the Pahrump Valley (CA-NV border) during the evening and started a deluge
which inundated the area for 2 days.
1987: Lightning struck a woman in the afternoon in the Lake Henshaw area of Palomar Mountain.
Ten fires were started by lightning in the mountains of San Diego County.
It was 87° F in Big Bear Lake, the highest temperature on record for September.
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 of up to one inch in the mountains from 8.29 to 9.6.
This tropical cyclone holds the distinction of traveling the farthest west before recurving and making landfall in Southern California.
This occurred during the El Nino of 1972-73.
Only 0.44" was measured in San Diego.
1967: Hurricane Katrina comes up the Gulf of California and comes ashore south of Yuma.
Over 2" of rain fall in southwest Arizona with lesser amounts elsewhere.
1964: It was 19° F frigid degrees in Big Bear Lake, the lowest temperature on record for September.
1960: Very severe thunderstorms hit southeast San Diego County with golf ball size and baseball size hail in the Boulevard area.
2"-3" of precipitation fell.
Hail diameter was measured at 2.75" and weighed over one pound.
Some stones were estimated larger.
Considerable damage to houses was incurred.
2.75" hail was also reported in Riverside County.
A thunderstorm dropped more than 2" of rain on San Bernardino.
Homes and businesses were flooded in east San Bernardino and Loma Linda.
Severe thunderstorm winds in east San Bernardino blew roofs off houses, smashed windows and blew down dozens of power poles.
Thunderstorms also hit Twentynine Palms with flash floods damaging streets and highways.
1955: King City had a high of 103° F.
1950: It was126° F in Mecca, the national maximum temperature record for September.
1945: A heavy thunderstorm hit Wrightwood.
One residence was destroyed and debris covered Lone Pine Road.
Source: NWS San Francisco/Monterey, Hanford, Las Vegas, Phoenix, & San Diego
--
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