Wednesday, October 2, 2019

[CaliforniaDisasters] On This Date In California Weather History (October 1)

2010: The Highway Patrol reported flooded lanes on I5 at Fort Tejon due to heavy rain and hail from thunderstorms.

2001: Thunderstorms developed in mountains and inland valleys (of SoCal) each day starting on 9.30 and ending on this day.

1981: Very heavy rain from a thunderstorm complex drops 1.92" of rain at Mojave.
Highway 58 was closed due to flooding.
Flooding was reported in Beaumont.
One was killed by lightning at Cuyamaca Rancho State Park.

1980: This was the start of a three days in a row when Mount Hamilton hit 93° F which happens to be its warmest temperature for October.

1980: Paso Robles hit 106° F establishing an all-time record high for the month.

1980: It was 109° F in Riverside and 105° F in Ramona, each the highest temperature on record for October.
It was 103° F in Alpine and 93° in Idyllwild, each tying the highest temperature on record for October.
This also occurred in Idyllwild on 10/12/1950 and in Alpine on several other October dates.  

1980: 103° F at Bakersfield for a high temperature, sets a record high for the month of October (also set on the 4th and 5th of October that same year).

1980: The high temperature at Reno, NV was a warm 91° F.

1978: The high temperature of 103° F in Las Vegas, NV, set the all-time warmest reading for October.

1976: Heavy rain drenched parts of the central San Joaquin Valley.
Fresno received 1.46" of rain on this date, setting a daily precipitation record.
Several roads were heavily flooded in the city, temporarily stranding some motorists.
Los Banos received a half of an inch of rain in just 30 minutes.
Many roads in and fields in Mendota were flooded.

1971: Caribbean Sea Hurricane Irene crossed Nicaragua and reformed in the eastern Pacific as Hurricane Olivia.
Olivia recurved to the northeast and made landfall in central Baja California with rainfall of up to 1" in the southern deserts on 9.30 and on this day.
This occurred during the La Niña of 1970-71.

1946: A tropical storm moved northward into northern Baja California and dissipated with rainfall of up to 4" in the mountains on 9.30 and exceeding 4" in the mountains on this day.
This occurred during the El Niño of 1946-47.

1946: Woodfords (Alpine Co. near Markleeville) recorded 1.27" of precipitation.

1932: Heavy rains starting on 9/28 and ending on this day came from a dying tropical cyclone.
It brought flooding to parts of the mountains and deserts of Southern California.
4.38" of rain fell at Tehachapi in seven hours on 9/30, and the four day storm total was 7.10".
The resulting flash flooding in Tehachapi Creek caused widespread damage.
Multiple trains were caught in the flooding, including a Santa Fe steam engine that was buried under ten feet of mud and sand.
A gas station, café and several cabins were destroyed by a wall of water when a culvert clogged with debris suddenly gave way.
At least 15 people perished in floods and monetary damages exceeded $1 million dollars in 1932 dollars.
An exact death toll is unknown, as many people were "riding the rails" during the Great Depression. 

1921: 1.5" fell (in SoCal) on 9.30 and on this day, the greatest 24-hour total on record for September.

Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego

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[CaliforniaDisasters] 1943 Hauser Fire Anniversary - Wed, 10/02/2019 #cal-notice

1943 Hauser Fire Anniversary

When:
Wednesday, 2 October 2019

Where:
Peninsular Ranges - San Diego County

Description:
The Hauser Fire was started by tracer rounds fired in a military training exercise. 77 Marines from the Pine Valley training camp and the 10th Army Buffalo Soldiers Cavalry Regiment from Camp Lockett fought the fire on 10/2/43, building indirect handline in a steep drainage. When the strong Santa Anas (E winds) diminished, the normal canyon SW winds increased, reversing the direction of the fire and pushing the marines up into Hauser Canyon. Their retreat to a safe area was cut off. Almost all were caught and injured; 4 outran the fire. 9 Marines and 1 Army soldier (and possibly 1 civilian) were overrun and died. The remaining troops were injured to various degrees. 16,000 acres were scorched and San Diego's water supply was threatened.

Source: https://wlfalwaysremember.org/incident-lists/169-hauser-creek.html

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Tuesday, October 1, 2019

Re: [CaliforniaDisasters] As Seen on TV: Could a Hollywood-Sized Tsunami Hit Santa Monica?

Kevin,

I'm glad you are not in a tsunami inundation zone where you live. I recall that Kings Harbor suffered significant liquefaction from the Northridge Quake in 1994 so it appears to be a very bad place to build structures due vulnerabilities to multiple different hazards.

On Tue, Oct 1, 2019 at 9:03 PM kevin asato <kc6pob@gmail.com> wrote:
Interesting read. i missed the show as i was working. 

While Santa Monica itself may be relatively immune to tsumami conditions, Redondo Beach (where i live), a bit further south, looks prime. There is a deep underwater canyon which can and has channeled wave energy towards King Harbor with destructive results. It also contributes to the local surf and riptide conditions where otherwise the waves would be flat as the southern part of Santa Monica Bay is shadowed by the Palos Verdes Peninsula.

On high ground in Redondo Beach,
73,
kevin
kc6pob

On Mon, Sep 30, 2019 at 12:19 AM Kim Noyes <kimnoyes@gmail.com> wrote:

As Seen on TV: Could a Hollywood-Sized Tsunami Hit Santa Monica?



On Monday night, the Fox Television show "9-1-1" was based around a 50-foot tsunami hitting the Southern California coast near Santa Monica.  The show employed the giant water tanks that were used to create the effects in the movie "Titanic." The episode ended (to be continued!) with a cresting wave about to engulf the pier.

Entertaining stuff, to be sure. But reality? Could a tsunami this size really happen in Southern California?

Unless it's caused by an asteroid plunging into the ocean, probably not.

The California Geological Survey has worked with other experts in the tsunami field for over a decade to determine the maximum tsunami threats which could impact each section of the California coast.  There are earthquake and landslide sources offshore of Southern California which could generate a tsunami that hits the coast in 10 minutes. However, there are no tsunami sources capable of creating the giant "tidal wave" portrayed in the TV show.

The largest locally-sourced tsunami which could hit Santa Monica would be about 8 feet tall, which could flood the beach and injure people if they do not immediately evacuate to higher ground.

The maximum tsunami possible in Santa Monica is about 15 feet high. Such a tsunami would be generated by a massive earthquake off the coast of Alaska, so people in Southern California would get 5-6 hours of warning — plenty of time to get to a higher, safe location.

The reality of tsunami hazards is not always represented correctly by Hollywood. But that doesn't mean they're not dangerous or that folks who live near or visit the beach shouldn't learn about and prepare for future tsunamis.

ARE YOU PREPARED FOR A TSUNAMI?

If you really want to see how much flooding could occur along the California coast from the largest tsunamis, visit www.tsunami.ca.gov and take a look at our tsunami inundation maps for evacuation planning for your area of interest.

So, we hoped you enjoyed the TV show – the next episode, "Sink or Swim" – airs at 8 p.m. Monday, but make sure you understand the realistic tsunami hazards you could face and be prepared for them.


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Re: [CaliforniaDisasters] As Seen on TV: Could a Hollywood-Sized Tsunami Hit Santa Monica?

Interesting read. i missed the show as i was working. 

While Santa Monica itself may be relatively immune to tsumami conditions, Redondo Beach (where i live), a bit further south, looks prime. There is a deep underwater canyon which can and has channeled wave energy towards King Harbor with destructive results. It also contributes to the local surf and riptide conditions where otherwise the waves would be flat as the southern part of Santa Monica Bay is shadowed by the Palos Verdes Peninsula.

On high ground in Redondo Beach,
73,
kevin
kc6pob

On Mon, Sep 30, 2019 at 12:19 AM Kim Noyes <kimnoyes@gmail.com> wrote:

As Seen on TV: Could a Hollywood-Sized Tsunami Hit Santa Monica?



On Monday night, the Fox Television show "9-1-1" was based around a 50-foot tsunami hitting the Southern California coast near Santa Monica.  The show employed the giant water tanks that were used to create the effects in the movie "Titanic." The episode ended (to be continued!) with a cresting wave about to engulf the pier.

Entertaining stuff, to be sure. But reality? Could a tsunami this size really happen in Southern California?

Unless it's caused by an asteroid plunging into the ocean, probably not.

The California Geological Survey has worked with other experts in the tsunami field for over a decade to determine the maximum tsunami threats which could impact each section of the California coast.  There are earthquake and landslide sources offshore of Southern California which could generate a tsunami that hits the coast in 10 minutes. However, there are no tsunami sources capable of creating the giant "tidal wave" portrayed in the TV show.

The largest locally-sourced tsunami which could hit Santa Monica would be about 8 feet tall, which could flood the beach and injure people if they do not immediately evacuate to higher ground.

The maximum tsunami possible in Santa Monica is about 15 feet high. Such a tsunami would be generated by a massive earthquake off the coast of Alaska, so people in Southern California would get 5-6 hours of warning — plenty of time to get to a higher, safe location.

The reality of tsunami hazards is not always represented correctly by Hollywood. But that doesn't mean they're not dangerous or that folks who live near or visit the beach shouldn't learn about and prepare for future tsunamis.

ARE YOU PREPARED FOR A TSUNAMI?

If you really want to see how much flooding could occur along the California coast from the largest tsunamis, visit www.tsunami.ca.gov and take a look at our tsunami inundation maps for evacuation planning for your area of interest.

So, we hoped you enjoyed the TV show – the next episode, "Sink or Swim" – airs at 8 p.m. Monday, but make sure you understand the realistic tsunami hazards you could face and be prepared for them.


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[CaliforniaDisasters] 1987 Whittier Narrows Quake Anniversary - Tue, 10/01/2019 #cal-notice

1987 Whittier Narrows Quake Anniversary

When:
Tuesday, 1 October 2019

Where:
San Gabriel Valley - Los Angeles County

Description:
The 1987 Whittier Narrows earthquake occurred in the southern San Gabriel Valley and surrounding communities of southern California at 7:42 a.m. PDT on October 1. The moderate 5.9 magnitude blind thrust earthquake was centered several miles north of Whittier in the town of Rosemead, had a relatively shallow depth, and was felt throughout southern California and southern Nevada. A large number of homes and businesses were impacted, along with roadway disruptions, mainly in Los Angeles and Orange counties. Damage estimates ranged from $213–358 million, with 200 injuries, three directly-related deaths, and five additional fatalities that were associated with the event.

Source: https://en.wikipedia.org/wiki/1987_Whittier_Narrows_earthquake

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