Tuesday, April 4, 2017

[californiadisasters] On This Date In California Weather History (April 4)



2006: The Padres' home game (only the second game of the season) against the San Francisco Giants was rained out at Petco Park, the first rainout to ever occur at Petco Park (opened 4.8.2003).
It was the first rainout in nearly eight years (since 5.12.1998 at Qualcomm Stadium) and only the second rainout in nearly 23 years (4.20.1983 at then Jack Murphy Stadium).

2006: Four consecutive days of rain from April 2nd through the 5th resulted in the Black Rascal Creek swelling and flooding 300 homes in North Merced, prompting evacuations.

1989: Daily high temperature records were broken at ALL recording stations in Southern California on this day and on 4.5.
Many monthly record high temperatures were set for April: 112° F in Palm Springs, 106° F LA, 104° F Riverside, 103° F Escondido, 101° F Tustin, 98° F San Diego, 95° F Victorville, 76° F Big Bear Lake.
This was part of major heat wave from late March into mid April.

1988: Crews were planting hundreds of thousands of seedlings every day in Northern California  forests scorched by lightning fires the previous fall.
But by the time they would be finished with spring planting, workers would have planted on only a small portion of the land to be planted over the next three years.

1982: 14" of snow fell at Portola.

1961: It was 83° F in Palomar Mountain, the highest temperature on record for April.

1958: 45" of snow fell at Glenbrook, NV (east shore Lake Tahoe).

1958: Snow pellets fell in Las Vegas, NV, at McCarran Airport. 
This was the latest in the year that snow has been reported at this location.

1927: 1.97" of rain fell in Palm Springs, the greatest daily amount on record for April.

1923: Monterey picked up 3.75" of rain. 

Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego and the Redding Record-Searchlight

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Posted by: Kim Noyes <kimnoyes@gmail.com>


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Monday, April 3, 2017

[californiadisasters] M5.7 earthquake highlights rifting Gulf of California



M5.7 earthquake highlights rifting Gulf of California

By David Jacobson, Temblor

Check your seismic hazard rank

gulf-of-california-earthquake
Underneath the Gulf of California lies a textbook example of the opening of an ocean basin. This process is slowing causing Baja California to separate from mainland Mexico. (Photo from: history.com)

Yesterday, at 8:15 a.m. local time, a M=5.7 earthquake shook the southern portion of the Gulf of California. The quake was widely felt close to the epicenter, and felt reports came in on the USGS website from San Diego, where weak shaking would have been felt approximately 1,000 km away. Because the earthquake did not occur close to populated centers, no damage has been reported, and the USGS expects that none will be seen.

gulf-of-california-fault-map
This Temblor map shows the location of yesterday's earthquake as well and the plate motion in the area which is causing Baja California to slowly move farther away from mainland Mexico.

 

The Gulf of California is an important region tectonically as it marks a transitional corridor that separates the East Pacific Rise to the south, and the San Andreas Fault to the north. Over the last 20 million years, the western margin of the North American Plate has slowly evolved due to relative plate motions. In much of California and Baja California, the Pacific Plate is sliding northward. Products of this are strike-slip and extensional faults, which have caused Baja California to rift apart from mainland Mexico. It should also be pointed out that much of southwestern California is a remnant of the North American continent which was sheared off and moved to the northwest. This also means that the city of San Diego is slowly moving closer to San Francisco.

The video below shows the tectonic evolution of the western margin of North America

 

Within the Gulf of California, numerous spreading ridges are separated by traditional strike-slip faults. As the ridges move apart, small earthquakes occur near the ridges, while the larger earthquakes take place on the strike-slip faults. Most of the larger quakes in the Gulf are unlikely to disrupt daily life as they are far from populated areas. However, at the northern end of the Gulf, and into California's Imperial Valley, where the system transitions to a continental boundary, large earthquakes have the potential to cause significant damage. This is partially due to the fact that the region is underlain by soft sediments which can shake violently and liquefy in earthquakes.

fault-map
This Temblor map shows a regional map including yesterday's M=5.7 earthquake. This figure illustrates how the Gulf of California marks a transitional corridor between the San Andreas Fault and the East Pacific Rise. This figure also shows the Global Earthquake Activity Rate (GEAR) model which shows that M=6.75 earthquakes are likely throughout the Gulf.

 

Based on the Global Earthquake Activity Rate (GEAR) model, which incorporates strain rates and past seismicity, magnitude 6.5+ earthquakes are expected along nearly the entire extent of the Gulf of California. Therefore, a M=5.7 quake should come as no surprise. However, it does help shed light on how the western coast of North America has transformed over millions of years. Additionally, this region is a textbook example of the opening of an ocean basin.

Source: http://temblor.net/earthquake-insights/m5-7-earthquake-highlights-rifting-gulf-of-california-2893/



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Posted by: Kim Noyes <kimnoyes@gmail.com>


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[californiadisasters] On This Date In California Weather History (April 3)



2009: Strong onshore winds produced a gust of over 70 mph in Lucerne Valley, 57 mph in Desert Hot Springs and 53 mph in Palm Springs.
The high winds resulted in downed power lines and minor roof damage.
A 50 acre brush fire in Palm Springs damaged two homes and led to the evacuation of 50 other homes.
The fire began in the late afternoon, burning desert scrub near a residential neighborhood and was contained later that evening.

1999: A powerful wind storm struck the San Francisco and Monterey Bay Areas. 
 Strong and damaging northwest winds gusted in excess of 50 mph along the coast during the afternoon, and a peak wind gust of 93 mph was reported at the Point Reyes Lighthouse Visitor's Center. 
These strong winds resulted in two deaths and four injuries, along with numerous power outages which left 90,000 homes and businesses without power on Easter weekend. 

1999: An F0 tornado touched down in south Bakersfield blowing down a few trees and damaging a small shed.

1999: A waterspout was observed three miles southwest of Oceanside.

1987: A weak F0 tornado went through portions of Monterey County and caused $250,000 in property damage. 

1965: 1" of snow fell in Randsburg in the Kern County desert.

1961: It was 103° F in Riverside, the earliest date in the season on record to hit 100° F or higher.
It was 85° F in Idyllwild, the highest temperature on record for April.
This also occurred on 4.27.2004 and 4.28.2004.

1958: A small tornado was observed in Fresno.

1958: A heavy rainstorm struck the northern Inland Empire on 4.2 and on this day.
2.8" fell in San Bernardino and 2.25" in Redlands.
Heavy runoff caused flooding in San Bernardino, Fontana and in Hesperia-Apple Valley.
Creeks exceeded banks and numerous roads were blocked by water, mud and boulders.

1958: 44" of snow fell at Truckee, with 42" being reported at Tahoe City (west shore Lake Tahoe).

1955: Las Vegas, NV, drops to 31° F, tying the coldest ever in April.

1945: It was 20° F in Victorville, the lowest temperature on record for April.

1928:
Fresno began a 214 day stretch without measurable rain, the longest such streak on record here.

1921: Santa Maria established a record overnight monthly low with 28° F.

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

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Posted by: Kim Noyes <kimnoyes@gmail.com>


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Please join our Discussion Group at http://groups.yahoo.com/group/californiadisasters_discussion/ for topical but extended discussions started here or for less topical but nonetheless relevant messages.





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Sunday, April 2, 2017

[californiadisasters] On This Date In California Weather History (April 2)



2014: A waterspout was observed near North Island Naval Air Station (San Diego Bay).

1999:
A late winter storm that started on 4.1 and ended on this day brought snow to the region.
7"-9" fell at Pine Valley and Descanso, 2" at Boulevard, "heavy snow" was reported at Cherry Valley (3000 feet), and 1" at Homeland (1,700 feet).
Eight illegal immigrants were found dead near Descanso and two more just over the border.
50 survived wearing only light clothing and tennis shoes and had never experienced snow; they had been on foot for 3 days.
A funnel cloud was observed three miles west of La Jolla.

1997: Two day Mono Wind event brought winds as high as 70 mph to the southern Sierra Nevada and foothills.
A number of trees fell and struck buildings and cars in Yosemite National Park and roof damage occurred near Bass Lake.
A number of power lines also fell between Yosemite and Mariposa.

1997: A funnel cloud was observed five miles west of Lindbergh Field - San Diego.

1997: A late season cold low brought snow flurries to the west side of the Las Vegas
valley. 
In Las Vegas, NV, the high only reached 48° F and this tied for the coldest ever in April.

1968: 2.72" of precipitation fell in Idyllwild, the greatest daily amount on record for April.

1963: The morning low temperature at Truckee was 2° F.

1963:
It was 3° in Big Bear Lake, the lowest temperature on record for April.

1961: The high temperature at Reno, NV, was 83° F.

1958: San Francisco Airport picked up 2.3" of rain. 

1958: A heavy rainstorm struck the northern Inland Empire on this day and on 4.3.
2.8" fell in San Bernardino and 2.25" in Redlands.
Heavy runoff caused flooding in San Bernardino, Fontana and in Hesperia-Apple Valley.
Creeks exceeded banks and numerous roads were blocked by water, mud and boulders.
A tornado ripped a roof off a garage in eastern San Bernardino.

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

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Posted by: Kim Noyes <kimnoyes@gmail.com>


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Saturday, April 1, 2017

[californiadisasters] Emergency Manager's Weekly Report 3-31-17 [2 Attachments]

[Attachment(s) from Steve Detwiler included below]

Good Morning Everyone,

This week's edition is now available at: https://sites.google.com/site/emergencymanagersweeklyreport/

 

Steve Detwiler

EM Weekly Report Editor



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Attachment(s) from Steve Detwiler | View attachments on the web

2 of 2 File(s)


Posted by: Steve Detwiler <steveorange2011@gmail.com>


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[californiadisasters] On This Date In California Weather History (April 1)



2016: Unnatural thunderstorms developed out of clear weather over most urban centers in California producing strange repeating lightning strikes at particular intersections in downtown areas with no resulting thunder. 

2000: 
Santa Ana winds gusted to 93 mph at Mission Viejo and 67 mph in Anaheim Hills.

1999: A late winter storm that started on this day and ended on 4.2 brought snow to the region. 
7"-9" fell at Pine Valley and Descanso, 2" at Boulevard, "heavy snow" was reported at Cherry Valley (3000 feet), and 1" at Homeland (1,700 feet). 
Eight illegal immigrants were found dead near Descanso and two more just over the border. 
50 survived wearing only light clothing and tennis shoes and had never experienced snow; they had been on foot for three days. 
A waterspout was observed six miles off Newport Beach.

1998: The Lewis and Frazier Creeks swelled due to heavy rains and snowmelt resulting in flooding in the Tulare County towns of Lindsay, Strathmore and Tonyville damaging 32 homes.

1998: A winter like storm brought up to 36" of powdery snow to the ski resorts. 
18" was reported at Pine Cove. Grape size hail piled up two inches deep at Laguna Niguel. 
During a period starting on 3.31 and ending on this day, numerous funnel clouds were reported near the Orange and San Diego County coasts, two of which became waterspouts off Orange County. 
One waterspout briefly hit the coast as a tornado south of the Huntington Beach Pier.

1996: An F0 tornado touched down near Merced; another F0 tornado touched down near Tulare. 
In Los Banos, thunderstorm wind gusts of 50 to 80 mph lifted a hay storage shed, flattened 2 wood barns and an historical slate rock building as well as overturning a tractor trailer truck.

1992: Heavy rain from thunderstorms hit the region. 
One thunderstorm pounded Escondido with 3" of rainfall less than an hour and produced flash flooding.

1982: Coldest April high in Fresno, 49° (also set on April 7, 1999).

1982: 13" of snow fell in Big Bear Lake, the greatest April snowfall on record. 
Strong storm winds considered a tornado hit Encinitas – Leucadia. 
Trees were downed and greenhouses were destroyed.

1974: Monterey picked up 2.11" of rain. 

1965: 1.85" of rain fell in Santa Ana, the greatest daily amount on record for April.

1958: A tornado touched down in Laguna Beach. 
3.13" of rain fell in Palomar Mountain, the greatest daily amount on record for April.

1955: "One of the worst dust and windstorms in recent years" according to the California State Climatologist caused "widespread" damage in the San Joaquin Valley knocking down large numbers of trees, twisting TV antennas and knocking out power. 
Crops suffered damage as well with many cotton seeds blown away by the wind. 
Northwest winds sustained at 40-50 mph with gusts as high as 80 mph were observed in southeastern Tulare County. 
In Bakersfield near zero visibility was reported. 
Damage was most severe in Kern and Tulare Counties.

1946: A 7.8 magnitude earthquake hit the Aleutian Islands. 
Newport Harbor showed a five foot drop in tide. 
San Pedro showed a 2.5 foot jump in tide.

1927: 22" of snow fell at Tahoe City west shore Lake Tahoe).

1906: The high temperature at Reno, NV, was only 32° F.

1903: At least 3.06" of rain fell in San Bernardino. 
Rain fell on snow in the high country. 
Bridges and roads were washed out. 
A man using a cable car fell into the Santa Ana River and drowned.

1897: Fresno received 0.3" of rain. 
This is the earliest occurrence of the last measurable rain for the water year.

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


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Posted by: Kim Noyes <kimnoyes@gmail.com>


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