PG&E and SoCal Edison Mesonets

In recent months both Pacific Gas & Electric (PG&E) and Southern California Edison (SCE) have been installing extensive weather station networks. Primarily mounted on utility poles they gather wind, temperature and humidity data every 10 minutes. Currently PG&E has about 100 stations online and SCE about 70 stations; and it is my understanding that more are being installed. (San Diego Gas & Electric (SDG&E) has had a similar mesonet of about 150 stations for about 5 years) The data is available on MesoWest and on via NWS graphical interface. However, neither MesoWest or the NWS page let's one parse out just these mesonets, so I have put together a couple pages, both in tabular and map/graphical form.

PG&E: Table, Map 
SCE: TableMap
SDG&E mesonet
These have both been added to the Mesonet section on my Meteorologist Links page.

Enjoy and please let me know of any comments or suggestions.

Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/




 

Posted

California Summer Temps Mostly Above Average - Recap

 

Meteorological summer (i.e., June, July, August) has ended and most of the Golden State ended up with above normal temperatures. The biggest anomalies were over the southern half of the California and over the northern interior.  



Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/

 

Posted

San Francisco still a month away from average hottest day


San Francisco is still a month away from their normal hottest day of the year! Conversely, most other cities around California and the nation are well past their normal hottest day, which typically occurs about a month after the Summer Solstice. But a few locations, especially along the West Coast, wait until August and even September to peak. And San Francisco is certainly the latest of any major United States city by not reaching its normal highest maximum temperature of 70.4 until September 24t.
Source: http://ggweather.com/normals/daily.htm 

Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/

 
Posted

El Niño Rainfall Climatology


With the eastern tropical Pacific warming and most forecasts leaning toward at least a weak El Niño event this coming winter I have put together a new climatology looking at early-August conditions relative to the subsequent rainfall season.  I have also updated several previous ENSO climatologies with regards to rainfall and temperatures.

 

New: Early August Comparative Weak/Moderate El Niño Seasonal Rainfall Climatology 



Updated: US Winter Precipitation & Temperature Climatologies: El Niño  |  La Niña
Updated: California El Niño Precipitation Climatology
Updated: California La Niña Precipitation Climatology 

Updated links to all of the above and more at EL NIÑO / LA NIÑA RESOURCE PAGE


Posted

Summary of California 2017-2018 Rainfall Season Ending Tomorrow

The California 2017-2018 rainfall season ends tomorrow with totals across the state below normal and on the order of half of the totals recorded in 2016-17. See http://ggweather.com/ca2017rain.htm and http://ggweather.com/ca2016rain.htm.



See also the Precipitation Snapshot at http://ggweather.com/water/



Also the Western Region Climate Center's Precipitation Anomaly maps from https://wrcc.dri.edu/anom/cal_anom.html



Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/

 
Posted

Updated Resource Pages; Tioga Pass by the Nummbers


I have updated the following Weather Resource pages for 2018. But please let me know of any errata, suggestions or additions. Enjoy.

2018 Thunderstorm and Tornado Resource Guide

2018 Hurricane Resource Guide

2018 Fire Weather Resource Guide


~~~~~~~~~~~~~~~~~~~~~~~~

With Tioga Pass due to open Monday (5/21/2018) here are some historical records going back to 1980.



Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/


 
Posted

Beware Daily Weather Records!!

 

During big rain events, a particular rainfall amount may be touted as record rainfall for the date, just as during hot weather the temperature may be proclaimed a daily maximum record. Ideally, meteorological data should be based on where we are in our orbit around the sun and not a particular calendar day. This is because our calendar is slightly flawed when it comes to specific days as it takes 365.25 days to circle the sun giving us a leap day every four years.

Consequently, the dates in a leap year after February 29th, are all displaced by one day. That is, April 6th in 2017, 2018 and 2019 is the 96th day of the year, while April 6th in a leap year (i.e., 2016, 2020) is the 97th day. So, if a record event for a particular date happened in a leap year versus a non-leap year we are actually comparing different days based upon of position relative to the "solar year".

For example, the largest rainfall amount for San Francisco for April 21st is 1.39” in 1880, a leap year so it was the 112th day of that year. But the record for April 22nd, is 0.43” in 2007, not a leap year so it is also the 112th day of the year!
Which is correct?  The bottom line is that neither is really right all of the time!
 

Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com 
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/

 

Posted

1 & 2-Day SF Bay Area April Rainfall Records

  

1 and 2 Day SF Bay Area April Rainfall Records

 

One Day Record

Two Day Record

 

 Name

Rain (in.)

Date

Rain (in.)

Date

Since

ALAMEDA COUNTY

 BERKELEY

2.49

 1896-04-24 

4.04

 1958-04-02 

1893

 FREMONT

0.96

 2003-04-13 

1.62

 2003-04-13 

1996

 HAYWARD AIR TERMINAL

0.98

 2012-04-10 

1.65

 2003-04-13 

1998

 LIVERMORE

1.80

 1958-04-03 

2.10

 1958-04-04 

1903

 LIVERMORE MUNICIPAL AP

1.14

 2003-04-12 

1.79

 2003-04-13 

1998

 NEWARK

1.41

 2003-04-13 

1.46

 2003-04-14 

1906

 OAKLAND INTL AP

2.03

 1974-04-01 

2.24

 2012-04-13 

1948

 OAKLAND MUSEUM

2.07

 1974-04-01 

2.10

 1974-04-02 

1970

 TRACY PUMPING PLANT

1.10

 1983-04-28 

1.70

 1983-04-28 

1955

 UPPER SAN LEANDRO FILTERS

2.20

 1974-04-02 

3.12

 1974-04-02 

1948

CONTRA COSTA COUNTY

 CONCORD BUCHANAN FIELD

0.97

 2012-04-12 

1.54

 2017-04-07 

1999

 CONCORD WASTEWATER PLANT

1.20

 2017-04-07 

1.91

 2017-04-08 

1991

 MARTINEZ WATER PLANT

1.50

 2003-04-13 

1.81

 2017-04-08 

1970

 MOUNT DIABLO JUNCTION

2.35

 1958-04-03 

2.90

 1958-04-04+

1952

 RICHMOND

2.32

 1953-04-27 

2.48

 1982-04-11 

1950

MARIN COUNTY

 KENTFIELD

4.95

 1935-04-07 

5.31

 1935-04-08 

1902

 SAN RAFAEL-CIVIC CENTER

4.39

 1896-04-25 

5.24

 1958-04-02 

1894

MONTEREY COUNTY

 BIG SUR STATION

4.50

 1982-04-11 

6.37

 1982-04-11 

1915

 CARMEL VALLEY

1.60

 2006-04-05 

2.27

 2006-04-05 

1959

 KING CITY

1.58

 1982-04-10 

2.25

 1912-04-10 

1902

 MONTEREY

2.11

 1974-04-01 

2.36

 1912-04-11 

1906

 MONTEREY PENINSUL AP

1.23

 1969-04-05 

1.47

 1969-04-06 

1968

 MONTEREY WFO

1.45

 2006-04-04 

1.68

 2006-04-04 

1995

 SALINAS AP

2.15

 1974-04-01 

2.15

 1974-04-02 

1930

 SALINAS NO. 2

2.09

 1974-04-01 

2.58

 1974-04-02 

1958

NAPA COUNTY

 ANGWIN PACIFIC UNION COL

3.08

 1982-04-11 

3.82

 1982-04-11+

1940

 CALISTOGA

2.65

 1911-04-05 

5.26

 1996-04-02 

1906

 MARKLEY COVE

2.64

 1982-04-11 

2.94

 1982-04-12 

1970

 NAPA COUNTY AIRPORT

1.07

 2017-04-06 

1.85

 2017-04-07 

1998

 NAPA STATE HOSPITAL

2.66

 1996-04-01 

3.23

 1958-04-03 

1893

 SAINT HELENA

3.52

 1927-04-01 

5.64

 1926-04-05 

1907

 SAINT HELENA 4 WSW

2.20

 2010-04-12 

2.88

 2017-04-08+

1948

SAN BENITO COUNTY

 HOLLISTER 2

1.43

 1981-04-19 

1.63

 1981-04-20 

1948

 PANOCHE 2 W

1.14

 1958-04-03 

1.24

 1957-04-18 

1949

 PINNACLES NM

2.17

 1958-04-03 

2.39

 1958-04-04 

1937

SAN FRANCISCO COUNTY

 SAN FRANCISCO DOWNTOWN

3.45

 1853-04-16 

3.59

 1853-04-17 

1849

 SAN FRANCISCO OCEANSIDE

1.45

 1978-04-15 

1.50

 1978-04-16 

1948

SAN MATEO COUNTY

 HALF MOON BAY

2.36

 1941-04-04 

2.54

 1953-04-27 

1939

 REDWOOD CITY

2.54

 1958-04-02 

3.90

 1958-04-02 

1906

 SAN FRANCISCO INTL AP

2.30

 1958-04-02 

3.21

 1958-04-02 

1945

 SKYLINE RIDGE PRESERVE

2.75

 2003-04-13 

2.96

 2003-04-13 

1995

SANTA CLARA COUNTY

 GILROY

3.65

 1958-04-03 

4.07

 1958-04-04 

1906

 LOS GATOS

3.70

 1901-04-29 

5.89

 1958-04-02 

1893

 MOFFETT FEDERAL AIRFIELD

1.17

 1958-04-02 

1.73

 1983-04-28 

1945

 MOUNT HAMILTON

1.87

 1965-04-09 

3.38

 1965-04-10 

1948

 SAN JOSE

1.46

 1983-04-28 

2.06

 2006-04-04 

1893

 BEN LOMOND NO. 4

5.35

 1941-04-04 

7.15

 1958-04-02 

1937

 SANTA CRUZ

3.75

 1923-04-04 

4.05

 1923-04-05 

1893

 WATSONVILLE MUNICIPAL AP

1.51

 2006-04-04 

2.24

 2012-04-13 

1945

 WATSONVILLE WATERWORKS

2.85

 1983-04-28 

3.15

 1983-04-29 

1908

SONOMA COUNTY

 BODEGA 6 WSW

2.28

 2010-04-11 

2.42

 2010-04-12 

2008

 CLOVERDALE

2.80

 1982-04-11 

4.20

 2010-04-12 

1950

 FORT ROSS

4.23

 1953-04-27 

5.36

 1953-04-27 

1895

 GRATON

4.00

 1953-04-27 

4.61

 1926-04-05 

1926

 HEALDSBURG

3.25

 1953-04-27 

4.57

 1927-04-02 

1893

 OCCIDENTAL

5.20

 1953-04-27 

5.49

 1953-04-28 

1943

 PETALUMA AIRPORT

2.45

 1941-04-04 

4.40

 1926-04-05 

1893

 SANTA ROSA

3.06

 1926-04-04 

5.99

 1926-04-05 

1902

 SANTA ROSA SONOMA CO AP

2.36

 2017-04-06 

2.77

 2017-04-07 

1998

 VENADO

4.68

 2006-04-12 

5.29

 2017-04-08 

1948



Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/


Posted

California April 1st Precipitation Update

 

March rainfall and snowfall across California saw the most significant gains in the Sierra Nevada Precipitation Indices where the average percentage of normal jumped from 41% of normal-to-date to 69% of normal. See http://ggweather.com/water/



Also http://ggweather.com/seasonal_rain.htm and 


Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com  
Web: http://ggweather.com
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/



 
Posted

California March Rainfall Summary - No Miracle 


As rainfall begins to taper off in many parts of the state, the historical context is that this is more of a Mediocre March than a Miracle March!  Rainfall today and a few showers over the weekend will add a little bit to the numbers below but in general the models have a pattern shift to high pressure and dry weather for next week. The bottom line is that while there have been good gains in rainfall statewide this month, most of California has a near zero chance of reaching normal for the season. 


The March 2018 values above are through midnight March 21.

Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Phone: (408) 379-7500
Email: jnull@ggweather.com   
Web: http://ggweather.com 
Twitter: https://twitter.com/ggweather
Facebook: https://www.facebook.com/Golden-Gate-Weather-Services-151100414926621/

 

Posted