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2019 California and Southwest Weather Discussion Thread


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Snow level appears to have gotten down to around 3000 feet in the morning. I only got a high of 49.3 F today, one of the few sub-50F high temperatures I've recorded at this station. This morning's low temperature of 39.4 F was during the rain.

 

Santiago Peak this afternoon:

 

sp-n-mobo-c 22.jpg

 

Mount Wilson:

 

wilson-n-mobo-c 26.jpg

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My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Not much snow on top of Saddleback Mountain, but these exceptionally cold storms usually are pretty moisture starved.   First 6th days of February are averaging lower for the high temperatures than an

Snow level appears to have gotten down to around 3000 feet in the morning. I only got a high of 49.3 F today, one of the few sub-50F high temperatures I've recorded at this station. This morning's low

You guys are basically getting the ideal storm- strong winds, heavy rain, thunder and lightning, heavy snow, etc.   I am so jealous, enjoy it!

Posted Images

I'd also like to point out that we've had a higher-than-normal occurrence of abnormally cold winter storms this winter so far. We had a similarly close call back in February, but before that, the last time we had such a cold storm that brought widespread high precip amounts was in February 2011, and December 2008. Some inland areas did get actual snow during the December 2014 event, but that was not as wet or widespread.

 

Other times I recorded sub-50 F high temperatures were 2/8/13 (48.3F), 12/31/14 (46.9F), and 11/28/19 (48.2F). Season totals have already surpassed 2017-18's across most of the region.

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My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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I'm back in SoCal, so all the fun must be over :)   Driving back from New Mexico today, I encountered snow falling near Seligman and again at Cajon Pass.  It rained all the way across I-40 from Needles to Barstow.  First time I can remember that happening.  The snow at Cajon Pass was amazing.  I had never seen so much snow there.  Maybe 6" on the ground with more falling, but fortunately not hard enough to close the pass.  It was closed this morning, and I had an alternate route planned starting where Hwy 95 goes south from I-40 near Kingman.  By the time I got there, SigAlert.com showed the pass as open.

 

My rain gauge shows that 3.75" fell during the 6 days I was gone.  Figures!

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Despite all the rain, hills are taking a long time to completely green up here. Not sure exactly how all the dead brown stuff goes away. It must eventually be uprooted by new growth. Hopefully within a few more weeks everything will be completely green, as we have more rain in most areas than last year at time.

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Despite all the rain, hills are taking a long time to completely green up here. Not sure exactly how all the dead brown stuff goes away. It must eventually be uprooted by new growth. Hopefully within a few more weeks everything will be completely green, as we have more rain in most areas than last year at time.

 

They don't usually green this early, except in cases like 2004-05 where the rains started as early as October. But maybe in about a month or two, depending on how things further play out.

 

It's also possible that we get a good wildflower season in Spring, given the cold temperatures so far this winter and it hasn't been dominated by excessively warm, dry high pressure, like in some winters (such as 2017-18). January and February are still ahead, although a pattern of dry Marches prevents me from hoping for that month.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Car windows are all iced-over this morning. 35F right now.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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I found a study published about the discontinuity of records and climate differences regarding the move of the official Downtown Los Angeles weather station from DWP site, to the milder USC site several miles to the southwest in 1999. Since the original DWP station is apparently still active, the study compares data and records between the DWP and USC stations from 1999 to 2014.

 

http://scholarworks.csun.edu/bitstream/handle/10211.3/170953/Patzert-etal-CG-2016-p41-52.pdf?sequence=1

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My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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I found a study published about the discontinuity of records and climate differences regarding the move of the official Downtown Los Angeles weather station from DWP site, to the milder USC site several miles to the southwest in 1999. Since the original DWP station is apparently still active, the study compares data and records between the DWP and USC stations from 1999 to 2014.

 

http://scholarworks.csun.edu/bitstream/handle/10211.3/170953/Patzert-etal-CG-2016-p41-52.pdf?sequence=1

 

That's a good find.  I remember that the autumn after the Downtown LA station moved from the DWP building to USC in 1999, the LA Times published an article noting how much cooler that summer had been than the previous one.  I wrote a letter to the editor suggesting that the station move invalidated this comparison to some degree.  Not only was the letter actually published (my name in the LA Times!  Fame at last!), but they published a follow-up letter a few days later from a NWS representative whose justification -- that stations move around all the time, and the Downtown LA station had moved several times previously -- seemed weak to me.  According to the study you found, it turns out my concerns were justified after all! :)

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That's a good find.  I remember that the autumn after the Downtown LA station moved from the DWP building to USC in 1999, the LA Times published an article noting how much cooler that summer had been than the previous one.  I wrote a letter to the editor suggesting that the station move invalidated this comparison to some degree.  Not only was the letter actually published (my name in the LA Times!  Fame at last!), but they published a follow-up letter a few days later from a NWS representative whose justification -- that stations move around all the time, and the Downtown LA station had moved several times previously -- seemed weak to me.  According to the study you found, it turns out my concerns were justified after all! :)

 

Looks like you were ahead of the curve back then, good that you noticed it so early on. I found another story from JPL/NASA from 2007 about it, as well as a humorous account of it from a citizen in 2008. The disparity in observations from pre-1999 and post-1999 is very apparent when viewing the daily temperature graphs for the station on climatestations.com. I've spoken to the site owner about it, he noticed the same thing.

 

Note the sudden drop-off in annual mean temps. While 1999, 2001 and 2002 were indeed relatively cool years, they were not so drastically cooler as shown now. DWP temps would have been warmer still.

 

lacvannt.gif

 

I put together graphs comparing some years at the Civic Center to the USC site, side-by-side. Note the lack of variability and less prone to extremes the USC station is:

 

comparison 97 01.png

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My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Less than 0.10" predicted for us now. Mountains are still expected to get snow, however.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Per NWSLA AFD: "Rain chances fading faster than a cheap postcard."  I always like when they spice it up a bit.

 

Looks like it's gonna be pretty boring around here for at least the next couple of weeks.  Guess I'll need to go out of town again in order for SoCal to score any more interesting weather.

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Snow still visible on the mountains as low as roughly 4200 feet.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Nice pic of the western side of the Santa Anas, Mr Marine Layer.

 

Had some drizzle about an hour ago for a few minutes. Wasn't measurable, but at least I get to put Trace for today's precipitation.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Windy here tonight as well, keeping temps rather warm.

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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Happy New Year and New Decade everyone. Wonder what extremes and trends are in store for us this decade. Maybe another low snow event, or a wet 30"+ rainy season? Haven't had one since 2004-05.

 

2019 at my station:

2019.png

 

My personal weather station: Davis Instruments Vantage Pro 2

 

2020-2021 Season Total: 0.00" (as of 9/30/20)

 

2019-2020 Season Total: 15.82"

2018-2019 Season Total: 15.84"

2017-2018 Season Total: 4.63"

2016-2017 Season Total: 15.18"

2015-2016 Season Total: 8.12"

2014-2015 Season Total: 10.09"

 

California Water Year/Rainy Season measuring period runs from July 1 to June 30.
 
 

 

 

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