2018 California/Southwest Weather Thread

[Anti Marine Layer]

It took until 6:33 PM for the sun to reach an azimuth of 270 (due West) tonight with a sunset of 6:54 PM. By Sunday, it will not reach due West until after sunset because it will be Fall.

 

No haze in the air this evening as I walked 1.6 miles with my dog as the sun went down.

[Thunder98]

Sounds a lot like a weather forecast in a wet December in California.

 

 

[Guest happ]

 

Sounds a lot like a weather forecast in a wet December in California.

 

 

 

That has to be chilly even for Minnesota

[Guest happ]

MOS continues to underestimate afternoon heat. Not that it was hot but NWS forecasted much cooler maximums again

 

87/ 62 

[Anti Marine Layer]

Low clouds this morning for the first time in a while. Low dropped down to 60 F last night at Fullerton Airport. No more mornings with lows in the low 70s.

[Guest happ]

Morning stratus/ hazy afternoon sun

 

85/ 62 [same as yesterday] 

[Anti Marine Layer]

Very hazy today. In fact haze was thick enough to be reported as overcast in Fullerton this afternoon.

 

Sunrise should have occurred at the South Pole, but it looks to be cloudy there.

 

https://www.esrl.noaa.gov/gmd/obop/spo/livecamera.html

[Thunder98]

The weather is much cooler and cloudier today. 

[Guest happ]

https://twitter.com/Weather_West

 

[Guest happ]

I've recorded 28 minimums 70°+ [including two nights in 80's] thus far.

[Guest happ]

"87 days of smog: Southern California just saw its longest streak of bad air in decades" http://www.latimes.com/local/lanow/la-me-smog-streak-20180921-story.html

 

“This is one example of the close ties between air pollution and climate change, which makes meeting air quality standards even more challenging and illustrates the urgency for addressing climate change at all levels of government in the U.S. and globally,” said Barbara Finlayson-Pitts, an atmospheric chemist at UC Irvine who studies air quality".

[Anti Marine Layer]

Some towering cumulus visible today as the monsoon takes its last gasp. Fall starts tomorrow at 6:54 PM.

[Guest happ]

It felt warmer than yesterday due to high dew points

 

85/ 64

 

https://twitter.com/EricVonHaden1

[Anti Marine Layer]

Not only does the sun set about one hour and 18 minutes earlier than it did on the Summer Solstice tomorrow. It also gets dark faster. The equinoxes are when it gets dark fastest.

[Anti Marine Layer]

First day of Fall today although it does not officially start until after sunset. At solar noon, you can point a pole to the south to an angle where there is no shadow. That angle should be your latitude. The shadow length of a north/south facing wall will be pretty much constant all day.

 

We start with a marine layer this morning, but no major Santa Ana events or early Pacific storms are in the forecast.

[Guest happ]

Surprised a bit by the warm up today

 

90/ 64

[Anti Marine Layer]

Fall is officially here. Today was a hot day. Tomorrow should be a little bit cooler.

[Thunder98]

The WC has some showers in the forecast. I hope that means it will actually happen.

 

[Guest happ]

Pleasant day

 

85/ 65

[Anti Marine Layer]

Low clouds look quite thick this morning. It will definitely feel like fall today.

[Anti Marine Layer]

Fullerton may miss 80 F for first time since June. Welcome to a new season.

[Guest happ]

Coolest day this month. 

 

81/ 62

 

Not sure if this map is accurate since September seems to be cooler than average in SoCal

 

https://twitter.com/commoditywx

[Guest happ]

Is that map for September 2018 month-to-date?  The HPRCC map has a little finer resolution, but the same general pattern:

 

 

No, it was from a few days ago. Your map is up-to-date.

[Guest happ]

Dark low clouds this morning.

 

L: 62

[Guest happ]

Just be prepared for disappointment but early October rainfall has occurred in past years

[Guest happ]

First day below 80F since 6/23. 

 

78/ 62

[Guest happ]

All eyes on Rosa but where she enters the western US is anyone's/ any model's guess.   

 

L: 60

[TT-SEA]

All eyes on Rosa but where she enters the western US is anyone's/ any model's guess.

 

L: 60

I remember remember Nora in 1997 in San Diego... we got 2 or 3 inches of rain from that.

 

It was also the first rain event in a crazy wet winter!

[Guest happ]

I remember remember Nora in 1997 in San Diego... we got 2 or 3 inches of rain from that.

 

It was also the first rain event in a crazy wet winter!

 

I don't remember Nora; maybe LA didn't get much rain. 

[TT-SEA]

I don't remember Nora; maybe LA didn't get much rain.

Think it went through Yuma... but San Diego got the west side of the storm.

[Guest happ]

Think it went through Yuma... but San Diego got the west side of the storm.

 

Per latest model, Rosa could take the same route but mostly east toward Arizona 

[Guest happ]

https://twitter.com/ai6yrham

 

[Kayla]

https://twitter.com/ai6yrham

 

Some of the models show the remnant moisture from Rosa would likely be snowfall for Montana. Very intriguing pattern throughout the interior west that's for sure.

[Anti Marine Layer]

Marine layer still very slow to burn off today. I doubt tomorrow's forecast highs will be reached.

[Guest happ]

It felt muggy today and could get a whole lot more humid if Rosa moves closer but that is looking doubtful. 

 

88/ 63

[Thunder98]

Likely showers on Tuesday!

 

[Anti Marine Layer]

Similar marine layer pattern to July 4th today.

 

[Guest happ]

The anxiety over Rosa is painful. Of-course most want the beneficial rainfall and worry that it will miss us totally. That's the woe of living in SoCal 

 

Friday: 85/ 64

[Thunder98]

1st significant storm of the season!

 

[Guest happ]

This is very encouraging: 

 

NWS_LA

"If the GFS is the better model, expect moderate to
locally heavy showers to begin Tuesday morning across the Central
Coast. As the front begins to move through Point Conception, the
front begins to slow down and pick up some juicy moisture which
could bring some heavy rain to both SBA and Ventura Counties. The
European and NAM-WRF also bring in some prefrontal rain to these
areas, but much weaker initially. The bottom line is confidence
remains low on the timing of this relatively strong system this
early in the season. But it is becoming more clear that there will
be plenty of moisture to tap into and with some instability in the
atmosphere, a chance of thunderstorms could occur bringing
locally heavy rain at times in and around the cold front. The EC
model delays the heavier rain until early Wednesday morning for
the SBA/Ventura County areas. People affected in or below recent
burn areas should keep a close watch on the latest forecasts due
to the potential for heavy rain. If the models remain consistent
with the strength of this storm, a flash flood watch might be
needed for the recent burn areas from SBA Counties and Ventura
Counties, and possibly L.A. County."