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Hurricane Season - 91L - Flash Flood Warnings for S. LA, Worst Rain Moving out Later Today

Posted on 5/11/19 at 11:38 am
Posted by rds dc
Member since Jun 2008
19805 posts
Posted on 5/11/19 at 11:38 am



This post was edited on 6/6/19 at 8:57 am
Posted by soccerfüt
Location: A Series of Tubes
Member since May 2013
65528 posts
Posted on 5/11/19 at 11:40 am to
Posted by ike221
Loo A Vul
Member since Aug 2006
13695 posts
Posted on 5/11/19 at 11:48 am to
Hurricane moving up the Mississippi River drainage basin, that is already at a high level, could be devastating
This post was edited on 5/11/19 at 11:50 am
Posted by Tigerbait357
Member since Jun 2011
67865 posts
Posted on 5/11/19 at 11:50 am to
Posted by Jim Rockford
Member since May 2011
98133 posts
Posted on 5/11/19 at 11:57 am to
Just when Punta Cana was getting back on its feet.
Posted by upgrayedd
Lifting at Tobin's house
Member since Mar 2013
134843 posts
Posted on 5/11/19 at 12:01 pm to
This is Trump's fault, obviously
Posted by fishfighter
RIP
Member since Apr 2008
40026 posts
Posted on 5/11/19 at 12:01 pm to
So, should I cancel my trip to Fla on the 4th of July?
Posted by upgrayedd
Lifting at Tobin's house
Member since Mar 2013
134843 posts
Posted on 5/11/19 at 12:04 pm to
BR schools are already closing next week in anticipation
Posted by Legion of Doom
Old Metry
Member since Jan 2018
4974 posts
Posted on 5/11/19 at 12:04 pm to
Damn. rds doing work early this year
Posted by VolsOut4Harambe
Atlanta, GA
Member since Sep 2017
12856 posts
Posted on 5/11/19 at 1:07 pm to
Dafuq did I just read
Posted by Dire Wolf
bawcomville
Member since Sep 2008
36587 posts
Posted on 5/11/19 at 1:09 pm to
How will this effect the Georgia southern game?
Posted by Leon Spinks
Texas
Member since Aug 2016
2265 posts
Posted on 5/11/19 at 1:13 pm to
I thought hurricane season was over
Posted by JudgeHolden
Gila River
Member since Jan 2008
18566 posts
Posted on 5/11/19 at 1:16 pm to
quote:

Hurricane moving up the Mississippi River drainage basin, that is already at a high level, could be devastating


Thanks for the nightmare, baw.
Posted by PipelineBaw
TX
Member since Jan 2019
1422 posts
Posted on 5/11/19 at 1:19 pm to
quote:

I thought hurricane season was over

Posted by TigerstuckinMS
Member since Nov 2005
33687 posts
Posted on 5/11/19 at 1:33 pm to
I THINK I REMEMBER THIS!

Last year, I asked what the hell this means. The MJO is the Madden Julian Oscillation, which is a very large scale feature that sets up an area of better than average thunderstorm formation and an area of thunderstorm suppression roughly opposite each other on the planet. So, the rainy part of it would be over the Atlantic while the non-rainy part might be over the Pacific. It circles the Northern tropics in an Eastward direction about every month or two and it varies in strength up and down over time. When the MJO is strong and parts of the oscillation that are favorable for more thunderstorms is over a part of the planet where it is also favorable for cyclones to form, it can increase the chances a storm will form and when the part of the oscillation that suppresses thunderstorms is there, it can reduce the chances you'll see cyclones forming. Right now, the enhanced thunderstorm part of the oscillation is moving from the Western/Central Pacific toward the Western Caribbean and on to Africa.

The CAG is the Central American Gyre and is a temporary feature of a huge mass of slowly spinning air that sets up over... Central America. On the Eastern edge of the gyre, over the Gulf and Western Caribbean near... Central America, disturbances can form and will tend to move along the edge of the gyre toward the northern Gulf. The formation of this gyre is correlated to movement of the MJO toward the West coast of the Americas, which is what that "moving from 8-1-2" thing refers to. It doesn't form every time the oscillation approaches and the oscillation isn't there every time the gyre forms, but when the gyre does form, it's well correlated to the approach of the MJO.

Am I learning, rds dc?
This post was edited on 5/11/19 at 2:45 pm
Posted by Bigfishchoupique
Member since Jul 2017
8331 posts
Posted on 5/11/19 at 1:43 pm to
I was going to buy a sack of crawfish next weekend but I’m sure they will be too high by next week.
Posted by East Coast Band
Member since Nov 2010
62729 posts
Posted on 5/11/19 at 1:43 pm to
It's May now. No, no, no
Posted by Duke
Twin Lakes, CO
Member since Jan 2008
35606 posts
Posted on 5/11/19 at 1:49 pm to
quote:

Am I learning


Yes.
Posted by Miketheseventh
Member since Dec 2017
5709 posts
Posted on 5/11/19 at 1:50 pm to
Thanks for explaining because I didn’t have a clue what all that meant
Posted by TigerstuckinMS
Member since Nov 2005
33687 posts
Posted on 5/11/19 at 1:55 pm to
quote:

Thanks for explaining because I didn’t have a clue what all that meant

I've learned that these weather guys are REALLY into the jargon of the field because they all know what "Movement of the MJO through Phases 8,1,2" means, but explaining it takes paragraphs, so they use the jargon and the applicable charts and graphs in these threads to quickly get the information out to avoid writing novels. If you ask and aren't one of the "you don't know what you're talking about because a tornado didn't hit my house" assholes that come here trying to troll them, they're willing to explain it to you as best they can.

For instance, this chart

that rds posted when talking about moving from 8,1,2 is fairly simple. It is a quick way to show both where the rainy part of that MJO is and how strong it is. The farther the dots are from the center of the chart, the stronger the oscillation is. When the dots are in the circle, the oscillation is weak. When they start getting outside the circle, it's getting stronger and can influence weather more. The chart is divided into 8 "phases" that basically just correlate to the part of the planet the peak of the oscillation is over. You can read those rough locations around the outside of the chart. The bigger dot is the day the chart was made, and is marked with a 10 because the date of the chart is 5/10. You can see the earlier dates and see how it moved around the planet in the past. The green line and dots ahead of today show the official forecast based on the GEFS model ensemble's (which is noted in the top right corner of the chart) predictions of where it will be in the future. The spaghetti lines are very similar to a hurricane chart's spaghetti lines and represent what each individual model run of the ensemble is predicting.

The chart is showing that on 5/10, the peak was over the Western Pacific (phase 7, as seen on the edge of the graph) and is expected to move into the Western hemisphere and head to Africa (phases 8 & 1) over the next few weeks. As it moves over the next few weeks, it's expected to weaken some for a week or so, then begin strengthening again. Past the end of this chart, it will continue Eastward back into the Indian Ocean (phase 2). 8-1-2.

I think. It's taken me a couple of hurricane seasons to start picking up on some of the stuff that these guys are laying down, so there are definitely a lot of things that I'm still not understanding correctly or fully.
This post was edited on 5/11/19 at 2:48 pm
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