Author Topic: Outflow boundaries on GRL3 (Read 21904 times)

Downlinerz2 · « **on:** July 26, 2009, 09:55:26 PM »

I have heard a lot about outflow boundaries and storms forming along the outflow boundaries of earlier storms. Can these boundaries be seen on GRL3 and what would it look like?

Would they be more visible on TDWR sites or can they be seen on all types of radar? Thanks for your help!! $\:D/$ It is much appreciated. I don't know where I would be without all the excellent help I have been given on this forum.

Mark

Mark / Ohio · « **Reply #1 on:** July 26, 2009, 10:25:47 PM »

Yes, you can see them on GRL3. They start as a thin line which shows up as very light precip often ahead of storms that are starting to collapse. I normally can see them best using BR1 or CR. I've also seen them using the TWDR radars. Sometimes they almost could pass for ground clutter in the early stage but when adding motion you can see movement to them.

ncpilot · « **Reply #2 on:** July 26, 2009, 11:09:33 PM »

See them all the time here, plus you can see the sea breeze line...

WeatherHost · « **Reply #3 on:** July 26, 2009, 11:16:32 PM »

I thought I had a good screen cap of one, but I can't find it now. Look for an arc of blue/green echoes moving out ahead of the storm.

Downlinerz2 · « **Reply #4 on:** July 26, 2009, 11:31:12 PM »

Mark, Marc, and WeatherHost
Thanks very much for the excellent replies!!

I am going to be searching everywhere now for these outflow boundaries. And that will probably lead me to more questions for the forum. Thanks again! You are all the best!!!

Mark

ncpilot · « **Reply #5 on:** July 27, 2009, 10:02:01 AM »

I got to thinking abot whether the local terrain/geography affects how easily an outflow boundary can be seen.

Being coastal here, we are of course flat, so there are no barriers to an outflow--maybe why it's easy to see?

Downlinerz2 · « **Reply #6 on:** July 27, 2009, 10:09:38 AM »

Marc,
Interesting question. It is flat here in NW Ohio also so I hope that will make it easier.
Thanks for posting it!
Mark

ocala · « **Reply #7 on:** July 28, 2009, 01:18:34 PM »

Mark go to this site.
http://www.aprsfl.net/radar/index.php?site=KTBW&mode=dz&animated=no
It has all the radar sites in Florida. We have a pretty soupy air mass today and the storms are starting to fire.
Use the animation option and as the day goes on you will see the outflow boundaries form.
Keep in mind that beyond a certain point the radar cannot pick them up. Try switching radar sites to the boundaries that are closest.
You will see what looks like small circular or semi straight lines moving away from the parent storm. These are the outflows. You can watch and see how they crash into other boundaries and form more storms.
Kind of like atmospheric chaos.

Downlinerz2 · « **Reply #8 on:** July 28, 2009, 02:30:23 PM »

Thanks for the heads-up Ocala

$\:D/$ !! I am going to do that! Nothing like watching the action live

!!
Mark

ncpilot · « **Reply #9 on:** July 28, 2009, 03:28:26 PM »

Go NOW to check out outflow boundaries: 3:28pm EDT

http://radar.weather.gov/radar_lite.php?rid=ltx&product=N0R&loop=yes

(look down towards Myrtle Beach, north westward heading outflow)

WeatherHost · « **Reply #10 on:** July 29, 2009, 04:50:34 PM »

I was just bopping around the country and stumbled across this. I haven't studied the motion, so I won't commit to this being an OFB, but this is the type of thing to look for. Note the arc between Pueblo and Fremont.

ocala · « **Reply #11 on:** July 29, 2009, 06:48:17 PM »

This is from yesterday. I think you can pick it out going through Tampa.

WeatherBeacon · « **Reply #12 on:** July 29, 2009, 06:54:04 PM »

There's two of them RIGHT NOW (at 5:53 CDT) about to clash head on at Shreveport (KSHV)!

Downlinerz2 · « **Reply #13 on:** July 29, 2009, 07:08:03 PM »

Quote from: ocala on July 29, 2009, 06:48:17 PM

This is from yesterday. I think you can pick it out going through Tampa.

Yes I do see that one. thanks for posting the picture.

Downlinerz2 · « **Reply #14 on:** July 29, 2009, 07:19:36 PM »

Quote from: WeatherBeacon on July 29, 2009, 06:54:04 PM

There's two of them RIGHT NOW (at 5:53 CDT) about to clash head on at Shreveport (KSHV)!

I think I missed those. Would the color table being used make a difference?
I was using AMJDbarron. I am going to try the AdvantageHD. Thanks for the heads up!!

WeatherBeacon · « **Reply #15 on:** July 29, 2009, 07:24:18 PM »

Quote from: Downlinerz2 on July 29, 2009, 07:19:36 PM

Quote from: WeatherBeacon on July 29, 2009, 06:54:04 PM

There's two of them RIGHT NOW (at 5:53 CDT) about to clash head on at Shreveport (KSHV)!
I think I missed those. Would the color table being used make a difference?
I was using AMJDbarron. I am going to try the AdvantageHD. Thanks for the heads up!!

I'm using Aegisglowingreflectivity.

They're hitting about right now (6:25CDT). I'm still watching it. Use Polling in BR1 and you'll be able to see it. They're colliding head on right at the radar itself.

Kevin...

Downlinerz2 · « **Reply #16 on:** July 29, 2009, 07:28:02 PM »

Is it the greenish band by Greenwood?

WeatherBeacon · « **Reply #17 on:** July 29, 2009, 07:31:17 PM »

Quote from: Downlinerz2 on July 29, 2009, 07:28:02 PM

Is it the greenish band by Greenwood?

Go to the KSHV radar. They're colliding right at the radar at this moment. They may now be too close to the radar for the radar to detect them. Let's see what happens after they collide. If you using Polling you'll get the previous 20(?) images and you'll see it.

Downlinerz2 · « **Reply #18 on:** July 29, 2009, 07:37:33 PM »

Quote from: WeatherBeacon on July 29, 2009, 07:31:17 PM

Quote from: Downlinerz2 on July 29, 2009, 07:28:02 PM
Is it the greenish band by Greenwood?
Go to the KSHV radar. They're colliding right at the radar at this moment. They may now be too close to the radar for the radar to detect them. Let's see what happens after they collide. If you using Polling you'll get the previous 20(?) images and you'll see it.

Kevin thanks so much. I do see them when I went back to earlier images. One starts at Marshall and goes clean across to the NE of the radar site. the other is around Forbing and Sligo! They are very obvious (I hope I am seeing the right thing) but I think I am!

$\:D/$ Thanks again Kevin!!

Downlinerz2 · « **Reply #19 on:** July 29, 2009, 07:40:35 PM »

OH WOW!! Yes that is what I have been looking for. As I run the frames forward you can see them colliding at the radar site. Does that kind of thing happen very often?
Thanks to you all!!! Very neat!!!

$\:D/$
Mark

Edit: Another question. Are those the outflows from cell D5 and U7?

WeatherBeacon · « **Reply #20 on:** July 29, 2009, 07:48:14 PM »

Here it is at 5:41 EDT:

WeatherBeacon · « **Reply #21 on:** July 29, 2009, 07:56:42 PM »

Quote from: Downlinerz2 on July 29, 2009, 07:40:35 PM

OH WOW!! Yes that is what I have been looking for. As I run the frames forward you can see them colliding at the radar site. Does that kind of thing happen very often?
Thanks to you all!!! Very neat!!! $\:D/$
Mark

Edit: Another question. Are those the outflows from cell D5 and U7?

I can't tell where they originated.

Also, I don't know if they're outflow boundaries or derechoes. I need to study up on the differences between those two things. Pretty cool, though, eh?

WeatherBeacon · « **Reply #22 on:** July 29, 2009, 07:58:26 PM »

Wow! I don't know if it's a coincidence or not, but as they collided, storms exploded.

WeatherHost · « **Reply #23 on:** July 29, 2009, 08:07:38 PM »

That's not coincidence. It happens fairly often.

A Derecho is something else, more of an intense bow echo across a wider area. They can travel hundreds of miles across several states.

OFBs can happen from most intense storms, but don't always appear. It depends on how fast the storm falls apart as far as I understand.

mackbig · « **Reply #24 on:** July 29, 2009, 08:08:56 PM »

What does "use Polling" mean? (how is it done)

Thanks,
Andrew

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Author Topic: Outflow boundaries on GRL3 (Read 21904 times)