GRLevel 3: New ICONS

[HAltschule]

What do they all mean? There are red, yellow and orange circles...some with dashed circular lines and some are circluar lines with arrows. Obviously, many mean they are MESO's by looking at the attributes but why the 2 or 3 different types of symbols indicating a MESO? Do they indicate likelihood or something like that?

Please explain if you know. Thanks.

 

[John Wetter]

NMD.

Info here:
Here are some online papers describing the NMD algorithm and its performance:
http://ams.allenpress.com/perlserv/?request=get-document&doi=10.1175%2F1520-0434(1998)013%3C0304%3ATNSSLM%3E2.0.CO%3B2
http://www.srh.noaa.gov/jan/research/WD ... SS_MDA.htm
http://nsstc.uah.edu/~tjones/Papers/Jones04_Meso.pdf
http://www.caps.ou.edu/reu/reu03/papers/Christy.pdf

Also, view the 1.40 update thread on the GRS owners forums. I won't link over to there simply because not everyone probably has a user as you have to be an owner...

-John

 

[Bob Schafer]

John, would you be able to answer the question without providing 6 hours of technical reading material to us dweebs?

 

[Jeff Snyder]

As (almost) always, the best resource is the GRx owners forum. In this particular case, see the "FAQ: Meso icons and their values" thread at http://www.grlevelx.com/owners/viewtopic.php?f=2&t=4191
. If any owner of GRx isn't a member of the Owners forum, I strongly suggest it since Mike gives extremely good product support, and you'll have access to the latest software updates/version... In fact, v1.42 of GRLevel3 was released earlier today.

 

[Dave Gallaher]

+1 on Jeff's recommendation. The link sets up the info perfectly. I am still not certain how the meso index works, as the only thing mentioned that I saw was 'strong would be above 3600' or something to that effect. However, I like the new shear markers overall. The dashed lines mean that shear is present equal to that particular color value, but not present all the way to the lowest tilt.

 

[John Wetter]

John, would you be able to answer the question without providing 6 hours of technical reading material to us dweebs?

Basically, it's more output from the Mesocyclone Detection Algorithm with more information.

 

[Bob Schafer]

Basically, it's more output from the Mesocyclone Detection Algorithm with more information.

Okay, basically, I was hoping for a reply along the lines of:

Yellow is weak
Orange is moderate
Red is strong

...which is probably true, ergo I don't need to know any more.

 

[Dave Gallaher]

Bob,

From the GRLx site:

Light green is very weak, green is week , yellow is moderate, red is strong, purple is extreme.

Hope you are enjoying Colorado.

 

[Fred Gossage]

To add to Dave's post above, dashed circles are mesocyclones with bases above 5,000 feet. Circles with arrow points have bases below 5,000 feet.