• After witnessing the continued decrease of involvement in the SpotterNetwork staff in serving SN members with troubleshooting issues recently, I have unilaterally decided to terminate the relationship between SpotterNetwork's support and Stormtrack. I have witnessed multiple users unable to receive support weeks after initiating help threads on the forum. I find this lack of response from SpotterNetwork officials disappointing and a failure to hold up their end of the agreement that was made years ago, before I took over management of this site. In my opinion, having Stormtrack users sit and wait for so long to receive help on SpotterNetwork issues on the Stormtrack forums reflects poorly not only on SpotterNetwork, but on Stormtrack and (by association) me as well. Since the issue has not been satisfactorily addressed, I no longer wish for the Stormtrack forum to be associated with SpotterNetwork.

    I apologize to those who continue to have issues with the service and continue to see their issues left unaddressed. Please understand that the connection between ST and SN was put in place long before I had any say over it. But now that I am the "captain of this ship," it is within my right (nay, duty) to make adjustments as I see necessary. Ending this relationship is such an adjustment.

    For those who continue to need help, I recommend navigating a web browswer to SpotterNetwork's About page, and seeking the individuals listed on that page for all further inquiries about SpotterNetwork.

    From this moment forward, the SpotterNetwork sub-forum has been hidden/deleted and there will be no assurance that any SpotterNetwork issues brought up in any of Stormtrack's other sub-forums will be addressed. Do not rely on Stormtrack for help with SpotterNetwork issues.

    Sincerely, Jeff D.

GRevel3 Hail indicator

Joined
Jan 8, 2005
Messages
794
Location
Huntsville, Alabama
Interesting--I had just come out of the grocery in Huntsville and saw the approaching cb with nicely shaped precip shaft. The core lay right on my path back home, so a 'punch' was required.

Good heavy rain, strong winds, and hail up to about 3/4" (most was pea size) and inundated streets were the result. One frightened driver actually blocked traffic by stopping under a tree to protect her new-looking car, then ran a red light to esape the 'threat' to her new finish.

When I arrived home, I booted up GRL3 to watch. No hail indicator showed up until it was well past my location. Even trying to figure in the five minute delay, it seems like it was off a couple miles.

I guess the margin of error is to be expected?
 
It's not running GR algorithms, that just displays the NWS 88D hail output. You'll find much better results with the GR2AE output.
 
The GR2AE gridded hail algorithm is the same HDA logic applied to the reflectivity profile at each grid point, rather than the vertical dBZ core in a storm cell. Both algorithms were developed at NSSL, Gibson adapted the gridded algorithm for GR2AE.
 
Also if you don't want to get GR2AE you can view the generated product on the web on NSSL's website at http://www.nmq.nssl.noaa.gov/. You'll have to go to Mosaic3D Derived and then select MEHS as the product.
One further note...the MESH grid available here, and on

http://wdssii.nssl.noaa.gov/geotiff_new/

Are based on gridded reflctivity profiles that are created by merging multiple radars. This provides a much more robust solution than a single-radar MESH, with storms being multiply-sampled, and cones-of-silence and far range storms being filled in by other radars.
 
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