Transitioning the SHERB into AWIPS D2D and GFE

awips.sherb

Example display of the SHERB parameter in the AWIPS D2D display.

sherb.gfe

Example display of the SHERB parameter in GFE.

One of the key outcomes of a recent Collaborative Science, Technology, and Applied Research (CSTAR) project is a new experimental parameter (SHERB) geared toward identifying the potential for tornadoes and significant severe wind events in High Shear Low CAPE (HSLC) environments. HSLC conditions are defined as MLCAPE < 1000 J/kg and 0-6 km shear >= 35 kts.

The SHERB parameter is a product of the 0-3 km shear magnitude, the 0-3 km lapse rate, and the 700-500 hPa lapse rate, with both lapse rates normalized by their optimal values (i.e., where they most skillfully discriminate between HSLC significant severe convection and nulls) and the 0-3 km shear magnitude normalized such that the optimal threshold for the SHERB is a value of 1. In other words, the potential for significant severe convection increases when the SHERB is above 1 in HSLC environments.

The SHERB, in particular, is very skillful when dealing with surface-based, low LCL HSLC convection, including the majority of HSLC significant tornado events in the Southeastern U.S. The majority of HSLC significant severe reports occurred with SHERB values over 1.  More details about the SHERB are available in a presentation at the following URL: http://www4.ncsu.edu/~nwsfo/storage/workshops/20121116.sherburn_cstar_111412.pptx

Thanks to efforts by Keith Sherburn and Dr Mathew Parker at NC State, along with Harry Gerapetritis and Dan Baumgardt, the SHERB is now available for forecasters to use in D2D and GFE. To assist forecasters, the SHERB parameter can be added to the AWIPS-1 volume browser and viewed in D2D. In addition, the SHERB parameter has been encoded into a GFE smart tool called SHERB that is available for both AWIPS-1 and AWIPS-2 locations. The instructions and code for installing the SHERB in D2D and GFE have been added and officially accepted on the NWS Software Collaboration Portal (SCP).

AWIPS-1 Volume Browser addition
https://collaborate.nws.noaa.gov/trac/nwsscp/wiki/AppsAwips/Sherb
AWIPS-1 and AWIPS-2 GFE tool
https://collaborate.nws.noaa.gov/trac/nwsscp/wiki/Gfe/Smarttools/Sherb

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3 Responses to Transitioning the SHERB into AWIPS D2D and GFE

  1. Paul Sisson says:

    Great work! What is the date of your Northeast example above?

  2. Jonathan Blaes @ WFO RAH says:

    Hey Paul, thanks for the note. The Northeast example above is a bit of a manufactured/mis-applied case to provide some good eye-candy. It is based on yesterday’s event which wasn’t a HSLC case so it isn’t a true event. I did not have a legit event that I was able to grab with a screen capture during the past couple of weeks.

    Note that we are developing a couple of training activities including a webinar with the WDTB to more formally present this parameter including its development and how to properly use it.

  3. Jonathan Blaes @ WFO RAH says:

    There are several other activities in progress to provide more information on the SHERB. We are developing a couple of training activities including a webinar with the WDTB to more formally present this parameter including its development and how to properly use it. An article for Weather and Forecasting that more rigorously describes the SHERB is in final review. We are also working with the SPC to get the parameter added to the mesoscale analysis page.

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