[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IDV #QFA-841207]: Storm_relative Helicity@ layer between two levels using RUC data

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [IDV #QFA-841207]: Storm_relative Helicity@ layer between two levels using RUC data
  • Date: Fri, 24 Apr 2009 12:31:17 -0600
Hi Jay-

> Full Name: Jay Martinelli
> Email Address: address@hidden
> Organization: Creighton University
> Package Version: 2.6u1 build date:2009-01-29 22:02 UTC
> Operating System: Windows XP
> Hardware: Java: home: C:\Program Files\IDV_2.6u1\jre version: 1.6.0_11 
> j3d:1.5.2 fcs (build4)
> Description of problem: Hello,
> 
> I am trying to display 0-3 km SRH using the SRH between two levels function.  
> However, it only allows me to display what I presume is 0-500 m. Is this a 
> known issue or is it operator error!
> 
> I am using ruc 252 data valid 2008010722f01 data.

Thanks for the file.

In this file there are two SRH fields - surface and layer between 2 heights.  
The
latter is 0-1000m and the level gets set (rightly or wrongly) to 500 (as the 
average level)
when you display it. Subtracting the two (e.g. sub(a,b)) would give you the 
difference 
between the layer SRH and the surface SRH.  

The layer difference expects a 3D grid that then gets sliced at the appropriate 
levels.
In this case, you only have 2 (essentially) 2D grids.

Hope that helps!

Don Murray

Ticket Details
===================
Ticket ID: QFA-841207
Department: Support IDV
Priority: Normal
Status: Open