NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
>From: mljacobs <address@hidden> >Organization: UCAR/Unidata >Keywords: 200309102217.h8AMHeLd023414 >Hello, >I was wondering if there is a way to get a rainfall rate from using the >difference in 1-hour precip. in GEMPAK. The files are updated every 6 min. >Resulting in the amount of rainfall in 6 minutes. I have the level III radar >data from NCDC. >Am I going about this the right way or do you have another suggestion? >Thanks for your time >Matt Jacobs (KU) > Matt, The NIDS Level III products are 16 value images and not actual data values. The 16 values therefore represent a range of precipitation values, so trying to do mathematical differencing is not likely to be accurate. The products are generated from the PUP using Z to R relationships assuming a droplet size distribution), so you can use the reflectivity product (again these are 16 binned data values) as an approximation to instantaneous rainfall rate. Otherwise, you would have to do a Z to R conversion from level 2 data values. Steve Chiswell