I am new to using VAPOR and I am trying to use WRF in tandem with VAPOR to produce images showing temperature distributions surrounding an urban area (using the urban canopy option in WRF). In preparation for this end goal I have been exploring the VAPOR interface using some wrfout files. However, I have noticed that when I plot temperature (variable T), in the appearance tab it is showing data values ranging from around -3 to 187. I am struggling to comprehend why VAPOR is outputting temperatures like this. What units is it outputting the values in? I would assume Kelvin, but obviously negative temperatures are not possible in Kelvin and this range doesn’t make sense in any other common unit systems. Does WRF shift the data in some way that I should be aware of? Any help would be appreciated. Thanks.
Thanks for your willingness to help. I have plotted two seperate data sets, one from a personal WRF run, and a datset from a tutorial that is on VAPOR’s Youtube channel (I am just getting started in VAPOR). In both runs I observed strange temperature values being plotted. Using the dataset found at tutorialData_Mar17 - Google Drive (this was the data provided by Scott Pearse in the youtube tutorial found at 2021 CISL Vapor Tutorial - YouTube ) I plotted an iso surface of pressure, colormapped by temperature. When I show the color scale it is showing temperatures that do not make sense as you can see from the attached image. Any ideas as to why this is happening would be appreciated. Thanks.
Joseph, you’re correct that the min temperature in those files goes below zero, and the units are in kelvin. Your guess is as good as mine as to why this is happening, but the people over at the WRF Support Forum may have insight.
Like John said, Vapor isn’t modifying the data values unless you compress the data. This isn’t the case here.
Hope that helps. Good luck and let us know if you have any more questions.
