HOURLYPressureTendency is actually a categorical variable. From the NOAA LCD documentation:

Press. Tend: Pressure tendency (In general a 0 through 3 here indicates an increase in pressure over previous 3 hours and a 5 through 8 indicates a decrease over the previous 3 hours and 4 indicates no change during the previous 3 hours). See ISD Documentation (under Atmospheric-Pressure-Change) for f

In the web app the chars variable is set to 0 by default, not 100

Similar to https://github.com/IBM/MAX-Object-Detector/blob/master/demo.ipynb, which illustrates how to invoke the prediction endpoint and parse the results. (~ "notebook-based" swagger spec for a data scientist audience)