The HMS compute dialog does not always generate when using an MetVue model as input. The model will still be computed, the progress bar will stay at 0% compute and then be complete (https://discourse.hecdev.net/t/hms-messages-not-showing-when-computed-along-with-metvue/1917/4).


Upgrading to HEC-HMS version 4.9 changes the dialog for broken file location(s) (normally DSS files). In prior versions, the user would be prompted per each missing DSS file but now HEC-HMS version 4.9 has implemented a Global File Reference Table. This allows for all broken links to be viewed and changed within a single interface. Unlike the prior version, having broken links in HMS will not stall the CAVI if the prompt is not noticed by the user. However, there is now a HMS icon on the task bar that should be pulsating to try to alert the user to the Global File Reference Table. If not noticed, the HMS compute will most likely fail due to missing data. The user will then have to fix the broken file references in the model.


If referenced files are within the HMS folder of the project, the files are written in a relative form, so they should not break if moved from one computer to the next. Missing file references typically occur when file references are made external to the HEC-HMS project. This practice is discouraged, and it is good practice to keep all files references for the HMS model within the HMS project folder.

If trying to utilize HMS 4.10, temperature grids will not be generated from MFP. If wanting temperature grids for the HMS model, please use MetVue.