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This is pretty neat. Wonder if they're using some data catalog under the covers for the search screen or is it all custom built.

It looks like ArcGIS, which is what my city of Halifax, NS also uses: https://catalogue-hrm.opendata.arcgis.com/

It is ArcGIS. Here is their Emergency Operations Center overlay:

You get used to refreshing this page during down-slope, windy, red flag days.

Looks like that one is using https://hub.arcgis.com/

Another common platform for these is https://dev.socrata.com