diff --git a/pkgs/additional/sane-weather/sane-weather b/pkgs/additional/sane-weather/sane-weather
index 84a84469..11a347e7 100755
--- a/pkgs/additional/sane-weather/sane-weather
+++ b/pkgs/additional/sane-weather/sane-weather
@@ -39,6 +39,9 @@ class QueryOp:
 class PrintTempOp:
     pass
 
+class DiagnosticsOp:
+    pass
+
 class ExitOp:
     pass
 
@@ -66,8 +69,14 @@ class TopLevel:
             if temp is not None:
                 del self.work_queue[0]
                 print(f"{int(temp)} C")
+        elif isinstance(work, DiagnosticsOp):
+            del self.work_queue[0]
+            # GWeather does transparent caching so that we don't usually hit the web
+            last_update = self.source.info.get_update()
+            logger.debug(f"last update: {last_update}")
         elif isinstance(work, ExitOp):
             logger.debug("quitting GLib MainLoop")
+            self.source.info.store_cache()
             self._loop.quit()
         else:
             assert False, f"unknown work: {work}"
@@ -79,27 +88,32 @@ def main():
     logging.basicConfig()
 
     parser = argparse.ArgumentParser(description="acquire weather information for user display")
-    parser.add_argument('--interactive', action='store_true', help='drop into a REPL instead of doing anything, for debugging')
-    parser.add_argument('--verbose', action='store_true', help='enable verbose logging')  #< only applies immediately to this app; use `G_MESSAGES_DEBUG=all` for more verbosity
+    parser.add_argument('--break-before', action='store_true', help='drop into a REPL before do anything (for debugging)')
+    parser.add_argument('--break-after', action='store_true', help='drop into a REPL after completing the work (for debugging)')
+    parser.add_argument('--verbose', action='store_true', help='enable verbose logging')
 
     args = parser.parse_args()
 
     if args.verbose:
         logger.setLevel(logging.DEBUG)
+        GLib.log_set_debug_enabled(True)
 
     toplevel = TopLevel()
     # for now, hardcoded; four-letter station code is that from METAR:
     # - <https://aviationweather.gov/metar>
     here = GWeather.Location.find_by_station_code(toplevel.source.world, 'KSEA')
 
-    if args.interactive:
+    if args.break_before:
         code.interact(local=dict(**globals(), **locals()))
-        return
 
     toplevel.enqueue(QueryOp(here))
     toplevel.enqueue(PrintTempOp())
+    toplevel.enqueue(DiagnosticsOp())
     toplevel.run()
 
+    if args.break_after:
+        code.interact(local=dict(**globals(), **locals()))
+
 
 if __name__ == '__main__':
     main()