diff --git a/justfile b/justfile
index 51f12e5..c466eb1 100644
--- a/justfile
+++ b/justfile
@@ -102,6 +102,26 @@ main-mb05 *more_args="":
 #                 --max-segments=5 \
 #                 --output-dir=/Volumes/PAM_Analysis/pypam-space/test_output \
 
+# Exercise program with `gs://` URIs
+main-google date='20200101' *more_args="--max-segments=5":
+    #!/usr/bin/env bash
+    WS=noaa-passive-bioacoustic_nrs_11_2019-2021
+    mkdir -p $WS/DOWNLOADS
+    mkdir -p $WS/OUTPUT
+    PYTHONPATH=. EXCLUDE_LOG_TIME=yes \
+        python src/main.py \
+                 --date={{date}} \
+                 --gs \
+                 --json-base-dir=$WS \
+                 --voltage-multiplier=1 \
+                 --sensitivity-flat-value=1 \
+                 --output-dir=$WS/OUTPUT \
+                 --output-prefix=NRS_ \
+                 --download-dir=$WS/DOWNLOADS \
+                 --retain-downloaded-files \
+                 {{more_args}}
+#                 --assume-downloaded-files \
+
 # Basic test for cloud processing
 main-cloud-basic-test max_segments="1" date="20220902":
     #!/usr/bin/env bash
diff --git a/src/file_helper.py b/src/file_helper.py
index 4eed1a8..edcde55 100644
--- a/src/file_helper.py
+++ b/src/file_helper.py
@@ -35,9 +35,10 @@ def __init__(
         audio_base_dir: Optional[str],
         audio_path_map_prefix: str,
         audio_path_prefix: str,
-        s3_client: Optional[BaseClient],
         download_dir: Optional[str],
         assume_downloaded_files: bool,
+        s3_client: Optional[BaseClient] = None,
+        gs_client: Optional[GsClient] = None,
     ):
         self.logger = logger
 
@@ -47,6 +48,7 @@ def __init__(
         self.audio_base_dir = audio_base_dir
         self.audio_path_prefix = audio_path_prefix
         self.s3_client = s3_client
+        self.gs_client = gs_client
         self.download_dir: str = download_dir if download_dir else "."
         self.assume_downloaded_files = assume_downloaded_files
 
@@ -83,6 +85,7 @@ def _get_sound_filename(self) -> Optional[str]:
                 self.download_dir,
                 self.assume_downloaded_files,
                 self.s3_client,
+                self.gs_client,
             )
 
         # otherwise assuming local file, so we only inspect the `path` attribute:
@@ -99,7 +102,9 @@ def remove_downloaded_file(self):
         if not pathlib.Path(self.sound_filename).exists():
             return
 
-        if self.s3_client is None or self.parsed_uri.scheme != "s3":
+        if (
+            self.s3_client is None and self.gs_client is None
+        ) or self.parsed_uri.scheme not in ("s3", "gs"):
             self.logger.debug(f"No file download involved for {self.uri=}")
             return
 
@@ -294,6 +299,7 @@ def get_local_filename(self, uri: Optional[str]) -> Optional[str]:
                 self.download_dir,
                 self.assume_downloaded_files,
                 self.s3_client,
+                self.gs_client,
             )
 
         return parsed_uri.path
@@ -337,6 +343,7 @@ def _get_json_s3(self, parsed_uri: ParseResult) -> Optional[str]:
             self.download_dir,
             self.assume_downloaded_files,
             self.s3_client,
+            self.gs_client,
         )
         if local_filename is None:
             return None
@@ -467,9 +474,10 @@ def _get_sound_status(self, uri: str) -> SoundStatus:
                 audio_base_dir=self.audio_base_dir,
                 audio_path_map_prefix=self.audio_path_map_prefix,
                 audio_path_prefix=self.audio_path_prefix,
-                s3_client=self.s3_client,
                 download_dir=self.download_dir,
                 assume_downloaded_files=self.assume_downloaded_files,
+                s3_client=self.s3_client,
+                gs_client=self.gs_client,
             )
             self.sound_cache[uri] = ss
         else:
diff --git a/src/json_support.py b/src/json_support.py
index 1d28e88..763cb76 100644
--- a/src/json_support.py
+++ b/src/json_support.py
@@ -72,6 +72,8 @@ def get_intersecting_entries(
     Gets the list of intersecting entries for the UTC "start minute"
     given by (year, month, day, at_hour, at_minute).
 
+    :param logger:
+        The logger to be used
     :param json_entries:
         JSON entries for the day
     :param year:
@@ -90,6 +92,12 @@ def get_intersecting_entries(
     :return:
         The list of intersecting entries
     """
+    # for logging purposes:
+    time_spec = (
+        f"year={year} month={month} day={day} at_hour={at_hour} at_minute={at_minute}"
+    )
+    logger.debug(f"get_intersecting_entries: {time_spec} {len(json_entries)=}")
+
     # the requested start minute as datetime:
     dt = datetime(year, month, day, at_hour, at_minute, tzinfo=timezone.utc)
     # the start of the requested start minute in seconds:
@@ -116,14 +124,14 @@ def get_intersecting_entries(
             )
             tot_duration_secs += duration_secs
 
-    # for logging purposes:
-    time_spec = (
-        f"year={year} month={month} day={day} at_hour={at_hour} at_minute={at_minute}"
-    )
-
-    if logger.is_enabled_for(logging.DEBUG):
+    warning = 0 == len(intersecting_entries)
+    if warning or logger.is_enabled_for(logging.DEBUG):
         uris = [i.entry.uri for i in intersecting_entries]
         uris_str = "\n  ".join([f"[{e}] {uri}" for e, uri in enumerate(uris)])
-        logger.debug(f"{time_spec}: intersection uris({len(uris)}):\n  {uris_str}")
+        msg = f"{time_spec}: intersection uris({len(uris)}):\n  {uris_str}"
+        if warning:
+            logger.warn(msg)
+        else:
+            logger.debug(msg)
 
     return intersecting_entries
diff --git a/src/main.py b/src/main.py
index 10e964b..3772379 100644
--- a/src/main.py
+++ b/src/main.py
@@ -35,7 +35,7 @@ def main(opts):
         s3_client = boto3.client("s3", **kwargs)
 
     gs_client = None
-    if opts.s3:
+    if opts.gs:
         # pylint: disable=import-outside-toplevel
         from google.cloud.storage import Client as GsClient