diff --git a/swash/processing/swash.py b/swash/processing/swash.py
index e4f58d7..0493c64 100644
--- a/swash/processing/swash.py
+++ b/swash/processing/swash.py
@@ -1,3 +1,6 @@
+import logging
+import sys
+import argparse
 import pathlib
 import subprocess
 import configparser
@@ -5,24 +8,41 @@ import shutil
 import tempfile
 
 
+parser = argparse.ArgumentParser(description="Run swash model")
+parser.add_argument("-v", "--verbose", action="count", default=0)
+args = parser.parse_args()
+
+logging.basicConfig(level=max((10, 20 - 10 * args.verbose)))
+log = logging.getLogger("swash")
+
+log.info("Starting swash model")
 config = configparser.ConfigParser()
 config.read("config.ini")
 
 inp = pathlib.Path(config.get("swash", "input"))
 out = pathlib.Path(config.get("swash", "out"))
+if out.exists():
+    log.error(f"Swash output '{out}' already exists")
+    sys.exit(1)
 
 with tempfile.TemporaryDirectory(prefix="swash_", dir=".") as tmp_raw:
     tmpdir = pathlib.Path(tmp_raw)
 
+    log.info(f"Copying files to '{tmpdir}'")
     shutil.copy2(inp, tmpdir)
     shutil.copytree(
         pathlib.Path(config.get("data", "out")), tmpdir, dirs_exist_ok=True
     )
+    with open(tmpdir.joinpath("sws.log"), "w") as logfile:
+        log.info(f"Runing swash in '{tmpdir}'")
+        subprocess.run(
+            (config.get("swash", "swashrun"), "-input", inp.name),
+            cwd=tmpdir,
+            stdout=logfile,
+            stderr=logfile,
+        )
 
-    subprocess.run(
-        (config.get("swash", "swashrun"), "-input", inp.name), cwd=tmpdir
-    )
-
-    if out.exists():
-        shutil.rmtree(out)
+    log.info(f"Moving swash output to '{out}'")
     shutil.move(tmpdir, out)
+
+log.info(f"Swash model finished successfully")