diff --git a/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/SMOSproc_main.py b/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/SMOSproc_main.py
index 19bb729..76c99c9 100644
--- a/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/SMOSproc_main.py
+++ b/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/SMOSproc_main.py
@@ -28,12 +28,24 @@
 TMP_NC_PATH               = config['tmp_nc_path']
 OUT_REG_PATH              = config['out_reg_path']
 
+
+try:
+    env_fail_fast = os.environ.get('FAIL_FAST').strip().lower()
+    fail_fast = env_fail_fast not in ['false']
+    logging.info(f"fail_fast is set to {fail_fast}.")
+
+except:
+    logging.info(f"fail_fast is not set. Executing code with default behavior.")
+    fail_fast = False
+
 def run_in_isolated_process(func, *args):
     """
     Runs a function in an isolated child process and waits for it to finish.
     This prevents memory leaks or state changes in external libraries from 
     affecting the main script.
     """
+    logging.info(f"Initiation of {func.__name__}.")
+
     p = multiprocessing.Process(target=func, args=args)
     p.start()
     p.join()
@@ -115,9 +127,12 @@ def main():
         try:
             ncflist = process_ee_to_nc(current_date)
         except RuntimeError as e:
-            logging.error(f"Halting processing for {date_str} due to error: {e}")
-            current_date += timedelta(days=1)
-            continue
+            logging.error(f"Halting processing for {date_str} due to error: {e} related to building nc file list")
+            if fail_fast:
+                sys.exit(1) 
+            else:
+                current_date += timedelta(days=1)
+                continue
 
         # Step 2: Preprocess NetCDF files into REG 
         for fnc in ncflist:
@@ -125,8 +140,12 @@ def main():
             try:
                 run_in_isolated_process(preprocess_nc, fnc, config)
             except RuntimeError as e:
-                logging.error(f"Skipping {fnc} due to error: {e}")
-                continue
+                if fail_fast:
+                    logging.error(f"Failure in preprocessing of {fnc} due to: {e}. Halting processing")
+                    sys.exit(1)
+                else:
+                    logging.error(f"Skipping {fnc} due to error: {e} in preprocessing of nc files")
+                    continue
 
             # Move processed file to 'to_delete'
             dest = os.path.join(TMP_NC_PATH, 'to_delete', os.path.basename(fnc))
@@ -140,18 +159,82 @@ def main():
         try:
             run_in_isolated_process(SCLF1C_reg2fit, OUT_REG_PATH, current_date, next_date, '_A')
         except RuntimeError as e:
-            logging.error(f"SCLF1C_reg2fit failed for Ascending (_A) on {date_str}: {e}")
+            if fail_fast:
+                logging.error(f"SCLF1C_reg2fit failed for Ascending (_A) on {date_str}: {e}. Exiting program.")
+                sys.exit(1)
+            else:
+                logging.error(f"SCLF1C_reg2fit failed for Ascending (_A) on {date_str}: {e}")
 
         logging.info("Running SCLF1C_reg2fit for Descending (_D)")
         try:
             run_in_isolated_process(SCLF1C_reg2fit, OUT_REG_PATH, current_date, next_date, '_D')
         except RuntimeError as e:
-            logging.error(f"SCLF1C_reg2fit failed for Descending (_D) on {date_str}: {e}")
+            if fail_fast:
+                logging.error(f"SCLF1C_reg2fit failed for Descending (_D) on {date_str}: {e}. Exiting program.")
+                sys.exit(1)
+            else:
+                logging.error(f"SCLF1C_reg2fit failed for Descending (_D) on {date_str}: {e}")
         
         logging.info(f"=== Completed processing to Tb40 for {date_str} ===")
         
         # Advance to the next day
         current_date += timedelta(days=1)
+    while current_date < end_time:
+        date_str = current_date.strftime('%Y%m%d')
+        logging.info(f"=== Starting processing for {date_str} ===")
+
+        # Step 1: Convert files to NetCDF
+        try:
+            ncflist = process_ee_to_nc(current_date)
+        except RuntimeError as e:
+            logging.error(f"Halting processing for {date_str} due to error: {e} related to building nc file list")
+
+            if fail_fast:
+                sys.exit(1)
+            else:
+                current_date += timedelta(days=1)
+                continue
+
+        # Step 2: Preprocess NetCDF files into REG
+        for fnc in ncflist:
+            logging.info(f"Preprocessing NC file: {fnc}")
+            try:
+                run_in_isolated_process(preprocess_nc, fnc, config)
+            except RuntimeError as e:
+                if fail_fast:
+                    logging.error(f"Failure in preprocessing of {fnc} due to: {e}. Halting processing")
+                    sys.exit(1)
+                else:
+                    logging.error(f"Skipping {fnc} due to error: {e} in preprocessing of nc files")
+                    continue
+
+            # Move processed file to 'to_delete'
+            dest = os.path.join(TMP_NC_PATH, 'to_delete', os.path.basename(fnc))
+            shutil.move(fnc, dest)
+            logging.info(f"Moved {fnc} to cleanup directory.")
+
+        # Step 3: Run REG to FIT processing for Ascending and Descending
+        next_date = current_date + timedelta(days=1)
+
+        logging.info("Running SCLF1C_reg2fit for Ascending (_A)")
+        try:
+            run_in_isolated_process(SCLF1C_reg2fit, OUT_REG_PATH, current_date, next_date, '_A')
+        except RuntimeError as e:
+            if fail_fast:
+                logging.error(f"SCLF1C_reg2fit failed for Ascending (_A) on {date_str}: {e}. Exiting program.")
+                sys.exit(1)
+            else:
+                logging.error(f"SCLF1C_reg2fit failed for Ascending (_A) on {date_str}: {e}")
+
+        logging.info("Running SCLF1C_reg2fit for Descending (_D)")
+        try:
+            run_in_isolated_process(SCLF1C_reg2fit, OUT_REG_PATH, current_date, next_date, '_D')
+        except RuntimeError as e:
+            if fail_fast:
+                logging.error(f"SCLF1C_reg2fit failed for Descending (_D) on {date_str}: {e}. Exiting program.")
+                sys.exit(1)
+            else:
+                logging.error(f"SCLF1C_reg2fit failed for Descending (_D) on {date_str}: {e}")
 
 
 if __name__ == '__main__':
diff --git a/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/modules.rc b/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/modules.rc
new file mode 100755
index 0000000..3ec1c0f
--- /dev/null
+++ b/GEOSldas_App/util/inputs/obs_preproc/SMOS_preproc/modules.rc
@@ -0,0 +1,2 @@
+#!/bin/bash
+module load python/GEOSpyD