diff --git a/bin/weewx/VantagePro.py b/bin/weewx/VantagePro.py
index 399a10a2..512cfa82 100644
--- a/bin/weewx/VantagePro.py
+++ b/bin/weewx/VantagePro.py
@@ -221,6 +221,8 @@ class VantagePro (object) :
                             # be unused records, which are filled with 0xff:
                             if _page[1+52*_index:53+52*_index] == 52*chr(0xff) :
                                 # This record has never been used. We're done.
+                                syslog.syslog(syslog.LOG_DEBUG, "VantagePro: empty record page %d; index %d" \
+                                              % (unused_ipage, _index))
                                 return
                             # Unpack the raw archive packet:
                             _packet = unpackArchivePacket(_page[1+52*_index:53+52*_index])
@@ -239,6 +241,10 @@ class VantagePro (object) :
                             # decline up to the DST delta.
                             if _record['dateTime'] is None or _record['dateTime'] + self.dst_delta <= _last_good_ts :
                                 # The time stamp is declining. We're done.
+                                syslog.syslog(syslog.LOG_DEBUG, "VantagePro: time stamps declining. Record timestamp %s" \
+                                              % weeutil.weeutil.timestamp_to_string(_record['dateTime']))
+                                syslog.syslog(syslog.LOG_DEBUG, "      ****  Last good timestamp %s" \
+                                              % weeutil.weeutil.timestamp_to_string(_last_good_ts))
                                 return
                             # Augment the record with the data from the accumulators:
                             self.archiveAccumulators(_record)