diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 5ffad9d..8315a65 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -440,6 +440,12 @@ class RAOBObs():
         while i < len(self.tokens):
             prefix = self.tokens[i][0:2]
 
+            #
+            # Stop parsing at the tropopause.
+            #
+            if prefix == '88':
+                break
+
             if prefix in self.PRESSURE_CODES:
                 samples.append(self.parse_ttbb_sample(self.tokens[i:i+2]))