diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 6187a84..1009db4 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -334,6 +334,7 @@ class RAOBObs():
     def parse_ttaa_sample(self, tokens: list[str]) -> dict:
         if tokens[0][0:2] == '99':
             hp = self.parse_pressure(tokens[0])
+            hp['height'] = 0
         else:
             hp = self.parse_height_pressure(tokens[0])