diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index c1c8dc9..180e92d 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -370,6 +370,9 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
+        if self.tokens[2] == 'MISDA':
+            return None
+
         sample = self.parse_ttaa_sample(self.tokens[2:5])
         samples.append(sample)
 
@@ -415,7 +418,7 @@ class RAOBObs():
             'dewpoint': None
         }
 
-        if len(tokens) > 1:
+        if len(tokens) > 1 and len(tokens[1]) == 5:
             td = self.parse_temp_dewpoint(tokens[1])
             ret['temp']     = td.get('temp')
             ret['dewpoint'] = td.get('dewpoint')
@@ -427,6 +430,12 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
+        if len(self.tokens) < 5:
+            return None
+
+        if self.tokens[2] == 'MISDA':
+            return None
+
         sample = self.parse_ttbb_sample(self.tokens[2:4])
         samples.append(sample)
 
@@ -481,6 +490,12 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
+        if len(self.tokens) < 7:
+            return None
+
+        if self.tokens[2] == 'MISDA':
+            return None
+
         for i in range(2, len(self.tokens), 4):
             data = self.parse_ppbb_samples(self.tokens[i:i+4])