diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 547dea0..5ffad9d 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -122,8 +122,12 @@ class RAOBSounding():
             return
 
         sample = self.sample_by_pressure(pressure)
-        sample.temp     = temp
-        sample.dewpoint = dewpoint
+
+        if sample.temp is None:
+            sample.temp = temp
+
+        if sample.dewpoint is None:
+            sample.dewpoint = dewpoint
 
     def record_wind_speed_dir(self,
                               pressure: float,
@@ -133,8 +137,12 @@ class RAOBSounding():
             return
 
         sample = self.sample_by_pressure(pressure)
-        sample.wind_speed = wind_speed
-        sample.wind_dir   = wind_dir
+
+        if sample.wind_speed is None:
+            sample.wind_speed = wind_speed
+
+        if sample.wind_dir is None:
+            sample.wind_dir = wind_dir
 
 class RAOBObs():
     DATA_SOURCE = 'UCAR'
@@ -313,9 +321,22 @@ class RAOBObs():
         code, pressure = token[0:2], token[2:5]
 
         if pressure != '///' and code in self.PRESSURE_CODES:
-            value = float(pressure)
+            p100 = pressure[0]
+            p10  = pressure[1]
+            p1   = pressure[2]
 
-            if value < 100:
+            value = 0.0
+
+            if p100 != '/':
+                value += 100.0 * int(p100)
+
+            if p10 != '/':
+                value += 10.0 * int(p10)
+
+            if p1 != '/':
+                value += int(p1)
+
+            if value < 100.0:
                 value += 1000.0
 
             ret['pressure'] = value
@@ -335,12 +356,12 @@ class RAOBObs():
         wind = self.parse_wind(tokens[2])
 
         return {
-            'pressure':   hp['pressure'],
-            'height':     hp['height'],
-            'temp':       td['temp'],
-            'dewpoint':   td['dewpoint'],
-            'wind_speed': wind['speed'],
-            'wind_dir':   wind['dir']
+            'pressure':   hp.get('pressure'),
+            'height':     hp.get('height'),
+            'temp':       td.get('temp'),
+            'dewpoint':   td.get('dewpoint'),
+            'wind_speed': wind.get('speed'),
+            'wind_dir':   wind.get('dir')
         }
 
     def parse_ttaa(self) -> dict:
@@ -360,20 +381,29 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
-        for i in range(2, len(self.tokens), 3):
+        i = 2
+
+        while i < len(self.tokens):
             if len(self.tokens) < i+3:
                 break
 
+            prefix = self.tokens[i][0:2]
+
             #
-            # Stop parsing tokens at the tropopause.
+            # Stop parsing tokens at the tropopause
             #
-            if self.tokens[i][0:2] == '88':
+            if prefix == '88':
                 break
 
-            sample = self.parse_ttaa_sample(self.tokens[i:i+3])
+            if prefix in self.PRESSURE_CODES:
+                sample = self.parse_ttaa_sample(self.tokens[i:i+3])
 
-            if sample is not None:
-                samples.append(sample)
+                if sample is not None:
+                    samples.append(sample)
+
+                i += 3
+            else:
+                i += 1
 
         return {
             'station':   station,
@@ -382,18 +412,21 @@ class RAOBObs():
         }
 
     def parse_ttbb_sample(self, tokens: list[str]) -> dict:
+        if tokens[0] == 'NIL':
+            return {}
+
         hp = self.parse_pressure(tokens[0])
 
         ret = {
-            'pressure': hp['pressure'],
+            'pressure': hp.get('pressure'),
             'temp':     None,
             'dewpoint': None
         }
 
         if len(tokens) > 1:
             td = self.parse_temp_dewpoint(tokens[1])
-            ret['temp']     = td['temp']
-            ret['dewpoint'] = td['dewpoint']
+            ret['temp']     = td.get('temp')
+            ret['dewpoint'] = td.get('dewpoint')
 
         return ret
 
@@ -402,8 +435,17 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
-        for i in range(2, len(self.tokens), 2):
-            samples.append(self.parse_ttbb_sample(self.tokens[i:i+2]))
+        i = 2
+
+        while i < len(self.tokens):
+            prefix = self.tokens[i][0:2]
+
+            if prefix in self.PRESSURE_CODES:
+                samples.append(self.parse_ttbb_sample(self.tokens[i:i+2]))
+
+                i += 2
+            else:
+                i += 1
 
         return {
             'station':   station,