diff --git a/lib/xmet/rawins.py b/lib/xmet/rawins.py
index bedb524..4defa4f 100644
--- a/lib/xmet/rawins.py
+++ b/lib/xmet/rawins.py
@@ -39,17 +39,10 @@ class RawinsObs():
         self.values.append(value)
 
     TTAA_HEIGHTS = {
-        '00': 1000,
-        '92':  925,
-        '85':  850,
-        '70':  700,
-        '50':  500,
-        '40':  400,
-        '30':  300,
-        '25':  250,
-        '20':  200,
-        '15':  150,
-        '10':  100,
+        '00': 1000, '92':  925, '85':  850,
+        '70':  700, '50':  500, '40':  400,
+        '30':  300, '25':  250, '20':  200,
+        '15':  150, '10':  100,
     }
 
     def parse_timestamp(self, value: str):
@@ -70,7 +63,8 @@ class RawinsObs():
     def parse_surface_pressure(self, value: str):
         if value[0:2] == '99':
             return {
-                'surface': float(value[2:5])
+                'height':   None,
+                'pressure': float(value[2:5])
             }
 
     def parse_temp_dewpoint(self, value: str):
@@ -133,24 +127,49 @@ class RawinsObs():
     def parse_height_pressure(self, value: str):
         token = value[0:2]
 
+        if value[2:5] == '///':
+            return None
+
         if token in self.TTAA_HEIGHTS:
             return {
                 'height':   self.TTAA_HEIGHTS[token],
                 'pressure': float(value[2:5])
             }
 
-    PRESSURES_SIG = {
+    PRESSURE_SIG = {
         '11': True, '22': True, '33': True, '44': True, '55': True,
         '66': True, '77': True, '88': True, '99': True
     }
 
     def parse_significant_pressure(self, value: str):
-        if value[0:2] in self.PRESSURES_SIG:
+        if value[0:2] in self.PRESSURE_SIG:
             return {
                 'height':   None,
                 'pressure': float(value[2:5])
             }
 
+    def parse_sample_values(self, values: list[str], first: bool=False) -> RawinsSample:
+        if first:
+            hp = self.parse_surface_pressure(values[0])
+        else:
+            hp = self.parse_height_pressure(values[0])
+
+        if hp is None:
+            return None
+
+        td   = self.parse_temp_dewpoint(values[1])
+        wind = self.parse_wind(values[2])
+
+        sample = RawinsSample()
+        sample.height     = hp['height']
+        sample.pressure   = hp['pressure']
+        sample.temp       = td['temp']     if td is not None else None
+        sample.dewpoint   = td['dewpoint'] if td is not None else None
+        sample.wind_dir   = wind['dir']    if wind is not None else None
+        sample.wind_speed = wind['speed']  if wind is not None else None
+
+        return sample
+
     def parse_ttaa(self):
         #
         # Return None if there is no height data up to 100mb.
@@ -168,19 +187,21 @@ class RawinsObs():
         sounding.timestamp = self.parse_timestamp(self.values[0])
         sounding.station   = int(self.values[1])
 
-        for i in range(2, len(self.values), 3):
+        sample = self.parse_sample_values(self.values[2:5], True)
+
+        if sample is None:
+            return
+
+        sounding.samples.append(sample)
+
+        for i in range(5, len(self.values), 3):
             if len(self.values) <= i+2 or self.values[i][-1] == '=':
                 break
 
-            td   = self.parse_temp_dewpoint(self.values[i+1])
-            wind = self.parse_wind(self.values[i+2])
+            sample = self.parse_sample_values(self.values[i:i+3])
 
-            sample = RawinsSample()
-            sample.pressure   = self.parse_surface_pressure(self.values[i])
-            sample.temp       = td['temp']     if td is not None else None
-            sample.dewpoint   = td['dewpoint'] if td is not None else None
-            sample.wind_dir   = wind['dir']    if wind is not None else None
-            sample.wind_speed = wind['speed']  if wind is not None else None
+            if sample is None:
+                continue
 
             sounding.samples.append(sample)