diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 988b7de..ca0a6b4 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -194,12 +194,15 @@ class RAOBObs():
             }
 
     def parse_surface_pressure(self, token: str):
-        code, pressure = token[0:2], token[2:5]
+        code, pressure = token[0:2], float(token[2:5])
+
+        if pressure < 100:
+            pressure += 1000.0
 
         if code == '99':
             return {
                 'height':   None,
-                'pressure': float(pressure)
+                'pressure': pressure
             }
 
     def parse_sample_tokens(self, tokens: list[str]) -> SoundingSample: