diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 047c401..9ad1921 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -124,6 +124,12 @@ class RAOBObs():
         return 10.0 * height
 
     def calc_250mb_height(self, height: float) -> float:
+        if height >= 500:
+            return height * 10
+        else:
+            return 10.0 * (1000.0 + height)
+
+    def calc_100mb_height(self, height: float) -> float:
         return 10.0 * (1000.0 + height)
 
     def parse_height_pressure(self, token: str):
@@ -152,8 +158,10 @@ class RAOBObs():
             height = self.calc_850mb_height(float(num))
         elif pressure <= 500 and pressure > 250:
             height = self.calc_500mb_height(float(num))
-        elif pressure <= 250:
+        elif pressure <= 250 and pressure > 100:
             height = self.calc_250mb_height(float(num))
+        elif pressure <= 100:
+            height = self.calc_100mb_height(float(num))
         else:
             height = float(num)