diff --git a/lib/xmet/sounding.py b/lib/xmet/sounding.py
index 0550bbf..fa2105f 100644
--- a/lib/xmet/sounding.py
+++ b/lib/xmet/sounding.py
@@ -1,8 +1,8 @@
 import datetime
 import shapely
 
-LAPSE_RATE_DRY   = 9.8 / 1000 # degrees C per 1000m
-LAPSE_RATE_MOIST = 4.0 / 1000
+LAPSE_RATE_DRY   = 9.8 # degrees C per 1000m
+LAPSE_RATE_MOIST = 4.0
 
 class SoundingSample():
     __slots__ = (
@@ -45,12 +45,20 @@ class SoundingSample():
 
         return 621.97 * (es / (self.pressure - es))
 
-    def lcl(self) -> float:
-        return (self.temperature - self.dewpoint) / 8.0
+    def lcl(self) -> float: # meters
+        return (self.temp - self.dewpoint) / 0.008
 
     def is_saturated(self) -> bool:
         return self.humidity >= 100.0
 
+    def lapse(self, h: float, rate=None) -> float:
+        if rate is None:
+            rate = LAPSE_RATE_MOIST if self.is_saturated() else LAPSE_RATE_DRY
+
+        hd = h - self.height
+
+        return self.temp - (rate * (hd / 1000))
+
 class Sounding():
     __slots__ = (
         'id', 'station', 'timestamp_observed', 'timestamp_released',