diff --git a/lib/xmet/thermo.py b/lib/xmet/thermo.py
index 984706b..c19a6e1 100644
--- a/lib/xmet/thermo.py
+++ b/lib/xmet/thermo.py
@@ -113,6 +113,8 @@ def loft_parcel(start_temp: float,
     temp     = start_temp
     pressure = start_pressure
 
+    yield temp, pressure
+
     while pressure >= PRESSURE_MIN:
         height = pressure_height(pressure)