diff --git a/lib/xmet/thermo.py b/lib/xmet/thermo.py
index c1424a9..3a01ea7 100644
--- a/lib/xmet/thermo.py
+++ b/lib/xmet/thermo.py
@@ -2,6 +2,8 @@ import math
 
 from typing import Callable
 
+from xmet.series import Series
+
 LAPSE_RATE_DRY   = 9.8 / 1000 # degrees C per km
 LAPSE_RATE_MOIST = 4.0 / 1000
 
@@ -141,3 +143,37 @@ def loft_parcel(start_temp: float,
             pressure = PRESSURE_MIN
         else:
             pressure -= step
+
+def follow_dry_adiabat(temp: float, pressure: float) -> Series:
+    series = Series()
+
+    for level in loft_parcel(temp, pressure, lambda t, p: LAPSE_RATE_DRY):
+        t2, p2 = level
+
+        series[p2] = t2
+
+    return series
+
+def follow_moist_adiabat(temp: float, pressure: float) -> Series:
+    series = Series()
+
+    for level in loft_parcel(temp, pressure, moist_lapse_rate):
+        t2, p2 = level
+
+        series[p2] = t2
+
+    return series
+
+def follow_saturated_mixing_ratio(temp: float, pressure: float) -> Series:
+    series = dict()
+
+    ratio = saturated_mixing_ratio(temp, pressure)
+
+    p2 = pressure
+
+    while p2 >= PRESSURE_MIN:
+        series[p2] = mixing_ratio_temp(ratio, p2)
+
+        p2 -= 10
+
+    return series