diff --git a/lib/xmet/thermo.py b/lib/xmet/thermo.py
index 02e800f..e14dfb6 100644
--- a/lib/xmet/thermo.py
+++ b/lib/xmet/thermo.py
@@ -3,7 +3,7 @@ import math
 from typing import Callable
 
 from xmet.series import Series
-from xmet.units  import rad, kelvin, celsius
+from xmet.units  import rad, deg, kelvin, celsius
 
 LAPSE_RATE_DRY = 9.8 / 1000 # degrees C per km
 
@@ -196,3 +196,15 @@ def wind_u(speed: float, direction: float) -> float:
 
 def wind_v(speed: float, direction: float) -> float:
     return -speed * math.sin(rad(direction))
+
+def wind_uv(speed: float, direction: float) -> float:
+    return (
+        math.cos(rad(direction)) *  speed,
+        math.sin(rad(direction)) * -speed
+    )
+
+def wind_speed_dir(u: float, v: float) -> float:
+    return (
+        math.sqrt(u**2 + v**2),
+        (180 - deg(math.atan2(v, u))) % 360
+    )