Convert RAOB wind speeds to meters/second from knots

lib/xmet/raob.py

@@ -10,6 +10,9 @@ from xmet.sounding import Sounding, SoundingSample
 CHUNK_SEP         = "\x01"
 CHUNK_STRIP_CHARS = "\x01\x03\x0a\x20"
 
+def meters_second(knots: float) -> float:
+    return knots / 1.944
+
 class RAOBReaderException(Exception):
     ...
 
@@ -92,7 +95,7 @@ class RAOBObs():
 
         return {
             'dir':   wind_dir,
-            'speed': wind_speed
+            'speed': meters_second(wind_speed)
         }
 
     TTAA_PRESSURES = {