diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index 7b69537..e89b060 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -168,6 +168,9 @@ class Hodograph():
 
     def each_significant_sample(self, sounding: Sounding):
         for sample in sounding.hodograph_samples():
+            if sample.wind_speed is None or sample.wind_dir is None:
+                continue
+
             if self.color(sample.height) is None:
                 break