diff --git a/lib/nexrad/afos.py b/lib/nexrad/afos.py
index 011bc4b..418a046 100644
--- a/lib/nexrad/afos.py
+++ b/lib/nexrad/afos.py
@@ -77,7 +77,7 @@ def parse_poly(text: str):
 
         points.append([parse_lon(lon), parse_lat(lat)])
 
-    points.append([parse_lon(coords[0]), parse_lat(coords[1])])
+    points.append([parse_lon(coords[1]), parse_lat(coords[0])])
 
     return shapely.Polygon(points)