diff --git a/lib/xmet/spc.py b/lib/xmet/spc.py
index 9d0f331..f37b5d0 100644
--- a/lib/xmet/spc.py
+++ b/lib/xmet/spc.py
@@ -5,6 +5,7 @@ import datetime
 
 from xmet.db    import DatabaseTable
 from xmet.coord import COORD_SYSTEM
+from xmet.geo   import PointSequence
 from xmet.afos  import MONTHS, TIMEZONES
 
 RE_HEADER = re.compile(r'''
@@ -71,7 +72,7 @@ def parse_coord(coord: str) -> tuple[float, float]:
     return shapely.Point(0.01 * -lon,
                          0.01 * int(coord[0:4]))
 
-def each_poly(parts: list[str]):
+def each_point_sequence(parts: list[str]):
     points = list()
 
     for part in parts:
@@ -80,8 +81,14 @@ def each_poly(parts: list[str]):
         else:
             points.append(parse_coord(part))
 
-    if len(points) >= 3:
-        yield shapely.Polygon(points)
+    if len(points) > 1:
+        yield PointSequence(points)
+
+def each_poly(parts: list[str]):
+    for sequence in each_point_sequence(parts):
+        sequence.close()
+
+        yield sequence.poly
 
 class SPCOutlookArea(DatabaseTable):
     __slots__ = ('id', 'outlook_id', 'poly')