Refactor radar distance search to match whole storm path

lib/nexrad/storm.py

@@ -118,17 +118,29 @@ class StormReport():
             select
                 id,
                 call,
-                ST_Distance(coord, MakePoint(?, ?, %d), true) as distance
+                ST_Distance(coord,
+                    MakeLine(MakePoint(?, ?, {csr}),
+                             MakePoint(?, ?, {csr})), true) as distance
             from
                 nexrad_radar
             where
-                distance <= 460000
+                distance <= 230000
             order by
                 distance asc
-            limit 3
+        """.format(csr=COORD_SYSTEM)
-        """ % (COORD_SYSTEM)
 
-        st = db.execute(sql, (self.coord_start.lon,
+        radars = list()
-                              self.coord_start.lat))
 
-        return st.fetchone()
+        st = db.execute(sql, (
+            self.coord_start.lon, self.coord_start.lat,
+            self.coord_end.lon,   self.coord_end.lat))
+
+        while True:
+            radar = st.fetchone()
+
+            if radar is None:
+                break
+
+            radars.append(radar)
+
+        return radars