Refactor from pair-programming session

src/metpy/io/text.py

@@ -42,26 +42,23 @@ def _decode_coords(coordinates):
     (-119.3, 47.3)
 
     """
-    # Based on the number of digits, find the correct place to split between lat and lon
-    # Hires bulletins provide 7 digits for coordinates; regular bulletins provide 4 or 5 digits
+    # Define latitude orientation
+    flip = 1
+
     if coordinates[0] == '-':
         coordinates = coordinates[1:]
-        split_pos = int(len(coordinates) / 2)
-        lat, lon = coordinates[:split_pos], coordinates[split_pos:]
-
-        # Insert decimal point at the correct place and convert to float
-        lat = -float(f'{lat[:2]}.{lat[2:]}')
-        lon = -float(f'{lon[:3]}.{lon[3:]}')
-        return lon, lat
-
-    if coordinates[0] != '-':
-        split_pos = int(len(coordinates) / 2)
-        lat, lon = coordinates[:split_pos], coordinates[split_pos:]
-
-        # Insert decimal point at the correct place and convert to float
-        lat = float(f'{lat[:2]}.{lat[2:]}')
-        lon = -float(f'{lon[:3]}.{lon[3:]}')
-        return lon, lat
+        # Flip latitude to Southern Hemisphere
+        flip = -1
+
+    # Based on the number of digits, find the correct place to split between lat and lon
+    # Hires bulletins provide 7 digits for coordinates; regular bulletins provide 4 or 5 digits
+    split_pos = int(len(coordinates) / 2)
+    lat, lon = coordinates[:split_pos], coordinates[split_pos:]
+
+    # Insert decimal point at the correct place and convert to float
+    lat = float(f'{lat[:2]}.{lat[2:]}') * flip
+    lon = -float(f'{lon[:3]}.{lon[3:]}')
+    return lon, lat
 
 
 def _regroup_lines(iterable):