diff --git a/src/fire2a/meteo.py b/src/fire2a/meteo.py
index 3720640..ac76990 100644
--- a/src/fire2a/meteo.py
+++ b/src/fire2a/meteo.py
@@ -18,6 +18,8 @@
 __revision__ = "$Format:%H$"
 
 import sys
+import csv
+import os
 from datetime import datetime, time, timedelta
 from pathlib import Path
 
@@ -40,6 +42,22 @@
 # assert (ruta_data / "Estaciones.csv").is_file()
 
 
+def transform_weather_file(filename):
+    """Flip the direction of the wind in a weather file. Column containing wind direction must be called "WD".\
+        this changes the contents of the given file."""
+    temp_name = f"{filename}_tmp"
+    with open(filename, newline='') as csvfile, open(temp_name, mode='w') as outfile:
+        reader = csv.DictReader(csvfile)
+        writer = csv.DictWriter(outfile, reader.fieldnames)
+        writer.writeheader()
+        for i in reader:
+            i['WD'] = flip_wind(float(i["WD"]))
+            writer.writerow(i)
+    if os.path.isfile(filename):
+        os.remove(filename)
+        os.rename(temp_name, filename)
+
+
 def is_qgis_running():
     qgis = False
     try:
@@ -87,16 +105,7 @@ def distance(fila, lat, lon):
         return eucl_distance(fila, lat, lon)
 
 
-def meteo_to_c2f(alfa):
-    """@private"""
-    if alfa >= 0 and alfa < 180:
-        return round(alfa + 180, 2)
-    elif alfa >= 180 and alfa <= 360:
-        return round(alfa - 180, 2)
-    return np.nan
-
-
-def barlo_sota(a):
+def flip_wind(a):
     """Leeward to Windward wind angle direction flip. Barlovento a sotavento. Downwind to upwind."""
     return round((a + 180) % 360, 2)
 
@@ -215,8 +224,6 @@ def generate(
             # drop station
             # TODO no drop ?
             # chosen_meteo = chosen_meteo.drop(columns=["station"])
-            # wind direction
-            chosen_meteo.loc[:, "WD"] = chosen_meteo["WD"].apply(barlo_sota)
             # scenario name
             chosen_meteo.loc[:, "Scenario"] = "DMC" if numsims == 1 else f"DMC_{i+1}"
             # TODO sobra: datetime format
diff --git a/tests/test_meteo.py b/tests/test_meteo.py
index cf7ea6f..93645dd 100644
--- a/tests/test_meteo.py
+++ b/tests/test_meteo.py
@@ -33,9 +33,9 @@ def test_weather_lenght(tmp_path):
 def test_invert_wind():
     from numpy import linspace
 
-    from fire2a.meteo import barlo_sota, meteo_to_c2f
+    from fire2a.meteo import flip_wind
 
-    for a in linspace(1, 360, 12):
-        assert barlo_sota(a) - meteo_to_c2f(a) < 0.01, "Conversion incorrecta"
+    for a in linspace(0, 359, 12):
+        assert round(a,2) - flip_wind(flip_wind(a)) < 0.01, "Conversion incorrecta"
     # for a in np.linspace(-360, 720, 12):
     #     print(a, barlo_sota(a), meteo_to_c2f(a))