diff --git a/_templates/6hrs.txt b/_templates/6hrs.txt
index 0592e17..61e1d8c 100644
--- a/_templates/6hrs.txt
+++ b/_templates/6hrs.txt
@@ -15,6 +15,7 @@
     <th colspan="3">Wind</th>
     <th rowspan="2">Regen</th>
     <th rowspan="2">Luftdruck</th>
+    <th rowspan="2">Vorhersage</th>
   </tr>
   <tr>
     <th>Ri</th>
@@ -35,6 +36,7 @@
     <td>#wind_gust "%.0f ㎞/h" "" "wind_kmph(x)"#</td>
     <td>#rain "%0.1f ㎜"#</td>
     <td>#rel_pressure "%.0f ㍱"#, #pressure_trend "%s" "" "pressure_trend_text(x)"#</td>
+    <td>#calc "Zambretti(params, data)"#</td>
   </tr>
 #jump 1#
 #endloop#
diff --git a/_templates/tweet_forecast.txt b/_templates/tweet_forecast.txt
new file mode 100644
index 0000000..30fb358
--- /dev/null
+++ b/_templates/tweet_forecast.txt
@@ -0,0 +1,21 @@
+#! pywws - Python software for USB Wireless Weather Stations                       #
+#! http://github.com/jim-easterbrook/pywws                                         #
+#! Copyright (C) 2008-13  Jim Easterbrook  jim@jim-easterbrook.me.uk               #
+#!                                                                                 #
+#! This program is free software; you can redistribute it and/or                   #
+#! modify it under the terms of the GNU General Public License                     #
+#! as published by the Free Software Foundation; either version 2                  #
+#! of the License, or (at your option) any later version.                          #
+#!                                                                                 #
+#! This program is distributed in the hope that it will be useful,                 #
+#! but WITHOUT ANY WARRANTY; without even the implied warranty of                  #
+#! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                   #
+#! GNU General Public License for more details.                                    #
+#!                                                                                 #
+#! You should have received a copy of the GNU General Public License               #
+#! along with this program; if not, write to the Free Software                     #
+#! Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA. #
+#hourly#
+#timezone local#
+#roundtime True#
+#idx "%H:%M %Z:"# Forecast for the next 12 hours: #calc "Zambretti(params, data)"#