diff --git a/README.md b/README.md
index 113612b..4800149 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,7 @@ Each element in the list has the following attributes:
  * `text: str`: language specific additional information about the warning
  * `starts_at: datetime`: time at which the warning starts being relevant
  * `ends_at: datetime`: time at which the warning stops being relevant
+ * `is_active: bool`: `true` if `starts_at` < now < `ends_at`
 
 The following table summarizes the different known warning types.  Other warning types may be returned and will have `unknown` as slug.  Feel free to open an issue with the id and the English friendly name to have it added to this integration.
 
@@ -104,6 +105,9 @@ The following table summarizes the different known warning types.  Other warning
 | storm_surge                 | 15         | Storm surge, Marée forte, Stormtij, Sturmflut                                            |
 | coldspell                   | 17         | Coldspell, Vague de froid, Koude, Koude                                                  |
 
+The sensor has an attribute called `active_warnings_friendly_names`, holding a comma separated list of the friendly names
+of the currently active warnings (e.g. `Fog, Ice or snow`).  There is no particular order for the list.
+
 ## Disclaimer
 
 This is a personal project and isn't in any way affiliated with, sponsored or endorsed by [The Royal Meteorological 
diff --git a/custom_components/irm_kmi/binary_sensor.py b/custom_components/irm_kmi/binary_sensor.py
index 5442512..1e490d3 100644
--- a/custom_components/irm_kmi/binary_sensor.py
+++ b/custom_components/irm_kmi/binary_sensor.py
@@ -59,4 +59,12 @@ class IrmKmiWarning(CoordinatorEntity, BinarySensorEntity):
     def extra_state_attributes(self) -> dict:
         """Return the camera state attributes."""
         attrs = {"warnings": self.coordinator.data.get('warnings', [])}
+
+        now = datetime.datetime.now(tz=pytz.timezone(self.hass.config.time_zone))
+        for warning in attrs['warnings']:
+            warning['is_active'] = warning.get('starts_at') < now < warning.get('ends_at')
+
+        attrs["active_warnings_friendly_names"] = ", ".join([warning['friendly_name'] for warning in attrs['warnings']
+                                                             if warning['is_active']])
+
         return attrs
diff --git a/custom_components/irm_kmi/coordinator.py b/custom_components/irm_kmi/coordinator.py
index f7cfd39..b344e41 100644
--- a/custom_components/irm_kmi/coordinator.py
+++ b/custom_components/irm_kmi/coordinator.py
@@ -347,10 +347,10 @@ class IrmKmiCoordinator(DataUpdateCoordinator):
                          dark_mode=self._dark_mode,
                          tz=self.hass.config.time_zone)
 
-    def warnings_from_data(self, warning_data: list | None) -> List[WarningData] | None:
+    def warnings_from_data(self, warning_data: list | None) -> List[WarningData]:
         """Create a list of warning data instances based on the api data"""
         if warning_data is None or not isinstance(warning_data, list) or len(warning_data) == 0:
-            return None
+            return []
 
         result = list()
         for data in warning_data:
@@ -379,4 +379,4 @@ class IrmKmiCoordinator(DataUpdateCoordinator):
                 )
             )
 
-        return result if len(result) > 0 else None
+        return result if len(result) > 0 else []
diff --git a/custom_components/irm_kmi/data.py b/custom_components/irm_kmi/data.py
index 4a045b1..6267ce3 100644
--- a/custom_components/irm_kmi/data.py
+++ b/custom_components/irm_kmi/data.py
@@ -63,4 +63,4 @@ class ProcessedCoordinatorData(TypedDict, total=False):
     hourly_forecast: List[Forecast] | None
     daily_forecast: List[IrmKmiForecast] | None
     animation: RadarAnimationData
-    warnings: List[WarningData] | None
+    warnings: List[WarningData]
diff --git a/tests/test_binary_sensor.py b/tests/test_binary_sensor.py
index 276c82a..7f320a6 100644
--- a/tests/test_binary_sensor.py
+++ b/tests/test_binary_sensor.py
@@ -25,3 +25,8 @@ async def test_warning_data(
 
     assert warning.is_on
     assert len(warning.extra_state_attributes['warnings']) == 2
+
+    for w in warning.extra_state_attributes['warnings']:
+        assert w['is_active']
+
+    assert warning.extra_state_attributes['active_warnings_friendly_names'] == "Fog, Ice or snow"