diff --git a/Content.Server/DeltaV/Weather/WeatherEffectsSystem.cs b/Content.Server/DeltaV/Weather/WeatherEffectsSystem.cs
new file mode 100644
index 0000000000..11a29e05cc
--- /dev/null
+++ b/Content.Server/DeltaV/Weather/WeatherEffectsSystem.cs
@@ -0,0 +1,82 @@
+using Content.Shared.Damage;
+using Content.Shared.Mobs;
+using Content.Shared.Mobs.Components;
+using Content.Shared.Weather;
+using Content.Shared.Whitelist;
+using Robust.Shared.Map.Components;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Timing;
+
+namespace Content.Shared.DeltaV.Weather;
+
+/// <summary>
+/// Handles weather damage for exposed entities.
+/// </summary>
+public sealed partial class WeatherEffectsSystem : EntitySystem
+{
+    [Dependency] private readonly DamageableSystem _damageable = default!;
+    [Dependency] private readonly EntityWhitelistSystem _whitelist = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IPrototypeManager _proto = default!;
+    [Dependency] private readonly SharedMapSystem _map = default!;
+    [Dependency] private readonly SharedWeatherSystem _weather = default!;
+
+    private EntityQuery<MapGridComponent> _gridQuery;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        _gridQuery = GetEntityQuery<MapGridComponent>();
+    }
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        var now = _timing.CurTime;
+        var query = EntityQueryEnumerator<WeatherComponent>();
+        while (query.MoveNext(out var map, out var weather))
+        {
+            if (now < weather.NextUpdate)
+                continue;
+
+            weather.NextUpdate = now + weather.UpdateDelay;
+
+            foreach (var (id, data) in weather.Weather)
+            {
+                // start and end do no damage
+                if (data.State != WeatherState.Running)
+                    continue;
+
+                UpdateDamage(map, id);
+            }
+        }
+    }
+
+    private void UpdateDamage(EntityUid map, ProtoId<WeatherPrototype> id)
+    {
+        var weather = _proto.Index(id);
+        if (weather.Damage is not {} damage)
+            return;
+
+        var query = EntityQueryEnumerator<MobStateComponent, TransformComponent>();
+        while (query.MoveNext(out var uid, out var mob, out var xform))
+        {
+            // don't give dead bodies 10000 burn, that's not fun for anyone
+            if (xform.MapUid != map || mob.CurrentState == MobState.Dead)
+                continue;
+
+            // if not in space, check for being indoors
+            if (xform.GridUid is {} gridUid && _gridQuery.TryComp(gridUid, out var grid))
+            {
+                var tile = _map.GetTileRef((gridUid, grid), xform.Coordinates);
+                if (!_weather.CanWeatherAffect(gridUid, grid, tile))
+                    continue;
+            }
+
+            if (_whitelist.IsBlacklistFailOrNull(weather.DamageBlacklist, uid))
+                _damageable.TryChangeDamage(uid, damage, interruptsDoAfters: false);
+        }
+    }
+}
diff --git a/Content.Server/DeltaV/Weather/WeatherSchedulerComponent.cs b/Content.Server/DeltaV/Weather/WeatherSchedulerComponent.cs
new file mode 100644
index 0000000000..ac69c95705
--- /dev/null
+++ b/Content.Server/DeltaV/Weather/WeatherSchedulerComponent.cs
@@ -0,0 +1,58 @@
+using Content.Shared.Destructible.Thresholds;
+using Content.Shared.Weather;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+
+namespace Content.Server.DeltaV.Weather;
+
+/// <summary>
+/// Makes weather randomly happen every so often.
+/// </summary>
+[RegisterComponent, Access(typeof(WeatherSchedulerSystem))]
+[AutoGenerateComponentPause]
+public sealed partial class WeatherSchedulerComponent : Component
+{
+    /// <summary>
+    /// Weather stages to schedule.
+    /// </summary>
+    [DataField(required: true)]
+    public List<WeatherStage> Stages = new();
+
+    /// <summary>
+    /// The index of <see cref="Stages"/> to use next, wraps back to the start.
+    /// </summary>
+    [DataField]
+    public int Stage;
+
+    /// <summary>
+    /// When to go to the next step of the schedule.
+    /// </summary>
+    [DataField(customTypeSerializer: typeof(TimeOffsetSerializer)), AutoPausedField]
+    public TimeSpan NextUpdate;
+}
+
+/// <summary>
+/// A stage in a weather schedule.
+/// </summary>
+[Serializable, DataDefinition]
+public partial struct WeatherStage
+{
+    /// <summary>
+    /// A range of how long the stage can last for, in seconds.
+    /// </summary>
+    [DataField(required: true)]
+    public MinMax Duration = new(0, 0);
+
+    /// <summary>
+    /// The weather prototype to add, or null for clear weather.
+    /// </summary>
+    [DataField]
+    public ProtoId<WeatherPrototype>? Weather;
+
+    /// <summary>
+    /// Alert message to send in chat for players on the map when it starts.
+    /// </summary>
+    [DataField]
+    public LocId? Message;
+}
diff --git a/Content.Server/DeltaV/Weather/WeatherSchedulerSystem.cs b/Content.Server/DeltaV/Weather/WeatherSchedulerSystem.cs
new file mode 100644
index 0000000000..a19a2f3787
--- /dev/null
+++ b/Content.Server/DeltaV/Weather/WeatherSchedulerSystem.cs
@@ -0,0 +1,75 @@
+using Content.Server.Chat.Managers;
+using Content.Shared.Chat;
+using Content.Shared.Weather;
+using Robust.Shared.Map.Components;
+using Robust.Shared.Player;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+using Robust.Shared.Timing;
+
+namespace Content.Server.DeltaV.Weather;
+
+public sealed class WeatherSchedulerSystem : EntitySystem
+{
+    [Dependency] private readonly IChatManager _chat = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IPrototypeManager _proto = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+    [Dependency] private readonly SharedWeatherSystem _weather = default!;
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        var now = _timing.CurTime;
+        var query = EntityQueryEnumerator<WeatherSchedulerComponent>();
+        while (query.MoveNext(out var map, out var comp))
+        {
+            if (now < comp.NextUpdate)
+                continue;
+
+            if (comp.Stage >= comp.Stages.Count)
+                comp.Stage = 0;
+
+            var stage = comp.Stages[comp.Stage++];
+            var duration = stage.Duration.Next(_random);
+            comp.NextUpdate = now + TimeSpan.FromSeconds(duration);
+
+            var mapId = Comp<MapComponent>(map).MapId;
+            if (stage.Weather is {} weather)
+            {
+                var ending = comp.NextUpdate;
+                // crossfade weather so as one ends the next starts
+                if (HasWeather(comp, comp.Stage - 1))
+                    ending += WeatherComponent.ShutdownTime;
+                if (HasWeather(comp, comp.Stage + 1))
+                    ending += WeatherComponent.StartupTime;
+                _weather.SetWeather(mapId, _proto.Index(weather), ending);
+            }
+
+            if (stage.Message is {} message)
+            {
+                var msg = Loc.GetString(message);
+                _chat.ChatMessageToManyFiltered(
+                    Filter.BroadcastMap(mapId),
+                    ChatChannel.Radio,
+                    msg,
+                    msg,
+                    map,
+                    false,
+                    true,
+                    null);
+            }
+        }
+    }
+
+    private bool HasWeather(WeatherSchedulerComponent comp, int stage)
+    {
+        if (stage < 0)
+            stage = comp.Stages.Count + stage;
+        else if (stage >= comp.Stages.Count)
+            stage %= comp.Stages.Count;
+
+        return comp.Stages[stage].Weather != null;
+    }
+}
diff --git a/Content.Shared/DeltaV/Weather/Components/AshStormImmuneComponent.cs b/Content.Shared/DeltaV/Weather/Components/AshStormImmuneComponent.cs
new file mode 100644
index 0000000000..ec2c272695
--- /dev/null
+++ b/Content.Shared/DeltaV/Weather/Components/AshStormImmuneComponent.cs
@@ -0,0 +1,9 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.DeltaV.Weather.Components;
+
+/// <summary>
+/// Makes an entity not take damage from ash storms.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class AshStormImmuneComponent : Component;
diff --git a/Content.Shared/Weather/SharedWeatherSystem.cs b/Content.Shared/Weather/SharedWeatherSystem.cs
index b537884950..abe191a41d 100644
--- a/Content.Shared/Weather/SharedWeatherSystem.cs
+++ b/Content.Shared/Weather/SharedWeatherSystem.cs
@@ -38,6 +38,7 @@ public abstract class SharedWeatherSystem : EntitySystem
             if (weather.EndTime != null)
                 weather.EndTime = weather.EndTime.Value + args.PausedTime;
         }
+        component.NextUpdate += args.PausedTime; // DeltaV
     }
 
     public bool CanWeatherAffect(EntityUid uid, MapGridComponent grid, TileRef tileRef, RoofComponent? roofComp = null)
diff --git a/Content.Shared/Weather/WeatherComponent.cs b/Content.Shared/Weather/WeatherComponent.cs
index eaf901fb42..e16fe978fa 100644
--- a/Content.Shared/Weather/WeatherComponent.cs
+++ b/Content.Shared/Weather/WeatherComponent.cs
@@ -14,6 +14,18 @@ public sealed partial class WeatherComponent : Component
     [DataField]
     public Dictionary<ProtoId<WeatherPrototype>, WeatherData> Weather = new();
 
+    /// <summary>
+    /// DeltaV: How long to wait between updating weather effects.
+    /// </summary>
+    [DataField]
+    public TimeSpan UpdateDelay = TimeSpan.FromSeconds(1);
+
+    /// <summary>
+    /// DeltaV: When to next update weather effects (damage).
+    /// </summary>
+    [DataField(customTypeSerializer: typeof(TimeOffsetSerializer))]
+    public TimeSpan NextUpdate = TimeSpan.Zero;
+
     public static readonly TimeSpan StartupTime = TimeSpan.FromSeconds(15);
     public static readonly TimeSpan ShutdownTime = TimeSpan.FromSeconds(15);
 }
diff --git a/Content.Shared/Weather/WeatherPrototype.cs b/Content.Shared/Weather/WeatherPrototype.cs
index 246e929dce..60233f7b49 100644
--- a/Content.Shared/Weather/WeatherPrototype.cs
+++ b/Content.Shared/Weather/WeatherPrototype.cs
@@ -1,3 +1,5 @@
+using Content.Shared.Damage;
+using Content.Shared.Whitelist;
 using Robust.Shared.Audio;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Utility;
@@ -20,4 +22,17 @@ public sealed partial class WeatherPrototype : IPrototype
     /// </summary>
     [ViewVariables(VVAccess.ReadWrite), DataField("sound")]
     public SoundSpecifier? Sound;
+
+    /// <summary>
+    /// DeltaV: Damage you can take from being in this weather.
+    /// Only applies when weather has fully set in.
+    /// </summary>
+    [DataField]
+    public DamageSpecifier? Damage;
+
+    /// <summary>
+    /// DeltaV: Don't damage entities that match this blacklist.
+    /// </summary>
+    [DataField]
+    public EntityWhitelist? DamageBlacklist;
 }
diff --git a/Resources/Locale/en-US/deltav/weather/ashstorm.ftl b/Resources/Locale/en-US/deltav/weather/ashstorm.ftl
new file mode 100644
index 0000000000..4977852250
--- /dev/null
+++ b/Resources/Locale/en-US/deltav/weather/ashstorm.ftl
@@ -0,0 +1,3 @@
+ash-storm-telegraph = [color=red][bold]An eerie moan rises on the wind. Sheets of burning ash blacken the horizon. Seek shelter.[/bold][/color]
+ash-storm-alert = [color=red][bolditalic]Smoldering clouds of scorching ash billow down around you! Get inside![/bolditalic][/color]
+ash-storm-clearing = [color=red]The shrieking wind whips away the last of the ash and falls to its usual murmur. It should be safe to go outside now.[/color]
diff --git a/Resources/Prototypes/Body/Prototypes/ashwalker.yml b/Resources/Prototypes/Body/Prototypes/ashwalker.yml
new file mode 100644
index 0000000000..59c55e89f4
--- /dev/null
+++ b/Resources/Prototypes/Body/Prototypes/ashwalker.yml
@@ -0,0 +1,50 @@
+# TODO: will need updating with shitmed
+- type: body
+  name: ashwalker
+  id: AshWalker
+  root: torso
+  slots:
+    head:
+      part: HeadReptilian
+      connections:
+      - torso
+      organs:
+        brain: OrganHumanBrain
+        eyes: OrganHumanEyes
+    torso:
+      part: TorsoReptilian
+      organs:
+        heart: OrganAnimalHeart
+        lungs: OrganAshWalkerLungs
+        stomach: OrganReptilianStomach
+        liver: OrganAnimalLiver
+        kidneys: OrganHumanKidneys
+      connections:
+      - right arm
+      - left arm
+      - right leg
+      - left leg
+    right arm:
+      part: RightArmReptilian
+      connections:
+      - right hand
+    left arm:
+      part: LeftArmReptilian
+      connections:
+      - left hand
+    right hand:
+      part: RightHandReptilian
+    left hand:
+      part: LeftHandReptilian
+    right leg:
+      part: RightLegReptilian
+      connections:
+      - right foot
+    left leg:
+      part: LeftLegReptilian
+      connections:
+      - left foot
+    right foot:
+      part: RightFootReptilian
+    left foot:
+      part: LeftFootReptilian
diff --git a/Resources/Prototypes/DeltaV/Body/Organs/ashwalker.yml b/Resources/Prototypes/DeltaV/Body/Organs/ashwalker.yml
new file mode 100644
index 0000000000..c0388ffd0e
--- /dev/null
+++ b/Resources/Prototypes/DeltaV/Body/Organs/ashwalker.yml
@@ -0,0 +1,9 @@
+- type: entity
+  parent: OrganAnimalLungs
+  id: OrganAshWalkerLungs
+  name: ashwalker lungs
+  description: These lungs are adapted from isolation in lavaland, capable of withstanding the low oxygen content and ash storms.
+  components:
+  - type: Lung
+    saturationLoss: 0.5
+  # TODO SHITMED: add AshStormImmune when transplanted
diff --git a/Resources/Prototypes/DeltaV/Entities/Mobs/Species/ashwalker.yml b/Resources/Prototypes/DeltaV/Entities/Mobs/Species/ashwalker.yml
new file mode 100644
index 0000000000..4a397caaa3
--- /dev/null
+++ b/Resources/Prototypes/DeltaV/Entities/Mobs/Species/ashwalker.yml
@@ -0,0 +1,11 @@
+- type: entity
+  save: false
+  parent: MobReptilian
+  id: MobAshWalker
+  name: Urist McAsh
+  suffix: ""
+  components:
+  - type: Body
+    prototype: AshWalker
+  - type: AshStormImmune
+  # TODO: shitmed stuff so you can steal ashwalker lungs
diff --git a/Resources/Prototypes/weather.yml b/Resources/Prototypes/weather.yml
index a71e59354a..896df8641a 100644
--- a/Resources/Prototypes/weather.yml
+++ b/Resources/Prototypes/weather.yml
@@ -8,6 +8,12 @@
     params:
       loop: true
       volume: -6
+  damage: # DeltaV
+    types:
+      Heat: 4
+  damageBlacklist: # DeltaV
+    components:
+    - AshStormImmune
 
 - type: weather
   id: AshfallLight