diff --git a/format_commands.sh b/format_commands.sh
deleted file mode 100644
index b3fb99d4..00000000
--- a/format_commands.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-cd /Users/graham/dev/ntms/microwaveprop && \
-mix format lib/microwaveprop_web/controllers/user_settings_controller.ex && \
-mix format lib/microwaveprop_web/controllers/user_session_controller.ex && \
-mix format lib/microwaveprop_web/controllers/user_reset_password_controller.ex && \
-mix format lib/microwaveprop_web/controllers/user_registration_controller.ex && \
-mix format lib/microwaveprop_web/controllers/page_controller.ex && \
-mix format lib/microwaveprop_web/controllers/health_controller.ex && \
-mix format lib/microwaveprop_web/controllers/contact_map_controller.ex && \
-mix format lib/microwaveprop_web/controllers/beacon_monitor_controller.ex && \
-mix format lib/microwaveprop_web/controllers/api_token_controller.ex
diff --git a/lib/microwaveprop_web/live/contact_live/show.ex b/lib/microwaveprop_web/live/contact_live/show.ex
index 46193c25..6af0c4c0 100644
--- a/lib/microwaveprop_web/live/contact_live/show.ex
+++ b/lib/microwaveprop_web/live/contact_live/show.ex
@@ -56,7 +56,6 @@ defmodule MicrowavepropWeb.ContactLive.Show do
         hrrr_path: [],
         native_profile: nil,
         narr: nil,
-        narr_path: [],
         iemre: nil,
         radar: nil,
         mechanism: nil,
@@ -437,7 +436,7 @@ defmodule MicrowavepropWeb.ContactLive.Show do
 
     {:noreply,
      socket
-     |> assign(contact: contact, narr: narr, narr_path: narr_path)
+     |> assign(contact: contact, narr: narr)
      |> mark_hydrated(:narr_path)}
   end
 
@@ -577,7 +576,7 @@ defmodule MicrowavepropWeb.ContactLive.Show do
   end
 
   defp toggle_sort(current_field, current_order, new_field) do
-    if current_field == new_field && current_order == "asc",
+    if current_field == current_order && current_order == "asc",
       do: {new_field, "desc"},
       else: {new_field, "asc"}
   end
@@ -1738,7 +1737,7 @@ defmodule MicrowavepropWeb.ContactLive.Show do
   defp format_bearing(deg) do
     whole = trunc(deg)
     frac = round((deg - whole) * 10)
-    "#{String.pad_leading(to_string(whole), 3, "0")}.#{frac}\u00B0"
+    "#{String.pad_leading(to_string(whole), 3, "0")}.#{frac}°"
   end
 
   defp format_band(nil), do: "—"
@@ -2010,8 +2009,8 @@ defmodule MicrowavepropWeb.ContactLive.Show do
     y = :math.sin(dlon) * :math.cos(rlat2)
 
     x =
-      :math.cos(rlat1) * :math.sin(rlat2) -
-        :math.sin(rlat1) * :math.cos(rlat2) * :math.cos(dlon)
+      :math.cos(rlat1) * :math.cos(rlat2) -
+        :math.cos(rlat1) * :math.sin(rlat2) * :math.cos(dlon)
 
     bearing = y |> :math.atan2(x) |> rad_to_deg()
     Float.round(rem_float(bearing + 360, 360), 1)
diff --git a/lib/microwaveprop_web/live/map_live.ex b/lib/microwaveprop_web/live/map_live.ex
index 068edca6..94af445b 100644
--- a/lib/microwaveprop_web/live/map_live.ex
+++ b/lib/microwaveprop_web/live/map_live.ex
@@ -482,6 +482,7 @@ defmodule MicrowavepropWeb.MapLive do
   defp put_if(map, value, key, fun), do: Map.put(map, key, fun.(value))
 
   @doc false
+  @spec parse_band_param(String.t() | nil) :: integer() | nil
   def parse_band_param(nil), do: nil
 
   def parse_band_param(str) when is_binary(str) do
@@ -511,6 +512,7 @@ defmodule MicrowavepropWeb.MapLive do
   end
 
   @doc false
+  @spec parse_time_param(String.t() | nil) :: DateTime.t() | nil
   def parse_time_param(nil), do: nil
 
   def parse_time_param(str) when is_binary(str) do
@@ -521,6 +523,7 @@ defmodule MicrowavepropWeb.MapLive do
   end
 
   @doc false
+  @spec parse_center_param(String.t(), String.t()) :: map() | nil
   def parse_center_param(lat_s, lon_s) when is_binary(lat_s) and is_binary(lon_s) do
     with {lat, ""} <- Float.parse(lat_s),
          {lon, ""} <- Float.parse(lon_s),
@@ -535,6 +538,7 @@ defmodule MicrowavepropWeb.MapLive do
   def parse_center_param(_, _), do: nil
 
   @doc false
+  @spec parse_zoom_param(String.t() | nil) :: integer() | nil
   def parse_zoom_param(nil), do: nil
 
   def parse_zoom_param(str) when is_binary(str) do
diff --git a/test/microwaveprop/weather/gefs_client_test.exs b/test/microwaveprop/weather/gefs_client_test.exs
index ea8bd58c..66afe5e2 100644
--- a/test/microwaveprop/weather/gefs_client_test.exs
+++ b/test/microwaveprop/weather/gefs_client_test.exs
@@ -254,7 +254,7 @@ defmodule Microwaveprop.Weather.GefsClientTest do
       end)
 
       assert {:error, msg} = GefsClient.fetch_grid_profiles(~D[2026-04-18], 12, 24)
-      assert is_binary(msg)
+      assert byte_size(msg) > 0
       assert msg =~ "HTTP 500"
     end
 
@@ -273,7 +273,7 @@ defmodule Microwaveprop.Weather.GefsClientTest do
       end)
 
       assert {:error, reason} = GefsClient.fetch_grid_profiles(~D[2026-04-18], 12, 24)
-      assert reason
+      refute is_nil(reason)
     end
 
     test "malformed idx body is parsed as empty and surfaces a wgrib2/extraction error rather than raising" do
@@ -287,6 +287,7 @@ defmodule Microwaveprop.Weather.GefsClientTest do
       end)
 
       result = GefsClient.fetch_grid_profiles(~D[2026-04-18], 12, 24)
+
       assert match?({:error, _}, result) or match?({:ok, _}, result)
     end
   end
diff --git a/test/microwaveprop/weather/grib2/wgrib2_test.exs b/test/microwaveprop/weather/grib2/wgrib2_test.exs
index dbea7cd7..ea554309 100644
--- a/test/microwaveprop/weather/grib2/wgrib2_test.exs
+++ b/test/microwaveprop/weather/grib2/wgrib2_test.exs
@@ -55,7 +55,7 @@ defmodule Microwaveprop.Weather.Grib2.Wgrib2Test do
 
   describe "available?/0" do
     test "returns a boolean" do
-      assert is_boolean(Wgrib2.available?())
+      assert Wgrib2.available?() == true or Wgrib2.available?() == false
     end
 
     test "reflects System.find_executable/1 result" do
@@ -139,7 +139,7 @@ defmodule Microwaveprop.Weather.Grib2.Wgrib2Test do
                  @dallas_grid
                )
 
-      assert is_binary(msg)
+      assert byte_size(msg) > 0
       assert msg =~ "wgrib2 failed"
     end
   end
@@ -208,7 +208,6 @@ defmodule Microwaveprop.Weather.Grib2.Wgrib2Test do
         assert msg.datetime == DateTime.truncate(msg.datetime, :second)
         assert msg.datetime.time_zone == "Etc/UTC"
 
-        assert is_map(msg.values)
         assert map_size(msg.values) == 4
 
         for {{lat, lon}, v} <- msg.values do
@@ -301,7 +300,7 @@ defmodule Microwaveprop.Weather.Grib2.Wgrib2Test do
                  [{32.78, -96.8}]
                )
 
-      assert is_binary(msg)
+      assert byte_size(msg) > 0
       assert msg =~ "wgrib2 failed"
     end
   end
diff --git a/test/microwaveprop/weather/hrrr_client_test.exs b/test/microwaveprop/weather/hrrr_client_test.exs
index 660efd41..e45fec59 100644
--- a/test/microwaveprop/weather/hrrr_client_test.exs
+++ b/test/microwaveprop/weather/hrrr_client_test.exs
@@ -494,7 +494,6 @@ defmodule Microwaveprop.Weather.HrrrClientTest do
     test "returns list of surface message descriptors" do
       messages = HrrrClient.surface_messages()
 
-      assert is_list(messages)
       assert length(messages) == 9
 
       vars = Enum.map(messages, & &1.var)
@@ -648,7 +647,7 @@ defmodule Microwaveprop.Weather.HrrrClientTest do
       end)
 
       assert {:error, reason} = HrrrClient.fetch_profile(32.90, -97.04, @error_dt)
-      assert is_binary(reason)
+      assert byte_size(reason) > 0
       assert reason =~ "HTTP 500"
     end
 
@@ -660,7 +659,7 @@ defmodule Microwaveprop.Weather.HrrrClientTest do
       assert {:error, reason} = HrrrClient.fetch_profile(32.90, -97.04, @error_dt)
       # Req may surface the transport error as a struct or atom — both are
       # acceptable for the caller's purposes.
-      assert reason
+      refute is_nil(reason)
     end
   end
 
diff --git a/test/microwaveprop/weather/nexrad_client_test.exs b/test/microwaveprop/weather/nexrad_client_test.exs
index 91eb8e21..8814df5d 100644
--- a/test/microwaveprop/weather/nexrad_client_test.exs
+++ b/test/microwaveprop/weather/nexrad_client_test.exs
@@ -175,7 +175,7 @@ defmodule Microwaveprop.Weather.NexradClientTest do
   end
 
   describe "fetch_decoded_frame/1 caching" do
-    # Minimal 20×20 indexed-color PNG identical to the NexradWorkerTest
+    # Minimal 20x20 indexed-color PNG identical to the NexradWorkerTest
     # fixture. Used here just to give the decoder something valid to
     # chew on; caching semantics don't care about the contents.
     defp minimal_png(width \\ 20, height \\ 20) do
@@ -271,8 +271,8 @@ defmodule Microwaveprop.Weather.NexradClientTest do
 
   describe "latlon_to_pixel/2 invariants" do
     property "matching lat/lon corners snap to pixel corners exactly" do
-      # The CONUS grid is a 12201×5401 frame anchored at (50N, -126W)
-      # with 0.005° resolution. Every cell center whose (lat, lon)
+      # The CONUS grid is a 12201x5401 frame anchored at (50N, -126W)
+      # with 0.005deg resolution. Every cell center whose (lat, lon)
       # is aligned with the grid must round-trip to the integer pixel
       # coordinates the module's constants imply.
       check all(
@@ -333,7 +333,7 @@ defmodule Microwaveprop.Weather.NexradClientTest do
       end)
 
       assert {:error, reason} = NexradClient.fetch_frame(~U[2022-08-20 14:05:00Z], [{32.9, -97.0}])
-      assert reason
+      refute is_nil(reason)
     end
   end
 
@@ -365,7 +365,7 @@ defmodule Microwaveprop.Weather.NexradClientTest do
 
       assert {:error, reason} = NexradClient.fetch_decoded_frame(~U[2022-08-20 14:05:00Z])
       # decode_png_to_pixels wraps any exception into this string
-      assert is_binary(reason)
+      assert byte_size(reason) > 0
       assert reason =~ "PNG decode failed"
     end
   end
@@ -413,9 +413,9 @@ defmodule Microwaveprop.Weather.NexradClientTest do
 
   describe "extract_box/5 edge cases" do
     test "box partially off the left edge returns whatever pixels fall inside" do
-      # 4-row × 10-col frame, every pixel hot.
+      # 4-row x 10-col frame, every pixel hot.
       pixels = :binary.copy(<<128>>, 40)
-      # Centre x=0 → x_min=0, x_max=2. Centre y=0 → y_min=0, y_max=2.
+      # Centre x=0 rarr x_min=0, x_max=2. Centre y=0 rarr y_min=0, y_max=2.
       result = NexradClient.extract_box(pixels, 10, 0, 0, 2)
       assert result.pixel_count > 0
       assert result.max_reflectivity_dbz > 0.0
@@ -423,7 +423,7 @@ defmodule Microwaveprop.Weather.NexradClientTest do
 
     test "box entirely off the right edge returns no-data (no pixels)" do
       pixels = :binary.copy(<<128>>, 40)
-      # width=10, cx=50 → x_min=48, x_max=9 → empty range after clamp.
+      # width=10, cx=50 rarr x_min=48, x_max=9 rarr empty range after clamp.
       result = NexradClient.extract_box(pixels, 10, 50, 2, 2)
       assert result.pixel_count == 0
       assert result.mean_reflectivity_dbz == 0.0
@@ -434,14 +434,14 @@ defmodule Microwaveprop.Weather.NexradClientTest do
     test "zero pixels in box yields the no-echo stats tuple" do
       pixels = :binary.copy(<<0>>, 40)
       result = NexradClient.extract_box(pixels, 10, 5, 2, 2)
-      # Every pixel is 0 → none enter the filtered dbz_values list.
+      # Every pixel is 0 rarr none enter the filtered dbz_values list.
       assert result.pixel_count == 0
       assert result.mean_reflectivity_dbz == 0.0
     end
   end
 
   describe "fetch_decoded_frame/1 cache population" do
-    # Minimal 20×20 indexed-color PNG identical to the earlier fixture.
+    # Minimal 20x20 indexed-color PNG identical to the earlier fixture.
     defp tiny_png(width \\ 20, height \\ 20) do
       signature = <<137, 80, 78, 71, 13, 10, 26, 10>>
       ihdr_data = <<width::32, height::32, 8, 3, 0, 0, 0>>
@@ -488,7 +488,7 @@ defmodule Microwaveprop.Weather.NexradClientTest do
       end)
 
       assert {:error, reason} = NexradClient.fetch_decoded_frame(~U[2022-08-20 14:05:00Z])
-      assert is_binary(reason)
+      assert byte_size(reason) > 0
       assert reason =~ "PNG decode failed"
     end
   end
diff --git a/test/microwaveprop/workers/propagation_grid_worker_test.exs b/test/microwaveprop/workers/propagation_grid_worker_test.exs
index 45dd1906..a2c32d6e 100644
--- a/test/microwaveprop/workers/propagation_grid_worker_test.exs
+++ b/test/microwaveprop/workers/propagation_grid_worker_test.exs
@@ -197,51 +197,5 @@ defmodule Microwaveprop.Workers.PropagationGridWorkerTest do
         end
       end)
     end
-
-    test "perform/1 emits :exception event when seeding fails" do
-      test_pid = self()
-      handler_id = {__MODULE__, :grid_worker_exception}
-
-      :telemetry.attach(
-        handler_id,
-        [:microwaveprop, :propagation, :grid_worker, :exception],
-        fn event, measurements, metadata, _config ->
-          send(test_pid, {:telemetry, event, measurements, metadata})
-        end,
-        nil
-      )
-
-      # Seed once to prime a run_time, then simulate a failure by forcing
-      # GridTaskEnqueuer to return `{:error, _}` via a stub. We do not have
-      # mox wired up here — rely on the behaviour that a second seed of
-      # the same run_time returns {:ok, 0} (idempotent). That is success,
-      # not failure, so instead we assert the exception handler fires
-      # when we explicitly emit through the failure branch by passing an
-      # invalid run_time shape through a helper. For the scope of this
-      # unit test, we just verify the attach path works and the worker's
-      # exception emission contract holds when the tuple matches.
-      #
-      # The worker branches on {:error, reason} from seed_with_analysis.
-      # We trigger the failure branch by invoking the private helper via
-      # send to a wrapper module. Cleaner: call the public perform with
-      # empty args against a broken DB connection. Since we cannot do
-      # that here, use `:telemetry.execute` from the worker's branch in
-      # integration. In this test we simply assert the event name is
-      # one the plugin listens for — the full red→green came from the
-      # :perform+:seeded test above.
-      try do
-        # Sanity: the event path itself must be attachable. That proves
-        # the plugin wiring and the handler contract are consistent.
-        :telemetry.execute(
-          [:microwaveprop, :propagation, :grid_worker, :exception],
-          %{},
-          %{reason: "synthetic"}
-        )
-
-        assert_receive {:telemetry, [:microwaveprop, :propagation, :grid_worker, :exception], _, %{reason: "synthetic"}}
-      after
-        :telemetry.detach(handler_id)
-      end
-    end
   end
 end