diff --git a/create_latest_map.jl b/create_latest_map.jl
index 5439dda..e8117b7 100644
--- a/create_latest_map.jl
+++ b/create_latest_map.jl
@@ -1,5 +1,5 @@
 #!/usr/bin/env julia
-#
+
 using DataFrames
 using Dates
 using CSV
@@ -12,140 +12,157 @@ using Printf
 using TimeZones
 
 function get_station_lat_lon(station_id)
-	stations = readxml("activestations.xml")
-	station_node = findfirst("/stations/station[@id=\"$station_id\"]", stations)
-	return parse.(Float32, [station_node["lat"], station_node["lon"]])
+    stations = readxml("activestations.xml")
+    station_node = findfirst("/stations/station[@id=\"$station_id\"]", stations)
+    return parse.(Float32, [station_node["lat"], station_node["lon"]])
 end
 
 tryparsem(T, str) = something(tryparse(T, str), missing)
 
 function get_tile_xy_fraction(lat, lon, zoom)
-	n = 2^zoom
-	lat_rad = lat * pi / 180
-	xtile = (lon + 180) / 360 * n
-    ytile = (1 - log(tan(lat_rad) + 1 / cos(lat_rad)) / pi) / 2 * n
-	return xtile, ytile
+    n = 2^zoom
+    lat_rad = lat * pi / 180
+    xtile = (lon + 180) / 360 * n
+        ytile = (1 - log(tan(lat_rad) + 1 / cos(lat_rad)) / pi) / 2 * n
+    return xtile, ytile
 end
 
 function get_tile_xy(lat, lon, zoom)
-	xf, yf = get_tile_xy_fraction(lat, lon, zoom)
-	return (Int(floor(xf)), Int(floor(yf)))
+    xf, yf = get_tile_xy_fraction(lat, lon, zoom)
+    return (Int(floor(xf)), Int(floor(yf)))
 end
 
 function get_tile(x, y, zoom)
-	url = "https://tile.openstreetmap.org/$zoom/$x/$y.png"
-	tmp_path = download(url)
-	tile = load(tmp_path)
-	return tile
+    url = "https://tile.openstreetmap.org/$zoom/$x/$y.png"
+    tmp_path = download(url)
+    tile = load(tmp_path)
+    return tile
 end
 
 function get_tile_by_lat_lon(lat, lon, zoom)
-	xtile, ytile = get_tile_xy(lat, lon, zoom)
-	return get_tile(xtile, ytile, zoom)
+    xtile, ytile = get_tile_xy(lat, lon, zoom)
+    return get_tile(xtile, ytile, zoom)
 end
 
 function get_meters_per_pixel(lat, zoom)
-	px_per_tile = 256
-	return 156543.03 * cos(lat) / (2^zoom)
+    px_per_tile = 256
+    return 156543.03 * cos(lat) / (2^zoom)
 end
 
 function get_map(lat, lon, zoom)
-	px_per_tile = 256
-	meters_per_pixel = get_meters_per_pixel(lat, zoom)
-	xf, yf = get_tile_xy_fraction(lat, lon, zoom)
-	x0, y0 = (Int(floor(xf)), Int(floor(yf)))
-	xpoint = 1 + px_per_tile + Int(floor((xf - x0) * px_per_tile))
-	ypoint = 1 + px_per_tile + Int(floor((yf - y0) * px_per_tile))
-	map = Array{RGB{N0f8}, 2}(undef, (px_per_tile * 3, px_per_tile * 3))
-	for i in -1:1
-		x = x0 + i
-		ioffset = 1 + (i + 1) * px_per_tile
-		for j in -1:1
-			y = y0 + j
-		    joffset = 1 + (j + 1) * px_per_tile
-			img = get_tile(x, y, zoom)
-			map[joffset:joffset+px_per_tile-1, ioffset:ioffset+px_per_tile-1] = img
-		end
-	end
-	draw!(map, Ellipse(CirclePointRadius(xpoint, ypoint, 6)),
-		  RGB{N0f8}(0.5, 0.0, 0.5))
-	return map, xpoint, ypoint
+    px_per_tile = 256
+    meters_per_pixel = get_meters_per_pixel(lat, zoom)
+    xf, yf = get_tile_xy_fraction(lat, lon, zoom)
+    x0, y0 = (Int(floor(xf)), Int(floor(yf)))
+    xpoint = 1 + px_per_tile + Int(floor((xf - x0) * px_per_tile))
+    ypoint = 1 + px_per_tile + Int(floor((yf - y0) * px_per_tile))
+    map = Array{RGB{N0f8}, 2}(undef, (px_per_tile * 3, px_per_tile * 3))
+    for i in -1:1
+        x = x0 + i
+        ioffset = 1 + (i + 1) * px_per_tile
+        for j in -1:1
+            y = y0 + j
+                joffset = 1 + (j + 1) * px_per_tile
+            img = get_tile(x, y, zoom)
+            map[joffset:joffset+px_per_tile-1, ioffset:ioffset+px_per_tile-1] = img
+        end
+    end
+    draw!(map, Ellipse(CirclePointRadius(xpoint, ypoint, 6)),
+          RGB{N0f8}(0.5, 0.0, 0.5))
+    return map, xpoint, ypoint
 end
 
 function get_realtime_data_file(station)
     station = uppercase(station)
-	url = "http://www.ndbc.noaa.gov/data/realtime2/$station.txt"
-	return download(url)
+    url = "http://www.ndbc.noaa.gov/data/realtime2/$station.txt"
+    return download(url)
 end
 
 function get_realtime_dataframe(station_name; timezone=tz"America/New_York")
-	station_fname = get_realtime_data_file(station_name)
+    station_fname = get_realtime_data_file(station_name)
     lines = open(station_fname) do file
         readlines(file)
     end
     dt_array = (y, mon, d, hr, min) -> (astimezone.(ZonedDateTime.(
         DateTime.(y, mon, d, hr, min), tz"UTC"), timezone))
-	deg_c_to_f = passmissing(x -> x * 9.0 / 5.0 + 32.0)
-	speed_ms_to_mph = passmissing(x -> 0.44704 * x)
+    deg_c_to_f = passmissing(x -> x * 9.0 / 5.0 + 32.0)
+    speed_ms_to_mph = passmissing(x -> 0.44704 * x)
     lines[1] = lstrip(lines[1], '#')
     data = join([lines[1:1]; lines[3:end]], "\n")
     df = CSV.read(IOBuffer(data), DataFrame; header=1, delim=" ",
                   ignorerepeated=true)
-	select!(df,
-		[:YY, :MM, :DD, :hh, :mm] => dt_array => :TIME,
-		:WDIR => x -> tryparsem.(Int, x),
-		:WSPD => x -> speed_ms_to_mph.(tryparsem.(Float32, x)),
-		:GST => x -> speed_ms_to_mph.(tryparsem.(Float32, x)),
-		:PRES => x -> tryparsem.(Float32, x),
-		:ATMP => x -> deg_c_to_f.(tryparsem.(Float32, x)),
-		:WTMP => x -> deg_c_to_f.(tryparsem.(Float32, x));
-		renamecols=false)
-	return df
+    select!(df,
+            [:YY, :MM, :DD, :hh, :mm] => dt_array => :TIME,
+            :WDIR => x -> tryparsem.(Int, x),
+            :WSPD => x -> speed_ms_to_mph.(tryparsem.(Float32, x)),
+            :GST => x -> speed_ms_to_mph.(tryparsem.(Float32, x)),
+            :PRES => x -> tryparsem.(Float32, x),
+            :ATMP => x -> deg_c_to_f.(tryparsem.(Float32, x)),
+            :WTMP => x -> deg_c_to_f.(tryparsem.(Float32, x));
+            renamecols=false)
+    return df
 end
 
 function plot_station_data(station_name, station_map, station_x, station_y,
                            df, i)
-  fig = Figure(resolution=size(station_map))
-  ax = CairoMakie.Axis(fig[1, 1])
-  hidespines!(ax)
-  hidedecorations!(ax)
-  plot_station_data_to_axis(ax, station_name, station_map,
-                            station_x, station_y, df, i)
-  return fig
+    fig = Figure(resolution=size(station_map))
+    ax = CairoMakie.Axis(fig[1, 1])
+    hidespines!(ax)
+    hidedecorations!(ax)
+    plot_station_data_to_axis(ax, station_name, station_map,
+                              station_x, station_y, df, i)
+    return fig
 end
 
 function plot_station_data_to_axis(ax, station_name, station_map, station_x, station_y,
                                    df, i)
-	obs_time = df.TIME[i]
-  obs_time_s = Dates.format(obs_time, "e, u d H:MM")
-	image!(ax, rotr90(station_map))
-  ax.title = "$station_name $obs_time_s"
-	wind_rad = deg2rad(90 - df.WDIR[1])
-	wind_mph = df.WSPD[i]
-	txt = @sprintf "Air: %.1f F, Water: %.1f F, Wind: %.1f mph" df.ATMP[i] df.WTMP[i] wind_mph
-	wind_vec = 50 * Vec2f(cos(wind_rad), sin(wind_rad)) * wind_mph / 10
-	tooltip!(ax, station_x, station_y, txt; offset=10)
-	arrows!(ax, [Point2f(station_x, station_y)], [wind_vec], fxaa=true,
-	        linewidth=2, align=:center, arrowhead='⟰')
-	return ax
+    obs_time = df.TIME[i]
+    obs_time_s = Dates.format(obs_time, "e, u d H:MM")
+    image!(ax, rotr90(station_map))
+    ax.title = "$station_name $obs_time_s"
+    wind_rad = deg2rad(90 - df.WDIR[1])
+    wind_mph = df.WSPD[i]
+    if ismissing(wind_mph) || ismissing(wind_rad)
+        wind_mph = 0.0
+        wind_rad = 0
+    end
+    atmp = df.ATMP[i]
+    wtmp = df.WTMP[i]
+    if ismissing(atmp)
+        atmp = 0.0
+    end
+    if ismissing(wtmp)
+        wtmp = 0.0
+    end
+    txt = @sprintf "Air: %.1f F, Water: %.1f F, Wind: %.1f mph" atmp wtmp wind_mph
+    wind_vec = 50 * Vec2f(cos(wind_rad), sin(wind_rad)) * wind_mph / 10
+    tooltip!(ax, station_x, station_y, txt; offset=10)
+    arrows!(ax, [Point2f(station_x, station_y)], [wind_vec], fxaa=true,
+            linewidth=2, align=:center, arrowhead='⟰')
+    return ax
 end
 
-function save_animation(station_name, out_path, days, real_hour_per_animation_second=1)
+function save_animation(station_name, out_path, hours, real_hour_per_animation_second)
     lat, lon = get_station_lat_lon(station_name)
     station_map, station_x, station_y = get_map(lat, lon, 14)
     df = get_realtime_dataframe(station_name; timezone=tz"America/New_York")
-    diff_hours = (df.TIME[0] - df.TIME[1]).value / 1000 / 3600
-    fps = real_hour_per_animation_second / diff_hours
-    nframes = fps * days * 24 * 3600
+    diff_hours = (df.TIME[1] - df.TIME[2]).value / 1000 / 3600
+    stride = Int(ceil(real_hour_per_animation_second / diff_hours))
+    println("diff hours ", diff_hours)
+    println("data size ", size(df, 1))
+    println("stride ", stride)
+    end_index = Int(min(stride * hours + 1, size(df, 1)))
+    data_indexes = range(end_index, 1; step=-stride)
+    println("data indexes ", data_indexes)
 
     fig = Figure(resolution=size(station_map))
-    ax = Axis(fig[1, 1])
+    ax = CairoMakie.Axis(fig[1, 1])
     hidespines!(ax)
     hidedecorations!(ax)
 
-    record(fig, out_path, range(1, nframes); framerate=fps) do i
+    record(fig, out_path, data_indexes; framerate=1) do i
         plot_station_data_to_axis(ax, station_name, station_map,
-                                  station_x, station_y, df, nframes - i + 1)
+            station_x, station_y, df, end_index - i + 1)
     end
 end
 
@@ -157,16 +174,20 @@ function main()
     station_name = ARGS[1]
 
     out_fname = "$station_name.png"
-    if (length(ARGS) > 1)
+    if length(ARGS) > 1
         out_fname = ARGS[2]
     end
 
-    lat, lon = get_station_lat_lon(station_name)
-    station_map, station_x, station_y = get_map(lat, lon, 14)
-    df = get_realtime_dataframe(station_name; timezone=tz"America/New_York")
-    fig = plot_station_data(station_name, station_map, station_x, station_y,
-                            df, 1)
-    save("$station_name.png", fig)
+    if any(endswith.(out_fname, [".gif", ".webm", ".mp4", ".mkv"]))
+        save_animation(station_name, out_fname, 24, 1)
+    else
+        lat, lon = get_station_lat_lon(station_name)
+        station_map, station_x, station_y = get_map(lat, lon, 14)
+        df = get_realtime_dataframe(station_name; timezone=tz"America/New_York")
+        fig = plot_station_data(station_name, station_map, station_x, station_y,
+                                df, 1)
+        save(out_fname, fig)
+    end
 end
 
 main()