Why isn't this WMS working?

HoloViews
1

I am trying to replicate the commented url1 with one from IEM :: Open GIS Consortium Web Services but I can’t seem to get anything to show. Any ideas?

import holoviews as hv
hv.extension("bokeh")

# url1 = "https://elevation.nationalmap.gov/arcgis/services/3DEPElevation/ImageServer/WMSServer?&service=WMS&request=GetMap&layers=3DEPElevation%3AHillshade%20Gray&styles=&format=image%2Fpng&transparent=false&version=1.3.0&width=256&height=256&crs=EPSG%3A3857&bbox={XMIN},{YMIN},{XMAX},{YMAX}"
url1 = "https://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/ridge.cgi?service=wms&version=1.1.1&request=GetMap&format=png&TRANSPARENT=TRUE&bgcolor=0xCCCCFE&BBOX={XMIN},{YMIN},{XMAX},{YMAX}&SRS=EPSG:3857&width=256&height=256&sector=RTX&prod=N0Q&layers=single-archive&year=2015&month=01&day=27&time=2303"
hv.Tiles(url1)
2 
import cartopy.crs as ccrs
import geoviews as gv
gv.extension("bokeh")
base_url = "https://nowcoast.noaa.gov/arcgis/services/nowcoast/radar_meteo_imagery_nexrad_time/MapServer"
url = base_url + "/WmsServer?service=WMS&request=GetMap&version=1.3.0&layers=1&image%2Fpng&transparent=true&crs=EPSG%3A3857&bbox={XMIN},{YMIN},{XMAX},{YMAX}&validtime=2015-12-01-T21:37:00.000Z"
print(url.format(XMIN=-20037507.539400,YMIN=1638517.444800,XMAX=20037260.918700,YMAX=7714669.394600))
overlay = gv.tile_sources.CartoLight() * gv.tile_sources.WMTS(url)
overlay.opts(global_extent=True)

This works