Bug: multiple exceptions raised at the same time

[rndsrc]

When running ucast --site [SITE] --latest [DIR], the follow error may occur:

Connection timed out.  Retrying...
20210401_00:00:00:  99%|██████████████████████████████████████████████████████████████████████████████████████████▏ | 207/209 [31:27<00:18,  9.12s/it]
Creating "./20210401_00:00:00" ...Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 438, in _error_catcher
    yield
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 764, in read_chunked
    self._update_chunk_length()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 694, in _update_chunk_length
    line = self._fp.fp.readline()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/socket.py", line 669, in readinto
    return self._sock.recv_into(b)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/ssl.py", line 1241, in recv_into
    return self.read(nbytes, buffer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/ssl.py", line 1099, in read
    return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/models.py", line 753, in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 572, in stream
    for line in self.read_chunked(amt, decode_content=decode_content):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 793, in read_chunked
    self._original_response.close()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/response.py", line 443, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='nomads.ncep.noaa.gov', port=443): Read timed out.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/ckc/Library/Python/3.8/bin/ucast", line 33, in <module>
    sys.exit(load_entry_point('ucast', 'console_scripts', 'ucast')())
  File "/Users/ckc/Library/Python/3.8/lib/python/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/Users/ckc/Library/Python/3.8/lib/python/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/Users/ckc/Library/Python/3.8/lib/python/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/ckc/Library/Python/3.8/lib/python/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/Users/ckc/Codes/focisrc/ucast/mod/ucast/__main__.py", line 52, in ucast
    save(outfile, mkdf(site, cycle))
  File "/Users/ckc/Codes/focisrc/ucast/mod/ucast/utils.py", line 42, in ucast_dataframe
    gfs = uc.gfs.GFS(site, cycle, hr_forecast)
  File "/Users/ckc/Codes/focisrc/ucast/mod/ucast/weather/gfs/core.py", line 33, in __init__
    r = request(data_url(site, cycle, product, gridsz))
  File "/Users/ckc/Codes/focisrc/ucast/mod/ucast/request.py", line 44, in request
    r = requests.get(url, timeout=(ctime, rtime))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/sessions.py", line 697, in send
    r.content
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/models.py", line 831, in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/models.py", line 760, in generate
    raise ConnectionError(e)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='nomads.ncep.noaa.gov', port=443): Read timed out.

[wumpus]

Take a peek at https://github.com/wumpus/eht-met-forecast/blob/master/eht_met_forecast/gfs.py function fetch_gfs_download() ... you need all of that stuff for it to be reliable.