Related: CWSU Center Weather Advisories Graphical-AIRMETs PIREPs TAFs Temp/Winds Aloft
Backend documentation for those wishing to script against this download portal.
Shapefile DBF schema:
Field 0: Type=C/String, Title='NAME' Combination of label and type fields
Field 1: Type=C/String, Title='LABEL' SIGMET label
Field 2: Type=C/String, Title='TYPE', One Character SIGMET type, always `C` at
this time.
Field 3: Type=C/String, Title='ISSUE', Issuance UTC Time
Field 4: Type=C/String, Title='EXPIRE', Expiration UTC Time
Field 5: Type=C/String, Title='PROD_ID', IEM NWS Text Product Identifier, which
can be used against the /api/1/nwstext/<PROD_ID> service.