Meteorological Aviation Routines (METARS) are
detailed observations at airfields around the world.
Once again, NOAA are gracious in sharing it.
New Zealand METARS are updated hourly and available for
Auckland,
Wellington and
Christchurch.
Here is a code cracker.

Brilliant airservices.gov.au
UTC time check
NZ TAFS
NZAA METARS plus
NZWN METARS plus
NZCH METARS plus

Wx Fax list includes ...

Analysis: MSLP 850hPa wind 700hPa wind 500hPa wind Prognosis valid 0000: MSLP 850hPa 700hPa 500hPa 250hPa

SIGWX: 0100 valid 1800 0700 valid 0000 1300 valid 0600 1900 valid 1200 International SIGMETS

NOAA SIGWX faxes

NOAA about TIFF viewer software

IrfinView ... the ultimate image viewer plus, and it's freeware

"QuickTime Interferes with TIFF Viewing!" That's an under-statement. Remove the offending plugins this way.

Microsoft Knowledge Base Article - 319829 - Cannot Open a Tagged Information File Format (TIFF) File in Internet Explorer

Index to NOAA collection of weather faxes as TIF files
Here's my selection:
SIG WX PROG chart, NZ and Antarctica
SIG WX PROG chart, NZ and West Pacific
SIG WX PROG chart, NZ and Nor-west to Mediterranean, nearer VT
SIG WX PROG chart, NZ and Nor-west to Mediterranean

BOM help for Aviation codes

Airways Corp pre-flight briefing - great but you have to register.