Product

Update Interval

AIRMET

As Available (Typically 20 minutes) 

SIGMET/Convective SIGMET 

As Available (Typically 20 minutes), then at 15 minute intervals for 1 hour

METAR

1 minute (where available),
As Available otherwise (Typically ≤ 20 minutes)

CONUS NEXRAD

15 minutes

Regional NEXRAD

5 minutes (10 minutes for clear air mode)

NOTAM, PIREP, and SUA Status

As Available (Typically 20 minutes) 

TAF

8 Hours

Wind & Temperature Aloft

12 Hours