background image The Transmission Interval is the amount of time within which a new or updated product transmission must be completed (95%) and the rate or repetition interval at which the product is rebroadcast (95%). The transmission and update intervals for the expanded set of basic meteorological products may be adjusted based on FAA and vendor agreement on the final product formats and performance requirements. NOTE - Details concerning the content, format, and symbols of the various data link products provided should be obtained from the specific avionics manufacturer. NOTAM - D and NOTAM - FDC products broadcast via FIS - B are limited to those issued or effective within the past 30 days. TBL 7 - - Product Parameters for Low/Medium/High Altitude Tier Radios Product Surface Radios Low Altitude Tier Medium Altitude Tier High Altitude Tier CONUS NEXRAD CONUS NEXRAD CONUS NEXRAD CONUS NEXRAD not provided imagery imagery Winds & Temps 500 NM look - ahead 500 NM look - ahead 750 NM look - ahead 1,000 NM look - Aloft range range range ahead range METAR 100 NM look - ahead 250 NM look - ahead 375 NM look - ahead CONUS: CONUS range range range Class B & C airport METARs and 500 NM look - ahead range Outside of CONUS: 500 NM look-ahead range TAF 100 NM look - ahead 250 NM look - ahead 375 NM look - ahead CONUS: CONUS range range range Class B & C airport TAFs and 500 NM look - ahead range Outside of CONUS: 500 NM look-ahead range AIRMET, SIGMET, 100 NM look - ahead 250 NM look - ahead 375 NM look - ahead 500 NM look - ahead PIREP, and SUA/ range. PIREP/SUA/ range range range SAA SAA is N/A. Regional NEXRAD 150 NM look - ahead 150 NM look - ahead 200 NM look - ahead 250 NM look - ahead range range range range NOTAMs D, FDC, 100 NM look - ahead 100 NM look - ahead 100 NM look - ahead 100 NM look - ahead and TFR range range range range - - 10. Weather Observing Programs a. Manual Observations. With only a few exceptions, these reports are from airport locations staffed by FAA personnel who manually observe, perform calculations, and enter these observations into the (WMSCR) communication system. The [1]format and coding of these observations are contained in paragraph 7 [2]- [3]1 [4]- [5]28 , Key to Aviation Routine Weather Report (METAR) and Aerodrome Forecasts (TAF). b. Automated Weather Observing System (AWOS). Meteorology - - References 1. file:///media/stevei/plnkx/aspirations/go-faraim/work/src/faraim/faa/aim/549/aim-549.html#0 2. file:///media/stevei/plnkx/aspirations/go-faraim/work/src/faraim/faa/aim/549/aim-549.html#0 3. file:///media/stevei/plnkx/aspirations/go-faraim/work/src/faraim/faa/aim/549/aim-549.html#0 4. file:///media/stevei/plnkx/aspirations/go-faraim/work/src/faraim/faa/aim/549/aim-549.html#0 5. file:///media/stevei/plnkx/aspirations/go-faraim/work/src/faraim/faa/aim/549/aim-549.html#0