Index   465 -- Page 466 -- 467

7110.65R
AIM
AIM      CHG 2                                                                                           3/15/07
                                                                                                         5/26/16
                                                                                                        12/10/15


                                                  TBL 7-1-2
                       Product Parameters for Low/Medium/High Altitude Tier Radios

 Product              Surface Radios        Low Altitude Tier     Medium Altitude         High Altitude Tier
                                                                  Tier
 CONUS NEXRAD         N/A                   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


7-1-11. Weather Observing Programs                       ter to broadcast local, minute-by-minute weather data
                                                         directly to the pilot.
   a. Manual Observations. With only a few
exceptions, these reports are from airport locations     NOTE-
staffed by FAA personnel who manually observe,           When the barometric pressure exceeds 31.00 inches Hg.,
perform calculations, and enter these observations       see Paragraph 7-2-2 , Procedures, for the altimeter
                                                         setting procedures.
into the (WMSCR) communication system. The
format and coding of these observations are                   2. The AWOS observations will include the
contained in Paragraph 7-1-29 , Key to Aviation          prefix "AUTO" to indicate that the data are derived
Routine Weather Report (METAR) and Aerodrome             from an automated system. Some AWOS locations
Forecasts (TAF).                                         will be augmented by certified observers who will
                                                         provide weather and obstruction to vision informa-
  b. Automated Weather Observing System
                                                         tion in the remarks of the report when the reported
(AWOS).
                                                         visibility is less than 7 miles. These sites, along with
     1. Automated weather reporting systems are          the hours of augmentation, are to be published in the
increasingly being installed at airports. These          Chart Supplement U.S. Augmentation is identified in
systems consist of various sensors, a processor, a       the observation as "OBSERVER WEATHER." The
computer-generated voice subsystem, and a transmit-      AWOS wind speed, direction and gusts, temperature,


7-1-22                                                                                             Meteorology