AIM
4/20/23
7
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1
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27
Meteorology
2
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%).
3
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
−
1.
Details concerning the content, format, and symbols of the various data link products provided should be obtained from
the specific avionics manufacturer.
2.
NOTAM
−
D and NOTAM
−
FDC products broadcast via FIS
−
B are limited to those issued or effective within the past 30
days.
TBL 7
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1
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4
Product Parameters for Low/Medium/High Altitude Tier Radios
Product
Surface Radios
Low Altitude Tier
Medium Altitude
Tier
High Altitude Tier
CONUS NEXRAD
N/A
CONUS NEXRAD
not provided
CONUS NEXRAD
imagery
CONUS NEXRAD
imagery
Winds & Temps
Aloft
500 NM look
−
ahead
range
500 NM look
−
ahead
range
750 NM look
−
ahead
range
1,000 NM look
−
ahead range
METAR
100 NM look
−
ahead
range
250 NM look
−
ahead
range
375 NM look
−
ahead
range
CONUS: CONUS
Class B & C airport
METARs and 500
NM look
−
ahead
range
Outside of CONUS:
500 NM look-ahead
range
TAF
100 NM look
−
ahead
range
250 NM look
−
ahead
range
375 NM look
−
ahead
range
CONUS: CONUS
Class B & C airport
TAFs and 500 NM
look
−
ahead range
Outside of CONUS:
500 NM look-ahead
range
AIRMET, SIGMET,
PIREP, and SUA/
SAA
100 NM look
−
ahead
range. PIREP/SUA/
SAA is N/A.
250 NM look
−
ahead
range
375 NM look
−
ahead
range
500 NM look
−
ahead
range
Regional NEXRAD
150 NM look
−
ahead
range
150 NM look
−
ahead
range
200 NM look
−
ahead
range
250 NM look
−
ahead
range
NOTAMs D, FDC,
and TFR
100 NM look
−
ahead
range
100 NM look
−
ahead
range
100 NM look
−
ahead
range
100 NM look
−
ahead
range
7
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1
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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 format and coding of these observations are contained in paragraph 7
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1
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28 , Key
to Aviation Routine Weather Report (METAR) and Aerodrome Forecasts (TAF).
b. Automated Weather Observing System (AWOS).