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AIM

4/20/23

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27

Meteorology

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 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%).

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 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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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

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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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28 , Key

to Aviation Routine Weather Report (METAR) and Aerodrome Forecasts (TAF).

b. Automated Weather Observing System (AWOS).