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AIM 

6/17/21 

2.  Observations & Warnings (Obs/Warn). 

The Obs/Warn option provides an option to display 
weather data for the current time and the previous 
14 hours (rounded to the nearest hour). Users may 
advance through time using the arrow buttons or by 
clicking on the desired hour. Provided below are the 
Obs/Warn product tabs available on the GFA website: 

(a) 

METAR 

(b) 

Precipitation/Weather (PCPN/WX) 

(c) 

Ceiling & Visibility (CIG/VIS) 

(d) 

Pilot Reports (PIREP) 

(e) 

Radar & Satellite (RAD/SAT) 

3. 

The GFA will be continuously updated and 

available online at 

http://aviationweather.gov/gfa

Upon clicking the link above, select INFO on the top 
right corner of the map display. The next screen 
presents the option of selecting Overview, Products, 
and Tutorial. Simply select the tab of interest to 
explore the enhanced digital and graphical weather 
products designed to replace the legacy FA. Users 

should also refer to AC 00

45, 

Aviation Weather 

Services,

 for more detailed information on the GFA. 

4.  GFA Static Images.

 Some users with 

limited internet connectivity may access static 
images via the Aviation Weather Center (AWC) at: 

http://www.aviationweather.gov/gfa/plot

.

 There 

are two static graphical images available, titled 

Aviation Cloud Forecast

 and 

Aviation Surface 

Forecast

. The Aviation Cloud Forecast provides 

cloud coverage, bases, layers, and tops with Airmet 
Sierra for mountain obscuration and Airmet Zulu for 
icing overlaid. The Aviation Surface Forecast 
provides visibility, weather phenomena, and winds 
(including wind gusts) with Airmet Sierra for 
instrument flight rules conditions and Airmet Tango 
for sustained surface winds of 30 knots or more 
overlaid. These images are presented on ten separate 
maps providing forecast views for the entire CONUS 
on one and nine regional views which provide more 
detail for the user. They are updated every 3 hours and 
provide forecast snapshots for 3, 6, 9, 12, 15, and 
18 hours into the future. (See FIG 7

1

2 and 

FIG 7

1

3.) 

FIG 7

1

Aviation Surface Forecast 

7

1

Meteorology