ADDS - METARs Java Tool Help Page
click browser Back button to go back to the tool.
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By default, the tool loads with an icon at all locations where
there is data for the current hour. This icon is shaded green
for VFR (Visual Flight Rules), blue for MVFR (Marginal VFR), and
red for IFR (Instrument Flight Rules). The amount of cloudiness
(Clear, Scattered, Broken, Overcast) is also displayed by this
icon - view the legend for the plot key. Placing the cursor
over one of these icons causes a text message to appear which
reveals the cloud coverage/bases and visibility (the two main
ingredients which determine flight category - IFR/VFR/MVFR).
Next, zoom into your region of interest by clicking and holding the
left mouse button, then drag the mouse while continuing to keep the
mouse button depressed. This creates a "rubber-band"
which will be the zoom area. Then let go of the mouse button and
the tool will zoom into that region bounded by the red rectangle.
Now, you can turn on certain variables reported at airports such as
temperature, winds, altimeter setting, etc. by simply choosing which
variables from the checklist found near the center below the map.
If your zoom level causes too much data overlap, the tool will
eliminate lower priority sites in order to keep the map from becoming
a terrible clutter. If you want all sites no matter how cluttered
the display may be, then choose to show all sites (or more) using
the checkbox to the far right (below map).
Once you have choosen to display particular parameters such as
temperature or winds, then placing the cursor over a particular
station location will cause the full raw text METAR to appear.
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weather.gov 
