A - "7 Day Area
Forecast" - This
is the forecast for an area or zone that includes the point that was
clicked. This is NOT a point forecast. Temperatures will typically be
for a range of values representative of that area or zone.
B - "Forecast
at a Glance" - This
is a point forecast for a representative point in the forecast
zone or area that was selected by clicking on the map. This
forecast is not necessarily representative of your location,
even if you
are in the same forecast zone as this point. Values for
high and low temperature will be a single value, though locations
near this point could easily be a few degrees warmer or cooler.
The weather in the icons
tends to be overly pessimistic and doesn't reflect changes that
may occur within a 12-hour daytime or nighttime
period. For example, mostly cloudy becoming mostly sunny
would probably be represented as partly cloudy or mostly cloudy
by
an icon. If there is any fog at any time in a 12-hour
daytime or nighttime period, the icon will show fog for the entire
12-hour
daytime or nighttime period.
C - "Detailed
Point Forecast" - If
you click on this map, you will get a forecast for the point where you
clicked. This is
a point forecast from the nearest 1.8 mile by 1.8 mile
forecast grid. This is not an average forecast for a larger area
or zone. The "7
Day Area Forecast" becomes
the "7
Day Point Forecast". The "Forecast
at a Glance" now becomes a forecast for the point
you selected on the smaller thumbnail map.
D - "Current
Conditions" - This
is the latest weather report for a representative location
in the forecast zone or area that was selected by clicking
on the map. This is not necessarily the report nearest to the point selected.
E - "More
Local Wx:" - This
is a link to additional weather reports in the forecast area
or zone selected by clicking on the map. One or more of these
locations may be closer or more representative of the weather
in your location than the default location under "Current
Conditions".
F - "Additional
Forecasts and Information" - This
section constains links for additional information such
as for a forecast discussion, observed rainfall, or a zoomed-in fog/vis
satellite image.
G - "Radar
and Satellite Images" - This
section constains a link to the nearest radar and to an infrared
satellite image.
---Q--- When the percent chance of rain is shown on the small icons on the
top of the forecast, sometimes the percent chance of precip is in red
and sometimes in green.
Is there any significance to the color used?
---Answer--- It has to do with precipitation type....
green - rain only [liquid precip (no thunder)]
red - rain and thunderstorms [liquid precip (with thunder)]
purple - wintry mix/freezing rain
blue - snow [frozen precip (thunder or no thunder)]
The colors are going to be changed to "black".
---Q--- What does the down-pointing arrow beside the temp. mean?
---Answer--- temperature falling
It should only appear during the daytime (non-diurnal temperature pattern).
Conversely you might see an up arrow at night for rising temperatures.
Additional forecast-at-a-glance webpage help
www.weather.gov 
