La Crosse Technology WS-8349U Instruction Manual page 13

The weather forecasting feature is estimated to be 75% accurate. The weather forecast is based
solely upon the change of air pressure over time. The WS-8349U averages past air-pressure
readings to provide an accurate forecast, creating a necessity to disregard all weather forecasting
for 12-24 hours after the unit has been set-up, reset, or moved from one altitude to another (i.e.
from one floor of a building to another floor). In areas where the weather is not affected by the
change of air pressure, this feature will be less accurate.
Weather Icons
There are 3 possible weather icons that will be displayed in the LCD 2:
Sunny—indicates that the weather is expected to improve (not that the weather will be sunny).
Sun with Clouds—indicates that the weather is expected to be fair (not that the weather will be
sunny with clouds).
Clouds with Rain—indicates that the weather is expected to get worse (not that the weather will
be rainy).
The weather icons change when the unit detects a change in air pressure. The icons change in
order, from "sunny" to "partly sunny" to "cloudy" or the reverse. It will not change from "sunny"
directly to "rainy", although it is possible for the change to occur quickly. If the symbols do not
change then the weather has not changed, or the change has been slow and gradual.
Weather Tendency Arrows
Other possible displays in LCD 2 are 2 weather tendency arrows, one that points up (on the left
side of the forecast) and one that points down (on the right side of the forecast). These arrows
reflect current changes in the air pressure. An arrow pointing up indicates that the air pressure is
increasing and the weather is expected to improve or remain good. An arrow pointing down
indicates that the air pressure is decreasing and the weather is expected to become worse or
remain poor. No arrow means the pressure is stable.
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