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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.
1. Weather Icons
a. There are 3 possible weather icons that will be displayed at various
times in the center of the indoor weather station.
i
Sunny-indicates that the weather is expected to improve (not
that the weather will be sunny).
ii Sun with Clouds-indicates that the weather is expected to be
fair (not that the weather will be sunny with clouds).
iii Clouds with Rain-indicates that the weather is expected to get
worse (not that the weather will be rainy).
b. The weather icons change when the unit detects a change in air
pressure.
c. The icons change in order, from "sunny" to "sun with clouds" to
"clouds with rain" or the reverse.
d. It will not change from "sunny" directly to "clouds with rain", although
it is possible for the change to occur quickly.
e. If the symbols do not change, the weather has not changed (or the
change has been slow and gradual).
f. The sensitivity of the change in foreacst icon is set by the user in
section F of the Detailed Set Up Guide.
E. Weather Tendency Arrows
1. Along with the forecast icon there is a pressure tendency arrow.
2. There is one that points up (on the left side of the LCD) and one
that points down (on the right side of the LCD).
Pressure trend arrow
3. These arrows reflect current changes in the air pressure.
4. An arrow pointing up indicates that the air pressure is increasing
and the weather is expected to improve or remain good.
5. An arrow pointing down indicates that the air pressure is decreas-
ing and the weather is expected to become worse or remain poor.
6. No arrow means the pressure is stable.
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P.17
7. A storm can be expected if there is a drop of 4 hPa or more in less
than 6 hours. The clouds with rain icon will be displayed and the
tendency arrow that points down will be flashing-indicating the storm
warning feature has been activated. The flashing will stop when
the air pressure stabilizes or begins to rise.
F. Barometric Air Pressure Reading
1. The actual barometric air pressure is displayed directly under the
weather forecast icon
2. The relative air pressure is calibrated by the user through the pro-
gramming mode.
3. Please Follow the programming instructions in section F of the De-
tailed Set Up Guide to set this feature.
G. Air Pressure History Bar Chart
1. The bar graph shows in hPa (Hekto Pascal) the recorded air pres-
sure over the past 12-hours.
2. The horizontal axis shows the hours at increments of -12 hours, -9
hours, -6 hours, -3 hours, and 0 hours (current).
3. The vertical axis is set by hPa: the "0" on this axis represents the
current hPa, and + or - 1,3,5, or 7 shows (in hPa) how high or low
the past air pressure was as compared to the current one.
4. The "0" on the vertical axis indicates the current air pressure value.
5. The "0h" on the horizontal axis indicates the current hour, thus the
current air pressure also.
6. Each bar on the bar graph represents a value of 0.03 hPa, and
each bar also has a corresponding value on the verticle axis.
7. Air pressure trends can be determined by simply glancing at the
bar graph.
a. If the bars are rising (higher on the right than the left) then the
air pressure has a rising trend, and the weather should improve.
b. If the bars are dropping (lower on the right than the left) then the
air pressure has a falling trend, and the weather should worsen.
8. Multiply the two values to find past air pressure (note the + or - sign
of values on the verticle axis); i.e. 0.03 hPa x 3 = 0.09 hPa, now
add this value to the air pressure (in LCD 4) to evaluate what past
air pressures have been.
9. The bar chart will constantly scroll to avoid burnout of the LCD.
Note: This feature cannot be turned off.
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