Weather Tendency Arrows; Storm Warning Alarm; Barometric Air Pressure Reading; Air Pressure History Bar Chart - La Crosse Technology WS-8025SU Instruction Manual

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.
H. Weather Tendency Arrows
Pressure trend arrow
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).
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 decreasing and the weather
is expected to become worse or remain poor.
6. No arrow means the pressure is stable.
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.
I.

Storm Warning Alarm

1. An alarm can be set to warn of a drop in air pressure.
2. Please follow the programming instructions in section F of the Detailed Set Up
Guide to activate this alarm
3. When the air pressure drops by the level set, an alarm will sound (if the alarm is
activted).
4. To cancel the alarm while sounding press any key.
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J. Air Pressure Tendency for Past Two Hours
The bar below the air pressure history chart displays the air pressure change over the past
two hours (values based on hPa change, 1 hPa equals 0.03 inHg).
K. 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 programming mode.
3. Please Follow the programming instructions in section F of the Detailed Set Up Guide to
set this feature.
4. To toggle between absolute and relative air pressure, press the "-" key.
L. Air Pressure History Bar Chart
1. The bar graph shows in hPa (Hekto Pascal) the recorded air pressure over the past 30-
hours.
2. The horizontal axis shows the hours at increments of -30 hours, -24 hours, -18 hours, -12
hours, -6 hours, -3 hours, -1 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.

MOUNTING

Note : Before permanently mounting, ensure that the indoor weather station is able to receive signals
from the transmitters and WWVB signal at the desired location. To achieve a true temperature reading,
avoid mounting the remote thermo/hygro sensor (or any sensor) where direct sunlight can reach the
remote sensor. We recommend that you mount the remote sensor on a North-facing wall or under an
eve. The sending range of the remote thermo/hygro sensor is 200 feet(60m) however obstacles such
as walls, concrete, and large metal objects can reduce the range. Place all units in their desired
location, and wait approximately 15 minutes before permanently mounting to ensure that there is
proper reception. If the indoor weather station loses the signal from the remote sensor, it will display
the last temperature reading for 15 minutes. After 15 minutes of not receiving any signals, the remote
temperature will display "- -.-".
A. Mounting the Remote Thermo/hygro Sensor
The remote thermo/hygro sensor can be mounted with the use of screws or by using the
adhesive tape.
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