DAVIS and Vantage Pro User manual

Vantage Pro Manual Page 3
WELCOME TO THE VANTAGE PRO . . . . . . . . . . . . . . 7
Vantage Pro Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Display & Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Console Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Multiple stations / Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
OPTIONAL S ENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . 9
OPTIONAL ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . 10
VANTAGE PRO CONSOLE INSTALLATION . . . . . . . . . 11
CABLED VANTAGE PRO CONSOLE INSTALLATION . . . . . 12
Powering your Vantage Pro . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Connecting the Cabled Vantage Pro to the
Integrated Sensor Suite (ISS) . . . . . . . . . . . . . . . . . . . . . . .13
Wireless Vantage Pro Installation . . . . . . . . . . . . . . . . . . . . . . .14
Powering your Wireless Vantage Pro . . . . . . . . . . . . . . . . . . . .14
Establishing reception between the Wireless Vantage Pro console
to the Integrated Sensor Suite (ISS) . . . . . . . . . . . . . . . . . .14
DISPLAYING THE VANTAGE PRO CONSOLE . . . . . . . . . . 15
Table & Shelf Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Wall Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
USING THE VANTAGE PRO CONSOLE
KEYBOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Using the Navigation Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
DISPLAY FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Entering & Exiting Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . .22
Setup Mode Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Setup Mode - Screen 1: Transmitters 22
23
Setup Mode - Screen 2: Selecting Transmitters23
Setup Mode - Screen 3: Retransmit 24
Setup Mode - Screen 4: Time & Date 24
Setup Mode - Screen 5: Latitude 24

Vantage Pro Manual Page 4
Setup Mode - Screen 6: Longitude 25
Setup Mode - Screen 7: Time Zone 25
Setup Mode - Screen 8: Daylight Savings Detection 25
Setup Mode - Screen 9: Daylight Savings Status 25
Setup Mode - Screen 10: Elevation 25
Setup Mode - Screen 11: Wind Cup Size 25
Setup Mode - Screen 12: Rain Collector 26
Setup Mode - Screen 13: Rain Season 26
Exiting Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
CURRENT WEATHER MODE . . . . . . . . . . . . . . . . . . . . . 26
Activating Weather Variables . . . . . . . . . . . . . . . . . . . . . . . . . .26
Wind Speed and Direction 27
Temperature 27
Humidity 27
Wind Chill 28
Dew Point 28
Barometric Pressure 28
UV (Ultraviolet Radiation) 29
Heat Indices 29
Rain “Year”, Rain “Month”, and Rain Rate 29
“Daily” and “Storm” Rain 30
Solar Radiation 31
ET (Evapotranspiration) 31
Selecting Units 32
To change the units for any variable: 32
HIGHS AND LOWS MODE . . . . . . . . . . . . . . . . . . . . . . . 33
Accessing Highs and Lows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Exit Highs and Lows screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
ALARMS MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Three special alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
ETo (Evapotranspiration) 35
Barometric Pressure 35
Time 35
Setting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Setting the Time Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Vantage Pro Manual Page 5
Clearing Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
GRAPH MODE 39
Entering and Exiting Graph Mode . . . . . . . . . . . . . . . . . . . . . . . 39
Using and Understanding the Graph Mode’s Features . . . . . . .39
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 41
DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
HUMIDITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
WIND S PEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
DIRECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
CHILL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
RAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
APPENDIX :
WEATHER DATA . . . . . . . . . . . . . . . . . . . . . . . . . . 47
WEATHER CONDITIONS MEASURED /CALCULATED . . . . . 47
Wind . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Apparent Temperature Measures . . . . . . . . . . . . . . . . . . . . . . .47
Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Dew-Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Barometric Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Solar Radiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
UV (Ultra Violet) Radiation . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
EvapoTranspiration (ET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Leaf Wetness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Soil Moisture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
REPAIR & W ARRANTY INFORMATION . . . . . . . . . . . 59

Page 6 Vantage Pro Console Manual
ONE YEAR LIMITED WARRANTY . . . . . . . . . . . . . . . . . . 59
QUESTIONS ? CALL THE DAVIS S ERVICE CENTER . . . . . 59
FCC P ART 15 CLASS B R EGISTRATION WARNING . . . . 60

Vantage Pro Manual Page 7
WE L C O M ET O T H E VA N T A G EPR O
Welcome to Davis Instruments’ Vantage Pro weather station console. The Van-
tage Pro console, part of the comprehensive Vantage Pro system, displays a
wealth of weather information -- up to ten weather variables simultaneously.
The Vantage Pro console is also a powerful weather computer, collecting, stor-
ing, and displaying historical data, including highs and lows, in graphical and
numerical formats.
The Vantage Pro also provides you with a forecast based on the latest meteoro-
logical algorithms. A quick glance at the graphical icons predicts the general
weather trend and a detailed forecast scrolls across the bottom of the screen,
letting you know what to expect!
Vantage Pro Formats
The Vantage Pro System is available in two formats: Cabled and Wireless.
• Cabled Vantage Pro System
The Cabled Vantage Pro system links the Integrated Sensor Suite (ISS)
sensor array to the console with standard four-conductor cable. The
Standard Vantage Pro system operates on AC power only (w/ battery
backup).
• Wireless Vantage Pro
The wireless Vantage Pro console receives data transmitted by radio
from the solar-powered (with battery backup)ISS. Neither the sensor
array, nor the console requires AC power in the wireless format.
1

Page 8 Vantage Pro Console Manual
Display & Keyboard
The Vantage Pro display and keyboard are designed for easy access to the most
important weather information.
The keyboard allows you to interact with the station computer, view current
and historical data, set and clear alarms, change station modes, enter calibra-
tion numbers, set up and view graphs, select sensors, read the forecast, and so
on. To learn more about the keyboard, see “Keyboard” on page 18.
The Large LCD display is your window on current and past environmental
conditions, as well as the place to find the forecast. The console LCD can dis-
play up to 10 weather variables at any one time. To learn more about the dis-
play’s features, see “Display Features” on page 19.
Console Modes
The Vantage Pro console operates in five different modes designed to give you
quick and easy access to the information you need:
• Setup
Setup mode is used to enter the time, date, calibration numbers, and
other information required for the processing and display of the weather
data.
• Current Data
Current data is the most common operation mode. In this mode you can
read the current weather information and access any weather data not
currently displayed using the keyboard.
• High / Low
The High and Low mode summaries are accessed using the High/Low
key.
• Alarm
Alarm mode allows the user to set, clear, and review alarm settings.
• Graph
Graph mode allows the user to access the advanced graphing capabili-
ties of the Vantage Pro weather computer.
For more information about using the console, see “Using the Vantage Pro
Console” on page 17 and following sections.
Multiple stations / Sensors
The Wireless Vantage Pro system is capable of receiving transmissions from up
to eight different transmitters. See “Optional Sensors” below.

Optional Sensors
Vantage Pro Manual Page 9
OP T IO N A LSE N S O R S
The Vantage Pro system is extremely flexible. The following optional sensors
enable calculation and measurement of specialized weather information. All
optional sensors are available from your dealer or may be ordered directly
from Davis Instruments. Please be aware that some options are available only
for wireless units.
• Solar Radiation Sensor
Enables you to measure and display solar irradiance. Also required for
calculating Evapotranspiration (see “Wind” on page 47).
Available for Cabled and Wireless stations. Requires Sensor Mounting
Shelf. See “Optional Accessories” on page 10.
• Ultraviolet (UV) Radiation Sensor
Enables you to measure and display UV wavelength irradiance.
Required for calculating the UV dose.
Available for Cabled and Wireless stations. Requires Sensor Mounting
Shelf. See “Optional Accessories” on page 10.
Note: The Wireless Vantage Pro console is capable of receiving signals from up to eight separate transmitter
stations, including:
• Wireless Integrated Sensor Suite
A complete sensor package including Rain, Temperature, Humidity,
Wind Speed and Direction, with options for Solar Radiation and UV sen-
sors. The Vantage Pro Console/Receiver accomodates one ISS transmit-
ter station.
• Wireless Temperature Station
Measures and transmits air temperature from a remote location to the
console. The Vantage Pro Console/Receiver accomodates up to eight
Wireless Temperature Stations.
• Wireless Temperature / Humidity Station
Measures and transmits air temperature and humidity from a remote
location to the console. The Vantage Pro Console/Receiver accomodates
up to eight Wireless Temperature/Humidity stations.
• Anemometer Transmitter Kit
Allows separation of anemometer from ISS to capture wind speed and
direction from a remote location. The Vantage Pro Console Receiver
accomodates one Anemometer Transmitter Kit.
• Wireless Soil Moisture / Temperature Station
Measures and transmits soil moisture and temperature data from up to
four sensors each. The Vantage Pro Console Receiver accomodates one
Soil Moisture / Temperature station.

Page 10 Vantage Pro Console Manual
• Wireless Leaf Wetness / Temperature Station
Measures and transmits leaf wetness and temperature data from up to
four sensors each. The Vantage Pro Console/Receiver accomodates one
Leaf Wetness/Temperature station.
Note: The Wireless Vantage Pro Console / Receiver can receive from up to eight transmitters. For example,
as listed above, you may configure your Wireless Vantage Pro system with one ISS, one Wireless Soil
Moisture / Temperature station, one Anemometer Transmitter Kit, three WirelessTemperature /
Humidity stations, and two Wireless Temperature stations.
OP T IO N A LAC C E S S O R IE S
The following accessories, designed for use with the Vantage Pro, are available
from your dealer or may be ordered directly from Davis Instruments.
• WeatherLink®for Vantage Pro™ Data Logger & PC Software
Logs data gathered by the Vantage Pro, downloads it to your PC, and
generates reports and graphical displays. Storage interval (1, 5, 10, 15,
30, 60, or 120 minutes) is set by the user. The data logger will store
approximately 2, 9, 18, 27, 53, 107, or 213 days worth of data depending
on the selected storage interval. Windows™-compatible software lets you
analyze, plot, print, sort, and summarize the data.
WeatherLink®for Vantage Pro™ includes data logger, eight foot cable ,
software, and manual. Requires IBM compatible PC running Windows
95, 98, 2000, ME, or NT and one free serial port.
• WeatherLink™ 8’ extension cord
Extends the distance between Vantage Pro console and computer to a
maxium of 48 feet (14.5 m).
• Solar Radiation Sensor/ UV Sensor Mounting Shelf
Required for mounting the optional Solar Radiation and / or UV Sen-
sors. The mounting shelf attaches to the ISS.
• Cigarette Lighter Power Adapter
Allows the Vantage Pro to draw power from a standard car cigarette
lighter.
Warning: Do not use an older Davis AC Power Adapter or older Davis Cigarette Lighter Adapter.
You will damage the circuitry inside the unit. Use only the Vantage Pro power adapters.
• Telephone Modem Adapter
Allows a dialup connection between the station and the computer.

Vantage Pro Manual Page 11
Chapter 2VA N T A G EPR O
CO N S O L E
IN S T A L L A T I O N
The Vantage Pro console is a precision instrument designed to give extremely
accurate readings. As with any precision instrument, care must be used in its
assembly and use. Although installation of the Vantage Pro console is relatively
simple, following the steps outlined in this chapter-- and assembling the Van-
tage Pro correctly from the start-- will ensure that you will enjoy all of its fea-
tures with a minimum of time and effort.

Vantage Pro Console Installation
Page 12 Vantage Pro Manual
CA B L E DVA N T A G EPR O CO N S O L EIN S T A L L A T I O N
The Cabled Vantage Pro is powered by 5-volt DC (direct current) with battery
backup. Power may be supplied by an AC adapter, or with Davis’ optional 12
to 5-Volt Car/Boat/RV power adapter. (See “Optional Accessories” on
page 10.)
• WARNING: The Vantage Pro system uses power differenly from the way older Davis stations did. Use only
a Davis Vantage Pro 9-volt power converter. Using an older Davis adapter will damage your Vantage Pro!
Powering your Vantage Pro
Because the Cabled Vantage Pro console supplies power to the sensor array
through the connecting cable, you must use the AC power adapter or the
optional Car/Boat/RV adapter to supply primary power. The three C-cell bat-
teries provide backup power and will operate the station for four to six weeks
only.
1. Insert the power adapter plug into the jack located on the right side of the console,
then plug the other end of the adapter into an appropriate power outlet.
The Vantage Pro should run through a brief self-test procedure. All the dis-
play segments on the LCD appear and the console will beep twice.
2. Insert the C-cell battery backup.
Remove the battery cover located on the back of the console. Insert 3 C bat-
teries into the battery channel, negative (or flat) terminal first. Push gently
on the last battery to seat all three in the channel and complete the circuit.

Cabled Vantage Pro Console Installation
Vantage Pro Manual Page 13
Note: To remove batteries, place the Vantage Pro Console face down on a flat, firm surface. Insert a finger-
tip between the two exposed batteries. Press the middle battery down toward the notch (toward the
“hidden” battery. This will relieve the tension on the first battery and allow you to withdraw it.
3. Replace the battery cover.
After power-up the Vantage Pro will automatically enter Setup Mode. Setup
mode will lead you through setting up and calibrating your station. See “Setup
Mode” on page 22.
Connecting the Cabled Vantage Pro to the
Integrated Sensor Suite (ISS)
The Vantage Pro comes with 40 feet of cable. Maximum cable length from ISS
to console is 1000 feet. See “Optional Accessories” on page 10 to purchase addi-
tional cable.
1. Gently insert the console end of the 4 conductor wire running from the ISS into the
console receptacle marked ISS until it clicks into place.
• WARNING: Do not force the connector into the receptacle.
2. Ensure that the ISS cable is not twisted through the access hole.
3. Test the connections between the ISS and the console.
Spin the wind cups and change the direction of the vane. If the ISS is pow-
ered and the connection between the ISS and the console is correct, you
should see the wind direction and speed fields changing. Tip the rain bucket
back and forth. You should see rain registering. Check the other fields to
ensure you’re receiving from them, too.

Vantage Pro Console Installation
Page 14 Vantage Pro Manual
Wireless Vantage Pro Installation
Powering your Wireless Vantage Pro
Because the Wireless Vantage Pro console does not supply power to the sensor
array, an AC adapter is not required to operate the console (although you may
use one if you wish).
1. Remove the battery cover from the back of the Vantage Pro console.
2. Insert 3 C-cell batteries as shown.
Insert the negative (or flat) terminal first. The Vantage Pro should run
through a brief self-test procedure. All the display segments appear and the
console will beep three times.
3. Replace the battery cover.
Note: Regarding Battery Use. Under normal circumstances, 3 C cell alkaline batteries should power your
wireless Vantage Pro console for approximately 1 year. Davis Instruments does not recommend using
rechargeable NiCad batteries with the Vantage Pro, because the Vantage Pro will not recharge them
and they will not last as long.
After powering up and running through its self-test mode, the Vantage Pro
console will automatically enter Setup Mode. Setup Mode will lead you
through setting up and calibrating your station. (See “Setup Mode” on
page 22.)
Establishing reception between the Wireless Vantage Pro console
to the Integrated Sensor Suite (ISS)
As you position your console, be aware of possible interference from cordless
phones and other items. To prevent interference, maintain a distance of 10 feet
between the Vantage Pro console and the cordless phone (handset and base).
Also, for best reception, avoid positioning the console near large metallic sur-
faces (e.g., most refrigerator surfaces).
Please test communications between the Console/Receiver and the ISS (or
other transmitter) BEFORE permanently mounting your ISS. Remember that
the ISS transmits packets every few seconds. Therefore, there may be a 2 to 3
second delay before the console display updates. For more information about
locating the sensor transmitter and testing reception, consult the ISS or other
transmitter manual.

Displaying the Vantage Pro Console
Vantage Pro Manual Page 15
DIS P L A Y I N GT H E VA N T A G EPR O CO N S O L E
You should place the Vantage Pro computer console indoors, in a location
where the keyboard is easily accessible and the display is easy to read. For
more accurate readings, follow these suggestions:
• Avoid placing the Vantage Pro console in direct sunlight. The casing heats up in
direct sunlight. This may cause erroneous readings and / or damage to the unit.
• Avoid placing the Vantage Pro console near radiant heaters or heating / air condi-
tioning ducts
•If you are mounting the Vantage Pro console on a wall, choose an inner or interior
wall. Avoid walls that heat up or cool down depending on the weather.
By changing the orientation of the kickstand, you may display the Vantage Pro
on a tabletop, set it on a shelf, or mount it on a wall.
Table & Shelf Display
The kickstand may be set at five different angles appropriate for different dis-
play angles.
1. Lean the kickstand out.
2. Slide the catch to arrest the kickstand in the appropriate angle.
Choose low angles (settings 1 & 2) for display on a coffee table or other low
area. Choose higher angles (settings 3 - 4) for display on a desk or shelf.
OPENING THE STAND FOR TABLE OR SHELF DISPLAY

Vantage Pro Console Installation
Page 16 Vantage Pro Manual
Wall Display
1. Hold the template provided here flat against the wall and use a pencil to mark the
location of the two keyholes.
If you are installing a standard Vantage Pro console with sensor cable run-
ning inside the wall, attach the console over an empty switch box.
<!-- get dimensions and make template --!>
2. Use an electric drill with a #29 (.136” or 3.5mm) drill bit to make pilot holes in these
locations.
3. Using a screwdriver, drive the two #8 x 3/4” pan head self-threading screws into the
wall. Leave at least 1/8” between the wall the the heads of the screws.
4. Retract the kickstand into its upright and locked position.
5. Slide the keyholes on the back of the console over the two screw heads.
AFFIXING TO AWALL

Vantage Pro Manual Page 17
US I N G T H E VA N T A G EPR O CO N S O L E
The Vantage Pro display and keyboard are designed for easy access to the most
important weather information. The large LCD display is your window on cur-
rent and past environmental conditions, as well as the place to find the forecast.
The keyboard allows you to interact with the station computer, view current
and historical weather information, set and clear alarms, change station modes,
enter calibration numbers, set up and view graphs, select sensors, read the
forecast, and so on.
CH A P T E R3

Chapter 3
Page 18 Vantage Pro Console Manual
KE Y B O A R D
To access the station’s many features, the Vantage Pro console possesses three
kinds of keys:
• Function keys
The six primary function keys,
TEMP (Temperature), HUM
(Humidity), WIND (Wind speed
and direction), RAIN YR (Total
Year Rain), UV (Ultra-Violet irra-
diance), and BAR (Barometer)
are used to access current
weather information. They lie in
the left side of the double key
column.
• Operation keys
The six operation keys lie on the
right side of the double column.
2ND, TIME, GRAPH, HI/LOW,
STATION, and DONE are used
to enter different console modes,
set and clear alarm values,
change measurement units,
select station transmitters, and so
on.
There is a special operation key,
the 2ND key, located in the
upper right hand corner of the
keypad.
• The 2nd key
The second key is used in conjuction with other keys to access alternate func-
tions. Above each function and operation key lies a legend identifying that
key’s alternate use. For example, FORECAST is listed above the TIME key. To
access the Vantage Pro’s forecast, press and release the 2nd key, then press and
release the TIME/FORECAST key.
• Navigation keys
The four navigation keys, two horizontal and two vertical, are arrayed in a
cross shape in the lower right corner of the console. The Navigation keys are
used to enter or change data, and to scroll between displays.
Using the Navigation Keys
You should become familiar with the use of these keys, since they serve many
purposes in operating the Vantage Pro. The Navigation keys are used the same
way, regardless of the current console mode.

Display Features
Vantage Pro Console Manual Page 19
Essentially, pressing the right or left navigation key activates the next (or previ-
ous) data field on the screen. The up and down navigation keys scroll through
digits or entries.
DIS P L A Y FE A T U R E S
The large LCD display is your window on current and past environmental con-
ditions, as well as the place to find the forecast.
The display is organized to maximize the information available to you. The
following section explains some of the features that may appear on your con-
sole.
1. Compass Rose
The wind rose displays the speed and direction of the current wind, as well
as the variation in the 10 minute dominant wind direction over the last 60
minutes
2. Graph and Hi / Low mode settings
Combinations of these indicators appear only when the Hi /Low or Graph
modes are selected.
Vantage Pro console display

Chapter 3
Page 20 Vantage Pro Console Manual
3. Forecast Icons
From left to right, these icons represent predicted snow, rain, clouds, partly
cloudy, and sun. The forecast is updated every hour.
4. Moon Phase Indicator
The moon phase indicator depicts the current phase of the moon.
5. Time / Sunrise Time
Time may be displayed in 12 or 24 hour format. Time of sunrise is also dis-
played in this field. (After 6 pm, sunrise for the following day is displayed.)
You must enter the correct latitude and longitude and time zone for your
location for the time of sunrise to be accurate.
6. Date / Sunset Time
Date may be displayed in day / month or month.day format. Time of sunset
is also displayed in this field. You must enter the correct latitude and longi-
tude and time zone for your location for the time of sunset to be accurate.
7. 2nd button indicator
The 2nd indicator icon lights when the 2nd button is pushed.
8. Barometric Trend Arrow
The barometric trend arrow displays the pressure trend in five dif-
ferent positions: strongly rising, rising, steady, falling, and strongly
falling.
The steeply rising (or falling) arrow indicates the pressure has
increased (or decreased) 0.06” Hg or more in three hours.
The shallow rising (or falling) arrow indicates the pressure has increased (or
decreased) 0.02” or more Hg, but less than 0.06” Hg over three hours.
A flat arrow indicates the pressure has changed less than 0.02” Hg in three
hours.
9. Graph Icon
The graph icon is always displayed next to the active weather vari-
able. The graph will always show that variable’s history according to
your settings.