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Weather MicroServer 23
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Columbia Weather Systems, Inc.
Measurements Definition
Sample Timestamp
Definition: Time and date of measurement
XML parameter: mtSampTime
Windspeed
Definition: 3 second rolling average of 250 millisecond samples
XML parameter: mtWindspeed
Units: MPH
Raw Wind Direction
Definition: 3 second rolling average of 250 millisecond samples
XML parameter: mtRawWindDir
Units: Degrees
Adjusted Wind Direction
Definition: Raw wind direction corrected for North
XML parameter: mtAdjWindDir
Units: Degrees
3 Second Rolling Average Wind Speed
Definition: 3 second rolling average of wind speed reading
XML parameter: mt3SecRollAvgWindSpeed
Units: MPH
3 Second Rolling Average Wind Direction
Definition: 3 second rolling average of adjusted wind direction reading
XML parameter: mt3SecRollAvgWindDir
Units: Degrees
2 Minute Rolling Average Wind Speed
Definition: 2 minute rolling average of wind speed reading
XML parameter: mt2MinRollAvgWindSpeed
Units: MPH
2 Minute Rolling Average Wind Direction
Definition: 2 minute rolling average of adjusted wind direction reading
XML parameter: mt2MinRollAvgWindDir
Units: Degrees
10 Minute Rolling Average Wind Speed
Definition: 10 minute rolling average of wind speed reading
XML parameter: mt10MinRollAvgWindSpeed
Units: MPH

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10 Minute Rolling Average Wind Direction
Definition: 10 minute rolling average of adjusted wind direction reading
XML parameter: mt10MinRollAvgWindDir
Units: Degrees
10 Minute Gust Wind Direction
Definition: 10 minute rolling wind direction at maximum wind speed.
XML parameter: mt10MinWindGustDir
Units: MPH
10 Minute Gust Wind Speed
Definition: 10 minute rolling maximum wind speed.
XML parameter: mt10MinWindGustSpeed
Units: MPH
10 Minute Gust Time
Definition: Gust time stamp during the last 10 minutes.
XML parameter: mt10MinWindGustTime
Units: date and time
60 Minute Gust Wind Direction
Definition: 60 minute rolling wind direction at maximum wind speed.
XML parameter: mt60MinWindGustDir
Units: MPH
60 Minute Gust Wind Speed
Definition: 60 minute rolling maximum wind speed.
XML parameter: mt60MinWindGustSpeed
Units: MPH
60 Minute Gust Time
Definition: Gust time stamp during the last 60 minutes.
XML parameter: mt60MinWindGustTime
Units: date and time
Temperature 1
Definition: One second temperature reading
XML parameter: mtTemp1
Units: ° F
Temperature 2
Definition: One second temperature reading (Capricorn/Pegasus only)
XML parameter: mtTemp1
Units: °F
Temperature 3

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Columbia Weather Systems, Inc.
Definition: One second temperature reading (Capricorn/Pegasus only)
XML parameter: mtTemp1
Units: ° F
Temperature 4
Definition: One second temperature reading (Capricorn/Pegasus only)
XML parameter: mtTemp1
Units: ° F
Relative Humidity
Definition: One second relative humidity reading
XML parameter: mtRelHumidity
Units: %
Solar Radiation
Definition: One second relative humidity reading (Capricorn/Pegasus
only)
XML parameter: mtSolarRadiation
Units: W/m­2
Wind Chill
Definition: Calculated using temperature 1 and wind speed.
XML parameter: mtWindChill
Units: ° F
Heat Index
Definition: Calculated using temperature 1 and relative humidity
XML parameter: mtHeatIndex
Units: °F
Dew Point
Definition: Calculated using temperature 1 and relative humidity
XML parameter: mtDewPoint
Units: °F
Degree Days:
Definition: Calculated using temperature 1
XML parameter: mtDegreeDay
Units: ° F
Average Temperature Today
Definition: Calculated using temperature 1
XML parameter: mtAvgTempToday
Units: °F
Degree Day Start
Definition: Start date for degree day calculation

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XML parameter: mtDegreeDayStart
Raw Barometric Pressure
Definition: One second barometric pressure reading
XML parameter: mtRawBaromPress
Units: Inches Hg
Adjusted Barometric Pressure
Definition: Raw barometric pressure with altitude and offset applied
XML parameter: mtAdjBaromPress
Units: Inches Hg
Density Altitude
Definition: Calculated using adjusted barometric pressure, temperature
1, relative humidity and altitude.
XML parameter: mtDensityAltitude
Units: Feet
Wet Bulb Globe Temperature
Definition: A composite temperature used to estimate the effect of
temperature, humidity, and solar radiation on humans. The MicroServer
uses an approximation formula.
XML parameter: mtWetBulbGlobeTemp
Units: ° F
Wet Bulb Temperature
Definition: Wet bulb temperature derived using a look up table of
temperature and relative humidity.
XML parameter: mtWetBulbTemp
Units: ° F
Saturated Vapor Pressure
Definition: The pressure of a vapor in equilibrium with its non­vapor
phases when air is saturated with water vapor.
XML parameter: mtSaturatedVaporPressure
Units: Inches Hg
Vapor Pressure
Definition: The pressure of a vapor in equilibrium with its non­vapor
phases.
XML parameter: mtVaporPressure
Units: Inches Hg
Dry Air Pressure
Definition: Barometric pressure minus vapor pressure.
XML parameter: mtDryAirPressure

Weather MicroServer 27
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Columbia Weather Systems, Inc.
Units: Inches Hg
Dry Air Density
Definition: The air's density depending on temperature and pressure.
XML parameter: mtDryAirDensity
Units: lbm/ft3
Wet Air Density
Definition: The air's density depending on temperature, humidity, and
pressure.
XML parameter: mtWetAirDensity
Units: lbm/ft3
Absolute Humidity
Definition: Actual amount of water vapor in the air.
XML parameter: mtAbsoluteHumidity
Units: lbm/ft3
Air Density Ratio
Definition: Dry air density with the added effect of water vapor
displacement of oxygen.
XML parameter: mtAirDensityRatio
Units: %
Adjusted Altitude
Definition: Calculated using dry air density. Used for horsepower
correction and prediction of vehicle performance.
XML parameter: mtAdjustedAltitude
Units: Feet
SAE Correction Factor
Definition: Society of Automotive Engineers (SAE) calculation using
temperature, pressure, and vapor pressure
XML parameter: mtSAECorrectionFactor
Units: none
Rain Today
Definition: Accumulated rain for the day in 0.01 inches increments
XML parameter: mtRainToday
Units: Inches
Rain this week
Definition: Accumulated rain for the week
XML parameter: mtRainThisWeek
Units: Inches
Rain this month

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Columbia Weather Systems, Inc.
Definition: Accumulated rain for the month
XML parameter: mtRainThisMonth
Units: Inches
Rain this year
Definition: Accumulated rain for the year
XML parameter: mtRainThisYear
Units: Inches
Rain Rate
Definition: Running 5­minute rain rate
XML parameter: mtRainRate
Units: Inches/Hour
Hail Today
Definition: Cumulative amount of hits against collecting surface for the
day
XML parameter: mtHailToday
Units: Hits/in2
Hail Rate
Definition: Running 5­minute hail rate
XML parameter: mtHailRate
Units: Hits/in2/hour
Extinction Coefficient
Definition: Franction of light lost to scattering and absorption
XML parameter: mtExtinctionCoefficient
Units: km ­1
Visibility
Definition: Visibility
XML parameter: mtVisibility
Units: miles
Lux
Definition: Day/Night meter
XML parameter: mtLux
Units: Lux
Windspeed -- Sensor 2
Definition: 3 second rolling average of 250 millisecond samples
XML parameter: mtWindspeed_2
Units: MPH
Raw Wind Direction -- Sensor 2

Weather MicroServer 29
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Definition: 3 second rolling average of 250 millisecond samples
XML parameter: mtRawWindDir
Units: Degrees
Adjusted Wind Direction -- Sensor 2
Definition: Raw wind direction corrected for North
XML parameter: mtAdjWindDir_2
Units: Degrees
3 Second Rolling Average Wind Speed -- Sensor 2
Definition: 3 second rolling average of wind speed reading
XML parameter: mt3SecRollAvgWindSpeed_2
Units: MPH
3 Second Rolling Average Wind Direction -- Sensor 2
Definition: 3 second rolling average of adjusted wind direction reading
XML parameter: mt3SecRollAvgWindDir_2
Units: Degrees
2 Minute Rolling Average Wind Speed -- Sensor 2
Definition: 2 minute rolling average of wind speed reading
XML parameter: mt2MinRollAvgWindSpeed_2
Units: MPH
2 Minute Rolling Average Wind Direction -- Sensor 2
Definition: 2 minute rolling average of adjusted wind direction reading
XML parameter: mt2MinRollAvgWindDir_2
Units: Degrees
10 Minute Rolling Average Wind Speed -- Sensor 2
Definition: 10 minute rolling average of wind speed reading
XML parameter: mt10MinRollAvgWindSpeed_2
Units: MPH
10 Minute Rolling Average Wind Direction -- Sensor 2
Definition: 10 minute rolling average of adjusted wind direction reading
XML parameter: mt10MinRollAvgWindDir_2
Units: Degrees
10 Minute Gust Wind Direction -- Sensor 2
Definition: 10 minute rolling wind direction at maximum wind speed.
XML parameter: mt10MinWindGustDir_2
Units: MPH
10 Minute Gust Wind Speed -- Sensor 2
Definition: 10 minute rolling maximum wind speed.

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XML parameter: mt10MinWindGustSpeed_2
Units: MPH
10 Minute Gust Time -- Sensor 2
Definition: Gust time stamp during the last 10 minutes.
XML parameter: mt10MinWindGustTime_2
Units: date and time
60 Minute Gust Wind Direction -- Sensor 2
Definition: 60 minute rolling wind direction at maximum wind speed.
XML parameter: mt60MinWindGustDir_2
Units: MPH
60 Minute Gust Wind Speed -- Sensor 2
Definition: 60 minute rolling maximum wind speed.
XML parameter: mt60MinWindGustSpeed_2
Units: MPH
60 Minute Gust Time -- Sensor 2
Definition: Gust time stamp during the last 60 minutes.
XML parameter: mt60MinWindGustTime_2
Units: date and time