AMES AVI - Aviation Automatic Weather Observation System

But airport meteorological system is special for many reasons:

it uses a lot more sensors than ordinary meteorological system
sensors are necessary to be of the highest accuracy and quality
hardware, software and database need to be redundant
capturing of the data and reporting interval is more frequent
a lot of calculated data in airport meteorological systems is authentic
special observations are reported if weather conditions change rapidly or cross thresholds
there are far more various displays of data:
it has an option for adding comments manually
it automatically generates and sends reports and has an option to do it manually
it show tendecy for several parameters and makes forecasting easier

Basic meteorological parameters in an airport meteorological system are:

Technical data

WIND SPEED
Measuring ranges	0 m/s .. 60 m/s
Starting speed	0.5 m/s
Accuracy and linearity	+/- 0.5 m/s
Resolution	0.1 m/s
WIND DIRECTION
Measuring ranges	0° .. 360°
Starting speed	0.5 m/s
Accuracy and linearity	+/- 5°
Resolution	5°
AIR TEMPERATURE/RELATIVE HUMIDITY
Temp range	-40°C .. +60°C
Accuracy	+/- 0.15°C
Resolution	+/- 0.15°C
Humidity	0% .. 100%
Accuracy	+/- 2%
PRESSURE SENSOR
Measuring ranges	50 .. 1100 hPa
Accuracy	+/- 0.25 hPa
Resolution	0.1 hPa
VISIBILITY SENSOR
Measuring ranges	10m .. 75km
Measurement Error	<=1.3% at 600m, <=1.8% at 1,500m, <=2.0% at 2km, <=8.3% at 15km <=10.5 at 30km
Measurement principle	Forward scatter meter with 39° to 51° angle
PRECIPITATION SENSOR
Measuring area	500cm2, +/- 2 cm2
Measuring ranges	0 mm/h .. 100 mm/h (0 l/h .. 5 l/h)
Resolution	0.1 mm (5ml)
CEILOMETER
Measuring ranges	0 .. 7500m
Resolution	10m
Accuracy	Greater of ±10 m or ±1% of height (against reflector)
Cloud Layers	3