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Location
¾ mile WNW of Apache Trail and Ellsworth Rd. in east Mesa, Arizona
33° 25' 9" N , 111° 38' 42" W   elevation 1518 ft.

Most weather info on this web site comes from sensors located at
my residence in Twin Knolls neighborhood, east Mesa, Arizona.
The county weather is provided by Maricopa County,
and the state weather is provided by the National
Weather Service in Phoenix.
The info on the East Valley Weather page
is sourced as noted on the page

The current weather is usually updated every 30 minutes.

I'm a co-operative observer for the National Weather Service and
report daily temperature and rainfall data for east Mesa.
        Co-op ID : 02-2782-06
        NWS Station ID : EMSA3
        NWS Station Name : East Mesa

Weather Instruments
The temperature and humidity sensors are suspended 5 feet above ground
in a former NWS weather shelter located about 25 feet from my house.

A Rainwise WS1000CC Weather Station is the source
for all web site temperature, humidity, and wind data.
A P266 Toshiba Tecra 550 monitors the weather station and updates the website.
The software used to read data from the weather station, create the HTML files
and graphics, and upload them to the website was written by me using
Quick Basic 5, Visual Basic 6, and Transoft Script Performer.

Rain Gauge
Rainwise WS1000CC
8 inch collector size - resolution 0.01"
This gauge is mounted on a post about 12 feet from the weather shelter.
It's the source for all web site current rainfall ammounts.

National Weather Service rain gauge.
8 inch collector - resolution 0.01"
Daily rainfall totals are taken from this gauge.

Anemometer
Wind speed and direction are measured at the highest point on the roof.

Thermometer Accuracy
A 12" mercury thermometer is used annually to verify calibration.

Rain Gauge accuracy
The Rainwise WS1000CC meets NWS standards
and has proven to be very accurate
even at high rainfall rates. Current rainfall
totals are reported by this instrument.
Daily rainfall totals are taken from a
standard rain gauge with an 8 inch collector size
provided by the National Weather Service.
For this reason, daily rain totals may differ
from the hourly reported totals.

Contact
You can email me at Ross@AZWeather.com