World Meteorological Organization Working together in weather, climate and water Site Classification C. Bruce Baker, NOAA Vice President of CIMO WMO; Name of departmentwww.wmo.int WMO

3 Site Classification WMO Experimental focus: Quantify air temperature biases caused by proximity to artificial heating sources Quantify air temperature biases associated with sensor type and radiation shielding Air temperature measurements are made using both the NOAA US Climate Reference Network methodology and the National Weather Service Maximum Minimum Temperature Sensor system

1 Site Classification WMO Science Questons What are the differences in the measurement of temperature between the MMTS and the CRN systems as a function of solar radiation and wind speed for different siting classifications?? What are the differences in the measured temperatures between site classifications as a function of solar radiation and wind speed?? What is the magnitude of the local advection of heat and momentum for site classification of 5 vs 3??

Site Classification WMO 2 Siting Experiment Class 1: More than 100 m away from artificial heating sources, parking lots, roof tops... Class 2: More than 30 m away from artificial heating sources. Class 3: More than 10 m away from artificial heating sources. Class 4: Less than 10 m away from artificial heating sources. Class 5: on/near artificial heating sources.

1 Site Classification WMO

1 Site Classification WMO