After inspecting the temperature trend during the 16 day period it was observed that all the sources measured temperature in unison at night. Solar radiation during the daytime would cause differences in the temperature recorded depending upon the location of the thermistors. Some of the general observations gathered were: Upper stay thermistors record much higher temperature than lower stay thermistors. RWIS & METAR data show similar temperature trends. METAR data seem to have higher maximums and lower minimums. They both lag with respect to temperature of up to 3hrs or 20 F when compared to the stay thermistors. Embedded VWG segment thermistors have significantly lower maximum and higher minimum. In order to gain deeper insight into the temperature characteristics of the individual thermistors we decided to choose few example days and have a magnified view of their trends. March 15 and March 16 seemed to appear to represent more days in the bracket and hence chosen for the purpose. The weather data for those days were obtained from the National Weather Service which included the sunrise, sunset, maximum and minimum temperatures, sky cover and precipitation in inches. Table 34: Weather Report on March 15 Time Conversion Data Logger Clock RWIS Data Collected Local Time (EDT) (EST) (GMT) GMT + 04:00:00 GMT + 05:00:00 National Weather Service Report Local Information Comparison (March 15) Mean RWIS 2016 Sheath Parameter Time (EST) Value Time (EST) Air Thermistor Temperature Temperature Sunrise 6:46 AM 5:43 PM 73.9 F 75 F 6:42 PM Sunset Maximum 5: 43 PM 78 F Temperature 4:29 AM 62.6 F 62.5 F Minimum 4:29 AM 58 F Temperature 0.3 Average Sky * Sky Cover: The total amount of clouds
After inspecting the temperature trend during the 16 day period it was observed that all the sources measured temperature in unison at night. Solar radiation during the daytime would cause differences in the temperature recorded depending upon the location of the thermistors. Some of the general observations gathered were: Upper stay thermistors record much higher temperature than lower stay thermistors. RWIS & METAR data show similar temperature trends. METAR data seem to have higher maximums and lower minimums. They both lag with respect to temperature of up to 3hrs or 20 F when compared to the stay thermistors. Embedded VWG segment thermistors have significantly lower maximum and higher minimum. In order to gain deeper insight into the temperature characteristics of the individual thermistors we decided to choose few example days and have a magnified view of their trends. March 15 and March 16 seemed to appear to represent more days in the bracket and hence chosen for the purpose. The weather data for those days were obtained from the National Weather Service which included the sunrise, sunset, maximum and minimum temperatures, sky cover and precipitation in inches. Table 34: Weather Report on March 15 Time Conversion Local Time (EDT) Data Logger Clock (EST) RWIS Data Collected (GMT) GMT + 04:00:00 GMT + 05:00:00 National Weather Service Report (March 15) Local Information Comparison Parameter Time (EST) Value Time (EST) RWIS 2016 Air Temperature Mean Sheath Thermistor Temperature Sunrise Sunset 6:46 AM 6:42 PM 5:43 PM 73.9 F 75 F Maximum Temperature Minimum Temperature 5: 43 PM 4:29 AM 78 F 58 F 4:29 AM 62.6 F 62.5 F Average Sky 0.3 * Sky Cover: The total amount of clouds
134489_Draft%20Report.docx