UAVSonde Data, 1 April 2018

The UAVSonde was launched at 9:00 AM MST. It reported the following data.

On the ground,
Air Temperature: 50.8 F
Relative Humidity: 58.0%

At 400 feet AGL,
Air Temperature: 43.3 F
Relative Humidity: 58.2%

Weather Conditions for March at NearSys Station

Below are the weather conditions recorded at NearSys Station. A new weather station has permitted the recording of additional information.

Less than one inch of precipitation was recorded during March. Only one day saw snow.

The air pressure slightly increased (on average) during March.

The air temperature continued its slow climb.

There was a drop in the relative humidity during the third week of the month.

Cloud Altitude at NearSys Station, 24 March 2018

At 5:30 PM MST, NearSys Station was 100% overcast with stratus.

The UAVSonde reported the temperature at ground level was 51.6 F and the relative humidity was 19%. At 400 feet AGL, the air temperature was 49.0 F and the relative humidity was 19%. That's a lapse rate of 6.5 F per 1,000 feet.

According to the thermal imager, the ground temperature was 34 F and the clouds has a temperature of -8 F. Assuming a dry adiobatic lapse of 5.4 F per 1,000 feet, the clouds were at an altitude of 7,800 feet.

Thermal image of the stratus over NearSys Station

Visible image of the same clouds

According to the weather station, the air temperature is 53 F and the dew point is 19 F. Assuming a dry acrobatic lapse rate of 5.4 F per 1,000 feet, the clouds are at an altitude of 6,300 feet.

Averaging the two estimates, the status clouds over NearSys Station have a base altitude of 7,050 feet. According to Wikipedia, straits clouds are no higher than 6,500 feet (2,000 m).

Visibility at NearSys Station, 24 March 2018

The UAVSonde climbed to Flight Level 4 at 5:30 PM MDT. Based on the images returned, the visibility is greater than 50 miles.

Looking east

Looking north

Looking south

Looking west

24 Hour Temperature and Relative Humidity at NearSys Station, 20 March 2018

I left the datalogger on the front porch this time. It was protected from the worst of the weather and its data is not as accurate as a result.

A warm and dry breeze began at around 4:00 PM MDT and can be seen in the data.

UAVSonde Data for NearSys Station, 19 March 2018

The UAVSonde carried the new Amprobe temperature and relative humidity datalogger to an altitude of 400 feet AGL. Here is the data recorded.

At prop start:
Temperature = 54.9 F
Relative Humidity = 28.2%

At takeoff:
Temperature = 52.5 F
Relative Humidity = 29.5%

At 400 feet:
Temperature = 52.4 F
Relative Humidity = 26.4%

At descent:
Temperature = 51.9 F
Relative Humidity = 27.5%

So on average
Ground: 53.9 F and 28.9%
400 feet: 52.5 F and 27.0%

All Sky Photometer, 18 March 2018

The morning started clear than the afternoon, as can be seen in today's Photometer data.

Starting just before 2:00 PM MST, the sun began passing behind clouds.