Wednesday, November 15, 2017

Sky and Ground Thermal Observation for NearSys Station, 15 November 2017

At 6:15 PM MDT, it's drizzling at NearSys Station and we're 100% overcast with nimbostratus. The Seek Reveal thermal imager indicated the ground temperature was 24*F and the sky temperature was 14 *F. Assuming a moist adiabatic lapse rate of 3.0 *F, the clouds overhead have a base of 3,300 feet.

There's currently no METAR for the Caldwell airport (KEUL) to cross check this estimate of cloud base height.

This blog entry was updated to correct for the error of using the dry adiabatic lapse rate.

Tuesday, November 14, 2017

All Sky Photometer for NearSys Station, 14 November 2017

All sky photometer data was collected starting at 5:44 AM MST. Below is a chart of the data collected. It's apparent that a cloud passed overhead starting at about 2:30 PM.

Sunday, November 12, 2017

Background Neutron Radiation for NearSys Station, 12 November 2017

After 159 hours of observation, five bubbles appeared in the neutron bubble detectors. That's a thermal background rate of 1.57 microrem per hour of thermal neutron radiation.

Saturday, November 11, 2017

Visibility for NearSys Station, 11 November 2017

UAVSonde images were collected over NearSys Station at 8:00 AM MST. The images indicate visibility was in excess of 50 miles.

Looking West

Looking South

Looking East
Looking North

UAVSonde Data for NearSys Station, 11 November 2017

UAVSonde data was collected at 8:00 AM MST. Here are the data.

Altitude: 2,280 feet
Temperature: 57 *F
Relative Humidity: 100%
Pressure: 916.1 mb

Altitude: 2,673 feet
Temperature: 57 *F
Relative Humidity: 100%
Pressure: 927.3 mb

There were a lot of low pressure readings on the ground and those pulled the average low.

Friday, November 10, 2017

Ground and Sky Observation for NearSys Station, 10 November 2017

It's raining at NearSys Station. A thermal observation was taken at 4:30 PM MST that indicated the ground had a temperature of 26 *F and the sky a temperature of 15 *F. Since It was raining, a moist adiobatic lapse rate of 3 *F was assumed.

A temperature difference of 11 *F determines the base of the clouds are at an altitude of 3,700 feet. The Boise METAR reported clouds at 4,000 feet.

Thermal image of nimbostratus clouds over NearSys Station.

Wednesday, November 8, 2017

All Sky Photometer for NearSys Station, 7 November 2017

The new photometer collected data all day on the 7th and this time without rain interfering. Below is the chart of the data collected.

Spiky variations in the data are due to passing clouds.