Wednesday, January 17, 2018

Sky and Ground Thermal Observation for NearSys Station, 17 January 2018

It's overcast and dark at 7:30 PM MST, so I can't see the clouds making the sky overcast.

The ground temperature is 15*F. The clouds have a temperature between -8 and -10*F. Assuming a dry adiabatic lapse rate of 5.4 degrees per thousand feet, the height of the clouds is between 4,300 and 4,600 feet.

Colder patches in the clouds have a temperature of -15*F. The makes their height 5,600 feet.

I can't see the clouds, so I don't know if the thermal imager is detecting openings or higher portions of the clouds.

All Sky Photometer for NearSys Station, 17 January 2018

It was an overcast but dry day at NearSys Station. The clouds thinned out briefly around 2:00 PM MST.

Visibility for NearSys Station, 17 January 2018

The UAVSonde flight at 4:30 PM MST indicated the visibility was at least 50 miles.

Looking east

Looking north

Looking south

Looking west

Monday, January 15, 2018

Thermal Images at Oceanside, California

On the way back home, I made a quick stop at the beach in Oceanside to see what the kand, sea, and air looks like I'm clear, sunny skies.

The dark rocks are warmer than the sand and the water is cooler than the beach. The air just above the waves is warmer than the ocean water.

Looking northwest.

The dry sand is cooler than the damp sand. And I can see the air immediately above the ocean is warmer than the water.

Looking west into the Pacific Ocean.


Sunday, January 7, 2018

All Sky Photometer for NearSys Station, 7 January 2018

Dense fog all day at NearSys Station, we never saw the sun or sky.


Visibility for NearSys Station, 7 January 2018

NearSys Station is socked in with fog. The visibility is only 1/2 mile.


A drive to town discovered that the overhead clouds were only 400 feet above NearSys Station.

Friday, January 5, 2018

Ground and Sky Thermal Observation for NearSys Station, 5 January 2018

A thermal measurement of the ground and sky was made at 9:15 AM MST. Most interesting was not the height of the cloud bsse, but the variation in the cloud height.

The warmest, lowest portion of the clouds had a temperature of 7 degrees F. The coolest, higher portion of the clouds had a temperature of 0 degrees F.

Assuming a dry adiabatic lapse rate of 5.4 degrees per thousand feet, the variation in the cloud height was 1,300 feet.

NearSys Station is covered in stratocumulus. The inversion is inally being cleared out of the valley.

A higher altitude region between cumulus cloud puffs.

The bottom surface of a cumulus cloud.