Day 150: Infrared Satellite Imagery Over Arizona

Posted by pmarsh on 30 May 2010 | 1 comment

A few days ago, I blogged about a satellite signature (thermal couplet) that is indicative of an intense thunderstorm. This satellite signature is identifiable when using the infrared channel. This is because the infrared channel essentially measures the temperature of the object being viewed.

So, what does the satellite “see” in the infrared channel when there are no clouds in the sky? To examine this, take a look at the image above (and below), focusing on Arizona – which for the most part was sunny all day. You should quickly notice the extremely dark colors (indicating warmer temperatures) over most of the state. You might also notice the small sliver of cooler colors (indicating cooler temperatures) extending from northcentral to central to eastcentral Arizona. What is this? Answer below the picture.

The sliver of cooler temperatures is satellite “seeing” the tops of the mountains, which have a cooler surface temperature than the areas closer to sea-level.

What is really cool is to watch a twenty-four hour animation of infrared satellite imagery. You’ll see the colors of the southwest change during the day, going from the cooler colors during the night to the warmer colors during the day. Click here to view a current infrared satellite loop.

As for VORTEX II. They had a day for repairs, laundry, and mission reviews. Hopefully they’ll be back in operation soon – if Mother Nature cooperates.