Pinkmatter's FarEarth Global Observer presents a live view of Landsat imagery as it is downlinked by ground-stations around the world. If the ground is going to be colder than the tops of low clouds, this is the time of day when this will occur. It's useless at night, but IR imagery relies on emitted heat energy(detectable day or night if you have the right equipment). But first, review the following key points of what we have discussed in this section. Note that the resulting temperatures are in Kelvin. By gathering data at multiple wavelengths, we gain a more complete picture of the state of the atmosphere.

In order to identify the specific types of clouds from space, weather forecasters use visible and infrared imagery in tandem with each other.

Get a clear view of the ground with SWIR wavelengths that Secondly, the time of the image is 1131Z, right before sunrise. Click for transcript of Identifying Low Clouds and Fog at Night on Satellite Imagery, loop of infrared images of the Sahara Desert, completely absorbed by the clouds above it, short video (2:22) showing an infrared satellite simulator, Department of Energy and Mineral Engineering, Department of Materials Science and Engineering, Department of Meteorology and Atmospheric Science, Earth and Environmental Systems Institute, iMPS in Renewable Energy and Sustainability Policy Program Office, BA in Energy and Sustainability Policy Program Office, 2217 Earth and Engineering Sciences Building, University Park, Pennsylvania 16802. is based on the fact that measuring an object's infrared emission tells you something about its temperature. A temperature scale(in degrees Celsius) is depicted to the left of the image. The colors enable them to easily and quickly see features which are of special interest. The way an image is colored does not change the data it is presenting. Yet, when I look at the timely enhanced infrared image (2158Z), I wonder what they were talking about.

This concludes our discussion of infrared satellite imagery. Current weather reported at the station. Around 2150Z (6:50 P.M. local time) on July 17, 2007, a TAM Airlines Airbus A320 crashed trying to land at Sao Paulo, Brazil. Now let’s look at Point B, located in the area of "feathery" clouds over the Atlantic. With all this talk about infrared satellite images, I thought that I would list some website where you can get various flavors of infrared imagery. PRESENTER: Detection of low clouds and fog using infrared imagery can sometimes be tricky at night and early in the morning because one of the main assumptions that forecasters use when interpreting infrared images – that temperatures decrease with increasing height – isn’t always true. 8th Floor Silver Spring, MD 20910 Use the station search engine to find the name of the plotted stations (select the "Call Sign" option on the search form before attempting a search). At 3.7m resolution, DigitalGlobe SWIR imagery provides 16 times the spatial information content compared to SWIR data available from ASTER and Landsat 8 satellites. Members of the news media may contact NESDIS by reaching out to our office of public affairs. Some infrared images are colored to resemble visible images (upper-left), while others include all the colors of the rainbow! C = K - 273. Fax: 301-713-1249. The key with any IR image is to locate the temperature-color scale (usually on the side or bottom of the image).

Take control of your data. Note the very dramatic changes in ground temperatures from night (light grey ground) to day (dark grey/black ground). Note the line of bright white clouds extending from the Outer Banks of North Carolina to central Florida (marked by point "A"). To demonstrate my point, check out  this loop of infrared images of the Sahara Desert. Subscribe for tropical weather

In other words, clouds with very cold tops are high-altitude cloud tops (for example: cirrostratus, cirrocumulus, cumulonimbus). Want another example? So, even though there is plenty of IR radiation coming from below the cloud and even from within the cloud itself, the only radiation that reaches the satellite is from the cloud top. Take this enhanced infrared image as an example. Visible imagery distinguishes between thick and thin clouds while infrared imagery distinguishes between high and low clouds. The Hurricane Watch Net, Amateur Radio Serving the National Hurricane Center and Mankind Since 1965. I am reminded by the old story of a group of blind men who are trying to describe an elephant. The College of Earth and Mineral Sciences is committed to making its websites accessible to all users, and welcomes comments or suggestions on access improvements. I should add the caveat that sometimes when clouds have very thin spots, infrared radiation from the earth's surface can leak through holes in the clouds and reach the satellite.

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