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   satellite imagery

Image of the Day

The Operational Significant Event Imagery team produces high-resolution, detailed imagery of significant environmental events which are visible in remotely-sensed data available at the NOAA Science Center in Suitland, Maryland. This is the selected weather image of the day.

NEXRAD Radar

The NEXRAD Radar shows the current rainfall and is updated every 6 minutes. Clicking the image will open another window and automatically refreshes every 6 minutes.

Channel 1, visible (VIS)
The GOES visible wavelength channel produces images which can be thought of as black-and-white photographs of the earth and clouds from outer space. During the daylight hours, it is the most widely used channel because it has the highest resolution of all imaging channels.

Channel 2, short-wave infrared (IR)
Since the emissivity of water droplets at 3.9 µm is less than that for longer wavelengths, it is often easier to identify fog and stratiform cloudiness in the channel 2 imagery, and to discriminate between water and ice clouds. Many times fog can be identified on channel 2 imagery as cooler regions.

Channel 3, water vapor (WV)
Because organized atmospheric disturbances usually have large regions of upward (or downward) motion and consequent moistening (or drying), the water vapor data can often be used to locate and define synoptic features such as shortwave troughs, ridges, jet streams, etc.

Channel 4, long-wave/window IR
When we look at clouds, or the cloud-free ground, with this channel, we are "seeing" the actual temperature of the scene in the field-of-view. Channel 4 imagery has a wide variety of uses, including determination of cloud top heights, identification of cloud top features, tracking synoptic and mesoscale features at night, etc.

 

 


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