The World's Current Weather is Depicted in the Live Global Map Below

Global Montage Overview

The global montage is a Mollweide projection composite image of cloud top, synoptic observation, and sea surface temperatures. The cloud image is a combination of GMS, GOES-8 and Meteosat imagery. A grid of temperatures, obtained from synoptic observations every six hours, is made into an image and merged with an image of Sea Surface Temperatures, generated daily from an NMC SST grid.

An algorithm was created to compare the surface temperature (SST over water or synoptic observation tempera- ture over land) with the infrared temperatures from the satellite imagery. Using this algorithm, the composite image uses the cloud values if an IR temperature is more than 14 degrees Kelvin colder than the surface temperature. This algorithm improved cloud/no-cloud classification by including marine stratus and filtering out clear areas that are very cold, such as polar regions.

These experimental images are for educational and general information purposes and are not meant for scientific, commercial, or other purposes.

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