Check out these Boulder, Colorado images:

Fourmile Canyon Fire near Boulder, Colorado
Boulder, Colorado
Image by NASA Goddard Photo and Video
NASA image acquired Sept 6, 2010 at 18 :15 UTC

Fourmile Canyon Fire near Boulder, Colorado


Satellite: Terra

Credit: NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team

NASA Goddard Space Flight Center is home to the nation’s largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe.

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Lightning Cloud Burst Boulder County Colorado IM34
Boulder, Colorado
Image by Striking Photography by Bo Insogna
Colorful light reflections, Lightning Cloud Burst Boulder County Colorado IM34. Boulder County, Colorado cloud to cloud lightning thunderstorm cell April 25th,2011

Cloud-to-cloud lightning

Multiple paths of cloud-to-cloud Lightning discharges may occur between areas of cloud without contacting the ground. When it occurs between two separate clouds it is known as inter-cloud lightning and when it occurs between areas of differing electric potential within a single cloud, it is known as intra-cloud lightning. Intra-cloud lightning is the most frequently occurring type.[14]

These are most common between the upper anvil portion and lower reaches of a given thunderstorm. This lightning can sometimes be observed at great distances at night as so-called "heat lightning". In such instances, the observer may see only a flash of light without hearing any thunder. The "heat" portion of the term is a folk association between locally experienced warmth and the distant lightning flashes.

Another terminology used for cloud-cloud or cloud-cloud-ground lightning is "Anvil Crawler", due to the habit of the charge typically originating from beneath or within the anvil and scrambling through the upper cloud layers of a thunderstorm, normally generating multiple branch strokes which are dramatic to witness. These are usually seen as a thunderstorm passes over the observer or begins to decay. The most vivid crawler behavior occurs in well developed thunderstorms that feature extensive rear anvil shearing. Source: Wikipedia