Shelf Cloud over Green Bay and the Fox Valley

A thunderstorm with a photogenic shelf cloud (also known as an arcus cloud) moved across Waupaca and Outagamie counties into Brown county during the evening of June 13, 2004. 

A shelf cloud develops ahead of the thunderstorm as dense, rain cooled air cuts underneath the warm, moist air ahead of the storm.  Although its appearance is threatening, and almost always precedes gusty winds, the cloud is not necessarily a precursor to severe weather.
 

The Camera's View
(Click images for larger view)

Click for larger image. This photo was shot by Steven Gasper near New London (Waupaca Co.).

Click for larger image.

This image was captured by Greg Wagner in Greenville (Outagamie Co.).
Click for larger image. This photo was taken by Brian Severa in Little Chute (Outagamie Co.).
Click for larger image. This panoramic view was taken from the NWS Office in Green Bay by Jeff Last.


The Radar's View
(Click images for larger view)

Click for larger image. Base reflectivity (0.5 deg elevation) at 7:59 pm.  Note gust front at the leading (southeast) edge of storm.


This page was developed by Jeff Last (jeff.last@noaa.gov), Warning Coordination Meteorologist, NWS Green Bay.

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