National Weather Service United States Department of Commerce

Storm Moving through the South; Pacific Storm to Impact the West this Weekend

A storm is expected to develop over the southern High Plains today and track to the Mid-Atlantic through Friday with showers and thunderstorms. On the northern edge, snow, ice, and/or a wintry mix is possible over the central Plains. A significant storm is expected to arrive late Friday through the weekend with rain, heavy mountain snow, and gusty winds for much of the West. Read More >

A multicell cluster of severe thunderstorms developed during the late afternoon hours of August 8th, 2005 in response to an interesting interaction of stormscale outflow boundaries and weak shortwave trough rotating out of northeast Illinois. This shortwave trough is easily seen in this Water Vapor animation...note the cyclonic circulation present over northeast Illinois which later moves into northwest Indiana.

Animation of visible satellite imagery showed the developing severe multicell cluster well especially with the upscale anvil growth and overshooting top which developed with the most severe storm in southern Elkhart county.

Conditions were quite favorable for surface based convection Monday afternoon as shown in the image which shows Convective Available Potential Energy (CAPE) and lifted index (LI) and surface observations across the area at 5 pm est August 8th, 2005.

This 0.5 degree radar reflectivity animation from the National Weather Service Doppler radar in North Webster shows the rapid development and intensification of the initial multicell storm cluster as it develops northwestward out of Allen county Indiana in the late afternoon. Note the vigorous storm development which occurs over southern Elkhart county late in the loop...this storm produced widespread large hail up to golfball size and which covered the ground in southern Goshen and rainfall amounts in excess of 3 inches in only one hour.

Additional storm reports can be found in this LOCAL STORM REPORT.



Page created by TH on Monday August 8, 2005 10:30 PM EST