National Weather Service United States Department of Commerce

Tracking Severe Thunderstorms and Excessive Rainfall in the Southern U.S.; Winter Storm to Impact the Northern U.S.

A storm system will shift from eastern Texas into the lower Mississippi Valley Monday with additional threats of severe thunderstorms and heavy to excessive rainfall which may bring flooding. A Flood Watch remains in effect. In the northern U.S., a storm will bring heavy snow and gusty winds over parts of the northern Rockies, northern Plains, and Upper Midwest Monday into Wednesday. Read More >


Explanation of EF-Scale Ratings

 Over the course of April 27th, 2011, damage across the entire range of the EF scale was sustained in some portion of the Huntsville County Warning Forecast Area. Below is a chart that explains what type of damage is associated with each ranking on the EF scale, including example photographs from the April 27th event.

EFScale Ratings