The combination of intense heat, humidity and a frontal boundary will once again drive the development of some powerful thunderstorms into tonight.
Some of the same ingredients came together to form Friday night's deadly 'Super Derecho,' and storms over the weekend as well.
Fortunately, a derecho is a relatively rare event. However, complexes of thunderstorms, a few steps lower in intensity than a derecho, are more common. Although less intense, they can cause damage and threaten lives.
While anywhere from the northern Rockies to the Southeast, on the northern and eastern edge of the so-called 'ring of fire', could experience a brief, gusty thunderstorm, severe weather appears most probable in the Upper Midwest and in part of the Deep South.
These two areas will be close to potent atmospheric disturbances that could help turn more ordinary summertime thunderstorms into complexes of intense wind and rain.
Cloud cover, slightly lower humidity and/or prior storms have reduced the risk of violent thunderstorms over Carolinas and mid-Atlantic this evening. However, a stray, gusty thunderstorm cannot be ruled-out tonight.
Three people were killed when severe storms struck eastern North Carolina on Sunday. One man died when a barn collapsed, while a couple was fatally injured by a falling tree.
In both cases, strong thunderstorm wind gusts were likely to blame.
The greatest risk for violent storms in the South is near the boundary of the 100-degree heat, which lies in parts of Mississippi, Alabama, southern Georgia and northern Florida tonight.
A sudden powerful blast of wind, potentially stronger than 60 mph and frequent lightning strikes, will remain the primary threat from these thunderstorms.
The storm risk area will tend to migrate farther to the north and east during Tuesday.
Northern Plains/Upper Midwest
In addition to the risk of high winds and lightning strikes, the possibility of severe weather from the eastern Dakotas into Minnesota, Wisconsin and the Upper Peninsula of Michigan into tonight will include the threat for large hailstones.
Hail to the size of baseballs, enough to smash windshields and cause severe property damage, will be possible along with strong winds from the storms that erupt late today into early tonight.
Fargo, Aberdeen, Minneapolis-St. Paul, Duluth, Marquette and Green Bay are among the cities that could experience one of these strong storms into tonight.
Since the region at risk for experiencing severe weather is dotted with numerous lakes and ponds, countless people will be outdoors trying to catch a refreshing break from the heat.
If you plan to be one of these people, please be sure to stay alert of weather conditions and be prepared to seek shore at a moment's notice.
In addition to the possibility of widespread severe weather over the nation's northern tier, other storms will fire in a 'popcorn' fashion throughout the remainder of the Midwest and Great Lakes region.
Nature's Fireworks on July 4th
Unfortunately the threat for drenching and gusty thunderstorms will return each day for a large portion of the nation's eastern two-thirds as the hot, stormy pattern continues to stay locked in.
Thunderstorms will remain possible come time for Fourth of July fireworks from the Dakotas to the East and Gulf coasts, keeping spectators and organizers alike on edge.
Thunderstorms in the Northeast can be especially strong during Independence Day.
Yet another blast of Arctic air will roll southeastward this week over the Midwest and will reach the Northeast.
A new storm is poised to bring travel delays this weekend in parts of the Midwest, South and Northeast from snow, wintry mix and rain.
Another winter storm is on the way for the mid-Mississippi Valley, but areas affected by the recent ice storm will be spared.
With more snow in the forecast, we'll take a look at how to stay warm at outdoor winter events and the conditions it takes to create the intricate designs in snowflakes.
After some flurries Tuesday afternoon, temperatures will plummet midweek in Minneapolis.
Weather and temperatures will improve in Dallas helping to melt the ice throughout the city, as the week continues.
Madison, WI (1909)
14.8" snow, greatest single storm total for city (11th-13th).
San Francisco, CA (1932)
0.8" snow only 2nd occasion on which measurable snow fell in downtown San Francisco this century.
Raleigh, NC (1958)
9.1" of snow - December's biggest snowstorm.