Fox News Weather Center

July-like heat to overtake much of eastern US toward end of April

Temperatures are poised to surge well into the 80s and 90s F over a large part of the eastern United States later next week through the last weekend of April.

It is possible that some areas will experience their first heat wave of the year. In the northern states, this is generally defined as three or more days in a row with a high of 90 degrees or greater.

The burst of summerlike weather will have warm season activities kicking into high gear.

Static East Warmup Next Week

In northern areas, fans and air conditioners that have not been needed so far this year may be put to use. It will get so warm that some people will be thinking about taking a dip in the pool, lake or ocean.

The jet stream is forecast to bulge northward, into part of eastern Canada, next week.

The jet stream, which guides weather systems along, is a fast river of air near where jets cruise at. South of the jet stream, the weather is often quite warm.

How far to the east the crest of the jet stream bulge occurs will determine how far east the core of the warm air sets up.

"The biggest temperature anomalies are likely to extend from the central and eastern Great Lakes and the Ohio Valley to the central Appalachians," according to AccuWeather Long-Range Meteorologist Evan Duffey.

Temperatures in some areas will run 15 to 25 degrees above average and will be more typical of the middle of July.

An exception to the heat may occur in coastal New England and perhaps farther south along the immediate mid-Atlantic coast. This would be due to a breeze off the ocean.

"Even if a strong sea breeze develops in part of the Interstate-95 corridor, temperatures will still be well above average in most of this area," Duffey said. "Ocean water temperatures are above average in the coastal Northeast."

Local breezes off the Great Lakes will also keep some shoreline areas relatively cool.

If the crest of the jet stream bulge sets up a couple of hundred miles farther east, then hot weather would approach the Atlantic coast. If the jet stream bulge sets up a couple of hundred miles farther west, then cooling effects from the ocean will penetrate well inland, perhaps to the Appalachians.

While more seasonable air is likely to progress eastward across the Midwest and South Central states during early May, warmth may linger from the Appalachians to the Atlantic coast well into the first week of May.

Backyard gardeners may be able to plant some warm season flowers and vegetables a little early this spring in the Northeast and Midwest as a result, provided they have a means to cover their crops during any chilly nights during the middle and latter part of May.

People considering a swim in northern areas should use caution. Lake, ocean and unheated pool water temperatures are still dangerously chilly this early in the season.

As heat builds in the East, chilly air will plunge into the Western states. In between, over the middle of the nation, severe weather is likely.

Static Severe Weather Setup late next week

Multiple rounds of damaging, life-threatening storms may erupt later next week and into next weekend.