When will the heatwave end? Here’s what you need to know about the forecast.

The heat wave that has been plaguing the eastern United States for several days continues this weekend into early next week, intensifying in some places while easing in others. Although the number of record temperatures could be lower and lower after this weekend, the long duration of heat in some places is among the many factors that worry authorities.

“Early onset of heat during the summer season, persistence of heat over several days, as well as light winds and limited cloud cover will be aggravating factors in terms of overall heat stress,” the National Weather Service said .

Heat will persist at peak intensity across the Ohio Valley and Midwest on Saturday before beginning to subside on Sunday. Intense heat will also burn the Mid-Atlantic Corridor and Interstate 95 from DC to New York through the weekend before slightly cooler weather arrives. The most intense heat moves south and west to the southeast, south-central and plains early next week.

In warmer locations, temperatures will reach the 90s and near 100 on several days, while heat indexes will climb to near or beyond 105 to 110. Nighttime temperatures will offer little relief. “Those without access to reliable air conditioning are advised to find a way to cool down as nighttime temperatures will be very warm,” the weather service added.

After a break in much of the country later next week, there are signs the heat could return by July.

The most intense heat this weekend

Much of the country, from eastern Kansas to near the mid-Atlantic coast and southern Michigan to Tennessee, faces a Level 3 or 4 heat hazard. These are the levels the highest in the weather service’s HeatRisk forecasts, which assess the danger to human health.

Indianapolis; Cincinnati; Columbus, Ohio; and Pittsburgh is expected to be among the hottest spots in the Midwest and Ohio Valley on Saturday, with highs expected in the mid to upper 90s and heat indexes reaching near 100, before cooling to highs closer to 90 on Sunday.

The highest heat risk levels retreat from the Midwest and Ohio Valley on Sunday, instead focusing on the Mid-Atlantic and Northeast, while extending southward into parts of the southeast and westward into Arkansas and Oklahoma.

Washington, Baltimore and Philadelphia expect temperatures in the upper 90s, near 100 Saturday and Sunday, with heat indexes climbing to near or beyond 105. Around New York and just outside The west, many places are expected to reach weekend highs in the mid-decade. 90s with heat indexes peaking in the upper 90s near 100.

Cities including DC; Harrisburg, Pennsylvania; Columbus; New York City; Philadelphia; and Norfolk could come close or set records this weekend. On Sunday, there could be more than 100 record-breaking warm lows from the southern Great Lakes to the East Coast.

Where the heat will be the strongest at the start of next week

The worst of the heat early next week will extend from Oklahoma eastward through Arkansas, northern Louisiana, Mississippi, Tennessee and parts of the Southeast. The scorching heat will also extend north to Missouri, southern Illinois and eastern Kansas.

In Oklahoma City, the heat will already rise this weekend, with highs reaching the mid-90s. Highs are expected to reach the upper 90s near 100 Monday through Wednesday as the heat index brings it closer or exceeds it by 100 from Saturday to Wednesday, and perhaps up to around 108 on Tuesday.

Another likely hot spot is Little Rock. Highs are forecast in the upper 90s, up to near 100 Sunday through Tuesday, and the heat index could reach near 105.

These cities, with Tulsa; Jackson, Mississippi; Nashville; Red Stick; and Atlanta, are all expected to reach a Level 4 thermal risk early next week. In Atlanta, temperatures are expected to reach the mid-90s each day Saturday through Wednesday, with heat indexes a few degrees higher.

Excessive heat is expected to extend north to St. Louis, which is looking at highs Monday and Tuesday in the upper 90s to a low of 100 and a heat index near or above 105.

The outlook for next week and beyond

More seasonal temperatures return to much of the eastern United States by the second half of next week, as heat builds up in parts of the West.

Parts of Idaho, Washington, Oregon, Montana, Wyoming, Utah and Nevada could see temperatures 15 to 20 degrees above normal. Unrelenting heat in Phoenix could push daytime highs near or beyond 110 each day through at least early July.

There are signs that the heat dome – a large area of ​​high pressure responsible for the heat – could expand eastward again around late June or early July. Forecasts from the National Oceanic and Atmospheric Administration favor above-normal temperatures for much of the country in July, particularly in the central and eastern United States.

NOAA reports that hot spots are likely to appear around the Four Corners region – the intersection of Colorado, Utah, New Mexico and Arizona, which is also expected to have precipitation below the normal – and along the east coast to New England. The Gulf Coast is also expected to experience warmer than average conditions, in part due to very warm waters around the Gulf of Mexico and Florida.

Jason Samenow, Ian Livingston and Kasha Patel contributed to this report.

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