Temperatures will rise from the mid-90s to near 100 in many places, while heat indices — a measure that factors in humidity — will soar from 100 to 105. Heat may not be historically significant, but records over multiple calendar days are possible and some monthly records are possible.
The National Weather Service said early-season heatwaves that persist for several days “will increase the risk of heatwaves beyond what ideal temperature values indicate.”
Many locations are forecast to reach the highest levels of the National Weather Service Heat hazard Forecasting, which assesses the risk to human health. Officials are urging people to stay hydrated, wear light clothing, and take breaks in the shade or indoors if they must be out in the heat for long periods of time.
Indianapolis, Detroit, Cleveland, Cincinnati, Buffalo, Pittsburgh, Philadelphia, DC and Baltimore are predicted to reach Level 4 heat risk at some point during the heat wave. This is the highest level, described as “rare and/or prolonged periods of extreme heat with little or no overnight relief.” Several other cites are forecast to reach Level 3, a level of heat that “would affect anyone without effective cooling and/or adequate hydration.”
The heat is rising in the northern parts of the Northeast, which rarely sees long periods of such extreme temperatures in June. The heat index hit 101 in Buffalo on Tuesday and is forecast to reach the mid to upper 90s on Wednesday and Thursday. In Rochester, NY, the heat index hit 103 on Tuesday and 104 on Wednesday.
Among affected cities, Pittsburgh endured the longest stretch of extreme heat, possibly rivaling the record expansion set in 1994. Syracuse, NY, Can create records Its longest days are 94 degrees or higher in June.
A high-pressure heat dome that causes dangerous heat Record levels of intensity can be achieved In some parts of the United States. Research shows that human-induced climate change is enhancing the strength, magnitude and frequency of such events.
Here’s a city-by-city forecast for warmer temperatures this week through the weekend.
After reaching 94 on Tuesday, just short of the calendar-day record of 97, highs in the mid to upper 90s are expected Wednesday and Thursday. Calendar-day records were 94 for Wednesday and 97 for Thursday. The heat index should be between 100 and 105 each day. Highs should be near 90 Friday and this weekend, then 80s to near 90 next week.
Heat peaks on both Wednesday and Thursday, with calendar day highs in the mid to upper 90s near calendar day highs of 96 on Wednesday and 98 on Thursday, with the heat index near or above 100 both days. Cool highs in the 80s are expected Friday through most of next week, and Saturday’s highs could be in the 70s.
After reaching highs in the mid-to-upper 90s Sunday through Tuesday, they should reach the mid-90s Wednesday, with the heat index in the upper 90s. Slightly cooler highs in the upper 80s to mid 90s are expected Thursday through most of next week. Daily highs on this calendar range from the 90s to the low 100s.
Highs in the mid to upper 90s are forecast through Sunday, with the heat index reaching 100 to 105. Calendar day record highs range from 97 to 99. “Overnight lows will only drop into the 70s, with no relief,” the weather service said. Slightly cooler highs in the upper 80s to mid 90s are expected Monday through most of next week.
Highs should reach the low 90s and low 90s through Sunday, with the heat index reaching the mid to upper 90s each day. Calendar-day record highs range from 92 to 96. Next week, high temperatures are expected in the 80s to near 90s.
Highs are forecast for Saturday in the mid to upper 90s, with heat index peaks of 95 to 100 each day. Calendar-day record highs range from 95 to 99. Cooler highs in the 80s will arrive by Sunday and continue through next week.
Temperatures start to climb near 90 on Wednesday and the heat index will reach the mid 90s. Highs will increase to the mid- to mid-90s Thursday and Friday, and Thursday and Friday could drop to a calendar-day record high of 97. The heat index should be in the upper 90s both days. Highs should cool off a bit into the upper 80s to 90 Saturday next week. Six consecutive days of temperatures hitting 90 degrees would be the first time the city has done so in June.
Temperatures will be in the low and mid 90s on Wednesday and Thursday. More extreme heat is forecast for Friday through Sunday, with daytime highs in the mid 90s near 100 and heat index peaks of 100 to 105 each day. Calendar-day record highs range from 97 to 100 during this period. Highs should be in the 90s or lows near 90 Monday through most of next week.
Highs should be in the mid-90s and near 100 Saturday, while the heat index should peak between 100 and 105. Calendar day record highs range from 95 to 98. Cooler temperatures will be in the low 80s to near 90 on Sunday and most of next week. The last time the city experienced heat of similar intensity and duration was 30 years ago, June 15-20, 1994, when the daytime high was 95 or higher. According to the weather service.
After reaching highs of 97 and 96 on Sunday and Monday, Tuesday cooled to a high in the 80s. Wednesday will warm back into the low 90s Thursday through Saturday before warming into the mid 90s to near 100. Calendar-day record highs range from 99 to 105. Highs will be in the mid to upper 90s through most of next week.
The worst heat is expected Friday through Sunday, with highs in the mid-90s near 100 and heat indexes reaching 100 to 105. Calendar day record highs range from 98 to 101. The city is likely to reach 100 for the first time since 2016. Overnight low doses in the 70s provide minimal relief.
Matthew Kapucci and Jason Samenow contributed to this report.
