When is NJ heat wave coming? Extreme heat watch in effect: See heat index forecast, more
A dangerous heat wave is set to hit New Jersey behind a pleasant first day of summer, bringing a "heat dome" that will cause heat index values to soar past 100 degrees, according to the National Weather Service.
An extreme heat watch is in effect for multiple New Jersey counties, with several other northeast New Jersey counties under a hazardous weather outlook as a large "bubble of heat" slowly drifts across the U.S. Here's the latest heat wave forecast, from timing, heat index charts and more.
The first heat wave of the year to set to hit New Jersey by the end of the weekend and is expected to peak early next week, with the potential to expand into Thursday, June 26.
Temperatures will warm into the upper 80s to near 90 on Saturday, June 21, but significant heat will ramp up on Sunday, June 22, as the heat index soars, which combines relative humidity and temperature to create a "feels like" temperature. Actual temperatures are expected to reach the low to upper 90s, and near 100 inland on Sunday, with inland areas easily surpassing 100 degrees by Monday, while coastal areas will near the 100-degree mark.
Forecasters say this heat wave will feel significant due to several factors: Most of June has had below average temperatures, there will be a lack of relief at night and the heat wave's lengthy duration.
Heat index values — remember what it "feels like" — are expected to be at or exceed 105 degrees Monday, June 23, through Wednesday, June 25 in New Jersey, NOAA said in a briefing on Friday, June 20. It may feel closer to 110 degrees in many areas of the state, according to NOAA's Weather Prediction Center.
An extreme heat watch is in effect from 8 a.m. Monday, June 23 through 8 p.m. Wednesday, June 25 for the following NJ counties: Burlington (northwestern area), Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, and Warren counties.
Heat index values are expected to top 106 degrees, the NWS said. In these counties, an extreme heat watch is issued when conditions are favorable for heat index values of 105 or greater for two consecutive hours.
A hazardous weather outlook is in effect for Bergen, Essex, Hudson, Passaic and Union counties for Sunday, June 22 through Wednesday, June 25. Heat index values have the potential to reach 105 degrees early next week, NWS said. Hazardous weather outlooks are issued before an advisory, watch or warning.
To determine the heat index while in a shady location, use the chart below. If you are exposed to direct sunlight, NOAA explains the heat index value can be increased by up to 15 degrees. Prefer to input your own numbers manually? NOAA has a heat index calculator that can be accessed here.
A heat wave is a period of abnormally hot weather when temperatures are well above average than usual for that area and time of year, according to the National Weather Service.
Heat waves can vary in length and intensity, and cause harm to the human body but also to transportation, water, the electric lines, agriculture and more. To be classified a heat wave, the high temperatures must last at least two days.
A heat dome occurs when a persistent region of high-pressure traps heat over an area, causing it to sink toward the surface, according to NOAA. The sinking air acts as a dome capping the atmosphere, trapping the heat and leaving very little chance for rain.
Lori Comstock is a New Jersey-based journalist with the Mid-Atlantic Connect Team.
This article originally appeared on NorthJersey.com: NJ heat index to soar as extreme heat watch issued: See forecast
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