An area of high pressure over the Eastern USA brought hot and very humid air to Southern New England on July 1st. Heat Index values of 105 to 109 occurred in parts of Eastern and Northwestern Massachusetts.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOX wrote it up.
An area of high pressure over the Eastern USA brought hot and very humid air to Southern New England on July 1st. Heat Index values of 105 to 109 occurred in parts of Eastern and Northwestern Massachusetts. Heat Index values in much of the state reached 95 to 104.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boston/Norton, MA wrote its last area forecast discussion before the first event at Jun 30, 6:29 PM EST, 16 hours 16 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 excessive heat. Local standard time, as filed.
The Automated Surface Observing System platform at Norwood Municipal Airport observed a heat index of 107 on July 1st from 11 AM to 3 PM EST.
The Automated Surface Observing System platform at Orange Municipal Airport observed a heat index of 107 on July 1st from 1 PM to 5 PM EST.
The Automated Surface Observing System platform at Lawrence Municipal Airport observed a heat index of 109 on July 1st from 1 PM to 3 PM EST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Massachusetts in 2018Every state in 2018This day in weather historyWarnings in Massachusetts, July 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 764412, 764410, 764411.