Possible Thunderstorms (Plus High Heat) Today

Good morning! I am in a time crunch this morning so this won’t be a long post at all.

The areas that were under a heat advisory yesterday are under one today as well, again until 7 PM. Highs will be a hair cooler, but still in the low to mid 90s with a few scattered upper 90s readings possible in the Merrimack Valley. Skies will be mostly sunny and winds will be SW at around 5-10 mph for much of today.

This combination of high heat and humidity will produce heat index values of 100-105, and heat exhaustion and heat stroke are possible for those who spend significant time outdoors tomorrow (especially if exerting physical work). If working outside, take frequent breaks and drink lots of water. If possible, stay in an air conditioned area, stay out of the sun, and check in on relatives and neighbors (particularly the elderly).

This graphic is on the National Weather Service’s national heat safety site, and it nicely describes the differences between heat exhaustion and heat stroke.


There will likely be some scattered thunderstorms this afternoon and early evening. Heavy rain and lightning are likely in any cell that develops, but an isolated to scattered severe storm may occur. Damaging winds will be the main threat, and while it is not likely, an isolated tornado cannot be ruled out. If a tornado does occur, it will probably be short-lived and weak (and more likely than not to be in NH or Maine).

When thunder roars, go indoors. And if a tornado warning is issued, take shelter in a basement or an interior room on the lowest floor of a sturdy building and avoid windows.

As I noted heavy rain has a solid shot of occurring in any cell, and there may be some street flooding in susceptible locations as such. Turn around, don’t drown when encountering flooded roads.

Some small hail is a low possibility and large hail is not expected at any point.


Published by Nathan Coram

Hello! I'm Nathan Coram, a 20 year old meteorology student and weather geek, and am in my junior year at UMass Lowell as a meteorology major. I am the current Vice President of the UML American Meteorological Society Local Student Chapter. Prior to at UML, I attended the Dracut school system for my K-12 years, having graduated from Dracut High in 2018. I first got into weather with the December 2008 ice storm, which knocked out my electricity for 4 days. I had no idea how it could be raining and becoming ice immediately, and how rain can knock out power. (Now I do - warm layer aloft, cold air at surface). But I didn't really get into it until the heat of July 2010 and specifically a few severe weather events during that month, followed by the year 2011, which featured several high profile weather events. Since then I have had a growing interest, and am hoping to make it into the meteorology field, preferably with NOAA/NWS. But for now, I'm blogging here on Dracut Weather (also on Twitter and Facebook), helping with the UML Weather Center social media, and tweeting about the weather on my own account as well. Thanks for visiting!

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