AccuWeather meteorologists warn travellers and those planning outdoor activities in the northeastern United States to be cautious through Sunday evening, as locally strong storms will pass through the region ahead of a slight drop in humidity levels on Monday.
The same system that sparked dozens of severe weather reports in the Midwest on Saturday, including several reports of tornadoes in Michigan, will pivot through the Northeast into Sunday night.
As humidity levels surge with the southeastward-moving feature, showers and thunderstorms will erupt and move along from the central Appalachians to parts of the mid-Atlantic and New England during the last part of the weekend.
“Even though the extent of severe thunderstorms may be rather low with this system as it rolls through the Northeast into Sunday evening, some communities can be hit hard with high winds, hail and flash flooding in the strongest storms,” AccuWeather Meteorologist Jake Sojda said.
The AccuWeather StormMax™ wind gust potential is rated at 80 mph in the strongest storms. At this level, minor property damage can occur along with falling trees and sporadic power outages.
Locally severe storms are expected to extend from southern Ohio and northern Kentucky to southeastern New York and western Connecticut. The threat zone includes the cities of Cincinnati, Charleston, West Virginia, Washington, D.C., Baltimore, Philadelphia, Scranton, and Harrisburg, Pennsylvania, Trenton, New Jersey, and New York City.
People who spend time outside or on the highways late at night should be aware of rapidly changing weather conditions. When you hear the first rumble of thunder, go inside because lightning can strike without warning. Drivers are cautioned not to drive through flooded roadways because the water may be rising much deeper than it appears and/or the road surface may have been washed away.
Following the weekend’s surge in moisture, the air behind this storm system is slightly less humid, and humidity levels are expected to fall slightly.
The air coming in on Monday and Tuesday, however, is significantly warmer than the air it replaces. As a result, temperatures are expected to rise 5-10 degrees Fahrenheit over the weekend. Monday and Tuesday highs along the Interstate-95 corridor are expected to range from the upper 80s around Boston to near 90 degrees in New York City and the lower to middle 90s in Philadelphia, Baltimore, Washington, D.C., and Richmond, according to the National Weather Service. Highs in the 80s will be common further inland.
Another storm system is expected to move southeastward across the region on Wednesday and Thursday. Showers and thunderstorms are expected to erupt on Wednesday as humidity levels rise again, combining with the storm system’s moisture and jet stream energy.
Another round of severe thunderstorms is possible from Wednesday around the Great Lakes to Thursday in the Northeast, ahead of a push of cooler, less humid air to finish the week.