A line of dark, fast-moving clouds brought strong thunderstorms to much of western and central Connecticut Monday afternoon, disrupting evening travel and cutting power to 2,700 homes.

Storms with winds of 40 to 60 mph began rolling across the state starting at about 4 p.m., according to the National Weather Service, which issued several severe storm warnings for Hartford, Fairfield, Litchfield, Tolland and New Haven counties.

The alerts, as well as several flood advisories, warned of hail the size of pennies and quarters, dangerous lightning and torrential rain that could lead to localized flash flooding.

Weather-related power outages were reported to about 1,800 Eversource customers — including more than 300 households each in Glastonbury and Manchester and 847 in East Haddam — and another 900 United Illuminating customers — including 745 households in New Haven.

The storms also downed trees and wires, temporarily blocking traffic on roads in Brookfield, Granby, Norwich, Redding and Salisbury, police said.

At Bradley International Airport in Windsor Locks — which saw about 1.4 inches of rainfall — the poor weather delayed 16 departures and 15 arrivals, spokeswoman Alisa Sisic said.

Tuesday brings clearer weather, with areas of fog before 8 a.m., and then a partly sunny forecast with a high near 85 degrees.