Latest Update From National Weather Service
We expect 1.5 to 2.5 inches of rain over much of southern New England, including southwest New Hampshire. Lesser amounts of around an inch appear likely along the Connecticut River Valley itself and across Cape Cod and the Islands. The area that appears most at risk for 2 to 2.5 inches includes a swath from northwest Rhode Island through east central Massachusetts and across most of the lower Merrimack River Basin. This rainfall may be more convective in nature, and thus we will need to keep an eye on rapid rises of small streams as well as urban poor drainage flooding – mainly tonight and Tuesday morning. Rhode Island: We have high confidence of the Pawtuxet River going into minor flooding. This could happen Tuesday afternoon or evening – depending upon more exact rainfall totals, intensity, and timing. The Blackstone River will rise again but at this time expected to remain below flood stage at Woonsocket.
Summary Heavy rainfall of 1 to 2.5 inches late today through Tuesday morning will cause a risk of small stream flooding across southern New England – especially southern New Hampshire, eastern and central Massachusetts and Rhode Island. Poor drainage urban flooding is likely to be an issue tonight and Tuesday morning. We will see main stem rivers respond to keep a few rivers in flood, bring a few more back into minor flooding, and still others into action stage but below flood stage. More rain than expected could cause more extensive and serious flooding.