Good afternoon, We wanted to bring to your attention a couple of periods through Wednesday that we are watching for possible weather-related impacts. *Late Monday into Monday Night: Rain (Heavy at Times)* A period of heavy rain is forecast for later Monday into Monday night. Rain amounts between about an inch to up to 2 inches, wettest mainly south of Interstate 90. As temperatures will be unseasonably mild into the 50s on Monday and upper 40s to near 50 on Monday night, existing snowpack across northern CT into MA will be melting. The combination of rain and snowmelt should result in within-bank rises on area rivers and streams. Minor urban and poor drainage nuisance flooding is possible especially where storm drains are clogged. Areas of standing water from rain and/or snowmelt for the Monday evening commute could result in hydroplaning. *Confidence:* High. Heaviest rains are expected south of where snowpack is greatest, and it would take even heavier rainfall further to the north to produce a greater flood threat. *Tuesday Night into Wednesday*: *Accumulating Snow* Rain will change over to a period of accumulating snows overnight into the first part of Wednesday. Snow is expected to end by Wednesday afternoon. The potential exists for plowable snowfall across interior MA (to I-95) and northern parts of CT and RI Tuesday night into the first part of Wednesday. As temperatures fall, wet pavement from rains Monday into early Tuesday may freeze and become slick before or during the period of accumulating snow. This may result in difficult travel into the Wednesday morning commute. *Confidence: *Moderate to high on impact potential, though moderate on snow accumulations & changeover time. The axis of heaviest snowfall remains in question, which could alter snowfall totals (up or down) on the northwestern or southeastern end. The potential for snowfall rates at or over 1"/hr is uncertain. Changeover timing is approximate and will depend on how quickly colder air advances southeast. Following graphics are rainfall accumulations through Tuesday morning, a first look at snow accumulations and an approximate rain-to-snow changeover onset time for Tuesday Night and Wednesday. **Note:* Please consider the snow accumulation and onset time graphics as *preliminary* and are subject to further adjustments. Meteorologists: Andrew Loconto and Frank Nocera If you have any questions or would like more information, don't hesitate to contact us via this email address, on NWSChat <https://nwschat.weather.gov/>, or at the following: National Weather Service Boston/Norton, MA 46 Commerce Way Norton, MA 02766 508.622.3280 Website <http://www.weather.gov/boston> | Facebook <http://www.facebook.com/NWSBoston> | Twitter <http://www.twitter.com/NWSBoston>
