This Hazardous Weather Outlook is for northwestern Connecticut,western Massachusetts, east central New York, and eastern New York . DAY ONE…Today and tonight. Locally heavy rainfall is expected tonight into early Tuesday morning. Some ponding of water on roadways and poor drainage flooding of urban and low lying areas may occur withing areas of heavier rainfall and isolated thunderstorms. An isolated flash flood is possible, especially if heavy downpours and thunderstorms repeatedly move across the same areas.