The National Weather Service issued a flash flood warning for parts of northwestern and northern CT on Monday.Urban areas and areas with steep terrain will be most vulnerable to flash flooding, according to the Weather Service.The daytime high should be 83 degrees, according to the National Weather Service.Be prepared for the storms this afternoon to contain damaging winds and some hail.”We’ve got a pretty strong cold front that’s coming through”, said meteorologist James Brown at the weather service’s office in Gray. The Storm Prediction Center is still highlighting northwestern CT within the area of “enhanced risk” for strong storms. Some of those storms could be strong to severe with gusty winds and heavy rainfall, and small hail cannot be completely ruled out.Additional severe thunderstorm watches and warnings are likely to be issued later Monday as the storms draw closer. 3 to 4 inches of rain have already fallen in some areas between Benton and Murray. Any thunderstorms after the initial line of weather moves through in the evening are expected to be milder, Lessor said.The highest severe threat is over northeastern New Jersey and the Lower Hudson Valley, where possible tornadoes could form.A flash flood watch has been issued for Adams, Lancaster, Lebanon, and York Counties for this afternoon and evening. You should have a way to monitor the weather and warnings as they are issued.Overnight, the rain will continue as temperatures fall into the mid to upper 60s under mostly cloudy skies.