UPDATED: Massachusetts Under Tornado Watch Until 11 p.m.

For most of the day, much of the state has been under a severe thunderstorm watch for Tuesday afternoon into Tuesday night. Now the entire state is under a tornado watch until 11 p.m. tonight.

Forecasters say conditions are favorable for severe thunderstorms to spawn tornadoes.

Heavy downpours, winds with gusts up to 70 miles per hour and frequent lightning is expected with these storms, which are now prompting the tornado watch.

The National Weather Services says the severity of these storms will be dependent on the amount of heating (sunshine) that occurs after the first round of storms passes through.

The primary threats with the second round of storms are damaging winds with gusts up to 70 mph, frequent cloud to ground lightning, large hail (up to the size of golf balls), periods of localized flooding and a possible isolated tornado or two.

The highest risk for this round of severe weather is between 2 p.m. and 9 p.m. with the potential for impacts to the evening commute. The tornado warning extends until 11 p.m. Tuesday night.

Marlborough and much of Massachusetts is under a severe thunderstorm watch through Tuesday afternoon.

Want to know when the storms will be over Marlborough? Here’s a look at the hourly forecast, according to Weather.com:

2 p.m. - Mostly cloudy, 76 degrees
3 p.m. - Scattered thunderstorms, 82 degrees
4 p.m. - Scattered thunderstorms, 80 degrees
5 p.m. - Cloudy, 80 degrees
6 p.m. - Thunderstorms, 81 degrees
7 p.m. - Scattered thunderstorms, 77 degrees
8 p.m. - Scattered thunderstorms, 75 degrees
9 p.m. - Mostly cloudy, 73 degrees
10 p.m. - Mostly cloudy, 72 degrees
11 p.m. - Partly cloudy, 71 degrees

The main risk with any strong to severe thunderstorm will be isolated, damaging wind gusts and hail the size of quarters. Dangerous cloud to ground lightning and locally heavy rainfall may result in poor drainage street flooding.

Residents are reminded when you hear thunder you are close enough to get struck by lightning and should seek an inside shelter immediately.

View the extended Marlborough forecast >>>