Update: Tornado Warning Issued for Winchester

The National Weather Service has issued a tornado warning for Winchester and other areas of Massachusetts effective until 5:45 p.m. today.

A tornado warning means a tornado may already be on the ground or is expected to develop shortly.

The National Weather Service suggests people to take cover and move to an interior room on the lowest floor of a sturdy building and avoid windows.

A tornado watch is still in effect until 8 p.m.

A tornado watch means weather conditions are favorable for tornadoes and severe thunderstorms in and near the watch area. Officials advise people in these areas to be on the lookout for “threatening weather conditions” and to listen for additional announcements and possible warnings during this time period.

The watch area stretches from about 10 miles southwest of Philadelphia to 35 miles northwest of Augusta, Maine and includes Middlesex county in Massachusetts, along with a few other counties across the commonwealth, and parts of Connecticut, New Hampshire, western Maine, New Jersey, southeast New York, southeast Pennsylvania and Rhode Island as well as nearby coastal waters.

Severe weather could include possible tornadoes, hail up to 2 inches in diameter, strong wind gusts of up to 70 miles per hour and dangerous lightning, according to the National Weather Service.

“A very unstable air mass has developed across this region,” the NWS said in a statement. “This combined with strong westerly flow aloft and increasing southerly low level winds will pose a risk of super cell storms capable of large hail, damaging winds and isolated tornadoes.”

If a tornado warning is issued—that is, a tornado has been sighted or indicated by radar—residents should take immediate precautions. The American Red Cross recommends that the safest place for residents to be in a tornado is in an underground shelter, basement or safe room.

"If no underground shelter or safe room is available, a small, windowless interior room or hallway on the lowest level of a sturdy building is the safest alternative," according to a Tornado Safety Checklist published by the Red Cross.

As of 1:30 p.m., officials said that all the prom activities and promenade that’s schedule to take place tonight is still on.