The National Weather Service is forecasting the potential for a significant severe weather on Tuesday June 23, including severe thunderstorms that may bring damaging winds (up to 70 mph), golf ball size hail, heavy rain, and a risk of isolated tornadoes. In addition, NWS Storm Prediction Center has categorized western and central Massachusetts to be at an Enhanced Risk for severe weather on Tuesday, and eastern and portions of southeastern Massachusetts to be at a Slight Risk for severe weather on Tuesday. Note that while not depicted on this map, Berkshire County in Western Massachusetts is also included in the “enhanced risk” (orange shading) for Severe Weather.

Graphic courtesy Mass. Emergency Management Agency

Graphic courtesy Mass. Emergency Management Agency

 

A great deal of uncertainty remains with this forecast; the severity of weather is highly dependent upon the instability of the air/atmosphere. If cloud cover remains throughout the morning and into early afternoon, the air is likely to remain more stable and the risk of storm severity will be decreased. If cloud cover clears by midday to early afternoon, the air will become more unstable and the risk of storm severity will be greatly increased.

Timing
• Late morning into early afternoon for Western MA
• 2:00 p.m. and 8:00 p.m. for central and Eastern/Southeastern MA

Potential Impacts
• Severe thunderstorms
• Damaging winds (up to 70 mph)
• Heavy rainfall that may result in localized and urban flooding
• Golf ball size hail
• Isolated tornadoes

 

Graphic courstesy Mass. Emergency Management Agency

Graphic courstesy Mass. Emergency Management Agency

 

How To Prepare
• Be prepared to take shelter immediately. Identify safe locations where you can take shelter tomorrow during a tornado or severe thunderstorm in your home, work, or wherever you may be. Consider basements or interior rooms on lowest level of your home or other buildings.
• Secure outdoor objects (patio furniture, children’s toys, trash cans and other items) that could be blown away or cause damage during strong winds.
• Keep an eye to the sky tomorrow after and check MEMA, media and National Weather Service for severe weather updates.
• Download Massachusetts Alerts smartphone alert app for weather alerts on your phone: www.mass.gov/mema/mobileapp.

See http://www.mass.gov/…/thunderstorms-lightning-and-severe-we… for more severe weather safety tips. Graphics via US National Weather Service Boston MA.