Severe Weather Coordination Message #1 – Saturday Afternoon & Evening – 7/8/23 Flood & Severe Weather Potential

Hello to all…

..Thunderstorms with frequent lightning and heavy rainfall leading to urban and poor drainage flooding as a primary risk with a secondary risk for isolated strong to severe thunderstorms with strong to damaging winds and hail are possible across Southern New England particularly for Western and Central Massachusetts along and west of the I-495 corridor, Northern Connecticut, and Northwest Rhode Island for this Saturday Afternoon and Evening..
..Additional thunderstorms with heavy rainfall, potential flooding concerns and an isolated strong to severe thunderstorm risk will continue for the Sunday Afternoon through early Monday Evening period as well and this will be detailed in future coordination messages. This is a similar pattern to what occurred on Sunday 7/2-Tuesday 7/4 time period..
..SKYWARN Self-Activation will monitor the flooding and severe weather potential focusing on Saturday Afternoon and Evening to start and then Sunday into Monday time periods..

We are entering another active period of weather for Southern New England for the Saturday through Monday Evening timeframe. The headlines reflect current thinking with more details on the Sunday to Monday period to follow in future coordination messages. Key factors for today’s flooding and severe weather potential include:

1.) Thunderstorms and their ability to train over the same area and in areas that received heavier rainfall earlier this week will dictate the level of flooding concerns. This is especially true if the thunderstorms train over urbanized metro areas.
2.) Ability for instability to overcome low wind shear values for any stronger to isolated severe thunderstorms to form over the area and the potential for isolated wet microburst wind damage.

SKYWARN Self-Activation will monitor the flooding and severe weather potential focusing on Saturday Afternoon and Evening to start and then Sunday into Monday time periods. Another coordination message will be posted on the Sunday to Monday flooding and severe weather potential by 11 PM Saturday Evening. Below is the NWS Boston/Norton Area Forecast Discussion and Enhanced Hazardous Weather Outlook:

NWS Boston/Norton Area Forecast Discussion:
https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=AFD&format=CI&version=1&glossary=1&highlight=off

NWS Boston/Norton Enhanced Hazardous Weather Outlook:
https://www.weather.gov/erh/ghwo?wfo=box

Respectfully Submitted,

Robert Macedo (KD1CY)
ARES SKYWARN Coordinator
Eastern Massachusetts ARES Section Emergency Coordinator
Home Phone #: (508) 994-1875
Home/Data #: (508) 997-4503
Email Address: rmacedo@rcn.com
https://ares.ema.arrl.org
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