Severe Weather/Flash Flood Coordination Message #1 – Wednesday 9/12/23 Severe Weather/Flash Flood Potential

Hello to all…
..Thunderstorms with heavy downpours and flooding to flash flooding of urban/poor drainage areas, rivers and streams is a primary threat and an isolated strong to severe thunderstorm with strong to damaging winds as a secondary threat are expected late Wednesday Morning into early Thursday Morning with a trough and cold front poised to move through the area during Wednesday Afternoon and Evening. The Storm Prediction Center (SPC) has placed interior Massachusetts, Rhode Island and Connecticut in a marginal risk for severe weather for Wednesday..
..A Flood Watch is in effect from late Wednesday Morning through early Thursday Morning for the entire NWS Norton Coverage area except for Cape Cod and the Islands and the East slopes of the Berkshires for widespread rainfall of 1-2″ with areas or a band or two of 2-4″ of rain with isolated higher amounts leading to the potential for more flooding particularly in areas hit by the significant flash flooding Monday or the more isolated heavy rainfall this past weekend. Urban/poor drainage/river and stream flooding are all threats in the Flood Watch area..
..Hurricane Lee Coordination Messages will start some time Wednesday or Thursday Morning. Impacts remain unclear with model solutions providing different outcomes on what impacts and how much area of Southern New England could be impacted. People should continue to follow NWS/NHC updates on Hurricane Lee..
..SKYWARN Self-Activation will monitor for rain gauge, flood and any severe weather reports in the region late Wednesday Morning through Wednesday Night..

A historic flash flood affected portions of Southern New England. Pictures of flooding, flood damage from the hardest hit areas can be sent as reply to this message, via our Facebook/Twitter feeds or to the email address pics@nsradio.org with credit to the spotter unless otherwise indicated. See post storm message below for more info:
https://wx1box.org/2023/09/12/post-storm-coordination-message-1-monday-9-11-23-flash-flood-event/

Yet another frontal system will make its way to Southern New England Wednesday bringing the renewed threat for flooding as the primary threat with isolated severe weather as a secondary threat. The headlines depict the current thinking. Key factors include:
1.) Whether heaviest rain impacts areas hard hit on Monday.
2.) How widespread the heavy rain will be in the region
3.) The extent of any severe weather potential based on level of instability

SKYWARN Self-Activation will monitor for rain gauge, flood and any severe weather reports in the region. Another coordination message will be posted by 11 AM Wednesday Morning. Below is the NWS Boston/Norton Flood Watch Statement, Area Forecast Discussion and SPC Day-2 Convective Outlook:

NWS Boston/Norton Flood Watch Statement:
https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=FFA&format=CI&version=1&glossary=1&highlight=off

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

SPC Day-2 Convective Outlook:
https://www.spc.noaa.gov/products/outlook/archive/2023/day2otlk_20230912_1730.html

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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