Storm Coordination Message #1 – Saturday 12/14/19 Heavy Rainfall/Strong to Damaging Wind Potential

Hello to all…

..Storm system bringing heavy rain and the potential for flooding between the heavy rainfall and rapid snowmelt in the region along with strong to damaging winds in Southeast New England and especially Cape Cod and the Islands..
..A Flood Watch is in effect through late Saturday Night for the entire NWS Boston/Norton Coverage area for 1.5 to 3″ of rain with isolated higher amounts of up to 3.5″. This rainfall coupled with snow melt in many areas and recent heavy rainfall has the potential to cause urban and poor drainage flooding as well as the potential for river flooding. It is also noted several rivers are under river flood watches as well and the statement detailing that is listed below..
..A High Wind Warning is in effect from 8 AM to 3 PM Saturday for Cape Cod and the Islands for sustained winds of 25-35 MPH and gusts between 50-60 MPH and isolated higher gusts possible. These winds can cause isolated to scattered pockets of tree and power line damage and power outages..
..A Wind Advisory is in effect through 2 PM Saturday for Plymouth and Southern Bristol Counties of Massachusetts and Bristol, Newport Counties and Block Island Rhode Island for sustained winds of 15-30 MPH with gusts to around 50 MPH. These winds will cause isolated pockets of tree and wire damage and isolated power outages..
..Additional wind headlines may be needed for later Saturday Night into Sunday and additional coordination messages will be posted to cover that potential..
..Very minor coastal flooding and splashover is possible during the midday high tide across East and South Coastal Massachusetts and South Coastal Rhode Island and a coastal flood statement has been issued to cover that potential..
..SKYWARN Self-Activation will monitor the storm system for measured rainfall, flooding and wind measurement and wind damage reports throughout the day Saturday. Self-Activation will also cover the potential for strong winds later Saturday Night into Sunday as well..

Storm system is in progress over the region with rainfall amounts already between 1 and 1.65″ noted across the region. Additional rainfall is expected and the heavy rainfall coupled with snow melt and prior heavy rain events earlier in the week could result in flooding of urban and poor drainage areas as well as small rivers and streams across the region. For that reason, a Flood Watch continues for the entire NWS Boston/Norton coverage area. Strong to damaging winds are expected in Southeast New England and especially Cape Cod and the Islands later this morning and early this afternoon as well. The headlines depict the current thinking. Key factors include:

1.) Ability for strong to damaging winds to mix down to the surface. Despite an inversion keeping some of the winds from reaching the surface, precipitation drag and any convective heavy showers or even a thunderstorm or two could bring those strong winds down to the surface.
2.) Amount of rainfall and snow melt that occurs will dictate how widespread any flooding will be and where the highest amounts of rainfall occur.

SKYWARN Self-Activation will monitor the storm system for measured rainfall, flooding and wind measurement and wind damage reports throughout the day Saturday. Self-Activation will also cover the potential for strong winds later Saturday Night into Sunday as well. This will be the only coordination message for this portion of the storm but additional coordination messages will be posted as needed for any additional wind headlines issued. Below is the NWS Boston/Norton Flood Watch Statement, River Flood Watch Statement, High Wind Warning/Wind Advisory Statement, Coastal Flood Statement, Hazardous Weather Outlook, Enhanced Hazardous Weather Outlook and Rainfall/Precipitation Forecast:

NWS Boston/Norton Flood Watch Statement:
https://kamala.cod.edu/ma/latest.wgus61.KBOX.html

NWS Boston/Norton River Flood Watch Statement:
https://kamala.cod.edu/offs/KBOX/1912140318.wgus61.html

NWS Boston/Norton High Wind Warning/Wind Advisory Statement:
https://kamala.cod.edu/ma/latest.wwus71.KBOX.html

NWS Boston/Norton Coastal Flood Statement:
https://kamala.cod.edu/ma/latest.whus41.KBOX.html

NWS Boston/Norton Hazardous Weather Outlook:
https://kamala.cod.edu/ma/latest.flus41.KBOX.html

NWS Boston/Norton Enhanced Hazardous Weather Outlook:
https://www.weather.gov/box/ehwo

NWS Boston/Norton Rainfall/Precipitation Forecast:
https://www.weather.gov/box/PQPFTest

Respectfully Submitted,

Robert Macedo (KD1CY)
ARES SKYWARN Coordinator
Eastern Massachusetts ARES Section Emergency Coordinator
Home Phone #: (508) 994-1875 (After 6 PM)
Home/Data #: (508) 997-4503 (After 6 PM)
Work Phone #: 508-346-2929 (8 AM-5 PM)
Email Address: rmacedo@rcn.com
http://ares.ema.arrl.org
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