[Weather] [2019.12.10 PM] NWS Boston EM Briefing: Accumulating Snow Hazards Late Tonight Into Wed

[BOX Operations - NOAA Service Account]

Good afternoon,

Following is an updated briefing on the expected changeover from rain to
accumulating snow expected to affect parts of southern New England late
tonight into the first part of Wednesday.

*Changes with this update:*

   - Minor adjustments to start time and storm total accumulations. *No
   changes to headlines.*

*What To Expect and When: *

   - Rain will change to snow from NW to SE late tonight into early
   Wednesday. The attached Onset graphic provides an approximate start time to
   the changeover to snow.
   - Steady light snows are expected to fall across most of southern New
   England into Wednesday, but steadier moderate-intensity snows are possible
   towards eastern CT, RI, SE Mass into Cape Cod by the Wednesday AM commute.
   - Snow is expected to decrease in intensity through noontime before
   ending across the South Coast by Wednesday early afternoon.

*Accumulations:*  A general inch to 4 inches, greatest amounts south/east.
While less likely, a reasonable worst-case snowfall accumulation is
attached. This gives a sense of what may happen if the axis of heaviest
snows shifts N/W and/or if narrow bands were to organize.

*Impacts: *

   - Wet pavement from recent rains may freeze before or during the period
   of snow, resulting in slick roads.
   - Snow may be enough to shovel and plow by Wednesday morning, especially
   areas S/E of I-95.
   - Difficult travel for the Wednesday morning commute.

*Forecast Confidence: *Moderate to high. The band of heaviest snow
accumulations may shift N/W toward a larger part of the I-95 corridor S of
Boston. Snow may organize into narrow bands that could result in heavier
snowfall rates; where these bands set up is not clear.

Attached graphics include the current Hazards in effect, an Onset graphic
which shows approximately when rain may change to snow, the updated
official storm total snow forecast, and a reasonable worst-case snow
accumulation forecast.

Meteorologist: Andrew Loconto

If you have any questions or would like more information, don't hesitate to
contact us via this email address, on NWSChat <https://nwschat.weather.gov/>,
or at the following:

National Weather Service Boston/Norton, MA
46 Commerce Way
Norton, MA 02766
508.622.3280
Website <http://www.weather.gov/boston> | Facebook
<http://www.facebook.com/NWSBoston> | Twitter
<http://www.twitter.com/NWSBoston>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.massupt.org/pipermail/weather/attachments/20191210/51676299/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SnowAmt90PrcntlISC_SFC.png
Type: image/png
Size: 124808 bytes
Desc: not available
URL: <http://lists.massupt.org/pipermail/weather/attachments/20191210/51676299/attachment-0004.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Onset_SFC.png
Type: image/png
Size: 139904 bytes
Desc: not available
URL: <http://lists.massupt.org/pipermail/weather/attachments/20191210/51676299/attachment-0005.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: StormTotalSnowISC_SFC.png
Type: image/png
Size: 124646 bytes
Desc: not available
URL: <http://lists.massupt.org/pipermail/weather/attachments/20191210/51676299/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Hazards.png
Type: image/png
Size: 85983 bytes
Desc: not available
URL: <http://lists.massupt.org/pipermail/weather/attachments/20191210/51676299/attachment-0007.png>