[Weather] [2020-04-17 PM] Correction - NWS Boston EM Briefing: Snow tonight into Saturday morning

[BOX Operations - NOAA Service Account]

*... The probability graphics for 4+" and 6+" have been corrected...*

Good afternoon,

Here is the latest on the snow storm that is expected tonight into Saturday
morning across much of interior Southern New England and into eastern MA.

*Changes with this update:*

   - *Winter Storm Warning now in effect for **western Franklin, western
   Hampshire, western Franklin, and all of Worcester County (7 PM tonight to
   Noon Sat.) *
   - *Winter Weather Advisory expanded southeastward to include Bristol and
   Plymouth Counties in southeast MA, except along the immediate south coast
   and all of Providence County in RI (**7 PM tonight to Noon Sat.)*

*Details:*

*What and Where:*  We are expecting light rain to develop across western MA
toward evening, then spreading eastward and mixing with and changing to
snow.  The snow may become heavy at times for a few hours, with 1 to 2 inch
per hour rates and low visibility spreading eastward between 11 PM and 5
AM.  Although road surfaces may be relatively warm to start, the heavy
rates will cause rapid accumulation on roadways.  The snow will mainly fall
north of a line from Hartford to Providence to Plymouth.  South of that
area, mainly rain is expected.  The snow will taper to flurries and light
rain showers by mid morning Saturday.

Expected snow accumulations:

   - In Massachusetts... 4"-8" in the east slopes of the Berkshires and in
   Worcester County; 3"-4" west and south of the Boston metro area; 1"-3" in
   the immediate Springfield metro area and from Boston northward to Cape Ann;
   1" or less south coast and Cape Cod.
   - In Connecticut... 3"-6" in the higher terrain of northwest Hartford
   County and northeast Tolland and Windham Counties near the MA border; 0-2"
   in southern Hartford, southern Tolland, and southern Windham Counties,
   including the immediate Hartford metro area.
   - In Rhode Island... 2"-5" in northernmost Providence County; 1-3" in
   central RI, and 0 to 1" in the southern third of RI.

*When:*  Rain changes over to snow from west to east after 8 PM.  Snow
becomes heavy at times overnight and becomes light and mixes back with rain
Saturday morning. Period of greatest impact is overnight tonight due to
heavy wet snow reducing visibility and clinging to power lines.

*Impacts:*

   - Heavy/wet snow may lead to power outages and tree/limb damage [where
   more than 4 inches of snowfall occurs]. Greatest potential for this
   includes the east slopes of the Berkshires and northern Worcester County.
   - Slushy/icy untreated surfaces and secondary roads.

*Confidence:  *This is now a moderately high confidence forecast.  The
biggest question is how far southeastward into southeast MA the appreciable
snowfall will be.

The attached graphics show:  Watches/Warnings; Expected Snowfall Totals;
Probabilities of Greater that 4" and 6" of snow.

Meteorologists: Kevin Cadima and Glenn Field

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>
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