Alert archive / Rhode Island / Snow Squall Warnings in 2019

Snow Squall Warning 10, NWS Boston/Norton, MA

December 18, 2019Northeastern Connecticut Planning Region, Connecticut; Kent County, Providence County, Rhode Island

NWS Boston/Norton, MA issued this snow squall warning at Dec 18, 2019, 4:07 PM EST for Northeastern Connecticut Planning Region, Connecticut; Kent County, Providence County, Rhode Island. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Dec 18, 2019, 4:07 PM EST (21:07 UTC)
Expired
Dec 18, 2019, 4:45 PM EST
In force
38 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Northeastern Connecticut Planning Region, CT, Kent County, RI, Providence County, RI

The radar

The Boston radar (KBOX), 65 km from the middle of the area, began a volume at 21:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 hours before the alert went out and 136 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2019-12-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2019-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -352 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
868 m above ground
0-6 km bulk shear
119 kt
0-1 km storm-relative helicity
-352 m²/s²
0-3 km storm-relative helicity
-46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

991 
WWUS51 KBOX 182109
SQWBOX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Boston/Norton MA
407 PM EST Wed Dec 18 2019

CTC015-RIC003-007-182145-
/O.NEW.KBOX.SQ.W.0010.191218T2107Z-191218T2145Z/
Windham CT-Kent RI-Providence RI-
407 PM EST Wed Dec 18 2019

The National Weather Service in Boston/Norton has issued a

* Snow Squall Warning for...
  Northeastern Windham County in northern Connecticut...
  West central Kent County in Rhode Island...
  Southwestern Providence County in Rhode Island...

* Until 445 PM EST.

* At 407 PM EST, a dangerous snow squall was located near Pomfret, or
  13 miles northeast of Mansfield, moving east at 20 mph.

  HAZARD...Extremely poor visibility in heavy snow.

  SOURCE...Radar indicated.

  IMPACT...Dangerous life-threatening travel.

* Squall is approaching I-395 and may impact Route 44 and Route 6.

Locations impacted include...
Coventry, Plainfield, Smithfield, Killingly, Burrillville, Scituate,
Glocester, Putnam, Thompson, Brooklyn, Woodstock, Foster, Ashford,
Pomfret, Sterling, Hampton and Eastford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

&&

LAT...LON 4185 7215 4202 7207 4193 7154 4167 7166
TIME...MOT...LOC 2107Z 288DEG 19KT 4191 7202 

$$

Belk
1 follow-up statement
125 
WWUS51 KBOX 182137
SQWBOX

Snow Squall Warning
National Weather Service Boston/Norton MA
435 PM EST Wed Dec 18 2019

CTC015-RIC003-007-182145-
/O.CON.KBOX.SQ.W.0010.000000T0000Z-191218T2145Z/
Windham CT-Kent RI-Providence RI-
435 PM EST Wed Dec 18 2019

...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 445 PM EST FOR
NORTHEASTERN WINDHAM...WEST CENTRAL KENT AND SOUTHWESTERN PROVIDENCE
COUNTIES...

At 435 PM EST, a dangerous snow squall was located over Killingly, or
12 miles north of Plainfield, moving east at 25 mph.

HAZARD...Poor visibility from heavy snow.

SOURCE...Radar indicated.

IMPACT...Dangerous life-threatening travel.

This snow squall was weakening as it moved into western Rhode 
Island. Poor visibility with quick accumulation is expected for 
portions of Route 6 and Route 44.

Locations impacted include...
Coventry, Plainfield, Smithfield, Killingly, Burrillville, Scituate,
Glocester, Putnam, Thompson, Brooklyn, Woodstock, Foster, Ashford,
Pomfret, Sterling, Hampton and Eastford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

&&

LAT...LON 4185 7215 4202 7207 4193 7154 4167 7166
TIME...MOT...LOC 2135Z 286DEG 20KT 4186 7182 

$$

Belk

What forecasters said that day

The local office's own words before this snow squall warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this snow squall warning went out at Dec 18, 12:48 PM EST, 3 hours 19 minutes earlier.

Area forecast discussion, Dec 18, 12:48 PM EST, 3 hours 19 minutes before
Area Forecast Discussion
National Weather Service Boston/Norton MA
1248 PM EST Wed Dec 18 2019

.SYNOPSIS...
An inverted trough will lift north and east of the region this
morning as low pressure exits. Any precipitation will come to an
end by mid morning from west to east. A cold front through
during the afternoon and into the evening. This will bring
scattered snow squalls and will be accompanied by strong wind
gusts. Arctic air will push in wake of the front. This coupled
with the winds will bring very low wind chill values. Dry and
cold conditions continue Thursday and Friday. Dry weather likely
lingers through the weekend into early next week and will be
accompanied by moderating temperatures.

&&

.NEAR TERM /THROUGH TONIGHT/...
1015 AM Update:

Ridge remains in place across western New England and will lead
to mostly sunny skies for the first part of the day, with
temperatures warming into the upper 20s to mid 30s.

Of greater interest weather-wise though is the Arctic cold
front which per surface analysis and METARs was just about to
cross the NY/Ontario international border. Lake-enhanced
moisture is currently contributing to periods of snow showers
across central and western NY. SPC mesoanalysis indicates snow
squall parameter values greater than 1 unit (which highlights
favorable areas of convective instability, moisture and wind
conditions for snow squall production) across NY now, and models
show this shifting eastward during the mid-afternoon to early
evening. Does appear that the most coherent signal for snow
squalls is more into western NY into VT and NH where low-level
frontogenesis appears greater, but did note the HRRR and NAM-
3km simuluated reflectivity brings a cluster of snow
showers/squalls through western MA/CT Valley by mid-afternoon
and progresses this eastward across the rest of MA, northeast CT
into northern RI by late afternoon into early evening. While
snow squalls are short- lived features (less than an hour), they
do cause reduced visibility, a quick coating to an inch of
snow, with temporary whiteout conditions. As this appears more
likely to affect today's PM commute, opted to issue a proactive
SPS in collaboration with neighboring WFOs.

Previous Discussion...

Highlights...

Slick AM commute especially where roads are untreated and black
ice has formed.

Rain and snow ending across the coastal plain and RI.

Scattered snow showers begin spreading into western MA by noon.

Details...

An inverted trough will lift north and east of the region
as low pressure exits. This will gradually bring an end to
precipitation across eastern MA and RI. Temperatures will be at or
below freezing for much of the CWA this morning. Any areas where the
pavement is wet and untreated could be slick as black ice may form.

A weak mid level ridge will quickly build in this morning and bring
partly to mostly sunny skies. This will be short lived as a cold
front slides in from the northwest, which will increase cloud cover
from northwest to southeast heading into the afternoon. Snow shower
chances will increase across the Berkshires. Temperatures will
increase into the low to mid 30s by noon with the coldest readings
across the CT River Valley.

&&

.SHORT TERM /THURSDAY/...
Highlights...

Scattered snow showers and snow squalls this afternoon into this
evening. This activity could impact the evening commute.

Arctic air pushes in tonight bringing gusty winds and producing wind
chills between 0 degrees and nearly 20 degrees below zero late
tonight into early Thursday AM. The coldest readings are expected
where a Wind Chill Advisory has been issued across the Berkshires. A
Wind Advisory has been issued for Cape Cod and the Islands due to
the strong winds.

Details...

This afternoon and tonight...

Cyclonic flow across the eastern Great Lakes and New England with a
cutoff situated over the central Great Lakes. This feature will lift
into northern New England by this evening. At the surface a cold
front will slide through. The combination of daytime heating, low
level moisture and the cold front sliding in will result in
scattered snow showers. The latest NAM, GFS, ARW and NMM show nearly
adiabatic lapse rates within the lowest 2 km along with strong low
level convergence and around 50 to 90 J/kg of CAPE. Looks like an
environment with potential for snow squalls, but the best
opportunity is across northern New England due to the proximity to
the upper low. Think that there will be a period from roughly noon
until 9 PM where there will be widely scattered snow showers. Looks
like the best opportunity for snow squall activity will be across
the Berkshires, CT Valley and Worcester Hills. However, cannot rule
out this activity spreading further east. Have some concern that
this activity lingers and impacts the evening commute. Expect
anywhere from a dusting to an inch of accumulation where snow
showers pass through.

Any snow shower activity will quickly diminish this evening due to
the loss of heating. Still expect strong mechanical mixing as Arctic
air filters in. Expect westerly winds becoming northwesterly with
speeds of 15 to 25 mph and inland and gusts of 20 to 30 mph. Expect
stronger mixing across the Cape and Islands where gusts of 40 mph
are expected overnight. Strong agreement amongst guidance and per
NAM/GFS Bufkit profiles for strong gusts across the Cape and
Islands. Decided to issue a Wind Advisory into Thursday morning. The
gusty winds inland coupled with the plummeting temperatures
will result in very cold wind chills. Values of 0 to 20 degrees
below zero can be expected late tonight into early Thursday
morning with the coldest readings where the Wind Chill Advisory
has been issued. Low temperatures will fall into the single
digits and teens above zero across the region.

Thursday...

Cyclonic flow persists aloft, however the cutoff will lift northeast
of the region. A mid level ridge will build in from the west. This
will gradually relax the pressure gradient and bring lighter gusts
over land. Skies will be partly to mostly sunny, but it will be
chilly with the arctic air in place. High temperatures range from
the teens across the higher elevations inland to the low to mid 20s
across the coastal plain.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
Highlights...

* Arctic High high pressure brings dry weather Thu - Tuesday

* Temps well below normal Friday will moderate through the weekend
  into next week

Details...

Thursday night and Friday...

A sprawling high pressure moves into place at the surface with cold
NW flow aloft keeping the Arctic airmass over the region. The
surface pressure gradient ahead of the advancing high remains
tight which will keep winds gusty Thursday night helping to
limit decoupling and radiative cooling. Friday winds come down
through the morning as the center of the high moves east. Dry
weather expected with plenty of sun. Sunny skies may be
deceiving, however, as temperatures will feel frigid, only
topping out in the 20s Friday. This would be 10 to 10F below
normal for late December.

Saturday through Tuesday...

The quiet weather stretch continues through at least Tuesday under
continued high pressure. An upper level shortwave over the desert SW
becomes closed off and separated from the steering flow
Saturday and a dip in the northern stream moves through to our
north late Saturday, but at the moment its looking like we may
get some added cloud cover and not much else. That larger
system stays well to our south Sun/Mon while another disturbance
passes well to our north. For now it continues to look like
we'll thread the needle between systems and stay dry. By late
Saturday winds come out of the SW and W which brings in warmer
air and moderating temps back toward normal. Highs by Saturday
are back in the 30s; 30s/40s by Sunday into next week.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Short Term /through Thursday/...

18z TAF Update:

Today...High confidence.

Still some straggling MVFR ceilings s towards FMH- HYA but
expecting improvement to VFR shortly. Arctic front will then be
the main focus, which still looks to bring about a period of
scattered snow showers and localized snow squalls moving into
the PM push. Expect a 30-min period of IFR to VLIFR visby in
snow showers and brief gusty winds to 25 kts. Still think the
greatest potential for sub- IFR visby squalls is N/W of Boston-
Providence, but may make it as far as these airports. W winds
around 10 kts today, becoming NW late in the western terminals.

Tonight...VFR. Biggest concern is the NW wind gusts, with winds
15-25 kts gusts 35-40 kts, strongest at BOS and on the Cape.

Thursday...VFR. Strong NW winds with local gusts up to 30 kt.

KBOS Terminal...High confidence in TAF trends, moderate on snow
squall potential. Scattered snow showers, possible snow squalls
21-23z. Best chance N/W of Logan, but may need to TEMPO in snow
squalls with future amendments.

KBDL Terminal...High confidence in TAF trends, moderate on
timing. May see periods of snow showers early this afternoon,
but lowest visby snow showers/squalls mainly ~20-22z.

Outlook /Thursday Night through Sunday/...

Thursday Night: VFR. Windy with local gusts up to 30 kt.

Friday: VFR. Breezy.

Friday Night through Sunday: VFR.

&&

.MARINE...
Short Term /through Thursday/...

Seas will continue to run above SCA levels on the outer waters
into Wednesday, and will build further as a strong Arctic front
moves across the waters late today and tonight. Gale warnings
have been issued for all waters with gusts in the 35-40 kt
range starting this evening. These conditions will persist into
Thursday. With the colder air moving in and cooler ocean
temperatures expect freezing spray across the eastern nearshore
waters. A Freezing Spray Advisory has been issued tonight into
Thursday morning.

Outlook /Thursday Night through Sunday/...

Thursday Night: Moderate risk for Small Craft Advisory winds
with gusts up to 30 kt. Rough seas up to 10 ft.

Friday: Winds less than 25 kt. Local rough seas.

Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft.

Saturday through Sunday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...Wind Advisory from 6 PM this evening to 10 AM EST Thursday for
     MAZ022>024.
     Wind Chill Advisory from midnight tonight to 10 AM EST
     Thursday for MAZ002-008-009.
RI...Wind Advisory from 6 PM this evening to 7 AM EST Thursday for
     RIZ008.
MARINE...Freezing Spray Advisory from 1 AM to 10 AM EST Thursday for
     ANZ231-232-251.
     Gale Warning from 6 PM this evening to noon EST Thursday for
     ANZ231>235-237-251-255-256.
     Gale Warning from 6 PM this evening to 7 AM EST Thursday for
     ANZ230-236.
     Gale Warning from 6 PM this evening to 10 PM EST Thursday for
     ANZ250-254.

&&

SYNOPSIS...BL
NEAR TERM...KJC/BL/Loconto/BW
SHORT TERM...KJC/BL
LONG TERM...BW
AVIATION...BL/Loconto/BW
MARINE...KJC/BL/Loconto/BW
Hazardous weather outlook, Dec 18, 4:04 AM EST, 12 hours 3 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
404 AM EST Wed Dec 18 2019

CTZ002>004-MAZ003>007-010>021-026-RIZ001>007-190915-
Hartford CT-Tolland CT-Windham CT-Eastern Franklin MA-
Northern Worcester MA-Central Middlesex MA-Western Essex MA-
Eastern Essex MA-Eastern Hampshire MA-Eastern Hampden MA-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-
Southern Plymouth MA-Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-
404 AM EST Wed Dec 18 2019

This Hazardous Weather Outlook is for northern Connecticut, central
Massachusetts, eastern Massachusetts, northeastern Massachusetts,
southeastern Massachusetts, western Massachusetts, northern Rhode
Island and southern Rhode Island.

.DAY ONE...Today and tonight.

Scattered snow squalls are possible this afternoon and evening which
could briefly drop visibility to near zero with heavy snow and gusty
winds.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ002-008-009-190915-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
404 AM EST Wed Dec 18 2019

...WIND CHILL ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM EST
THURSDAY...

This Hazardous Weather Outlook is for western Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Chill Advisory.

Scattered snow squalls are possible this afternoon and evening which
could briefly drop visibility to near zero with heavy snow and gusty
winds.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Chill Advisory.

Wind Advisories may be needed for a time Wednesday night into
Thursday. Wind Chill Advisories may be needed Wednesday night in
the east slopes of the Berkshires.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

MAZ022>024-190915-
Barnstable MA-Dukes MA-Nantucket MA-
404 AM EST Wed Dec 18 2019

...WIND ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 10 AM EST
THURSDAY...

This Hazardous Weather Outlook is for southeastern Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Advisory.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Advisory.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

RIZ008-190915-
Block Island RI-
404 AM EST Wed Dec 18 2019

...WIND ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 7 AM EST
THURSDAY...

This Hazardous Weather Outlook is for southern Rhode Island.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Advisory.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Wind Advisory.

Brief period snow and sleet late tonight into early Tuesday morning
before turning over to all rain.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

ANZ233>235-237-255-256-190915-
Vineyard Sound-Buzzards Bay-Rhode Island Sound-Block Island Sound-
Coastal Waters extending out to 25 nm South of Marthas Vineyard and
Nantucket-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
404 AM EST Wed Dec 18 2019

...GALE WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON EST
THURSDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ250-254-190915-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
404 AM EST Wed Dec 18 2019

...GALE WARNING IN EFFECT FROM 6 PM THIS EVENING TO 10 PM EST
THURSDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ231-232-251-190915-
Cape Cod Bay-Nantucket Sound-Massachusetts Bay and Ipswich Bay-
404 AM EST Wed Dec 18 2019

...GALE WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON EST
THURSDAY...
...FREEZING SPRAY ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST
THURSDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.
   Freezing Spray Advisory.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.
   Freezing Spray Advisory.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230-236-190915-
Boston Harbor-Narragansett Bay-
404 AM EST Wed Dec 18 2019

...GALE WARNING IN EFFECT FROM 6 PM THIS EVENING TO 7 AM EST
THURSDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/us.nationalweatherservice.boston.gov

You can follow us on Twitter at
@NWSBoston

In the hours before

Special weather statement, Dec 18, 10:07 AM EST, 6 hours before
Special Weather Statement
National Weather Service Boston/Norton MA
1007 AM EST Wed Dec 18 2019

CTZ002>004-MAZ002>018-026-RIZ001>005-181800-
Hartford CT-Tolland CT-Windham CT-Western Franklin MA-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Eastern Essex MA-Western Hampshire MA-
Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Bristol MA-
Western Plymouth MA-Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
Bristol RI-
Including the cities of Hartford, Windsor Locks, Union, Vernon,
Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre,
Fitchburg, Framingham, Lowell, Lawrence, Gloucester,
Chesterfield, Blandford, Amherst, Northampton, Springfield,
Milford, Worcester, Foxborough, Norwood, Cambridge, Boston,
Quincy, Taunton, Brockton, Ayer, Foster, Smithfield, Providence,
Coventry, West Greenwich, East Greenwich, Warwick, West Warwick,
and Bristol
1007 AM EST Wed Dec 18 2019

...SCATTERED SNOW SQUALLS WITH BRIEF REDUCED VISIBILITIES
POSSIBLE LATER TODAY...

Snow squalls are possible between today as an Arctic cold front
moves across Southern New England. Snow squalls should move into
western MA into the CT Valley between 2 and 5 PM, and central into
eastern MA, northern RI and northeast CT between 4 and 8 PM.

Snow squalls are bursts of intense snow showers, often lasting
between 30 minutes to an hour, but produce visibilities as low as
a quarter-mile, wind gusts between 20 to 30 mph, and result in
rapidly changing weather and road conditions. A coating to up to
an inch of snow is expected in these snow squalls. These snow
showers and snow squalls are expected to impact today's afternoon
commute.

Precautionary/Preparedness Actions...

Be prepared for areas of reduced visibility in scattered snow
showers and squalls. This could lead to temporary whiteout
conditions and the potential for dangerous driving conditions in
snow squalls. If you are traveling and encounter adverse winter
driving conditions...reduce speed and make sure headlights are on.

Loconto
Special weather statement, Dec 18, 1:56 PM EST, 2 hours 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Boston/Norton MA
156 PM EST Wed Dec 18 2019

CTZ003-004-MAZ004-010>012-182000-
Tolland-Windham-Southern Worcester-Eastern Hampden-Northern
Worcester-Eastern Hampshire-
156 PM EST Wed Dec 18 2019

...A band of snow showers with a few snow squalls will affect
Tolland...Windham...Southern Worcester...Eastern Hampden...Northern
Worcester...Eastern Hampshire...

At 155 PM EST...A band of snow showers with a few embedded snow
squalls was along a line extending from near Hardwick to Wales to
near Willington, and was moving east at 20 mph.

Locations impacted include...
Worcester, Springfield, Amherst, Ludlow, Holden, Webster,
Southbridge, Auburn, East Longmeadow, Ellington, Belchertown,
Wilbraham, Oxford, Charlton, Palmer, Stafford, Spencer, Somers,
Dudley and Leicester.

Drivers need to remain alert. These conditions often lead to
accidents, especially on highways, since road conditions can change
rapidly. Avoid braking suddenly. Consider delaying travel until the
squalls pass.

Road conditions can deteriorate quickly in wintry weather. Be alert
for icy roads. Slow down and avoid braking suddenly. Allow extra
travel time.

&&

LAT...LON 4235 7251 4235 7236 4230 7236 4232 7233
      4235 7231 4234 7188 4209 7185 4193 7190
      4195 7249 4203 7251 4204 7252
TIME...MOT...LOC 1853Z 268DEG 18KT 4234 7227 4206 7226 4194 7225

EVT
Special weather statement, Dec 18, 2:19 PM EST, 1 hour 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Boston/Norton MA
219 PM EST Wed Dec 18 2019

CTZ002-003-MAZ009>011-182045-
Hartford-Tolland-Western Hampden-Eastern Hampden-Eastern Hampshire-
219 PM EST Wed Dec 18 2019

...An area of snow showers and embedded snow squalls will affect
Hartford...Tolland...Hampden and Eastern Hampshire counties.

At 216 PM EST...A cluster of snow showers and embedded snow squalls
was along a line extending from near Chester to near Hartland and
Litchfield, and was moving east at 25 mph.

Locations impacted include...
Springfield, Hartford, West Hartford, Manchester, Chicopee, East
Hartford, Enfield, Westfield, Holyoke, Glastonbury, Vernon, Windsor,
Agawam, West Springfield, Wethersfield, South Windsor, Farmington,
Simsbury, Ludlow and Bloomfield.

Drivers need to remain alert. These conditions often lead to
accidents, especially on highways, since road conditions can change
rapidly. Avoid braking suddenly. Consider delaying travel until the
snow showers and squalls pass.

Road conditions can deteriorate quickly in wintry weather. Be alert
for icy roads. Slow down and allow extra travel time.

&&

LAT...LON 4225 7296 4225 7291 4222 7287 4224 7286
      4220 7226 4218 7226 4216 7221 4194 7226
      4170 7247 4176 7301 4180 7302 4180 7296
      4182 7294 4188 7295 4190 7291 4197 7289
      4197 7303
TIME...MOT...LOC 1916Z 276DEG 22KT 4224 7295 4199 7303 4179 7323

EVT
Special weather statement, Dec 18, 3:54 PM EST, 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Boston/Norton MA
354 PM EST Wed Dec 18 2019

CTZ003-004-MAZ017-018-020-RIZ001-002-004-005-182145-
Tolland-Windham-Northern Bristol-Southern Bristol-Western
Plymouth-Northwest Providence-Bristol-Eastern Kent-Southeast
Providence-
354 PM EST Wed Dec 18 2019

...An area of snow showers and scattered snow squalls will affect
Tolland...Windham...Providence...Bristol RI...Bristol MA and
Plymouth counties...

At 350 PM EST...An area of snow showers and embedded snow squalls
was along a line extending from near Plainville to Woodstock,
Ellington and Pawtucket, was moving east at 20 mph.

Locations impacted include...
Providence, Warwick, Cranston, Pawtucket, Taunton, East Providence,
Coventry, Cumberland, North Providence, Vernon, Johnston, North
Attleborough, Mansfield, Windham, Plainfield, Attleboro,
Middleborough, Smithfield, Lincoln and Central Falls.

Drivers need to remain alert. These conditions often lead to
accidents, especially on highways, since road conditions can change
rapidly. Avoid braking suddenly. Consider delaying travel until the
squalls pass.

Road conditions can deteriorate quickly in wintry weather. Be alert
for icy roads. Slow down and allow extra travel time.

&&

LAT...LON 4200 7130 4183 7081 4178 7108 4179 7112
      4175 7131 4175 7136 4179 7137 4178 7139
      4174 7138 4170 7206 4188 7248
TIME...MOT...LOC 2050Z 291DEG 18KT 4200 7130 4193 7197 4188 7248

EVT

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 18, 2:19 PM ESTSpecial Weather StatementBOX86 min
Dec 18, 3:54 PM ESTSpecial Weather StatementBOX51 min
Dec 18, 4:12 AM ESTWind AdvisoryBOXWashington29 hr
Dec 18, 4:47 PM ESTSpecial Weather StatementBOXBristol, Kent, Providence58 min
Dec 18, 5:18 PM ESTSnow Squall WarningBOXBristol, Kent, Newport, Providence, Washington42 min
Dec 18, 5:59 PM ESTSnow Squall WarningBOXNewport31 min

Nearby

Snow Squall Warnings in Rhode Island, 2019Snow Squall Warnings in Connecticut, 2019Every snow squall warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.