Alert archive / Massachusetts / Heat Advisories in 2018

Heat Advisory 9, NWS Boston/Norton, MA

August 9, 20186 counties in Massachusetts; 5 counties in Rhode Island

NWS Boston/Norton, MA issued this heat advisory at Aug 9, 2018, 3:25 AM EDT for 6 counties in Massachusetts; 5 counties in Rhode Island. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Aug 9, 2018, 3:25 AM EDT (07:25 UTC)
Expired: Aug 9, 2018, 5:01 PM EDT
In force: 14 hr
Issued by: NWS Boston/Norton, MA

Counties Bristol County, MA, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 9 km from the middle of the area, began a volume at 07:28 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

Chatham, MA (KCHH), launched 00:00Z, 7.4 hours before the alert went out and 110 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1616 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Aug 9, 3:14 AM EDT, 11 minutes earlier.

Area forecast discussion, Aug 9, 3:14 AM EDT, 11 minutes before

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Hazardous weather outlook, Aug 8, 6:04 PM EDT, 9 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Boston/Norton MA
604 PM EDT Wed Aug 8 2018

CTZ002>004-MAZ002>024-026-RIZ001>008-092215-
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-Eastern Plymouth MA-Southern Bristol MA-
Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA-
Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-Block Island RI-
604 PM EDT Wed Aug 8 2018

This Hazardous Weather Outlook is for northern Connecticut, all of
Massachusetts east of Berkshire County, and Rhode Island.

.DAY ONE...Tonight.

A few strong to severe thunderstorms are possible this evening.

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

A few strong to severe thunderstorms are possible Thursday. Main
threat would be very localized strong to damaging wind gusts. In
addition, any thunderstorm that develop will be capable of producing
torrential rainfall, resulting a very localized flood threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-092215-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
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-
604 PM EDT Wed Aug 8 2018

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.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.

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

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston

In the hours before

Special weather statement, Aug 8, 11:24 PM EDT, 4 hours 1 minute before

Special Weather Statement
National Weather Service Boston/Norton MA
1124 PM EDT WED AUG 8 2018

MAZ002-003-008>011-090415-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampden MA-Eastern Franklin MA-Eastern Hampshire MA-
1124 PM EDT WED AUG 8 2018

...TORRENTIAL RAINFALL ...

At 1123 PM EDT, Doppler radar was tracking a strong thunderstorm over
Williamsburg, or near Northampton, moving northeast at 20 mph.

Heavy rain with minor flooding as well as winds in excess of 30 mph
will accompany this storm.

Locations impacted include...
Holyoke, Northampton, Deerfield, Easthampton, Montague, Southampton,
Hadley, Sunderland, Hatfield, Williamsburg, Huntington, Conway,
Leverett, Ashfield, Westhampton, Whately, Chester, Chesterfield,
Worthington and Goshen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4230 7300 4255 7285 4252 7249 4220 7266
      4225 7300
TIME...MOT...LOC 0323Z 224DEG 19KT 4239 7276

md

Special weather statement, Aug 8, 11:36 PM EDT, 3 hours 49 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
1136 PM EDT WED AUG 8 2018

MAZ003-004-090415-
Northern Worcester MA-Eastern Franklin MA-
1136 PM EDT WED AUG 8 2018

...STRONG THUNDERSTORM...

At 1135 PM EDT, Doppler radar was tracking a strong thunderstorm over
Montague, or near Greenfield, moving northeast at 25 mph.

Wind gusts up to 50 mph will accompany this storm.

Locations impacted include...
Greenfield, Orange, Gardner, Athol, Winchendon, Montague, Templeton,
Northfield, Fitzwilliam, Bernardston, Leverett, Erving, Shutesbury,
Phillipston, Gill, Royalston, Petersham, Richmond, New Salem and
Wendell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4272 7229 4272 7210 4253 7201 4247 7251
      4266 7257 4273 7231
TIME...MOT...LOC 0335Z 246DEG 23KT 4256 7249

md

Special weather statement, Aug 8, 11:57 PM EDT, 3 hours 28 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
1157 PM EDT WED AUG 8 2018

CTZ002-MAZ009-011-090445-
Hartford CT-Western Hampden MA-Eastern Hampden MA-
1157 PM EDT WED AUG 8 2018

...TORRENTIAL RAINFALL ...

At 1157 PM EDT, Doppler radar was tracking a thunderstorm over
Burlington, or near Bristol, moving northeast at 45 mph.

Heavy rain with localized flooding along with winds in excess of 30
mph will accompany this storm.

Locations impacted include...
West Hartford, Bristol, Enfield, Southington, Windsor, Agawam,
Farmington, Wolcott, Simsbury, Bloomfield, Avon, Plainville,
Longmeadow, Suffield, East Longmeadow, Windsor Locks, Granby, Canton,
Southwick and Burlington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4205 7298 4205 7251 4162 7293 4164 7294
      4164 7298 4180 7302 4181 7295 4184 7294
      4185 7295 4188 7295 4189 7294 4190 7291
      4197 7289 4197 7303
TIME...MOT...LOC 0357Z 225DEG 40KT 4177 7300

md

Special weather statement, Aug 9, 1:34 AM EDT, 1 hour 51 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
134 AM EDT THU AUG 9 2018

CTZ004-090600-
Windham CT-
134 AM EDT THU AUG 9 2018

...STRONG THUNDERSTORM...

At 133 AM EDT, Doppler radar was tracking a strong thunderstorm near
Scotland, or near Windham, moving northeast at 45 mph.

Winds in excess of 40 mph will accompany this storm.

Locations impacted include...
Windham, Plainfield, Willimantic, Killingly, Southbridge, Griswold,
Putnam, Thompson, Brooklyn, Woodstock, Willington, Canterbury,
Lisbon, Ashford, Pomfret, Sterling, Chaplin, Hampton, Eastford and
Scotland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4166 7209 4172 7223 4173 7219 4175 7218
      4175 7216 4183 7216 4184 7222 4189 7222
      4196 7219 4196 7210 4203 7210 4202 7180
      4171 7179 4164 7188 4163 7196
TIME...MOT...LOC 0533Z 227DEG 38KT 4173 7207

md

Special weather statement, Aug 9, 1:58 AM EDT, 1 hour 27 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
158 AM EDT THU AUG 9 2018

CTZ004-MAZ005-012-013-017-RIZ001-090700-
Windham CT-Southern Worcester MA-Northern Bristol MA-
Western Norfolk MA-Central Middlesex County MA-
Northwest Providence RI-
158 AM EDT THU AUG 9 2018

...STRONG THUNDERSTORM...

At 158 AM EDT, Doppler radar was tracking a strong thunderstorm near
Brooklyn, or 8 miles north of Plainfield, moving northeast at 30 mph.

Wind gusts up to 50 mph will accompany this storm.

Locations impacted include...
Woonsocket, Cumberland, Franklin, North Attleborough, Milford,
Plainfield, Smithfield, Lincoln, Killingly, Webster, Bellingham,
Burrillville, Northbridge, Hopkinton, Uxbridge, North Smithfield,
Wrentham, Scituate, Glocester and Putnam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4174 7193 4192 7200 4221 7155 4194 7136
TIME...MOT...LOC 0558Z 229DEG 26KT 4182 7191

mld

Special weather statement, Aug 9, 2:29 AM EDT, 56 minutes before

Special Weather Statement
National Weather Service Boston/Norton MA
229 AM EDT THU AUG 9 2018

CTZ004-RIZ001>004-090700-
Windham CT-Northwest Providence RI-Eastern Kent RI-Western Kent RI-
Southeast Providence RI-
229 AM EDT THU AUG 9 2018

...STRONG THUNDERSTORM...

At 229 AM EDT, Doppler radar was tracking a strong thunderstorm over
Sterling, or near Plainfield, moving northeast at 25 mph.

Winds in excess of 40 mph will accompany this storm.

Locations impacted include...
Providence, Warwick, Cranston, Coventry, North Providence, West
Warwick, Johnston, Plainfield, Smithfield, Lincoln, Killingly,
Scituate, West Greenwich, Canterbury, Foster, Sterling and Voluntown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4164 7179 4164 7189 4174 7194 4190 7147
      4171 7138 4160 7179
TIME...MOT...LOC 0629Z 241DEG 22KT 4173 7181

md

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 8:11 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	47 min
Aug 8, 8:14 PM EDT	Special Marine Warning	BOX		67 min
Aug 8, 8:20 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk	115 min
Aug 8, 8:25 PM EDT	Special Weather Statement	BOX	Worcester	50 min
Aug 8, 8:57 PM EDT	Areal Flood Warning	BOX	Middlesex, Norfolk, Suffolk, Worcester	2 hr
Aug 8, 9:06 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	54 min
Aug 8, 9:57 PM EDT	Special Weather Statement	BOX	Norfolk	48 min
Aug 8, 10:44 PM EDT	Special Weather Statement	BOX	Hampshire	61 min
Aug 8, 10:56 PM EDT	Special Weather Statement	BOX	Franklin	64 min
Aug 8, 11:24 PM EDT	Special Weather Statement	BOX	Hampshire	51 min
Aug 8, 11:36 PM EDT	Special Weather Statement	BOX	Franklin	39 min
Aug 9, 6:45 AM EDT	Special Marine Warning	BOX		60 min
Aug 9, 8:29 AM EDT	Special Marine Warning	BOX		46 min
Aug 9, 8:43 AM EDT	Special Weather Statement	BOX	Barnstable	47 min
Aug 9, 9:00 AM EDT	Severe Thunderstorm Warning	BOX	Barnstable	35 min
Aug 9, 9:12 AM EDT	Special Marine Warning	BOX		48 min
Aug 9, 9:41 AM EDT	Special Marine Warning	BOX		49 min
Aug 9, 9:43 AM EDT	Special Weather Statement	BOX	Barnstable	32 min
Aug 9, 9:56 AM EDT	Special Weather Statement	BOX	Barnstable	49 min
Aug 9, 9:57 AM EDT	Severe Thunderstorm Warning	BOX	Barnstable	33 min
Aug 9, 10:03 AM EDT	Special Marine Warning	BOX		57 min
Aug 9, 10:10 AM EDT	Areal Flood Advisory	BOX	Barnstable	3 hr
Aug 9, 10:43 AM EDT	Areal Flood Warning	BOX	Barnstable	3 hr
Aug 9, 3:26 PM EDT	Special Marine Warning	BOX		34 min
Aug 8, 9:19 PM EDT	Special Weather Statement	BOX	Providence	41 min
Aug 9, 1:58 AM EDT	Special Weather Statement	BOX	Providence	62 min
Aug 9, 2:29 AM EDT	Special Weather Statement	BOX	Kent	31 min
Aug 8, 10:28 PM EDT	Special Weather Statement	BOX		62 min
Aug 8, 11:57 PM EDT	Special Weather Statement	BOX		48 min
Aug 9, 1:34 AM EDT	Special Weather Statement	BOX		26 min

Nearby

Heat Advisories in Massachusetts, 2018 Heat Advisories in Rhode Island, 2018 Every heat advisory in 2018

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.