Alert archive / Massachusetts / Heat Advisories in 2019

Heat Advisory 5, NWS Boston/Norton, MA

August 18, 20195 counties in Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this heat advisory at Aug 18, 2019, 3:27 PM EDT for 5 counties in Massachusetts; Capitol Planning Region, Connecticut. It took effect at Aug 19, 2019, 11:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Aug 18, 2019, 3:27 PM EDT (19:27 UTC)
In effect from
Aug 19, 2019, 11:00 AM EDT
Expired
Aug 19, 2019, 5:31 PM EDT
In force
7 hr
Issued by
NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Bristol County, MA, Hampden County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 40 km from the middle of the area, began a volume at 19:29 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 12:00Z, 7.5 hours before the alert went out and 142 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, Chatham, MA at 12:00Z on 2019-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 112 joules per kilogram.LCLLFCEL10008507005003002001001 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, Chatham, MA at 12:00Z on 2019-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.19395878Sfc1 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
112 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
621 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 18, 10:36 AM EDT, 4 hours 51 minutes earlier.

Area forecast discussion, Aug 18, 10:36 AM EDT, 4 hours 51 minutes before
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Hazardous weather outlook, Aug 18, 4:16 AM EDT, 11 hours 11 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
416 AM EDT Sun Aug 18 2019

CTZ002>004-MAZ002>019-026-RIZ001>003-190830-
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-Northern Middlesex MA-
Northwest Providence RI-Southeast Providence RI-Western Kent RI-
416 AM EDT Sun Aug 18 2019

This Hazardous Weather Outlook is for northern Connecticut, all of
Massachusetts east of the Berkshires except for southeastern
Massachusetts, and northern Rhode Island.

.DAY ONE...Today and tonight.

A few strong thunderstorms are possible this afternoon and evening,
mainly to the northwest of the Boston to Providence corridor.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

A few strong thunderstorms are also possible Tuesday and Wednesday.

Heat advisories may be needed early next week, especially for
portions of the Connecticut and Merrimack valleys.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ020>024-RIZ004>008-190830-
Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA-
Nantucket MA-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-
Block Island RI-
416 AM EDT Sun Aug 18 2019

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EDT THIS MORNING...

This Hazardous Weather Outlook is for southeastern Massachusetts and
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.

   Dense Fog Advisory.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

A few strong thunderstorms are also possible Tuesday and Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-190830-
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-
416 AM EDT Sun Aug 18 2019

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

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

A few strong thunderstorms are possible Tuesday and Wednesday.

.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

Local storm report, Aug 18, 3:14 PM EDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
314 PM EDT SUN AUG 18 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     FLASH FLOOD      WESTERLY                41.37N  71.81W
08/17/2019                   WASHINGTON         RI   EMERGENCY MNGR

            FLOODING ON SUNSET DRIVE, ATLANTIC AVE, AND OCEAN VIEW
            AVE

&&

EVENT NUMBER BOX1902860

AED

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:08 PM EDTSevere Thunderstorm WarningBOXFranklin42 min
Aug 17, 8:13 PM EDTSevere Thunderstorm WarningBOXFranklin, Middlesex, Worcester62 min
Aug 17, 8:28 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester47 min
Aug 17, 9:12 PM EDTSpecial Weather StatementBOXWorcester48 min
Aug 17, 9:55 PM EDTSpecial Weather StatementBOXMiddlesex50 min
Aug 18, 3:03 AM EDTDense Fog AdvisoryBOXBarnstable, Bristol, Dukes, Nantucket, Plymouth6 hr
Aug 18, 5:39 PM EDTSevere Thunderstorm WarningBOXWorcester51 min
Aug 18, 6:24 PM EDTSevere Thunderstorm WarningBOXNorfolk, Worcester40 min
Aug 18, 7:24 PM EDTSpecial Weather StatementBOXHampden36 min
Aug 18, 6:33 PM EDTSpecial Weather StatementBOX27 min
Aug 18, 6:48 PM EDTSpecial Weather StatementBOX27 min

Nearby

Heat Advisories in Massachusetts, 2019Heat Advisories in Connecticut, 2019Every heat advisory 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.