Alert archive / Massachusetts / Areal Flood Warnings in 2018

Areal Flood Warning 29, NWS Boston/Norton, MA

July 25, 2018Franklin County, Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this areal flood warning at Jul 25, 2018, 10:10 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 25, 2018, 10:10 PM EDT (02:10 UTC)
Expired
Jul 26, 2018, 1:00 AM EDT
In force
3 hr
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 121 km from the middle of the area, began a volume at 02:15 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

Albany, NY (KALY), launched 00:00Z, 2.2 hours before the alert went out and 105 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, Albany, NY at 00:00Z on 2018-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 574 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, Albany, NY at 00:00Z on 2018-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 square meters per square second.193958Sfc1 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
574 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
628 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at Jul 25, 7:21 PM EDT, 2 hours 49 minutes earlier.

Area forecast discussion, Jul 25, 7:21 PM EDT, 2 hours 49 minutes before
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Hazardous weather outlook, Jul 25, 3:50 PM EDT, 6 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
350 PM EDT Wed Jul 25 2018

CTZ002>004-MAZ002>021-026-RIZ001>007-262000-
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-Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-
350 PM EDT Wed Jul 25 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING...

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...This afternoon and tonight.

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

   Flash Flood Watch.

In addition, strong thunderstorms may be capable of producing minor
wind damage, such as downed branches or weakened trees.

.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.

   Flash Flood Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ022>024-RIZ008-262000-
Barnstable MA-Dukes MA-Nantucket MA-Block Island RI-
350 PM EDT Wed Jul 25 2018

This Hazardous Weather Outlook is for southeastern Massachusetts
and southern Rhode Island.

.DAY ONE...This afternoon and tonight.

Localized flash flooding of urban areas and small streams is
possible into Thursday.

In addition, strong thunderstorms may be capable of producing minor
wind damage, such as downed branches or weakened trees.

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

.SPOTTER INFORMATION STATEMENT...

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

ANZ230>237-250-251-254>256-262000-
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-
350 PM EDT Wed Jul 25 2018

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

.DAY ONE...This afternoon and tonight.

Heavy rain with a few strong thunderstorms are possible into Thursday
morning.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

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

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

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 2:32 AM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester28 min
Jul 26, 3:00 AM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester30 min
Jul 26, 3:45 AM EDTSpecial Weather StatementBOXMiddlesex45 min
Jul 26, 1:24 PM EDTSpecial Weather StatementBOXWorcester51 min
Jul 26, 1:30 PM EDTSpecial Weather StatementBOXWorcester45 min
Jul 26, 2:35 PM EDTSpecial Weather StatementBOXWorcester55 min
Jul 26, 2:43 PM EDTSpecial Weather StatementBOXMiddlesex62 min
Jul 26, 3:35 PM EDTSpecial Weather StatementBOXNorfolk, Suffolk55 min
Jul 26, 4:20 PM EDTSpecial Weather StatementBOXNorfolk40 min
Jul 26, 5:32 PM EDTSpecial Weather StatementBOXBarnstable, Bristol, Plymouth88 min
Jul 25, 10:13 PM EDTAreal Flood AdvisoryBOXCapitol Planning Region2 hr

Nearby

Areal Flood Warnings in Massachusetts, 2018Every areal flood warning 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.