Alert archive / Massachusetts / Flash Flood Watches in 2021

Flash Flood Watch 1, NWS Boston/Norton, MA

June 8, 2021Capitol Planning Region, Connecticut; 5 counties in Massachusetts

NWS Boston/Norton, MA issued this flash flood watch at Jun 8, 2021, 12:54 PM EDT for Capitol Planning Region, Connecticut; 5 counties in Massachusetts. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jun 8, 2021, 12:54 PM EDT (16:54 UTC)
Expired
Jun 8, 2021, 9:22 PM EDT
In force
8 hr
Issued by
NWS Boston/Norton, MA
Flood severity
None

Counties Capitol Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 102 km from the middle of the area, began a volume at 16:54 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 12:00Z, 4.9 hours before the alert went out and 134 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 12:00Z on 2021-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 289 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2021-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 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
289 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
1170 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

794 
WGUS61 KBOX 081654
FFABOX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Boston/Norton MA
1254 PM EDT Tue Jun 8 2021

CTZ002-003-MAZ002>004-008>012-026-090100-
/O.NEW.KBOX.FF.A.0001.210608T1654Z-210609T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-Tolland CT-Western Franklin MA-Eastern Franklin MA-
Northern Worcester MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Northern Middlesex MA-
Including the cities of Milford, Fitchburg, Greenfield, Union, 
Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, 
Barre, Ayer, Orange, Chesterfield, Windsor Locks, Springfield, and 
Blandford
1254 PM EDT Tue Jun 8 2021

...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM EDT THIS EVENING...

The National Weather Service in Norton has issued a

* Flash Flood Watch for portions of northern Connecticut and 
  Massachusetts, including the following areas, in northern 
  Connecticut, Hartford CT and Tolland CT. In Massachusetts, Eastern 
  Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern 
  Middlesex MA, Northern Worcester MA, Southern Worcester MA, 
  Western Franklin MA, Western Hampden MA and Western Hampshire MA.

* Until 10 PM EDT this evening

* Scattered thunderstorms will continue to develop across the region 
  this afternoon into early this evening. Any thunderstorm that 
  develops will be capable of producing localized 2 to 4 inch 
  rainfall amounts in just one hour. This will result in the 
  potential for localized flash flooding.

* Do not drive through flooded roadways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not enter or cross flowing water or water of unknown depth.

&&

$$

HF
1 follow-up statement
422 
WGUS61 KBOX 090122
FFABOX

Flood Watch
National Weather Service Boston/Norton MA
922 PM EDT Tue Jun 8 2021

CTZ002-003-MAZ002>004-008>012-026-090230-
/O.CAN.KBOX.FF.A.0001.000000T0000Z-210609T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-Tolland CT-Western Franklin MA-Eastern Franklin MA-
Northern Worcester MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Northern Middlesex MA-
Including the cities of Milford, Fitchburg, Greenfield, Union, 
Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, 
Barre, Ayer, Orange, Chesterfield, Windsor Locks, Springfield, and 
Blandford
922 PM EDT Tue Jun 8 2021

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of northern Connecticut and 
Massachusetts, including the following areas, in northern 
Connecticut, Hartford and Tolland Counties. In Massachusetts, 
Franklin, Hampden, Hampshire, Northern Middlesex MA, and Worcester 
Counties has been cancelled.

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

$$

Belk

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 12:45 PM EDTSpecial Weather StatementBOX45 min
Jun 8, 2:10 PM EDTSpecial Weather StatementBOX50 min
Jun 8, 2:29 PM EDTSevere Thunderstorm WarningBOXCapitol Planning Region61 min
Jun 8, 2:56 PM EDTSevere Thunderstorm WarningBOXCapitol Planning Region43 min
Jun 8, 3:24 PM EDTSpecial Weather StatementBOX51 min
Jun 8, 3:28 PM EDTSpecial Weather StatementBOX47 min
Jun 8, 4:13 PM EDTSpecial Weather StatementBOX47 min
Jun 8, 12:35 PM EDTSpecial Weather StatementBOXHampshire40 min
Jun 8, 1:02 PM EDTFlash Flood WarningBOXHampshire55 min
Jun 8, 1:13 PM EDTSpecial Weather StatementBOXHampden47 min
Jun 8, 1:34 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire41 min
Jun 8, 1:39 PM EDTFlash Flood WarningBOXHampden, Hampshire67 min
Jun 8, 2:40 PM EDTSpecial Weather StatementBOXHampshire50 min
Jun 8, 3:09 PM EDTSpecial Weather StatementBOXWorcester51 min
Jun 8, 3:12 PM EDTSpecial Weather StatementBOXEssex48 min
Jun 8, 3:32 PM EDTSpecial Marine WarningBOX43 min
Jun 8, 3:37 PM EDTSpecial Weather StatementBOXHampshire38 min
Jun 8, 3:42 PM EDTSpecial Weather StatementBOXEssex48 min
Jun 8, 3:51 PM EDTSpecial Weather StatementBOXHampshire39 min
Jun 8, 3:52 PM EDTSpecial Marine WarningBOX53 min
Jun 8, 4:02 PM EDTSpecial Weather StatementBOXNorfolk43 min
Jun 8, 4:04 PM EDTSpecial Weather StatementBOXHampshire41 min
Jun 8, 4:13 PM EDTSpecial Weather StatementBOXEssex47 min
Jun 8, 4:38 PM EDTSpecial Marine WarningBOX52 min
Jun 8, 5:17 PM EDTSevere Thunderstorm WarningBOXBristol, Middlesex, Norfolk, Worcester58 min
Jun 8, 5:33 PM EDTSpecial Marine WarningBOX42 min
Jun 8, 5:59 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk, Plymouth, Suffolk35 min

Nearby

Flash Flood Watches in Massachusetts, 2021Flash Flood Watches in Connecticut, 2021Every flash flood watch in 2021

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.