Alert archive / Massachusetts / Flash Flood Warnings in 2014

Flash Flood Warning 30, NWS Boston/Norton, MA

July 28, 2014Essex County, Middlesex County, Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 28, 2014, 9:33 AM EDT for Essex County, Middlesex County, Suffolk County, Massachusetts. It was in force for 117 min. 10 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 28, 2014, 9:33 AM EDT (13:33 UTC)
Expired
Jul 28, 2014, 11:30 AM EDT
In force
117 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

Counties Essex County, MA, Middlesex County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 63 km from the middle of the area, began a volume at 13:34 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.

What was reported inside it

TimeReportWhereRemark
Jul 28, 9:44 AM EDTFLASH FLOODWinchester, MASWANSON STREET BRIDGE... CAR STUCK IN FLOOD WATERS. WATER IS UP TO AT LEAST THE FRONT BUMPER.
Jul 28, 9:45 AM EDTFLASH FLOODWinchester, MAFLOODING IN THE MAIN ROTARY SEVERAL INCHES IN DEPTH. WASHINGTON STREET BY ST. MARYS FLOODED AND NEARLY IMPASSABLE.
Jul 28, 9:47 AM EDTFLASH FLOODMedford, MAWINDSOR ROAD FLOODED AND CLOSED.
Jul 28, 9:50 AM EDTFLASH FLOODWinchester, MACHURCH STREET AT LEWIS STREET FLOODED AND NEARLY IMPASSABLE.
Jul 28, 9:52 AM EDTFLASH FLOODWinchester, MARAVENCROFT AT BAKER STREET MANHOLE COVERS POPPED OFF.
Jul 28, 9:54 AM EDTFLASH FLOODWinchester, MA2 CARS STUCK IN FLOOD WATERS AT WEDGEMERE STATION BRIDGE.
Jul 28, 10:03 AM EDTFLASH FLOODLynnfield, MALYNNFIELD TUNNEL ON ROUTE 1 IS FLOODED AND IMPASSABLE WITH 3 TO 4 FEET OF WATER.
Jul 28, 10:15 AM EDTFLASH FLOODDanvers, MAPORTIONS OF ROUTE 1 NORTH BOUND AND SOUTH BOUND FLOODED AND CLOSED. CARS STUCK.
Jul 28, 10:20 AM EDTFLASH FLOODArlington, MASEVERAL CARS STUCK IN FLOOD WATERS IN THE ARLINGTON HEIGHTS AND TURKEY HILL AREAS.
Jul 28, 10:20 AM EDTFLASH FLOODPeabody, MAROOSEVELT BLVD WITH 4 FEET OF WATER. ROUTE 1 NORTH BY THE 114 EXIT FLOODED WITH 3 FEET OF WATER AND SHUT DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 1.6 hours before the alert went out and 120 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 2014-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 454 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 2014-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
454 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
709 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

184 
WGUS51 KBOX 281333
FFWBOX
MAC009-017-025-281530-
/O.NEW.KBOX.FF.W.0030.140728T1333Z-140728T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
933 AM EDT MON JUL 28 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  EAST CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS...
  SOUTHWESTERN ESSEX COUNTY IN NORTHEAST MASSACHUSETTS...

* UNTIL 1130 AM EDT

* AT 931 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA.  FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* RADAR WAS ESTIMATING 1.5 TO 2 INCHES PER HOUR WITH THESE STORMS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BOSTON...LYNN...SOMERVILLE...MALDEN...MEDFORD...REVERE...PEABODY...
  ARLINGTON...EVERETT...SALEM...BEVERLY...WOBURN...CHELSEA...
  ANDOVER...NORTH ANDOVER...MELROSE...SAUGUS...DANVERS...WAKEFIELD...
  READING...STONEHAM...WINCHESTER...MARBLEHEAD...WINTHROP...NORTH
  READING...SWAMPSCOTT...LYNNFIELD...MIDDLETON...TOPSFIELD AND
  MANCHESTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAPID FLOODING OF STREETS AND UNDERPASSES IS IMMINENT. DO NOT DRIVE 
THROUGH FLOODED ROADS AND FIND ALTERNATE ROUTES. IN URBAN AREAS 
AVOID FLOODED ROADS AND OBEY ROAD CLOSURES. 

&&

LAT...LON 4257 7075 4253 7078 4256 7079 4254 7090
      4253 7090 4254 7087 4252 7089 4250 7089
      4252 7086 4251 7082 4251 7084 4246 7094
      4242 7091 4244 7094 4242 7099 4234 7096
      4239 7104 4241 7117 4265 7110

$$

KJC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 8:25 PM EDTSpecial Weather StatementBOXHampden50 min
Jul 28, 5:46 AM EDTSpecial Weather StatementBOXHampshire59 min
Jul 28, 6:54 AM EDTSevere Thunderstorm WarningBOXFranklin51 min
Jul 28, 8:44 AM EDTSpecial Weather StatementBOXSuffolk46 min
Jul 28, 8:50 AM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Norfolk, Suffolk40 min
Jul 28, 9:18 AM EDTAreal Flood AdvisoryBOXEssex, Middlesex, Norfolk, Suffolk57 min
Jul 28, 9:44 AM EDTTornado WarningBOXEssex25 min
Jul 28, 10:19 AM EDTSpecial Marine WarningBOX41 min
Jul 28, 2:40 PM EDTSpecial Weather StatementBOXFranklin50 min
Jul 28, 3:32 PM EDTSpecial Weather StatementBOXFranklin43 min
Jul 28, 3:58 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester62 min
Jul 28, 4:00 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester47 min
Jul 28, 4:14 PM EDTAreal Flood AdvisoryBOXFranklin, Worcester2 hr
Jul 28, 4:17 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester43 min
Jul 28, 4:24 PM EDTTornado WarningBOXHampden, Worcester21 min
Jul 28, 5:43 PM EDTAreal Flood AdvisoryBOXFranklin, Worcester2 hr
Jul 28, 5:47 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex58 min
Jul 28, 5:48 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire34 min
Jul 28, 6:18 PM EDTAreal Flood AdvisoryBOXEssex, Middlesex117 min
Jul 28, 6:22 PM EDTSevere Thunderstorm WarningBOXEssex23 min
Jul 28, 6:43 PM EDTSpecial Marine WarningBOX62 min

Nearby

Flash Flood Warnings in Massachusetts, 2014Every flash flood warning in 2014

Sources

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