Alert archive / Massachusetts / Flash Flood Warnings in 2014

Flash Flood Warning 21, NWS Boston/Norton, MA

July 15, 2014Franklin County, Massachusetts; Cheshire County, New Hampshire

NWS Boston/Norton, MA issued this flash flood warning at Jul 15, 2014, 9:56 PM EDT for Franklin County, Massachusetts; Cheshire County, New Hampshire. It was in force for 3 hr. 2 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 15, 2014, 9:56 PM EDT (01:56 UTC)
Expired
Jul 16, 2014, 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, Cheshire County, NH

The radar

The Albany radar (KENX), 133 km from the middle of the area, began a volume at 01:58 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 15, 11:04 PM EDTFLASH FLOODWinchester, NHROUTE 119 BY THE COVERED BRIDGE FLOODED OUT
Jul 15, 11:37 PM EDTFLASH FLOODWinchester, NHROUTE 119 BY COVERED BRIDGE CLOSED DUE TO FLOODING... ONE SIDE OF ROAD PARTIALLY WASHED OUT. OLD WESTPORT ROAD FLOODING INTO RESIDENCE.

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

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 1.9 hours before the alert went out and 113 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 2014-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 504 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 00:00Z on 2014-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939587897Sfc1 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
504 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
913 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

274 
WGUS51 KBOX 160156
FFWBOX
MAC011-NHC005-160500-
/O.NEW.KBOX.FF.W.0021.140716T0156Z-140716T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
956 PM EDT TUE JUL 15 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  SOUTHWESTERN CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 100 AM EDT

* AT 954 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN ARE 
  ESTIMATED TO HAVE ALREADY FALLEN ACROSS THE WARNED AREA. FLASH 
  FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GREENFIELD...SWANZEY...WINCHESTER...HINSDALE...CHESTERFIELD...
  NORTHFIELD...MARLBOROUGH...TROY...BERNARDSTON...GILL...RICHMOND...
  WARWICK...LEYDEN AND SOUTH VERNON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAPID AND POTENTIALLY LIFE THREATENING FLOODING OF SMALL STREAMS AND 
ROADWAYS IS IMMINENT. HEAD TO HIGHER GROUND IMMEDIATELY...ESPECIALLY 
AS FLOODING IS DIFFICULT TO SEE AT NIGHT. DO NOT DRIVE THROUGH 
FLOODED ROADS. FIND ALTERNATE ROUTES. MOST FLOOD DEATHS OCCUR IN 
VEHICLES. TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING IS ISSUED FOR RAPID AND POTENTIALLY LIFE
THREATENING FLOODING. IN URBAN AREAS AVOID FLOODED ROADS AND OBEY
ROAD CLOSURES. THOSE NEAR SMALL STREAMS MUST HEAD FOR HIGHER GROUND
IMMEDIATELY.

&&

LAT...LON 4290 7218 4263 7242 4263 7262 4273 7261
      4273 7246 4276 7247 4277 7249 4277 7252
      4278 7251 4281 7255 4291 7241

$$

SIPPRELL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 8:48 PM EDTSpecial Weather StatementBOXFranklin57 min
Jul 15, 10:29 PM EDTSpecial Weather StatementBOXWorcester46 min
Jul 15, 11:14 PM EDTSpecial Weather StatementBOXMiddlesex61 min
Jul 15, 11:49 PM EDTSpecial Weather StatementBOXBristol, Plymouth56 min
Jul 15, 11:51 PM EDTFlash Flood WarningBOXBristol, Plymouth3 hr
Jul 16, 12:31 AM EDTSpecial Weather StatementBOXBristol, Plymouth59 min
Jul 16, 12:55 AM EDTSpecial Marine WarningBOX65 min
Jul 16, 4:33 AM EDTSpecial Weather StatementBOXDukes57 min
Jul 16, 4:44 AM EDTAreal Flood AdvisoryBOXBarnstable, Bristol, Dukes, Plymouth2 hr
Jul 16, 7:38 AM EDTFlash Flood WarningBOXBristol3 hr
Jul 16, 8:32 AM EDTFlash Flood WarningBOXBristol, Plymouth118 min
Jul 16, 9:23 AM EDTSpecial Weather StatementBOXEssex, Norfolk, Suffolk52 min
Jul 16, 10:30 AM EDTFlash Flood WarningBOXBristol, Plymouth4 hr
Jul 16, 2:09 PM EDTSpecial Weather StatementBOXEssex, Norfolk, Suffolk81 min
Jul 16, 2:32 PM EDTFlash Flood WarningBOXEssex, Middlesex3 hr
Jul 16, 2:46 PM EDTSpecial Weather StatementBOXEssex, Suffolk59 min
Jul 16, 2:49 PM EDTFlash Flood WarningBOXEssex, Middlesex, Suffolk3 hr
Jul 16, 3:35 PM EDTSmall Craft Advisory for Hazardous SeasBOX24 hr
Jul 15, 8:21 PM EDTSpecial Weather StatementBOXCheshire39 min
Jul 15, 10:20 PM EDTFlash Flood WarningBOXCheshire, Hillsborough3 hr

Nearby

Flash Flood Warnings in Massachusetts, 2014Flash Flood Warnings in New Hampshire, 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.