Alert archive / Massachusetts / Flash Flood Warnings in 2014

Flash Flood Warning 15, NWS Boston/Norton, MA

July 4, 2014Bristol County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 4, 2014, 2:56 PM EDT for Bristol County, Massachusetts. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 4, 2014, 2:56 PM EDT (18:56 UTC)
Expired: Jul 4, 2014, 9:14 PM EDT
In force: 6 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Bristol County, MA

The radar

The Boston radar (KBOX), 29 km from the middle of the area, began a volume at 18:59 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, 6.9 hours before the alert went out and 94 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 633 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

415 
WGUS51 KBOX 041856
FFWBOX
MAC005-042045-
/O.NEW.KBOX.FF.W.0015.140704T1856Z-140704T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
256 PM EDT FRI JUL 4 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 445 PM EDT

* AT 251 PM EDT...DOPPLER RADAR INDICATED SHOWERS AND EMBEDDED 
  THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. 
  RAINFALL RATES OF ONE TO TWO INCHES ARE EXPECTED. FLASH FLOODING 
  IS EXPECTED IN URBAN AREAS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...FALL 
  RIVER...DARTMOUTH...SOMERSET...WESTPORT AND FREETOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4173 7115 4175 7113 4175 7114 4178 7115
      4178 7112 4176 7113 4177 7111 4179 7111
      4180 7103 4174 7100 4151 7098 4150 7104
      4151 7109 4150 7112

$$

KJC

3 follow-up statements

082 
WGUS51 KBOX 042038
FFWBOX
MAC005-050245-
/O.EXT.KBOX.FF.W.0015.000000T0000Z-140705T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
438 PM EDT FRI JUL 4 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 1045 PM EDT FRIDAY

* AT 434 PM EDT...DOPPLER RADAR CONTINUED TO INDICATE SHOWERS AND  
  THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO 
  THREE INCHES OF RAIN HAVE ALREADY FALLEN AND RAINFALL RATES UP TO 
  ONE INCH PER HOUR ARE EXPECTED. FLASH FLOODING IS EXPECTED.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FALL RIVER...DARTMOUTH...SOMERSET...WESTPORT AND FREETOWN.

ADDITIONAL RAINFALL AMOUNTS OF TWO TO FOUR INCHES ARE POSSIBLE IN 
THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

MOST FLOOD DEATHS OCCUR IN VEHICLES. TURN AROUND...DONT DROWN.

&&

LAT...LON 4173 7115 4175 7113 4175 7114 4178 7115
      4178 7112 4176 7113 4177 7111 4179 7111
      4180 7103 4174 7100 4151 7098 4150 7104
      4151 7109 4150 7112

$$

KJC

746 
WGUS71 KBOX 042247
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
647 PM EDT FRI JUL 4 2014

MAC005-050245-
/O.CON.KBOX.FF.W.0015.000000T0000Z-140705T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BRISTOL MA-
647 PM EDT FRI JUL 4 2014

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FRIDAY
FOR SOUTH CENTRAL BRISTOL COUNTY...

AT 639 PM EDT...DOPPLER RADAR INDICATED THAT WIDESPREAD RAIN 
CONTINUED ACROSS THE WARNED AREA...BUT THE INTENSITY HAS DIMINISHED. 
HOWEVER...DOPPLER RADAR ESTIMATES THAT BETWEEN 3 AND 6 INCHES OF 
RAIN HAS FALLEN THROUGH EARLY THIS EVENING.  THE HEAVIEST AMOUNTS 
WERE ACROSS THE DARTMOUTH AREA...WHERE THERE CONTINUE TO BE REPORTS 
OF FLASH FLOODING.  

EVEN THOUGH RAINFALL INTENSITIES HAVE DIMINISHED...WIDESPREAD 
MODERATE TO HEAVY RAIN WAS STILL OCCURRING.  THEREFORE...FLASH 
FLOODING WILL CONTINUE PARTICULARLY ACROSS THE DARTMOUTH AREA INTO 
THE EVENING.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4173 7115 4175 7113 4175 7114 4178 7115
      4178 7112 4176 7113 4177 7111 4179 7111
      4180 7103 4174 7100 4151 7098 4150 7104
      4151 7109 4150 7112

$$

FRANK

107 
WGUS71 KBOX 050114
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
914 PM EDT FRI JUL 4 2014

MAC005-050123-
/O.CAN.KBOX.FF.W.0015.000000T0000Z-140705T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BRISTOL MA-
914 PM EDT FRI JUL 4 2014

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL BRISTOL COUNTY IS
CANCELLED...

THE HEAVIEST RAIN HAS ENDED AND FLOOD WATERS HAVE RECEDED.  THEY ARE 
NO LONGER EXPECTED TO POSE A THREAT TO LIFE OR PROPERTY. PLEASE 
CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 4173 7115 4175 7113 4175 7114 4178 7115
      4178 7112 4176 7113 4177 7111 4179 7111
      4180 7103 4174 7100 4151 7098 4150 7104
      4151 7109 4150 7112

$$

FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 8:09 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Jul 3, 8:16 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	59 min
Jul 3, 8:48 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Middlesex, Worcester	57 min
Jul 3, 8:59 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	46 min
Jul 3, 9:51 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Worcester	39 min
Jul 3, 10:13 PM EDT	Special Weather Statement	BOX	Middlesex, Suffolk	47 min
Jul 3, 10:37 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	23 min
Jul 3, 10:40 PM EDT	Special Marine Warning	BOX		65 min
Jul 3, 10:54 PM EDT	Small Craft Advisory	BOX		47 hr
Jul 3, 10:55 PM EDT	Severe Thunderstorm Warning	BOX	Essex	35 min
Jul 3, 11:01 PM EDT	Special Marine Warning	BOX		59 min
Jul 3, 11:11 PM EDT	Hurricane Warning	BOX		30 hr
Jul 4, 4:48 AM EDT	Flash Flood Watch	BOX	Barnstable, Bristol, Dukes, Essex, Middlesex, Nantucket and 3 more	18 hr
Jul 4, 5:59 AM EDT	Hurricane Local Statement	BOX	Bristol, Dukes, Essex, Norfolk, Plymouth, Suffolk	23 hr
Jul 4, 12:29 PM EDT	Areal Flood Advisory	BOX	Bristol	2 hr
Jul 4, 1:21 PM EDT	Flash Flood Warning Emergency	BOX	Bristol, Plymouth	9 hr
Jul 4, 2:43 PM EDT	Areal Flood Advisory	BOX	Plymouth	2 hr
Jul 4, 4:00 PM EDT	Flash Flood Warning	BOX	Barnstable, Plymouth	7 hr
Jul 4, 4:59 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth, Suffolk	3 hr
Jul 4, 6:32 PM EDT	Areal Flood Advisory	BOX	Barnstable, Dukes, Nantucket	4 hr

Nearby

Flash Flood Warnings in Massachusetts, 2014 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.