Alert archive / Massachusetts / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS Boston/Norton, MA

August 15, 2012Newport County, Rhode Island; Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 15, 2012, 8:46 AM EDT for Newport County, Rhode Island; Bristol County, Plymouth County, Massachusetts. It was in force for 74 min. 5 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: Aug 15, 2012, 8:46 AM EDT (12:46 UTC)
Expired: Aug 15, 2012, 10:00 AM EDT
In force: 74 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Bristol County, MA, Plymouth County, MA, Newport County, RI

The radar

The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 12:48 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

Time	Report	Where	Remark
Aug 15, 9:25 AM EDT	FLOOD	Fall River, MA	FLOODING ON INTERSTATE 195 EAST BOUND BY THE ENTRANCE TO BRAGA BRIDGE
Aug 15, 9:25 AM EDT	FLASH FLOOD	Fall River, MA	DAVOL ST AT BATTLESHIP COVE FLOODED. SEVERAL VEHICLES STUCK.
Aug 15, 9:30 AM EDT	FLOOD	Fall River, MA	8 INCHES OF WATER ON ROOSEVELT AVE
Aug 15, 9:30 AM EDT	FLOOD	Somerset, MA	ROUTE 138 FLOODED WITH 4 TO 6 INCHES OF WATER. BUFFINGTON BROOK NEAR BANKFULL.
Aug 15, 9:40 AM EDT	FLOOD	New Bedford, MA	COVE STREET BEING CLOSED DUE TO 1 FOOT OF WATER ON ROADWAY

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, 0.8 hours before the alert went out and 87 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: 3 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

688 
WGUS51 KBOX 151246
FFWBOX
MAC005-023-RIC005-151400-
/O.NEW.KBOX.FF.W.0019.120815T1246Z-120815T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
846 AM EDT WED AUG 15 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN NEWPORT COUNTY IN RHODE ISLAND...
  EASTERN BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...TAUNTON...NEW BEDFORD...FALL RIVER...
  SOUTHWESTERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 1000 AM EDT

* AT 840 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.  RAINFALL 
RATES OF 1 TO 2 INCHES PER HOUR FROM THUNDERSTORMS MOVING ACROSS 
SOUTHEAST MASSACHUSETTS WILL RESULT IN FLASH FLOODING OF URBAN AREAS.

FLASH FLOODING OF SMALL STREAMS AND URBAN AREAS IS OCCURRING OR
IMMINENT. THOSE NEAR STREAMS AND CREEKS...OR IN AREAS PRONE TO
FLOODING SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. AVOID FLOODED
ROADS. THE WATER MAY BE TOO DEEP TO ALLOW VEHICLES TO CROSS SAFELY...
OR THE ROADWAY MAY BE UNDERMINED. TURN AROUND...DONT DROWN!

&&

LAT...LON 4165 7124 4170 7119 4170 7121 4199 7109
      4194 7074 4162 7081 4162 7085 4160 7081
      4158 7082 4157 7086 4162 7089 4159 7089
      4159 7092 4157 7093 4154 7093 4152 7121
      4154 7122 4152 7122 4152 7130

$$

KJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 6:58 AM EDT	Areal Flood Advisory	BOX	Bristol, Kent, Newport, Providence, Washington	113 min
Aug 15, 8:27 AM EDT	Areal Flood Advisory	BOX	Bristol, Newport	93 min
Aug 15, 3:48 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	3 hr
Aug 15, 4:54 AM EDT	Special Weather Statement	BOX	Franklin	51 min
Aug 15, 5:16 AM EDT	Severe Thunderstorm Warning	BOX	Hampden	44 min
Aug 15, 5:28 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	3 hr
Aug 15, 6:04 AM EDT	Special Weather Statement	BOX	Worcester	41 min
Aug 15, 6:14 AM EDT	Special Marine Warning	BOX		61 min
Aug 15, 9:15 AM EDT	Special Marine Warning	BOX		63 min
Aug 15, 9:41 AM EDT	Special Weather Statement	BOX	Barnstable, Dukes	64 min
Aug 15, 9:51 AM EDT	Areal Flood Advisory	BOX	Barnstable, Bristol, Dukes, Plymouth	67 min
Aug 15, 2:24 PM EDT	Special Weather Statement	BOX	Franklin	51 min
Aug 15, 5:39 PM EDT	Special Weather Statement	BOX	Hampden	66 min
Aug 15, 6:11 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	64 min
Aug 15, 6:24 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Aug 15, 7:14 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	27 min

Nearby

Flash Flood Warnings in Massachusetts, 2012 Flash Flood Warnings in Rhode Island, 2012 Every flash flood warning in 2012

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.