Alert archive / Massachusetts / Flash Flood Warnings in 2013

Flash Flood Warning 38, NWS Boston/Norton, MA

July 23, 20136 counties in Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 23, 2013, 5:00 PM EDT for 6 counties in Massachusetts. It was in force for 2 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 23, 2013, 5:00 PM EDT (21:00 UTC)
Expired: Jul 23, 2013, 7:00 PM EDT
In force: 2 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Bristol County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 31 km from the middle of the area, began a volume at 21:01 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, 9.0 hours before the alert went out and 105 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: 757 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

519 
WGUS51 KBOX 232100
FFWBOX
MAC005-017-021-023-025-027-232300-
/O.NEW.KBOX.FF.W.0038.130723T2100Z-130723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
500 PM EDT TUE JUL 23 2013

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS...
  SOUTH CENTRAL SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
  NORFOLK COUNTY IN EASTERN MASSACHUSETTS...
  NORTHERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...
  SOUTHEASTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  EXTREME NORTH CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 700 PM EDT

* AT 456 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA.  FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  QUINCY...FRAMINGHAM...WEYMOUTH...FRANKLIN...MILFORD...AVON... 
  BRAINTREE...RANDOLPH...STOUGHTON...MEDWAY...NORWOOD... 
  MILTON...ROCKLAND...HOLBROOK...MEDFIELD...SHARON... 
  CANTON...WALPOLE...HINGHAM...SCITUATE...NORWELL... 
  SHERBORN...NORFOLK...BELLINGHAM AND MENDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.  MOVE TO HIGHER GROUND.

&&

LAT...LON 4208 7113 4206 7160 4231 7158 4235 7139
      4219 7131 4228 7102 4226 7097 4229 7094
      4225 7096 4226 7090 4225 7088 4227 7088
      4225 7087 4226 7085 4228 7086 4221 7073
      4217 7071 4216 7073 4214 7070

$$

MD

2 follow-up statements

100 
WGUS71 KBOX 232213
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
613 PM EDT TUE JUL 23 2013

MAC005-017-021-023-025-027-232300-
/O.CON.KBOX.FF.W.0038.000000T0000Z-130723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX MA-SUFFOLK MA-NORFOLK MA-PLYMOUTH MA-WORCESTER MA-
BRISTOL MA-
613 PM EDT TUE JUL 23 2013

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTH CENTRAL MIDDLESEX...SOUTH CENTRAL SUFFOLK...NORFOLK...NORTHERN
PLYMOUTH...SOUTHEASTERN WORCESTER AND EXTREME NORTH CENTRAL BRISTOL
COUNTIES...

AT 609 PM EDT...THE BULK OF THE RAIN HAS OR CONTINUES TO DIMINISH 
ACROSS THE FLASH FLOOD WARNING AREA.  HOWEVER...SPOTTERS...LAW 
ENFORCEMENT AND THE GENERAL PUBLIC CONTINUE TO INDICATE THAT DEEP 
PONDING OF WATER CONTINUES ON LOCAL ROADWAYS...WITH SOME ROADS 
REMAINING CLOSED.  THEREFORE...THE FLASH FLOOD WARNING CONTINUES 
DESPITE THE ENDING RAIN.  PLEASE HEED ANY ROAD CLOSURES.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
QUINCY...FRAMINGHAM...WEYMOUTH...FRANKLIN...MILFORD...AVON...
BRAINTREE...RANDOLPH...STOUGHTON...MEDWAY...WESTWOOD...NORWOOD...
MILTON...ROCKLAND...ABINGTON...HOLBROOK...MEDFIELD...SHARON... 
CANTON...WALPOLE...HINGHAM...SCITUATE...SHERBORN...BELLINGHAM AND 
MENDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.  MOVE TO HIGHER GROUND.

&&

LAT...LON 4208 7113 4206 7160 4231 7158 4235 7139
      4219 7131 4228 7102 4226 7097 4229 7094
      4225 7096 4226 7090 4225 7088 4227 7088
      4225 7087 4226 7085 4228 7086 4221 7073
      4217 7071 4216 7073 4214 7070

$$

MD

405 
WGUS71 KBOX 232252
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
652 PM EDT TUE JUL 23 2013

MAC005-017-021-023-025-027-232301-
/O.EXP.KBOX.FF.W.0038.000000T0000Z-130723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX MA-SUFFOLK MA-NORFOLK MA-PLYMOUTH MA-WORCESTER MA-
BRISTOL MA-
652 PM EDT TUE JUL 23 2013

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL MIDDLESEX...SOUTH
CENTRAL SUFFOLK...NORFOLK...NORTHERN PLYMOUTH...SOUTHEASTERN
WORCESTER AND EXTREME NORTH CENTRAL BRISTOL COUNTIES WILL EXPIRE AT
700 PM EDT...

THUNDERSTORMS WITH HEAVY RAIN HAVE ENDED...AND FLASH FLOODING IS NO 
LONGER EXPECTED. HOWEVER...IT MAY TAKE A FEW HOURS FOR EARLIER 
FLOODING TO SUBSIDE. DRIVERS SHOULD REMAIN ALERT FOR FLOODED ROADS. 

&&

LAT...LON 4208 7113 4206 7160 4231 7158 4235 7139
      4219 7131 4228 7102 4226 7097 4229 7094
      4225 7096 4226 7090 4225 7088 4227 7088
      4225 7087 4226 7085 4228 7086 4221 7073
      4217 7071 4216 7073 4214 7070

$$

JWD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 10:31 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire	3 hr
Jul 23, 1:14 AM EDT	Flash Flood Warning	BOX	Franklin, Hampshire	2 hr
Jul 23, 4:12 AM EDT	Flash Flood Watch	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more	15 hr
Jul 23, 5:40 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire	3 hr
Jul 23, 6:15 AM EDT	Flash Flood Warning	BOX	Franklin	2 hr
Jul 23, 6:47 AM EDT	Areal Flood Advisory	BOX	Franklin, Worcester	3 hr
Jul 23, 10:22 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	113 min
Jul 23, 11:37 AM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	113 min
Jul 23, 12:43 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk	2 hr
Jul 23, 12:52 PM EDT	Special Weather Statement	BOX	Essex	38 min
Jul 23, 12:56 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	2 hr
Jul 23, 1:12 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk	2 hr
Jul 23, 1:25 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Suffolk	65 min
Jul 23, 1:26 PM EDT	Areal Flood Advisory	BOX	Essex, Norfolk, Plymouth, Suffolk	2 hr
Jul 23, 1:36 PM EDT	Special Marine Warning	BOX		54 min
Jul 23, 1:40 PM EDT	Special Weather Statement	BOX	Essex	50 min
Jul 23, 2:31 PM EDT	Areal Flood Advisory	BOX	Hampden, Hampshire, Worcester	119 min
Jul 23, 2:56 PM EDT	Special Weather Statement	BOX	Essex, Middlesex, Worcester	64 min
Jul 23, 3:13 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Worcester	2 hr
Jul 23, 3:34 PM EDT	Special Weather Statement	BOX	Essex, Middlesex	56 min
Jul 23, 3:38 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	52 min
Jul 23, 3:45 PM EDT	Special Marine Warning	BOX		90 min
Jul 23, 3:58 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex	2 hr
Jul 23, 4:15 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	2 hr
Jul 23, 4:20 PM EDT	Special Weather Statement	BOX	Suffolk	40 min
Jul 23, 4:40 PM EDT	Flash Flood Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	2 hr
Jul 23, 5:10 PM EDT	Special Weather Statement	BOX	Bristol	50 min

Nearby

Flash Flood Warnings in Massachusetts, 2013 Every flash flood warning in 2013

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.