Alert archive / Massachusetts / Flash Flood Warnings in 2012

Flash Flood Warning 9, NWS Boston/Norton, MA

July 28, 2012Capitol Planning Region, Connecticut; Hampden County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 28, 2012, 3:33 PM EDT for Capitol Planning Region, Connecticut; Hampden County, Hampshire County, Worcester County, Massachusetts. It was in force for 3 hr. 3 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, 2012, 3:33 PM EDT (19:33 UTC)
Expired: Jul 28, 2012, 6:07 PM EDT
In force: 3 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Capitol Planning Region, CT, Hampden County, MA, Hampshire County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 112 km from the middle of the area, began a volume at 19:35 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
Jul 28, 3:57 PM EDT	FLASH FLOOD	Longmeadow, MA	CONVERSE ST FLOODED WITH MANY CARS STUCK
Jul 28, 4:00 PM EDT	FLASH FLOOD	East Longmeadow, MA	SECTION OF MILL BROOK DRIVE FLOODED WITH 2 FEET OF WATER.
Jul 28, 4:00 PM EDT	FLASH FLOOD	Longmeadow, MA	AVONDALE ROAD IS PARTIALLY WASHED OUT WITH A SINKHOLE ON THE SIDE OF THE ROAD.

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 12:00Z, 7.6 hours before the alert went out and 130 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: 285 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 66 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.

889 
WGUS51 KBOX 281933
FFWBOX
CTC003-013-MAC013-015-027-282230-
/O.NEW.KBOX.FF.W.0009.120728T1933Z-120728T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
333 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME WEST CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  NORTHEASTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  NORTHWESTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  EASTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
  EXTREME SOUTHEASTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 630 PM EDT

* AT 330 PM EDT...AN PERSISTENT AREA OF HEAVY SHOWERS AND 
  THUNDERSTORMS WAS OVER SOUTH CENTRAL MASSACHUSETTS AND NORTH 
  CENTRAL CONNECTICUT. FLOODING WAS REPORTED IN LONGMEADOW WHERE 
  MORE THAN 3 INCHES OF RAIN HAS FALLEN. AN ADDITIONAL 1 TO 3 
  INCHES OF RAIN IS POSSIBLE.

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 4205 7257 4210 7253 4223 7248 4222 7222
      4197 7237 4197 7261

$$
FIELD

2 follow-up statements

322 
WGUS71 KBOX 282058
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
458 PM EDT SAT JUL 28 2012

CTC003-013-MAC013-015-027-282230-
/O.CON.KBOX.FF.W.0009.000000T0000Z-120728T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARTFORD CT-TOLLAND CT-WORCESTER MA-HAMPSHIRE MA-HAMPDEN MA-
458 PM EDT SAT JUL 28 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
EASTERN HAMPDEN...EXTREME SOUTHEASTERN HAMPSHIRE...EXTREME WEST
CENTRAL WORCESTER...NORTHWESTERN TOLLAND AND NORTHEASTERN HARTFORD
COUNTIES...

AT 452 PM EDT...THE THREAT OF FLASH FLOODING IS GREATLY REDUCED NOW 
THAT THE LINE OF HEAVIEST RAINFALL HAS MOVED EASTWARD INTO CENTRAL 
AND EASTERN MASSACHUSETTS AND EASTERN CONNECTICUT. HOWEVER...LIGHT 
TO MODERATE RAIN WAS STILL FALLING IN THE WARNED AREA WHICH MAY 
CAUSE STREAMS TO CONTINUE TO RISE AND CAUSE ADDITIONAL PONDING OF 
WATER ON ROADWAYS. THE WARNING WILL LIKELY BE ALLOWED TO EXPIRE AT 
545 PM.

LAT...LON 4205 7257 4210 7253 4223 7248 4222 7222
      4197 7237 4197 7261

$$
FIELD

723 
WGUS71 KBOX 282207
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
607 PM EDT SAT JUL 28 2012

CTC003-013-MAC013-015-027-282217-
/O.CAN.KBOX.FF.W.0009.000000T0000Z-120728T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARTFORD CT-TOLLAND CT-WORCESTER MA-HAMPSHIRE MA-HAMPDEN MA-
607 PM EDT SAT JUL 28 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN HAMPDEN...
EXTREME SOUTHEASTERN HAMPSHIRE...EXTREME WEST CENTRAL WORCESTER...
NORTHWESTERN TOLLAND AND NORTHEASTERN HARTFORD COUNTIES...

WHILE LIGHT TO MODERATE RAIN IS EXPECTED TO CONTINUE IN SOUTHERN 
MASSACHUSETTS AND NORTHERN CONNECTICUT THIS EVENING...THERE IS NO 
LONGER A THREAT FOR FLASH FLOODING.

LAT...LON 4205 7257 4210 7253 4223 7248 4222 7222
      4197 7237 4197 7261

$$
FIELD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 3:54 AM EDT	Flash Flood Watch	BOX	Capitol Planning Region	24 hr
Jul 28, 12:46 PM EDT	Special Weather Statement	BOX		59 min
Jul 28, 12:59 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	6 hr
Jul 28, 1:48 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region	117 min
Jul 28, 2:11 PM EDT	Special Weather Statement	BOX		64 min
Jul 28, 2:39 PM EDT	Special Weather Statement	BOX		51 min
Jul 28, 3:00 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	3 hr
Jul 28, 3:18 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	3 hr
Jul 28, 3:24 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	3 hr
Jul 28, 3:44 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region	2 hr
Jul 28, 4:01 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	2 hr
Jul 28, 4:47 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	3 hr
Jul 28, 11:50 AM EDT	Special Weather Statement	BOX	Hampden	55 min
Jul 28, 12:50 PM EDT	Special Weather Statement	BOX	Worcester	25 min
Jul 28, 1:35 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Jul 28, 2:28 PM EDT	Areal Flood Advisory	BOX	Hampden, Hampshire, Worcester	3 hr
Jul 28, 3:41 PM EDT	Special Weather Statement	BOX	Worcester	49 min
Jul 28, 4:13 PM EDT	Special Weather Statement	BOX	Norfolk	62 min
Jul 28, 6:42 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	3 hr
Jul 28, 7:25 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	3 hr
Jul 28, 7:31 PM EDT	Flash Flood Warning	BOX	Bristol	59 min

Nearby

Flash Flood Warnings in Massachusetts, 2012 Flash Flood Warnings in Connecticut, 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.