Alert archive / Massachusetts / Flash Flood Warnings in 2011

Flash Flood Warning 7, NWS Boston/Norton, MA

August 1, 2011Franklin County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 1, 2011, 4:07 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 82 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 1, 2011, 4:07 PM EDT (20:07 UTC)
Expired
Aug 1, 2011, 5:29 PM EDT
In force
82 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

Counties Franklin County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 127 km from the middle of the area, began a volume at 20:09 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

Albany, NY (KALY), launched 12:00Z, 8.1 hours before the alert went out and 121 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 12:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1159 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 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.193958Sfc1 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
1159 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
824 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
116 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.

927 
WGUS51 KBOX 012007
FFWBOX
MAC011-027-012300-
/O.NEW.KBOX.FF.W.0007.110801T2007Z-110801T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
407 PM EDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  NORTHEASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 700 PM EDT

* AT 405 PM EDT...RADAR INDICATED TORRENTIAL RAINS FALLING FROM 
THUNDERSTORMS OVER THE BERNARDSTON AND GILL AREAS...AS WELL AS 
SURROUNDING COMMUNITIES.  RAINFALL RATES OF UP TO 3 INCHES IN ONE 
HOUR OR MORE ARE POSSIBLE WITH THESE STORMS THROUGH 5 PM. AS A 
RESULT...FLASH FLOODING IS EXPECTED. 

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 4272 7253 4272 7211 4271 7209 4246 7228
      4261 7257

$$

NMB
1 follow-up statement
486 
WGUS71 KBOX 012129
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
529 PM EDT MON AUG 1 2011

MAC011-027-012136-
/O.CAN.KBOX.FF.W.0007.000000T0000Z-110801T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WORCESTER MA-FRANKLIN MA-
529 PM EDT MON AUG 1 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
FRANKLIN AND NORTHWESTERN WORCESTER COUNTIES...

FOR NOW...THUNDERSTORMS HAVE EXITED THE MAJORITY OF THE AREA FROM 
WENDELL NORTHWARD TO THE MASSACHUSETTS/NEW HAMPSHIRE BORDER...NEAR 
NORTHFIELD TO ROYALSTON.  FLOODING HAS NOT BEEN REPORTED IN THIS 
AREA.  AS A RESULT...THE FLASH FLOOD WARNING HAS BEEN CANCELED.  

HOWEVER...A FLOOD ADVISORY DOES REMAIN IN EFFECT UNTIL 745 PM FROM 
MONTAGUE SOUTHEAST TO QUABBIN RESERVOIR...FOR THUNDERSTORMS MOVING 
THROUGH THAT AREA.  MINOR POOR DRAINAGE FLOODING IS EXPECTED IN THAT 
AREA. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT 
MONDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND 
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

LAT...LON 4272 7253 4272 7211 4271 7209 4246 7228
      4261 7257

$$

NMB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 12:37 PM EDTSpecial Weather StatementBOXHampshire53 min
Aug 1, 1:24 PM EDTSpecial Weather StatementBOXHampshire51 min
Aug 1, 1:27 PM EDTAreal Flood AdvisoryBOXFranklin, Hampshire, Worcester3 hr
Aug 1, 1:34 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Worcester19 min
Aug 1, 1:41 PM EDTFlash Flood WarningBOXFranklin, Hampshire, Worcester3 hr
Aug 1, 1:55 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire35 min
Aug 1, 2:03 PM EDTSpecial Weather StatementBOXFranklin42 min
Aug 1, 2:08 PM EDTSpecial Weather StatementBOXHampden52 min
Aug 1, 2:13 PM EDTSevere Thunderstorm WarningBOXHampden47 min
Aug 1, 2:19 PM EDTFlash Flood WarningBOXHampden, Hampshire, Worcester116 min
Aug 1, 2:19 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire41 min
Aug 1, 3:01 PM EDTSpecial Weather StatementBOXWorcester59 min
Aug 1, 3:05 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester17 min
Aug 1, 3:10 PM EDTSpecial Weather StatementBOXFranklin50 min
Aug 1, 3:14 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Worcester38 min
Aug 1, 3:18 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester42 min
Aug 1, 3:30 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester45 min
Aug 1, 3:33 PM EDTSpecial Weather StatementBOXHampden57 min
Aug 1, 3:40 PM EDTAreal Flood AdvisoryBOXFranklin, Worcester113 min
Aug 1, 3:41 PM EDTSevere Thunderstorm WarningBOXHampden49 min
Aug 1, 3:59 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester61 min
Aug 1, 4:08 PM EDTSpecial Weather StatementBOXEssex67 min
Aug 1, 4:15 PM EDTAreal Flood AdvisoryBOXHampden3 hr
Aug 1, 4:31 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester27 min
Aug 1, 4:37 PM EDTSpecial Weather StatementBOXFranklin23 min
Aug 1, 4:42 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Worcester63 min
Aug 1, 4:55 PM EDTAreal Flood AdvisoryBOXFranklin, Hampshire, Worcester3 hr
Aug 1, 5:29 PM EDTSpecial Weather StatementBOXFranklin31 min
Aug 1, 6:29 PM EDTSpecial Weather StatementBOXHampshire46 min

Nearby

Flash Flood Warnings in Massachusetts, 2011Every flash flood warning in 2011

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.