Alert archive / Massachusetts / Flash Flood Warnings in 2011

Flash Flood Warning 12, NWS Boston/Norton, MA

September 1, 2011Franklin County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Sep 1, 2011, 6:01 PM EDT for Franklin County, Massachusetts. It was in force for 59 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
Sep 1, 2011, 6:01 PM EDT (22:01 UTC)
Expired
Sep 1, 2011, 7:00 PM EDT
In force
59 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

County Franklin County, MA

The radar

The Albany radar (KENX), 108 km from the middle of the area, began a volume at 22:04 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, 10.0 hours before the alert went out and 89 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 2011-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2011-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
803 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
51 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.

888 
WGUS51 KBOX 012201
FFWBOX
MAC011-012300-
/O.NEW.KBOX.FF.W.0012.110901T2201Z-110901T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
601 PM EDT THU SEP 1 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

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

* UNTIL 700 PM EDT

* AT 552 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER CHARLEMONT INTO SOUTHERN
  COLRAIN.

THIS THUNDERSTORM HAS BECOME NEARLY STATIONARY ACROSS EASTERN 
CHARLEMONT. WEATHER RADAR HAS INDICATED THAT THIS STORM MAY BE 
PRODUCING UP TO 3 INCHES OF RAIN IN AN HOUR.

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 4264 7271 4260 7273 4262 7279 4265 7278

$$

EVT
1 follow-up statement
151 
WGUS71 KBOX 012302
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
702 PM EDT THU SEP 1 2011

MAC011-012312-
/O.EXP.KBOX.FF.W.0012.000000T0000Z-110901T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN MA-
702 PM EDT THU SEP 1 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL FRANKLIN COUNTY...

THE HEAVY RAINFALL ACROSS COLRAIN AND CHARLEMONT HAS MOVED TO THE 
EAST. 

LAT...LON 4264 7271 4260 7273 4262 7279 4265 7278

$$

EVT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 3:29 PM EDTSpecial Weather StatementBOXFranklin61 min
Sep 1, 3:44 PM EDTSmall Craft Advisory for Hazardous SeasBOX49 hr
Sep 1, 3:46 PM EDTAreal Flood AdvisoryBOXFranklin3 hr

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.