Alert archive / Connecticut / Flash Flood Warnings in 2012

Flash Flood Warning 20, NWS Boston/Norton, MA

August 15, 2012Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this flash flood warning at Aug 15, 2012, 5:59 PM EDT for Capitol Planning Region, Connecticut. It was in force for 68 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 15, 2012, 5:59 PM EDT (21:59 UTC)
Expired
Aug 15, 2012, 7:07 PM EDT
In force
68 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

County Capitol Planning Region, CT

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.0 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1897 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, Brookhaven, NY at 12:00Z on 2012-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
1897 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
686 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

526 
WGUS51 KBOX 152159
FFWBOX
CTC003-160100-
/O.NEW.KBOX.FF.W.0020.120815T2159Z-120816T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF BRISTOL...

* UNTIL 900 PM EDT

* AT 555 PM EDT...THUNDERSTORMS WITH TORRENTIAL RAINFALL WERE LINING
  UP FROM CANTON TO BURLINGTON...AND WERE MOVING SLOWLY SOUTHEAST AT
  10 MPH. DOPPLER RADAR ESTIMATES RAINFALL RATES OF 2 TO 3 INCHES
  PER HOUR...WHICH IS ENOUGH TO CAUSE FLASH FLOODING OF STREAMS AND
  URBAN AREAS.

  THIS INCLUDES...BUT IS NOT LIMITED TO...THE WEST BRANCH OF THE
  FARMINGTON RIVER...PHELPS BROOK...BURLINGTON BROOK AND CHERRY
  BROOK.

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 4181 7295 4184 7295 4185 7296 4186 7296
      4189 7295 4191 7279 4166 7280 4165 7299
      4177 7302 4180 7302

$$

JWD
1 follow-up statement
730 
WGUS71 KBOX 152307
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
707 PM EDT WED AUG 15 2012

CTC003-152317-
/O.CAN.KBOX.FF.W.0020.000000T0000Z-120816T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARTFORD CT-
707 PM EDT WED AUG 15 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL
HARTFORD COUNTY...

HEAVY RAINFALL HAS ENDED IN WESTERN HARTFORD COUNTY AND THERE IS NO 
LONGER THE THREAT OF FLASH FLOODING.

&&

LAT...LON 4181 7295 4184 7295 4185 7296 4186 7296
      4189 7295 4191 7279 4166 7280 4165 7299
      4177 7302 4180 7302

$$

JWD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 3:48 AM EDTAreal Flood AdvisoryBOXCapitol Planning Region3 hr
Aug 15, 5:16 AM EDTSevere Thunderstorm WarningBOXCapitol Planning Region44 min
Aug 15, 5:28 AM EDTAreal Flood AdvisoryBOXCapitol Planning Region, Northeastern Connecticut Planning Region3 hr
Aug 15, 6:58 AM EDTAreal Flood AdvisoryBOXNortheastern Connecticut Planning Region113 min
Aug 15, 5:43 PM EDTSpecial Weather StatementBOX62 min

Nearby

Flash Flood Warnings in Connecticut, 2012Every 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; the sounding from the Mesonet's radiosonde archive.