Alert archive / Connecticut / Flash Flood Warnings in 2015

Flash Flood Warning 2, NWS Boston/Norton, MA

May 31, 2015Northeastern Connecticut Planning Region, Connecticut; Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at May 31, 2015, 4:33 PM EDT for Northeastern Connecticut Planning Region, Connecticut; Worcester County, Massachusetts. It was in force for 3 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: May 31, 2015, 4:33 PM EDT (20:33 UTC)
Expired: May 31, 2015, 7:30 PM EDT
In force: 3 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Northeastern Connecticut Planning Region, CT, Worcester County, MA

The radar

The Boston radar (KBOX), 77 km from the middle of the area, began a volume at 20:35 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.6 hours before the alert went out and 142 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: 106 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 41 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.

327 
WGUS51 KBOX 312033
FFWBOX
CTC013-015-MAC027-312330-
/O.NEW.KBOX.FF.W.0002.150531T2033Z-150531T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
433 PM EDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN WINDHAM COUNTY IN NORTHERN CONNECTICUT...
  NORTHEASTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  SOUTH CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...

* UNTIL 730 PM EDT

* AT 431 PM EDT...DOPPLER RADAR INDICATED HEAVY RAIN AND EMBEDDED 
  THUNDERSTORMS ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN 
  HAVE ALREADY FALLEN.  AN ADDITIONAL 1 TO 3 INCHES OF RAIN IS 
  EXPECTED IN THE NEXT HOUR OR TWO.  FLASH FLOODING IS EXPECTED TO 
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MANSFIELD...KILLINGLY...WEBSTER...SOUTHBRIDGE...BURRILLVILLE...
  ELLINGTON...TOLLAND...OXFORD...CHARLTON...STAFFORD...SOMERS...
  DUDLEY...PUTNAM...THOMPSON...STURBRIDGE...SUTTON...DOUGLAS...
  BROOKLYN...WOODSTOCK...WILLINGTON...ASHFORD...POMFRET...HOLLAND...
  CHAPLIN...HAMPTON...EASTFORD AND UNION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING IS ISSUED FOR RAPID AND POTENTIALLY LIFE
THREATENING FLOODING. IN URBAN AREAS AVOID FLOODED ROADS AND OBEY
ROAD CLOSURES. THOSE NEAR SMALL STREAMS MUST HEAD FOR HIGHER GROUND
IMMEDIATELY.

&&

LAT...LON 4203 7236 4203 7214 4207 7213 4212 7178
      4201 7179 4200 7180 4195 7179 4182 7181
      4183 7227 4202 7246

$$

FRANK

1 follow-up statement

214 
WGUS71 KBOX 312142
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
542 PM EDT SUN MAY 31 2015

CTC013-312149-
/O.CAN.KBOX.FF.W.0002.000000T0000Z-150531T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TOLLAND CT-
542 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN TOLLAND COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES.

LAT...LON 4191 7217 4194 7213 4196 7212 4196 7210
      4202 7210 4204 7201 4212 7178 4201 7179
      4200 7180 4192 7179 4182 7181 4183 7216
      4184 7219

$$

CTC015-MAC027-312330-
/O.CON.KBOX.FF.W.0002.000000T0000Z-150531T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINDHAM CT-WORCESTER MA-
542 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR
NORTHERN WINDHAM AND SOUTH CENTRAL WORCESTER COUNTIES...

AT 539 PM EDT...DOPPLER RADAR INDICATED HEAVY RAIN AND EMBEDDED 
THUNDERSTORMS OCCURRING ACROSS THE WARNED AREA. UP TO THREE INCHES 
OF RAIN HAVE ALREADY FALLEN ACROSS PORTIONS OF NORTHERN WINDHAM 
COUNTY. THIS WILL RESULT IN LOCALIZED AREAS OF FLASH FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING IS ISSUED FOR RAPID AND POTENTIALLY LIFE
THREATENING FLOODING. IN URBAN AREAS AVOID FLOODED ROADS AND OBEY
ROAD CLOSURES. THOSE NEAR SMALL STREAMS MUST HEAD FOR HIGHER GROUND
IMMEDIATELY.

&&

LAT...LON 4191 7217 4194 7213 4196 7212 4196 7210
      4202 7210 4204 7201 4212 7178 4201 7179
      4200 7180 4192 7179 4182 7181 4183 7216
      4184 7219

$$

FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 1:55 PM EDT	Special Weather Statement	BOX		50 min
May 31, 2:20 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	55 min
May 31, 3:29 PM EDT	Flash Flood Watch	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	41 hr
May 31, 3:31 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	59 min
May 31, 4:08 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	67 min
May 31, 4:35 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	115 min
May 31, 5:03 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region	3 hr
May 31, 5:26 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	2 hr
May 31, 7:12 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	3 hr
May 31, 2:40 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex	65 min
May 31, 2:59 PM EDT	Areal Flood Advisory	BOX	Worcester	61 min
May 31, 3:14 PM EDT	Flash Flood Warning	BOX	Essex, Middlesex, Norfolk, Suffolk, Worcester	3 hr
May 31, 3:22 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Plymouth, Suffolk	53 min
May 31, 4:01 PM EDT	Areal Flood Advisory	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	119 min
May 31, 4:01 PM EDT	Small Craft Advisory	BOX		12 hr
May 31, 4:24 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	2 hr
May 31, 4:51 PM EDT	Flash Flood Warning	BOX	Bristol, Norfolk, Worcester	3 hr
May 31, 6:40 PM EDT	Areal Flood Advisory	BOX	Plymouth	2 hr
May 31, 7:56 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	2 hr

Nearby

Flash Flood Warnings in Connecticut, 2015 Flash Flood Warnings in Massachusetts, 2015 Every flash flood warning in 2015

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.