Alert archive / Rhode Island / Flash Flood Warnings in 2011

Flash Flood Warning 1, NWS Boston/Norton, MA

May 20, 2011Northeastern Connecticut Planning Region, Connecticut; Kent County, Providence County, Rhode Island

NWS Boston/Norton, MA issued this flash flood warning at May 20, 2011, 5:02 PM EDT for Northeastern Connecticut Planning Region, Connecticut; Kent County, Providence County, Rhode Island. It was in force for 51 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: May 20, 2011, 5:02 PM EDT (21:02 UTC)
Expired: May 20, 2011, 5:53 PM EDT
In force: 51 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Northeastern Connecticut Planning Region, CT, Kent County, RI, Providence County, RI

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.0 hours before the alert went out and 123 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: 49 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 2 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.

465 
WGUS51 KBOX 202102
FFWBOX
CTC015-RIC003-007-202300-
/O.NEW.KBOX.FF.W.0001.110520T2102Z-110520T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY
502 PM EDT FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN KENT COUNTY IN RHODE ISLAND...
  SOUTHWESTERN PROVIDENCE COUNTY IN RHODE ISLAND...
  SOUTHEASTERN WINDHAM COUNTY IN NORTHERN CONNECTICUT...

* UNTIL 700 PM EDT...

* AT 458 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 4164 7180 4164 7189 4163 7193 4163 7197
      4164 7200 4179 7200 4181 7164 4161 7162
      4160 7180

$$

NV

1 follow-up statement

129 
WGUS71 KBOX 202153
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY
553 PM EDT FRI MAY 20 2011

CTC015-RIC003-007-202201-
/O.CAN.KBOX.FF.W.0001.000000T0000Z-110520T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINDHAM CT-PROVIDENCE RI-KENT RI-
553 PM EDT FRI MAY 20 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN KENT...
SOUTHWESTERN PROVIDENCE AND SOUTHEASTERN WINDHAM COUNTIES...

THE WARNING HAS BEEN CANCELLED AS THE HEAVIEST RAIN HAS MOVED 
NORTHWEST OF THE REGION. BETWEEN 1 AND 3 INCHES OF RAIN FELL ACROSS 
PORTIONS OF THE REGION. MOTORISTS ARE ADVISED THAT SOME RESIDUAL 
MINOR URBAN...POOR DRAINAGE...AND SMALL STREAM FLOODING MAY STILL 
REMAIN.

LAT...LON 4164 7180 4164 7189 4163 7193 4163 7197
      4164 7200 4179 7200 4181 7164 4161 7162
      4160 7180

$$

NV

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 4:21 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	97 min
May 20, 4:37 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	66 min
May 20, 4:56 PM EDT	Special Weather Statement	BOX		64 min
May 20, 4:58 PM EDT	Special Weather Statement	BOX		62 min
May 20, 5:50 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	85 min
May 20, 12:21 AM EDT	Areal Flood Advisory	BOX	Bristol, Kent, Newport, Washington	119 min
May 20, 5:04 AM EDT	Dense Fog Advisory	BOX	Bristol, Kent, Newport, Providence, Washington	4 hr

Nearby

Flash Flood Warnings in Rhode Island, 2011 Flash Flood Warnings in Connecticut, 2011 Every 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.