Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 5, NWS Albany, NY

May 20, 20114 counties in New York; Northwest Hills Planning Region, Connecticut; Berkshire County, Massachusetts

NWS Albany, NY issued this flash flood warning at May 20, 2011, 2:18 PM EDT for 4 counties in New York; Northwest Hills Planning Region, Connecticut; Berkshire County, Massachusetts. It was in force for 6 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 20, 2011, 2:18 PM EDT (18:18 UTC)
Expired
May 20, 2011, 8:05 PM EDT
In force
6 hr
Issued by
NWS Albany, NY
Area
Storm-based polygon
Flood severity
None

Counties Northwest Hills Planning Region, CT, Berkshire County, MA, Columbia County, NY, Dutchess County, NY, Greene County, NY, Ulster County, NY

The radar

The Albany radar (KENX), 65 km from the middle of the area, began a volume at 18:19 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.

What was reported inside it

TimeReportWhereRemark
May 20, 3:17 PM EDTFLASH FLOODMillbrook, NYROUTE 44 FLOODED IN SEVERAL PLACES BETWEEN MILLBROOK AND AMENIA.
May 20, 3:50 PM EDTFLASH FLOODCoxsackie, NYMANSION ST. CLOSED BETWEEN BAILEY ST. AND LAWRENCE AVE DUE TO FLOODING
May 20, 3:58 PM EDTFLASH FLOODClaverack, NYFLOODING OF RT. 217 NORTH OF ROUTE 23
May 20, 4:13 PM EDTFLASH FLOODHillsdale, NYSR 23 FLOODED IN HILLSDALE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 6.3 hours before the alert went out and 70 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 2011-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 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 2011-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
135 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
654 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

210 
WGUS51 KALY 201818
FFWALY
CTC005-MAC003-NYC021-027-039-111-210015-
/O.NEW.KALY.FF.W.0005.110520T1818Z-110521T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ALBANY NY
218 PM EDT FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN ALBANY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COLUMBIA COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITY OF HUDSON...
  NORTHERN DUTCHESS COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITY OF RHINEBECK...
  SOUTHEASTERN GREENE COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITY OF CATSKILL...
  NORTHEASTERN ULSTER COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITIES OF...SAUGERTIES...KINGSTON...
  NORTHWESTERN LITCHFIELD COUNTY IN NORTHERN CONNECTICUT...
  SOUTHWESTERN BERKSHIRE COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREAT BARRINGTON...

* UNTIL 815 PM EDT

* AT 214 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM THUNDERSTORMS WHICH IS EXPECTED TO PRODUCE    
  FLASH FLOODING OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HIGH
  FALLS...SHARON...SHEFFIELD...HOUSATONIC...STANFORDVILLE...RED
  HOOK...PORT EWEN...PINE PLAINS...PHILMONT...MILLERTON...
  LIVINGSTON...LAKE KATRINE...COXSACKIE...COPAKE...CLERMONT...
  CLAVERACK...ATHENS AND ANCRAM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY EMAIL AT
ALB.STORMREPORT@NOAA.GOV.

&&

LAT...LON 4203 7336 4172 7342 4173 7404 4200 7404
      4219 7400 4238 7386 4236 7365 4224 7330

$$
2 follow-up statements
571 
WGUS71 KALY 202020
FFSALY

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ALBANY NY
420 PM EDT FRI MAY 20 2011

CTC005-MAC003-NYC021-027-039-111-210015-
/O.CON.KALY.FF.W.0005.000000T0000Z-110521T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LITCHFIELD CT-BERKSHIRE MA-GREENE NY-ULSTER NY-DUTCHESS NY-
COLUMBIA NY-
420 PM EDT FRI MAY 20 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR
COLUMBIA...NORTHERN DUTCHESS...NORTHEASTERN ULSTER...SOUTHEASTERN
GREENE...SOUTHWESTERN BERKSHIRE AND NORTHWESTERN LITCHFIELD
COUNTIES...

AT 417 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE WARNED 
AREA. ROUTE 9J HAS BEEN FLOODED IN THE TOWN OF STUYVESANT AS WELL AS 
ROUTE 217 IN CLAVERACK.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HIGH FALLS...
SHEFFIELD...HOUSATONIC...GREAT BARRINGTON...PHILMONT...LIVINGSTON...
HUDSON...COXSACKIE...COPAKE...CLERMONT...CLAVERACK...CATSKILL AND
ATHENS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY EMAIL AT
ALB.STORMREPORT@NOAA.GOV.

&&

LAT...LON 4203 7336 4172 7342 4173 7404 4200 7404
      4219 7400 4238 7386 4236 7365 4224 7330

$$
483 
WGUS71 KALY 210005
FFSALY

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ALBANY NY
805 PM EDT FRI MAY 20 2011

CTC005-MAC003-NYC021-027-039-111-210014-
/O.CAN.KALY.FF.W.0005.000000T0000Z-110521T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LITCHFIELD CT-BERKSHIRE MA-GREENE NY-ULSTER NY-DUTCHESS NY-
COLUMBIA NY-
805 PM EDT FRI MAY 20 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR COLUMBIA...NORTHERN
DUTCHESS...NORTHEASTERN ULSTER...SOUTHEASTERN GREENE...SOUTHWESTERN
BERKSHIRE AND NORTHWESTERN LITCHFIELD COUNTIES...

THE THUNDERSTORMS WHICH PRODUCED HEAVY RAIN THIS AFTERNOON HAVE 
MOVED WEST OF THE AREA. THUS THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY EMAIL AT
ALB.STORMREPORT@NOAA.GOV.

LAT...LON 4203 7336 4172 7342 4173 7404 4200 7404
      4219 7400 4238 7386 4236 7365 4224 7330

$$

The office that day

Everything else NWS Albany, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 8:47 PM EDTFlash Flood WarningALYColumbia, Greene6 hr
May 19, 9:52 PM EDTRiver Flood WarningALYOneida11 hr
May 20, 1:16 PM EDTAreal Flood AdvisoryALYColumbia, Dutchess60 min
May 20, 2:35 PM EDTFlash Flood WarningALYRensselaer, Saratoga, Warren, Washington2 hr
May 20, 2:47 PM EDTSevere Thunderstorm WarningALYColumbia, Greene43 min
May 20, 3:16 PM EDTSevere Thunderstorm WarningALYSaratoga, Warren, Washington44 min
May 20, 3:46 PM EDTFlash Flood WarningALYAlbany, Columbia, Greene, Rensselaer, Saratoga, Schenectady5 hr
May 20, 4:03 PM EDTFlash Flood WarningALYFulton, Hamilton, Herkimer, Montgomery6 hr
May 20, 5:02 PM EDTSpecial Weather StatementALYPutnam28 min
May 20, 5:23 PM EDTFlash Flood WarningALYDutchess, Ulster3 hr
May 20, 5:39 PM EDTSpecial Weather StatementALYWashington66 min
May 20, 6:59 PM EDTFlash Flood WarningALYRensselaer, Saratoga, Schenectady, Washington3 hr

Nearby

Flash Flood Warnings in New York, 2011Flash Flood Warnings in Connecticut, 2011Flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.