Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 7, NWS Albany, NY

May 20, 20116 counties in New York

NWS Albany, NY issued this flash flood warning at May 20, 2011, 3:46 PM EDT for 6 counties in New York. It was in force for 5 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 20, 2011, 3:46 PM EDT (19:46 UTC)
Expired
May 20, 2011, 8:46 PM EDT
In force
5 hr
Issued by
NWS Albany, NY
Area
Storm-based polygon
Flood severity
None

Counties Albany County, NY, Columbia County, NY, Greene County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY

The radar

The Albany radar (KENX), 33 km from the middle of the area, began a volume at 19:47 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, 7.8 hours before the alert went out and 23 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.

847 
WGUS51 KALY 201946
FFWALY
NYC001-021-039-083-091-093-210145-
/O.NEW.KALY.FF.W.0007.110520T1946Z-110521T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN ALBANY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN ALBANY COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITIES OF...WATERVLIET...LATHAM...DELMAR...
  COLONIE...COHOES...ALBANY...
  NORTHERN COLUMBIA COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITY OF CHATHAM...
  NORTHEASTERN GREENE COUNTY IN EAST CENTRAL NEW YORK...
  RENSSELAER COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITIES OF...TROY...RENSSELAER...NASSAU...EAST
  GREENBUSH...
  EXTREME SOUTH CENTRAL SARATOGA COUNTY IN EAST CENTRAL NEW YORK...
  EXTREME EAST CENTRAL SCHENECTADY COUNTY IN EAST CENTRAL NEW YORK...

* UNTIL 945 PM EDT

* AT 342 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THUNDERSTORMS WITH VERY HEAVY RAIN EXPECTED TO PRODUCE FLASH       
  FLOODING OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CENTER
  BRUNSWICK...WYANTSKILL...WYNANTSKILL...WEST SAND LAKE...
  WATERFORD...VOORHEESVILLE...STEPHENTOWN...SELKIRK...MENANDS...
  LOUDONVILLE...GUILDERLAND...GREEN ISLAND...GRAFTON...FEURA BUSH...
  CASTLETON-ON-HUDSON...BERLIN AND AVERILL PARK

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 4282 7385 4284 7329 4269 7329 4252 7336
      4229 7344 4236 7365 4238 7385 4220 7399
      4225 7420

$$
1 follow-up statement
851 
WGUS71 KALY 210046
FFSALY

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

NYC001-021-039-083-091-093-210056-
/O.CAN.KALY.FF.W.0007.000000T0000Z-110521T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SCHENECTADY NY-ALBANY NY-GREENE NY-COLUMBIA NY-RENSSELAER NY-
SARATOGA NY-
846 PM EDT FRI MAY 20 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTH
CENTRAL SARATOGA...RENSSELAER...NORTHERN COLUMBIA...NORTHEASTERN
GREENE...EASTERN ALBANY AND EXTREME EAST CENTRAL SCHENECTADY
COUNTIES...

THE THUNDERSTORMS WHICH PRODUCED VERY HEAVY RAIN ACROSS PARTS OF THE 
WARNED AREA HAVE MOVED OUT OF THE REGION. THEREFORE THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED.

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

LAT...LON 4282 7385 4284 7329 4269 7329 4252 7336
      4229 7344 4236 7365 4238 7385 4220 7399
      4225 7420

$$

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, 2:18 PM EDTFlash Flood WarningALYColumbia, Dutchess, Greene, Ulster6 hr
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, 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, 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.