Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 4, NWS Albany, NY

May 19, 2011Columbia County, Greene County, New York

NWS Albany, NY issued this flash flood warning at May 19, 2011, 8:47 PM EDT for Columbia County, Greene County, New York. It was in force for 6 hr. 3 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 19, 2011, 8:47 PM EDT (00:47 UTC)
Expired: May 20, 2011, 2:45 AM EDT
In force: 6 hr
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

Counties Columbia County, NY, Greene County, NY

The radar

The Albany radar (KENX), 42 km from the middle of the area, began a volume at 00:49 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

Time	Report	Where	Remark
May 19, 10:40 PM EDT	FLASH FLOOD	Stockport, NY	STATE ROUTE 9 WATER OVER THE ROAD NEAR THE COLUMBIAVILLE BRIDGE.
May 19, 11:00 PM EDT	FLASH FLOOD	Greenport Center, NY	FAIRVIEW AVENUE NEAR ROUTE 9 FLOODED AND CLOSED.
May 20, 1:30 AM EDT	FLASH FLOOD	Claverack, NY	INTERSECTION OF STATE ROUTES 9H AND 66 FLOODED AND CLOSED.

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 00:00Z, 0.8 hours before the alert went out and 56 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: 303 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 932 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

997 
WGUS51 KALY 200047
FFWALY
NYC021-039-200645-
/O.NEW.KALY.FF.W.0004.110520T0047Z-110520T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ALBANY NY
847 PM EDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN ALBANY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COLUMBIA COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITIES OF...HUDSON...CHATHAM...
  GREENE COUNTY IN EAST CENTRAL NEW YORK...
  THIS INCLUDES THE CITIES OF...HUNTER...CATSKILL...

* UNTIL 245 AM EDT

* AT 844 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  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 WINDHAM...
  NEW BALTIMORE...VALATIE...PRATTSVILLE...NEW LEBANON...KINDERHOOK...
  COXSACKIE AND AUSTERLITZ

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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

&&

LAT...LON 4235 7443 4235 7426 4240 7423 4250 7336
      4198 7354 4201 7370 4209 7391 4215 7391
      4218 7399 4217 7404 4211 7408 4212 7427
      4220 7454

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 9:52 PM EDT	River Flood Warning	ALY	Oneida	11 hr
May 20, 1:16 PM EDT	Areal Flood Advisory	ALY	Columbia, Dutchess	60 min
May 20, 2:18 PM EDT	Flash Flood Warning	ALY	Columbia, Dutchess, Greene, Ulster	6 hr
May 20, 2:35 PM EDT	Flash Flood Warning	ALY	Rensselaer, Saratoga, Warren, Washington	2 hr
May 20, 2:47 PM EDT	Severe Thunderstorm Warning	ALY	Columbia, Greene	43 min
May 20, 3:16 PM EDT	Severe Thunderstorm Warning	ALY	Saratoga, Warren, Washington	44 min
May 20, 3:46 PM EDT	Flash Flood Warning	ALY	Albany, Columbia, Greene, Rensselaer, Saratoga, Schenectady	5 hr
May 20, 4:03 PM EDT	Flash Flood Warning	ALY	Fulton, Hamilton, Herkimer, Montgomery	6 hr
May 20, 5:02 PM EDT	Special Weather Statement	ALY	Putnam	28 min
May 20, 5:23 PM EDT	Flash Flood Warning	ALY	Dutchess, Ulster	3 hr
May 20, 5:39 PM EDT	Special Weather Statement	ALY	Washington	66 min
May 20, 6:59 PM EDT	Flash Flood Warning	ALY	Rensselaer, Saratoga, Schenectady, Washington	3 hr

Nearby

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