Alert archive / Vermont / Flash Flood Warnings in 2021

Flash Flood Warning 23, NWS Albany, NY

July 29, 2021Bennington County, Windham County, Vermont; Rensselaer County, Washington County, New York

NWS Albany, NY issued this flash flood warning at Jul 29, 2021, 8:48 PM EDT for Bennington County, Windham County, Vermont; Rensselaer County, Washington County, New York. It was in force for 117 min. 7 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: Jul 29, 2021, 8:48 PM EDT (00:48 UTC)
Expired: Jul 29, 2021, 10:45 PM EDT
In force: 117 min
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

Counties Rensselaer County, NY, Washington County, NY, Bennington County, VT, Windham County, VT

The radar

The Albany radar (KENX), 124 km from the middle of the area, began a volume at 00:47 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.

What was reported inside it

Time	Report	Where	Remark
Jul 29, 9:00 PM EDT	FLASH FLOOD	2 Se Jamaica, VT	ROADWAY COLLAPSE ON RIVER RD. IN JAMAICA, VT.
Jul 29, 9:00 PM EDT	FLASH FLOOD	2 Wnw Arlington, VT	VERMONT ROUTE 313 CLOSED DUE TO FLOODING NEAR SANDGATE INTERSECTION. TIME ESTIMATED BY RADAR.
Jul 29, 9:00 PM EDT	FLASH FLOOD	3 Wnw Putney, VT	CULVERT COLLAPSE ON PUTNEY MOUNTAIN RD.
Jul 29, 9:05 PM EDT	FLASH FLOOD	Arlington, VT	MANY ROADWAYS FLOODED AND CLOSED.
Jul 29, 9:05 PM EDT	FLASH FLOOD	Manchester, VT	MANY ROADWAYS FLOODED AND CLOSED.
Jul 29, 9:15 PM EDT	HEAVY RAIN 3.57	3 Nne Arlington, VT	OCCURRED BETWEEN 4PM AND 915PM
Jul 29, 10:00 PM EDT	FLASH FLOOD	Putney, VT	INTERSTATE 91 NORTH AND SOUTH BETWEEN EXITS 4 AND 5 PARTIALLY CLOSED DUE TO FLOODING. TIME ESTIMATED BY RADAR.

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 102 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: 172 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 842 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 494 m²/s²
0-3 km storm-relative helicity: 635 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 8.8

Open this sounding in Storm Lab

The text

As transmitted.

977 
WGUS51 KALY 300048
FFWALY
NYC083-115-VTC003-025-300245-
/O.NEW.KALY.FF.W.0023.210730T0048Z-210730T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Albany NY
848 PM EDT Thu Jul 29 2021

The National Weather Service in Albany has issued a

* Flash Flood Warning for...
  Northeastern Rensselaer County in east central New York...
  Southeastern Washington County in east central New York...
  Central Bennington County in southern Vermont...
  Central Windham County in southern Vermont...

* Until 1045 PM EDT.

* At 848 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 0.5 to 2 inches in 2 
  hours. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Bellows Falls, Arlington, Townshend, Salem, Manchester, Stratton, 
  Shaftsbury, Putney, Cambridge, Saxtons River, Westminster, 
  Newfane, West Wardsboro, Manchester Center, White Creek, North 
  Bennington, Dover, Jamaica, Sunderland and Wardsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4291 7345 4319 7338 4316 7245 4315 7246
      4312 7243 4310 7244 4308 7244 4305 7247
      4303 7246 4301 7244 4300 7246 4298 7246
      4297 7247 4295 7253 4292 7252 4290 7253
      4288 7255 4287 7256 4293 7308

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-2 INCHES IN 2 HOURS

$$

MSE

1 follow-up statement

193 
WGUS71 KALY 300244
FFSALY

Flash Flood Statement
National Weather Service Albany NY
1044 PM EDT Thu Jul 29 2021

NYC083-115-VTC003-025-300254-
/O.EXP.KALY.FF.W.0023.000000T0000Z-210730T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rensselaer NY-Washington NY-Bennington VT-Windham VT-
1044 PM EDT Thu Jul 29 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM EDT THIS EVENING FOR 
NORTHEASTERN RENSSELAER, SOUTHEASTERN WASHINGTON, CENTRAL BENNINGTON 
AND CENTRAL WINDHAM COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed any remaining road closures and 
watch out for residual ponding of water.

LAT...LON 4291 7345 4319 7338 4316 7245 4315 7246
      4312 7243 4310 7244 4308 7244 4305 7247
      4303 7246 4301 7244 4300 7246 4298 7246
      4297 7247 4295 7253 4292 7252 4290 7253
      4288 7255 4287 7256 4293 7308

$$

JPV

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:03 PM EDT	Severe Thunderstorm Warning	ALY	Bennington	57 min
Jul 29, 9:57 PM EDT	River Flood Warning	ALY	Windham	6 hr
Jul 29, 11:06 PM EDT	River Flood Warning	ALY	Windham	5 hr
Jul 29, 9:10 PM EDT	Severe Thunderstorm Warning	ALY	Rensselaer	45 min
Jul 29, 11:13 PM EDT	Areal Flood Advisory	ALY	Columbia	90 min
Jul 30, 12:42 AM EDT	River Flood Warning	ALY	Washington	4 hr
Jul 30, 3:49 AM EDT	Special Weather Statement	ALY	Hamilton, Herkimer	41 min
Jul 30, 4:35 AM EDT	Special Weather Statement	ALY	Hamilton, Herkimer	40 min

Nearby

Flash Flood Warnings in Vermont, 2021 Flash Flood Warnings in New York, 2021 Every flash flood warning in 2021

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.