Alert archive / Vermont / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS Albany, NY

August 1, 2021Windham County, Vermont

NWS Albany, NY issued this flash flood warning at Aug 1, 2021, 6:15 PM EDT for Windham County, Vermont. It was in force for 3 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
Aug 1, 2021, 6:15 PM EDT (22:15 UTC)
Expired
Aug 1, 2021, 9:15 PM EDT
In force
3 hr
Issued by
NWS Albany, NY
Area
Storm-based polygon
Flood severity
None

County Windham County, VT

The radar

The Albany radar (KENX), 141 km from the middle of the area, began a volume at 22:18 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, 10.3 hours before the alert went out and 119 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 2021-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1357 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

068 
WGUS51 KALY 012215
FFWALY
VTC025-020115-
/O.NEW.KALY.FF.W.0025.210801T2215Z-210802T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Albany NY
615 PM EDT Sun Aug 1 2021

The National Weather Service in Albany has issued a

* Flash Flood Warning for...
  Northeastern Windham County in southern Vermont...

* Until 915 PM EDT.

* At 615 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
  possible in the warned area. 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, Saxtons River, Windham, Rockingham, Grafton, 
  Athens, North Westminster, Cambridgeport, Houghtonville, 
  Bartonsville, Brockways Mills, South Windham, Lawrence Four 
  Corners and West Townshend.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to the National Weather Service by email 
atALB.stormreport@noaa.gov... On Facebook at 
www.facebook.com/nwsalbany or twitter @nwsalbany.

&&

LAT...LON 4319 7278 4323 7271 4322 7269 4324 7255
      4323 7243 4322 7244 4320 7244 4319 7245
      4318 7244 4317 7245 4315 7245 4315 7246
      4314 7245 4314 7244 4313 7244 4312 7244
      4308 7272

FLASH FLOOD...RADAR INDICATED

$$

Rathbun

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 3:18 AM EDTFlash Flood WatchALYBennington, Windham19 hr
Aug 1, 5:17 PM EDTSpecial Weather StatementALYWindham28 min
Aug 1, 5:24 PM EDTAreal Flood AdvisoryALYBennington, Windham3 hr
Aug 1, 5:40 PM EDTFlash Flood WarningALYBennington, Windham3 hr
Aug 1, 5:53 PM EDTSpecial Weather StatementALYWindham37 min

Nearby

Flash Flood Warnings in Vermont, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.