Alert archive / Connecticut / Flash Flood Warnings in 2021

Flash Flood Warning 27, NWS Albany, NY

August 19, 2021Northwest Hills Planning Region, Connecticut

NWS Albany, NY issued this flash flood warning at Aug 19, 2021, 7:02 AM EDT for Northwest Hills Planning Region, Connecticut. It was in force for 96 min. 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 19, 2021, 7:02 AM EDT (11:02 UTC)
Expired: Aug 19, 2021, 8:38 AM EDT
In force: 96 min
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

County Northwest Hills Planning Region, CT

The radar

The Brookhaven radar (KOKX), 84 km from the middle of the area, began a volume at 11:04 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

Brookhaven, NY (KOKX), launched 00:00Z, 11.0 hours before the alert went out and 84 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: 491 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

246 
WGUS51 KALY 191102
FFWALY
CTC005-191415-
/O.NEW.KALY.FF.W.0027.210819T1102Z-210819T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Albany NY
702 AM EDT Thu Aug 19 2021

The National Weather Service in Albany has issued a

* Flash Flood Warning for...
  Southeastern Litchfield County in northern Connecticut...

* Until 1015 AM EDT.

* At 702 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 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...
  Thomaston, Oakville, Terryville, Woodbury Center, Northwest 
  Harwinton, Watertown, Plymouth, Woodbury, Delano Field, Reynolds 
  Bridge, Northfield, Plymouth Green, Minortown, Bethlehem Village, 
  Hancock, Tolles, Hotchkissville, North Woodbury, Roraback Lodge 
  and Allentown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4151 7332 4180 7301 4164 7298 4163 7302
      4161 7302 4161 7306 4159 7306 4159 7308
      4157 7309 4156 7316 4151 7316

FLASH FLOOD...RADAR INDICATED

$$

SND

1 follow-up statement

864 
WGUS71 KALY 191238
FFSALY

Flash Flood Statement
National Weather Service Albany NY
838 AM EDT Thu Aug 19 2021

CTC005-191248-
/O.CAN.KALY.FF.W.0027.000000T0000Z-210819T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Litchfield CT-
838 AM EDT Thu Aug 19 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN LITCHFIELD 
COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4151 7332 4180 7301 4164 7298 4163 7302
      4161 7302 4161 7306 4159 7306 4159 7308
      4157 7309 4156 7316 4151 7316

$$

bew

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 5:39 AM EDT	Areal Flood Advisory	ALY	Northwest Hills Planning Region	3 hr

Nearby

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