Alert archive / Connecticut / Flash Flood Warnings in 2023

Flash Flood Warning 21, NWS Albany, NY

July 16, 2023Northwest Hills Planning Region, Connecticut

NWS Albany, NY issued this flash flood warning at Jul 16, 2023, 8:22 AM EDT for Northwest Hills Planning Region, Connecticut. It was in force for 2 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: Jul 16, 2023, 8:22 AM EDT (12:22 UTC)
Expired: Jul 16, 2023, 10:24 AM EDT
In force: 2 hr
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

County Northwest Hills Planning Region, CT

The radar

The Brookhaven radar (KOKX), 95 km from the middle of the area, began a volume at 12:25 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 16, 9:03 AM EDT	FLASH FLOOD	Torrington, CT	Video shared via Twitter of flooded roadway in Torrington
Jul 16, 9:45 AM EDT	RAIN 2.61	Woodbury, CT
Jul 16, 10:00 AM EDT	RAIN 2.32	Colebrook, CT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 0.4 hours before the alert went out and 95 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: 236 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted.

848 
WGUS51 KALY 161222
FFWALY
CTC005-161530-
/O.NEW.KALY.FF.W.0021.230716T1222Z-230716T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Albany NY
822 AM EDT Sun Jul 16 2023

The National Weather Service in Albany has issued a

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

* Until 1130 AM EDT.

* At 822 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Torrington, New Milford, Thomaston, New Hartford, Norfolk, 
  Litchfield, Northwest Harwinton, New Preston, Terryville, 
  Oakville, Winsted, Woodbury Center, New Hartford Center, 
  Watertown, Plymouth, Woodbury, Harwinton, Barkhamsted, Bethlehem 
  and Washington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4158 7347 4204 7323 4204 7301 4197 7303
      4197 7289 4190 7292 4189 7294 4181 7295
      4180 7302 4164 7298 4161 7306 4157 7309
      4156 7316 4151 7316 4151 7332 4149 7333
      4147 7331 4149 7337 4151 7339 4149 7344

FLASH FLOOD...RADAR INDICATED

$$

CS

1 follow-up statement

330 
WGUS71 KALY 161424
FFSALY

Flash Flood Statement
National Weather Service Albany NY
1024 AM EDT Sun Jul 16 2023

CTC005-161434-
/O.CAN.KALY.FF.W.0021.000000T0000Z-230716T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Litchfield CT-
1024 AM EDT Sun Jul 16 2023

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

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 200 AM EDT Monday for portions 
of northwestern Connecticut, western Massachusetts and New York.

LAT...LON 4158 7347 4204 7323 4204 7301 4197 7303
      4197 7289 4190 7292 4189 7294 4181 7295
      4180 7302 4164 7298 4161 7306 4157 7309
      4156 7316 4151 7316 4151 7332 4149 7333
      4147 7331 4149 7337 4151 7339 4149 7344

$$

CS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 7:21 AM EDT	Special Weather Statement	ALY		24 min
Jul 16, 7:41 AM EDT	Areal Flood Advisory	ALY	Northwest Hills Planning Region	2 hr
Jul 16, 8:08 AM EDT	Special Weather Statement	ALY		37 min
Jul 16, 8:53 AM EDT	River Flood Warning	ALY	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	39 hr
Jul 16, 9:39 AM EDT	River Flood Warning	ALY	Greater Bridgeport Planning Region, Northwest Hills Planning Region	32 hr
Jul 16, 9:59 AM EDT	River Flood Warning	ALY	Northwest Hills Planning Region	4 hr
Jul 16, 10:42 AM EDT	River Flood Warning	ALY	Northwest Hills Planning Region	17 hr
Jul 16, 10:46 AM EDT	River Flood Warning	ALY	Northwest Hills Planning Region	11 hr
Jul 16, 12:23 PM EDT	Areal Flood Advisory	ALY	Northwest Hills Planning Region	104 min

Nearby

Flash Flood Warnings in Connecticut, 2023 Every flash flood warning in 2023

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.