Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 18, NWS Albany, NY

July 18, 2021Columbia County, New York; Berkshire County, Massachusetts

NWS Albany, NY issued this flash flood warning at Jul 18, 2021, 4:49 PM EDT for Columbia County, New York; Berkshire County, Massachusetts. 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: Jul 18, 2021, 4:49 PM EDT (20:49 UTC)
Expired: Jul 18, 2021, 8:00 PM EDT
In force: 3 hr
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

Counties Berkshire County, MA, Columbia County, NY

The radar

The Albany radar (KENX), 61 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 54 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: 4 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

315 
WGUS51 KALY 182049
FFWALY
MAC003-NYC021-190000-
/O.NEW.KALY.FF.W.0018.210718T2049Z-210719T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Albany NY
449 PM EDT Sun Jul 18 2021

The National Weather Service in Albany has issued a

* Flash Flood Warning for...
  West Central Berkshire County in western Massachusetts...
  Northeastern Columbia County in east central New York...

* Until 800 PM EDT.

* At 449 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. 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...
  West Stockbridge Center.

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 4225 7346 4229 7346 4235 7344 4235 7342
      4235 7341 4232 7338 4228 7338

FLASH FLOOD...RADAR INDICATED

$$

ATE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:04 PM EDT	Special Weather Statement	ALY	Dutchess	26 min
Jul 17, 8:12 PM EDT	Flash Flood Warning	ALY	Dutchess	3 hr
Jul 17, 8:32 PM EDT	Special Weather Statement	ALY	Dutchess	28 min
Jul 17, 8:40 PM EDT	Severe Thunderstorm Warning	ALY	Dutchess	65 min
Jul 17, 8:48 PM EDT	Special Weather Statement	ALY	Ulster	27 min
Jul 17, 8:57 PM EDT	Areal Flood Advisory	ALY	Columbia	3 hr
Jul 17, 9:23 PM EDT	Areal Flood Advisory	ALY	Rensselaer	3 hr
Jul 17, 10:03 PM EDT	Areal Flood Advisory	ALY	Columbia, Dutchess	117 min
Jul 17, 10:35 PM EDT	Areal Flood Advisory	ALY	Albany, Rensselaer, Saratoga, Schenectady	115 min
Jul 17, 11:18 PM EDT	Areal Flood Advisory	ALY	Dutchess	117 min
Jul 18, 5:29 AM EDT	Areal Flood Advisory	ALY	Herkimer	96 min
Jul 18, 3:59 PM EDT	Areal Flood Advisory	ALY	Columbia	3 hr
Jul 18, 4:06 PM EDT	Areal Flood Advisory	ALY	Greene, Schoharie	6 hr
Jul 18, 5:27 PM EDT	Areal Flood Advisory	ALY	Columbia	3 hr
Jul 18, 5:58 PM EDT	Special Weather Statement	ALY	Berkshire	62 min
Jul 18, 6:13 PM EDT	Areal Flood Advisory	ALY	Berkshire	3 hr
Jul 18, 6:23 PM EDT	Flash Flood Warning	ALY	Berkshire	3 hr
Jul 18, 6:42 PM EDT	Flash Flood Warning	ALY	Berkshire	3 hr

Nearby

Flash Flood Warnings in New York, 2021 Flash Flood Warnings in Massachusetts, 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.