Alert archive / Massachusetts / Flash Flood Warnings in 2021

Flash Flood Warning 20, NWS Albany, NY

July 18, 2021Berkshire County, Massachusetts

NWS Albany, NY issued this flash flood warning at Jul 18, 2021, 6:42 PM EDT for Berkshire County, Massachusetts. It was in force for 3 hr. 4 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 18, 2021, 6:42 PM EDT (22:42 UTC)
Expired: Jul 18, 2021, 9:30 PM EDT
In force: 3 hr
Issued by: NWS Albany, NY
Area: Storm-based polygon
Flood severity: None

County Berkshire County, MA

The radar

The Albany radar (KENX), 91 km from the middle of the area, began a volume at 22:42 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 18, 8:45 PM EDT	FLASH FLOOD	Becket, MA	LEONHART ROAD FLOODED.
Jul 18, 8:45 PM EDT	FLASH FLOOD	Otis, MA	WARDEN ROAD FLOODED NEAR THE EGG FARM.
Jul 18, 8:45 PM EDT	FLASH FLOOD	Otis, MA	WERDEN ROAD FLOODED NEAR THE EGG FARM.
Jul 18, 8:45 PM EDT	FLASH FLOOD	Otis, MA	WEST CENTER ROAD FLOODED WITH SOME ROCKS AND DEBRIS LEFT BEHIND FROM RECEDING WATER.

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 12:00Z, 10.7 hours before the alert went out and 81 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.

517 
WGUS51 KALY 182242
FFWALY
MAC003-190130-
/O.NEW.KALY.FF.W.0020.210718T2242Z-210719T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Albany has issued a

* Flash Flood Warning for...
  Southeastern Berkshire County in western Massachusetts...

* Until 930 PM EDT.

* At 642 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1 inch of rain 
  has fallen. The expected rainfall rate is 1 to 3 inches in 1 hour. 
  Additional rainfall amounts of 1 to 3 inches 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...
  Becket, Otis, Sandisfield, Otis Wood Lanes, North Otis, Cold 
  Spring, East Otis, Algerie Four Corners, Montville, Bonny Rigg 
  Corners, West New Boston, Becket Center, New Boston, Roosterville, 
  Konkapot, South Sandisfield, Free Quarter and Gomorrah.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

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 4239 7307 4238 7304 4238 7301 4233 7306
      4231 7303 4231 7301 4231 7300 4225 7300
      4214 7303 4215 7307 4212 7306 4211 7307
      4209 7307 4206 7305 4204 7305 4205 7329
      4213 7315 4239 7310

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR

$$

ATE

2 follow-up statements

538 
WGUS71 KALY 190108
FFSALY

Flash Flood Statement
National Weather Service Albany NY
908 PM EDT Sun Jul 18 2021

MAC003-190130-
/O.CON.KALY.FF.W.0020.000000T0000Z-210719T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkshire MA-
908 PM EDT Sun Jul 18 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS 
EVENING FOR SOUTHEASTERN BERKSHIRE COUNTY...

At 908 PM EDT, local law enforcement reported flooding on roads in 
Otis and Becket. Between 1 and 3 inches of rain have fallen. Flash 
flooding is already occurring. Rain has ended and water will 
continue to run off into streams and creeks.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  Becket, Otis, Sandisfield, Otis Wood Lanes, North Otis, Cold 
  Spring, East Otis, Algerie Four Corners, Montville, Bonny Rigg 
  Corners, West New Boston, Becket Center, New Boston, Roosterville, 
  Konkapot, South Sandisfield, Free Quarter and Gomorrah.

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.

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 4239 7307 4238 7304 4238 7301 4233 7306
      4231 7303 4231 7301 4231 7300 4225 7300
      4214 7303 4215 7307 4212 7306 4211 7307
      4209 7307 4206 7305 4204 7305 4205 7329
      4213 7315 4239 7310

FLASH FLOOD...OBSERVED

$$

NAS

830 
WGUS71 KALY 190128
FFSALY

Flash Flood Statement
National Weather Service Albany NY
928 PM EDT Sun Jul 18 2021

MAC003-190138-
/O.EXP.KALY.FF.W.0020.000000T0000Z-210719T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berkshire MA-
928 PM EDT Sun Jul 18 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM EDT THIS EVENING FOR 
SOUTHEASTERN BERKSHIRE COUNTY...

The heavy rain has ended. Water is in the process of receding. 
Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM EDT for portions 
of northwestern Connecticut, western Massachusetts, east central New 
York and southern Vermont.

LAT...LON 4239 7307 4238 7304 4238 7301 4233 7306
      4231 7303 4231 7301 4231 7300 4225 7300
      4214 7303 4215 7307 4212 7306 4211 7307
      4209 7307 4206 7305 4204 7305 4205 7329
      4213 7315 4239 7310

$$

NAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 9:23 PM EDT	Areal Flood Advisory	ALY	Berkshire	3 hr
Jul 17, 10:03 PM EDT	Areal Flood Advisory	ALY	Berkshire	117 min
Jul 18, 3:59 PM EDT	Areal Flood Advisory	ALY	Berkshire	3 hr
Jul 18, 4:49 PM EDT	Flash Flood Warning	ALY	Berkshire	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

Nearby

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.