Alert archive / Pennsylvania / Flash Flood Warnings in 2021

Flash Flood Warning 43, NWS Binghamton, NY

July 20, 2021Bradford County, Pennsylvania; Chemung County, New York

NWS Binghamton, NY issued this flash flood warning at Jul 20, 2021, 10:54 PM EDT for Bradford County, Pennsylvania; Chemung County, New York. 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 20, 2021, 10:54 PM EDT (02:54 UTC)
Expired: Jul 21, 2021, 1:42 AM EDT
In force: 3 hr
Issued by: NWS Binghamton, NY
Area: Storm-based polygon
Flood severity: None

Counties Chemung County, NY, Bradford County, PA

The radar

The Binghamton radar (KBGM), 55 km from the middle of the area, began a volume at 02:54 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

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.9 hours before the alert went out and 202 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1459 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -176 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

581 
WGUS51 KBGM 210254
FFWBGM
NYC015-PAC015-210600-
/O.NEW.KBGM.FF.W.0043.210721T0254Z-210721T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Binghamton NY
1054 PM EDT Tue Jul 20 2021

The National Weather Service in Binghamton has issued a

* Flash Flood Warning for...
  Southern Chemung County in central New York...
  Northern Bradford County in northeastern Pennsylvania...

* Until 200 AM EDT.

* At 1054 PM EDT, Doppler radar indicated a cluster of thunderstorms 
  producing heavy rain across the warned area. Between 1.5 and 2.5 
  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...
  Chemung, Elmira, Sayre, Waverly, Athens, West Elmira, Southport, 
  Ridgebury, Ulster, Litchfield, Springfield, South Waverly, 
  Windham, Wellsburg, Rome, Le Raysville, Sylvania, Milan, East 
  Smithfield and Wetona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to higher ground now. Act quickly to protect your life.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4211 7692 4211 7655 4200 7656 4200 7615
      4185 7613 4179 7687

FLASH FLOOD...RADAR INDICATED

$$

Kistner

2 follow-up statements

985 
WGUS71 KBGM 210408
FFSBGM

Flash Flood Statement
National Weather Service Binghamton NY
1208 AM EDT Wed Jul 21 2021

PAC015-210418-
/O.CAN.KBGM.FF.W.0043.000000T0000Z-210721T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bradford PA-
1208 AM EDT Wed Jul 21 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN BRADFORD COUNTY...

Flooding is no longer expected to pose a threat. 

LAT...LON 4211 7692 4211 7655 4209 7655 4202 7656
      4201 7656 4200 7656 4200 7657 4200 7662
      4200 7664 4200 7675 4200 7681 4200 7682
      4200 7687 4200 7690

$$

NYC015-210600-
/O.CON.KBGM.FF.W.0043.000000T0000Z-210721T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chemung NY-
1208 AM EDT Wed Jul 21 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM EDT EARLY THIS 
MORNING FOR SOUTHERN CHEMUNG COUNTY...

At 1208 AM EDT, Doppler radar another thunderstorm producing heavy 
rain about to move warned area. Between 2.5 and 3 inches of rain has 
already fallen from earlier storms. 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...
  Chemung, Elmira, West Elmira, Southport, Wellsburg, Lowman, Pine 
  City, Lockwood, Newtown Battlefield State Park, Owens Mill, Webb 
  Mills and Seely Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to higher ground now. Act quickly to protect your life.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4211 7692 4211 7655 4209 7655 4202 7656
      4201 7656 4200 7656 4200 7657 4200 7662
      4200 7664 4200 7675 4200 7681 4200 7682
      4200 7687 4200 7690

FLASH FLOOD...RADAR INDICATED

$$

Kistner

667 
WGUS71 KBGM 210542
FFSBGM

Flash Flood Statement
National Weather Service Binghamton NY
142 AM EDT Wed Jul 21 2021

NYC015-210552-
/O.CAN.KBGM.FF.W.0043.000000T0000Z-210721T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chemung NY-
142 AM EDT Wed Jul 21 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN CHEMUNG COUNTY...

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

LAT...LON 4211 7692 4211 7655 4209 7655 4202 7656
      4201 7656 4200 7656 4200 7657 4200 7662
      4200 7664 4200 7675 4200 7681 4200 7682
      4200 7687 4200 7690

$$

BJG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 9:28 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna, Wayne	62 min
Jul 21, 12:42 PM EDT	Special Weather Statement	BGM	Luzerne	18 min
Jul 21, 12:42 PM EDT	Special Weather Statement	BGM	Luzerne	18 min
Jul 20, 8:05 PM EDT	Severe Thunderstorm Warning	BGM	Broome, Chenango, Cortland, Delaware, Madison, Otsego and 1 more	55 min
Jul 20, 8:28 PM EDT	Flash Flood Warning	BGM	Chenango, Otsego	2 hr
Jul 20, 8:31 PM EDT	Severe Thunderstorm Warning	BGM	Broome, Chemung, Schuyler, Tioga, Tompkins	59 min
Jul 20, 8:49 PM EDT	Flash Flood Warning	BGM	Steuben	3 hr
Jul 20, 8:58 PM EDT	Severe Thunderstorm Warning	BGM	Broome, Chenango, Delaware, Otsego	45 min
Jul 20, 9:28 PM EDT	Flash Flood Warning	BGM	Broome, Chenango	3 hr
Jul 20, 9:36 PM EDT	Special Weather Statement	BGM	Steuben	24 min
Jul 20, 9:59 PM EDT	Special Weather Statement	BGM	Steuben	31 min
Jul 20, 10:28 PM EDT	Special Weather Statement	BGM	Chemung	32 min

Nearby

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