Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 201, NWS Binghamton, NY

July 20, 20217 counties in New York

NWS Binghamton, NY issued this severe thunderstorm warning at Jul 20, 2021, 8:05 PM EDT for 7 counties in New York. It was in force for 55 min. 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 20, 2021, 8:05 PM EDT (00:05 UTC)
Expired
Jul 20, 2021, 9:00 PM EDT
In force
55 min
Issued by
NWS Binghamton, NY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Broome County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Madison County, NY, Otsego County, NY, Tioga County, NY

The radar

The Albany radar (KENX), 62 km from the middle of the area, began a volume at 00:07 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

TimeReportWhereRemark
Jul 20, 8:08 PM EDTTSTM WND DMG2 Nnw Plymouth, NYSTRONG THUNDERSTORM WINDS KNOCKED DOWN TREE ON ROADWAY.
Jul 20, 8:19 PM EDTTSTM WND DMG3.23 Ese Mc Donough, NYSTRONG THUNDERSTORM WINDS KNOCKED DOWN TREE ON ROAD.
Jul 20, 8:29 PM EDTTSTM WND DMGNorwich, NYSTRONG THUNDERSTORM WINDS KNOCKED DOWN TREE ON ROAD.
Jul 20, 9:10 PM EDTTSTM WND DMGAfton, NYTREES AND WIRED DOWN.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 20, 3:05 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.1 hours before the alert went out and 82 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-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2021-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1226 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2021-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1226 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1198 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.4
Supercell composite
4.6

Open this sounding in Storm Lab

The text

As transmitted.

994 
WUUS51 KBGM 210005
SVRBGM
NYC007-017-023-025-053-077-107-210100-
/O.NEW.KBGM.SV.W.0201.210721T0005Z-210721T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Binghamton NY
805 PM EDT Tue Jul 20 2021

The National Weather Service in Binghamton has issued a

* Severe Thunderstorm Warning for...
  Otsego County in central New York...
  Central Broome County in central New York...
  Southeastern Madison County in central New York...
  Delaware County in central New York...
  Southeastern Cortland County in central New York...
  Northeastern Tioga County in central New York...
  Chenango County in central New York...

* Until 900 PM EDT.

* At 805 PM EDT, severe thunderstorms were located along a line
  extending from Leonardsville to near Marathon, moving east at 70
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Oneonta, Norwich, Sidney, Walton, Delhi, Davenport, Guilford,
  Roxbury, Worcester and Middlefield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Heavy rainfall is occurring with these storms, and may lead to flash
flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4221 7453 4217 7446 4215 7453 4212 7456
      4203 7475 4236 7624 4286 7520 4286 7514
      4291 7509 4283 7491 4283 7489 4288 7488
      4283 7465 4276 7467 4263 7463 4252 7471
      4242 7461 4235 7443
TIME...MOT...LOC 0005Z 278DEG 59KT 4278 7526 4239 7610 

HAIL...1.00IN
WIND...60MPH
 
$$

HLC
1 follow-up statement
021 
WWUS51 KBGM 210036
SVSBGM

Severe Weather Statement
National Weather Service Binghamton NY
836 PM EDT Tue Jul 20 2021

NYC023-053-107-210045-
/O.CAN.KBGM.SV.W.0201.000000T0000Z-210721T0100Z/
Madison NY-Cortland NY-Tioga NY-
836 PM EDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MADISON...
SOUTHEASTERN CORTLAND AND NORTHEASTERN TIOGA COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central New York.

LAT...LON 4221 7453 4217 7446 4203 7475 4233 7610
      4241 7595 4241 7587 4246 7587 4275 7533
      4274 7530 4289 7506 4283 7491 4284 7489
      4288 7488 4283 7465 4276 7467 4263 7463
      4252 7471 4242 7461 4235 7443
TIME...MOT...LOC 0035Z 290DEG 21KT 4272 7503 4233 7587 

$$

NYC007-017-025-077-210100-
/O.CON.KBGM.SV.W.0201.000000T0000Z-210721T0100Z/
Otsego NY-Broome NY-Delaware NY-Chenango NY-
836 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR OTSEGO...CENTRAL BROOME...DELAWARE AND CHENANGO COUNTIES...

At 835 PM EDT, severe thunderstorms were located along a line
extending from near Hartwick to near Whitney Point, moving east at 25
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Oneonta, Norwich, Sidney, Walton, Delhi, Davenport, Guilford,
Roxbury, Worcester and Middlefield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4221 7453 4217 7446 4203 7475 4233 7610
      4241 7595 4241 7587 4246 7587 4275 7533
      4274 7530 4289 7506 4283 7491 4284 7489
      4288 7488 4283 7465 4276 7467 4263 7463
      4252 7471 4242 7461 4235 7443
TIME...MOT...LOC 0035Z 290DEG 21KT 4272 7503 4233 7587 

HAIL...1.00IN
WIND...60MPH
 
$$

HLC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 8:28 PM EDTFlash Flood WarningBGMChenango, Otsego2 hr
Jul 20, 8:31 PM EDTSevere Thunderstorm WarningBGMBroome, Chemung, Schuyler, Tioga, Tompkins59 min
Jul 20, 8:49 PM EDTFlash Flood WarningBGMSteuben3 hr
Jul 20, 8:58 PM EDTSevere Thunderstorm WarningBGMBroome, Chenango, Delaware, Otsego45 min
Jul 20, 9:28 PM EDTFlash Flood WarningBGMBroome, Chenango3 hr
Jul 20, 9:28 PM EDTSevere Thunderstorm WarningBGMBroome, Delaware, Tioga62 min
Jul 20, 9:36 PM EDTSpecial Weather StatementBGMSteuben24 min
Jul 20, 9:59 PM EDTSpecial Weather StatementBGMSteuben31 min
Jul 20, 10:28 PM EDTSpecial Weather StatementBGMChemung32 min
Jul 20, 10:54 PM EDTFlash Flood WarningBGMChemung3 hr

Nearby

Severe Thunderstorm Warnings in New York, 2021Every severe thunderstorm 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.