Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 77, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 17, 2021, 3:46 PM EDT for 4 counties in New York. It was in force for 44 min. 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 17, 2021, 3:46 PM EDT (19:46 UTC)
- Expired
- Jul 17, 2021, 4:30 PM EDT
- In force
- 44 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegany County, NY, Cattaraugus County, NY, Erie County, NY, Wyoming County, NY
The radar
The Buffalo radar (KBUF), 62 km from the middle of the area, began a volume at 19:51 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 12:00Z, 7.8 hours before the alert went out and 58 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
349
WUUS51 KBUF 171946
SVRBUF
NYC003-009-029-121-172030-
/O.NEW.KBUF.SV.W.0077.210717T1946Z-210717T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
346 PM EDT Sat Jul 17 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Southwestern Wyoming County in western New York...
Northeastern Cattaraugus County in western New York...
Southeastern Erie County in western New York...
Northwestern Allegany County in western New York...
* Until 430 PM EDT..
* At 346 PM EDT, a severe thunderstorm was located near Arcade, or 22
miles south of East Aurora, moving east at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Arcade, Rushford, Houghton, Yorkshire, Sardinia, Eagle, Pike,
Delevan, Gainesville and Short Tract.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4251 7860 4268 7811 4254 7805 4253 7806
4243 7800 4235 7852
TIME...MOT...LOC 1946Z 251DEG 19KT 4246 7848
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
Mitchell2 follow-up statements
815
WWUS51 KBUF 172016
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
416 PM EDT Sat Jul 17 2021
NYC029-172024-
/O.CAN.KBUF.SV.W.0077.000000T0000Z-210717T2030Z/
Erie NY-
416 PM EDT Sat Jul 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ERIE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4268 7811 4254 7805 4253 7806 4243 7800
4239 7829 4258 7840
TIME...MOT...LOC 2014Z 244DEG 15KT 4252 7830
$$
NYC003-009-121-172030-
/O.CON.KBUF.SV.W.0077.000000T0000Z-210717T2030Z/
Wyoming NY-Cattaraugus NY-Allegany NY-
416 PM EDT Sat Jul 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN WYOMING...NORTHEASTERN CATTARAUGUS AND NORTHWESTERN
ALLEGANY COUNTIES...
At 414 PM EDT, a severe thunderstorm was located near Arcade, or 18
miles southwest of Letchworth State Park, moving northeast at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Houghton, Eagle, Pike, Gainesville, Short Tract, Rossburg, Hermitage,
Fillmore and Bliss.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Heavy rainfall is occurring with this storm, and may lead to flash
flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4268 7811 4254 7805 4253 7806 4243 7800
4239 7829 4258 7840
TIME...MOT...LOC 2014Z 244DEG 15KT 4252 7830
HAIL...<.75IN
WIND...60MPH
$$
Welch368
WWUS51 KBUF 172032
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
432 PM EDT Sat Jul 17 2021
NYC003-009-121-172041-
/O.EXP.KBUF.SV.W.0077.000000T0000Z-210717T2030Z/
Wyoming NY-Cattaraugus NY-Allegany NY-
432 PM EDT Sat Jul 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WYOMING...
NORTHEASTERN CATTARAUGUS AND NORTHWESTERN ALLEGANY COUNTIES HAS
EXPIRED...
The storm which prompted the warning has weakened below severe
limits. Therefore, the warning has been allowed to expire. However
gusty winds and heavy rain are still possible with this thunderstorm.
LAT...LON 4268 7811 4254 7805 4253 7806 4243 7800
4239 7829 4258 7840
TIME...MOT...LOC 2031Z 251DEG 19KT 4255 7819
$$
WelchThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 4:15 AM EDT | Beach Hazards Statement | BUF | Chautauqua, Monroe, Niagara, Orleans, Wayne | 32 hr |
| Jul 17, 4:42 AM EDT | Special Weather Statement | BUF | Chautauqua | 48 min |
| Jul 17, 6:12 AM EDT | Areal Flood Warning | BUF | Erie, Genesee, Livingston, Monroe, Niagara, Orleans and 1 more | 13 hr |
| Jul 17, 7:39 AM EDT | Special Weather Statement | BUF | Chautauqua | 36 min |
| Jul 17, 7:59 AM EDT | Flash Flood Warning | BUF | Chautauqua | 3 hr |
| Jul 17, 9:11 AM EDT | Areal Flood Warning | BUF | Chautauqua | 3 hr |
| Jul 17, 1:48 PM EDT | Severe Thunderstorm Warning | BUF | Allegany | 42 min |
| Jul 17, 2:10 PM EDT | Areal Flood Warning | BUF | Monroe | 40 hr |
| Jul 17, 3:15 PM EDT | Flash Flood Warning | BUF | Cattaraugus, Erie | 6 hr |
| Jul 17, 3:15 PM EDT | Tornado Warning | BUF | Cattaraugus, Erie | 30 min |
| Jul 17, 4:30 PM EDT | Special Weather Statement | BUF | Livingston | 45 min |
| Jul 17, 4:35 PM EDT | River Flood Warning | BUF | Cattaraugus, Chautauqua, Erie, Wyoming | 10 hr |
| Jul 17, 5:15 PM EDT | Areal Flood Warning | BUF | Livingston, Ontario | 3 hr |
| Jul 17, 5:28 PM EDT | Areal Flood Warning | BUF | Allegany, Cattaraugus | 5 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.