Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 107, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Sep 12, 2021, 11:49 PM EDT for 6 counties in New York. It was in force for 86 min. 3 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
- Sep 12, 2021, 11:49 PM EDT (03:49 UTC)
- Expired
- Sep 13, 2021, 1:15 AM EDT
- In force
- 86 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Livingston County, NY, Wyoming County, NY
The radar
The Buffalo radar (KBUF), 76 km from the middle of the area, began a volume at 03:51 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 13, 12:14 AM EDT | TSTM WND DMG | Little Valley, NY | TREE DOWN ON POWERLINE. |
| Sep 13, 12:22 AM EDT | TSTM WND DMG | Salamanca, NY | TREES DOWN ON ROADWAY. |
| Sep 13, 12:57 AM EDT | TORNADO | 3 Nw Springwater, NY | DOZENS OF HARDWOOD AND SOFTWOOD TREE TRUNKS WERE SHEARED IN HALF WITH DAMAGE TO THE ROOF OF AN OUTDOOR SHED. THE TRACK OF THE TORNADO STARTED JUST WEST OF ROUTE 15 AND ENDED JUST EAST OF MARROWBACK ROAD. |
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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 12, 10:25 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 3.8 hours before the alert went out and 72 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
- 412 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 706 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.5
The text
As transmitted.
222
WUUS51 KBUF 130349
SVRBUF
NYC003-009-013-029-051-121-130515-
/O.NEW.KBUF.SV.W.0107.210913T0349Z-210913T0515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1149 PM EDT Sun Sep 12 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Wyoming County in western New York...
Cattaraugus County in western New York...
Southeastern Erie County in western New York...
Livingston County in western New York...
Southeastern Chautauqua County in western New York...
Allegany County in western New York...
* Until 115 AM EDT.
* At 1148 PM EDT, severe thunderstorms were located along a line
extending from 14 miles northwest of Angola on the Lake to near
Silver Creek to Mayville, moving east at 70 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
West Seneca, Olean, Geneseo, East Aurora, Salamanca, Dansville,
Wellsville, Allegany State Park, Letchworth State Park and Elma.
This includes the following highways...
Interstate 390 between exits 4 and 8.
Interstate 86 between exits 14 and 33.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4200 7923 4285 7871 4285 7761 4258 7761
4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 0348Z 282DEG 61KT 4282 7922 4252 7923 4227 7952
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RSH3 follow-up statements
028
WWUS51 KBUF 130418
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1218 AM EDT Mon Sep 13 2021
NYC003-009-013-029-051-121-130515-
/O.CON.KBUF.SV.W.0107.000000T0000Z-210913T0515Z/
Wyoming NY-Cattaraugus NY-Erie NY-Livingston NY-Chautauqua NY-
Allegany NY-
1218 AM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR WYOMING...CATTARAUGUS...SOUTHEASTERN ERIE...LIVINGSTON...
SOUTHEASTERN CHAUTAUQUA AND ALLEGANY COUNTIES...
At 1217 AM EDT, severe thunderstorms were located along a line
extending from near Wales Center to near Ashford Hollow to 10 miles
west of Salamanca, moving east at 70 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
West Seneca, Olean, Geneseo, East Aurora, Salamanca, Dansville,
Wellsville, Allegany State Park, Letchworth State Park and Elma.
This includes the following highways...
Interstate 390 between exits 4 and 8.
Interstate 86 between exits 14 and 33.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4200 7923 4285 7871 4285 7761 4258 7761
4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 0417Z 281DEG 61KT 4272 7856 4242 7863 4218 7892
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
RSH316
WWUS51 KBUF 130443
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1243 AM EDT Mon Sep 13 2021
NYC013-029-130452-
/O.CAN.KBUF.SV.W.0107.000000T0000Z-210913T0515Z/
Erie NY-Chautauqua NY-
1243 AM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ERIE AND
SOUTHEASTERN CHAUTAUQUA COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning for Chautauqua and southern Erie
county has been cancelled.
A Severe Thunderstorm Watch remains in effect until 200 AM EDT for
western New York.
LAT...LON 4200 7875 4285 7821 4285 7761 4258 7761
4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 0442Z 281DEG 65KT 4262 7802 4232 7809 4208 7838
$$
NYC003-009-051-121-130515-
/O.CON.KBUF.SV.W.0107.000000T0000Z-210913T0515Z/
Wyoming NY-Cattaraugus NY-Livingston NY-Allegany NY-
1243 AM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR WYOMING...EASTERN CATTARAUGUS...LIVINGSTON AND ALLEGANY
COUNTIES...
At 1242 AM EDT, severe thunderstorms were located along a line
extending from near Letchworth State Park to Belfast to Weston Mills,
moving east at 75 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Olean, Geneseo, Dansville, Wellsville, Letchworth State Park,
Allegany State Park, Alfred, Perry, Warsaw and Mount Morris.
This includes the following highways...
Interstate 390 between exits 4 and 8.
Interstate 86 between exits 23 and 33.
LAT...LON 4200 7875 4285 7821 4285 7761 4258 7761
4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 0442Z 281DEG 65KT 4262 7802 4232 7809 4208 7838
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RSH212
WWUS51 KBUF 130512
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
112 AM EDT Mon Sep 13 2021
NYC003-009-051-121-130522-
/O.EXP.KBUF.SV.W.0107.000000T0000Z-210913T0515Z/
Wyoming NY-Cattaraugus NY-Livingston NY-Allegany NY-
112 AM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR WYOMING...EASTERN
CATTARAUGUS...LIVINGSTON AND ALLEGANY COUNTIES WILL EXPIRE AT 115 AM
EDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 200 AM EDT for
western New York.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Buffalo.
LAT...LON 4200 7875 4285 7821 4285 7761 4258 7761
4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 0512Z 282DEG 61KT 4253 7743 4223 7750 4199 7779
$$
RSHThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 10:53 PM EDT | Special Marine Warning | BUF | 82 min | |
| Sep 12, 11:00 PM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua, Erie | 75 min |
| Sep 13, 12:09 AM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Wyoming | 66 min |
| Sep 13, 12:25 AM EDT | Flash Flood Warning | BUF | Erie, Genesee, Wyoming | 3 hr |
| Sep 13, 12:50 AM EDT | Severe Thunderstorm Warning | BUF | Livingston, Ontario | 55 min |
| Sep 13, 1:09 AM EDT | Special Weather Statement | BUF | Genesee, Monroe, Ontario, Wayne | 66 min |
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.