Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 88, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 8:28 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 62 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, 8:28 PM EDT (00:28 UTC)
- Expired
- Jul 20, 2021, 9:30 PM EDT
- In force
- 62 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
The radar
The Buffalo radar (KBUF), 100 km from the middle of the area, began a volume at 00:30 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 20, 8:36 PM EDT | TSTM WND DMG | Olean, NY | MULTIPLE REPORTS OF TREES DOWN IN OLEAN. |
| Jul 20, 8:42 PM EDT | TSTM WND DMG | Portville, NY | MULTIPLE REPORTS OF TREES DOWN IN PORTVILLE. |
| Jul 20, 8:57 PM EDT | TSTM WND DMG | Bolivar, NY | TREES DOWN IN BOLIVAR. |
| Jul 20, 9:16 PM EDT | TSTM WND DMG | Wellsville, NY | TREES DOWN IN WELLSVILLE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 0.5 hours before the alert went out and 97 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
- 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
The text
As transmitted.
144 WUUS51 KBUF 210028 SVRBUF NYC003-009-210130- /O.NEW.KBUF.SV.W.0088.210721T0028Z-210721T0130Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Buffalo NY 828 PM EDT Tue Jul 20 2021 The National Weather Service in Buffalo has issued a * Severe Thunderstorm Warning for... Southeastern Cattaraugus County in western New York... Southwestern Allegany County in western New York... * Until 930 PM EDT.. * At 828 PM EDT, a severe thunderstorm was located near Bradford, moving east at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Olean, Salamanca, Wellsville, Allegany State Park, Allegany, Cuba, St. Bonaventure, Weston Mills, Hinsdale and Friendship. This includes Interstate 86 between exits 23 and 27, and near exit 29. 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 4200 7872 4217 7870 4227 7790 4200 7786 TIME...MOT...LOC 0028Z 260DEG 35KT 4201 7854 HAIL...<.75IN WIND...60MPH $$ Reynolds
2 follow-up statements
406 WWUS51 KBUF 210054 SVSBUF Severe Weather Statement National Weather Service Buffalo NY 854 PM EDT Tue Jul 20 2021 NYC003-009-210130- /O.CON.KBUF.SV.W.0088.000000T0000Z-210721T0130Z/ Cattaraugus NY-Allegany NY- 854 PM EDT Tue Jul 20 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT FOR SOUTHEASTERN CATTARAUGUS AND SOUTHWESTERN ALLEGANY COUNTIES... At 853 PM EDT, a severe thunderstorm was located near Shinglehouse, or 11 miles east of Olean, moving east at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Olean, Wellsville, Allegany, Cuba, St. Bonaventure, Weston Mills, Hinsdale, Friendship, Scio and Bolivar. This includes Interstate 86 between exits 25 and 27, and near exit 29. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4200 7850 4218 7850 4227 7790 4200 7786 TIME...MOT...LOC 0053Z 260DEG 35KT 4205 7821 HAIL...<.75IN WIND...60MPH $$ Reynolds
944
WWUS51 KBUF 210110
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
910 PM EDT Tue Jul 20 2021
NYC009-210120-
/O.CAN.KBUF.SV.W.0088.000000T0000Z-210721T0130Z/
Cattaraugus NY-
910 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS
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 4200 7828 4220 7827 4227 7790 4200 7786
TIME...MOT...LOC 0110Z 260DEG 35KT 4208 7798
$$
NYC003-210130-
/O.CON.KBUF.SV.W.0088.000000T0000Z-210721T0130Z/
Allegany NY-
910 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR SOUTHWESTERN ALLEGANY COUNTY...
At 910 PM EDT, a severe thunderstorm was located near Wellsville,
moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Wellsville, Friendship, Scio, Bolivar, Belmont, Alma, Richburg, West
Clarksville, Stannards and Little Genesee.
This includes Interstate 86 near exit 29.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4200 7828 4220 7827 4227 7790 4200 7786
TIME...MOT...LOC 0110Z 260DEG 35KT 4208 7798
HAIL...<.75IN
WIND...60MPH
$$
ReynoldsThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:07 PM EDT | Areal Flood Warning | BUF | Livingston, Monroe, Ontario, Wayne | 81 min |
| Jul 20, 8:39 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Cattaraugus, Erie, Livingston, Wyoming | 53 min |
| Jul 20, 9:16 PM EDT | Severe Thunderstorm Warning | BUF | Allegany | 36 min |
| Jul 20, 9:45 PM EDT | Special Marine Warning | BUF | 60 min | |
| Jul 20, 10:14 PM EDT | Areal Flood Warning | BUF | Niagara | 9 hr |
| Jul 20, 10:19 PM EDT | Severe Thunderstorm Warning | BUF | Chautauqua | 56 min |
| Jul 20, 11:10 PM EDT | Special Weather Statement | BUF | Cattaraugus | 35 min |
| Jul 20, 11:29 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Cattaraugus, Chautauqua | 61 min |
| Jul 21, 12:31 AM EDT | Special Weather Statement | BUF | Allegany | 44 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.