Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 92, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 11:29 PM EDT for Allegany County, Cattaraugus County, Chautauqua County, New York. It was in force for 61 min. 2 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, 11:29 PM EDT (03:29 UTC)
- Expired
- Jul 21, 2021, 12:30 AM EDT
- In force
- 61 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
The radar
The Buffalo radar (KBUF), 84 km from the middle of the area, began a volume at 03:34 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, 11:30 PM EDT | TSTM WND DMG | 6 Wsw Cattaraugus, NY | MULTIPLE REPORTS OF TREES DOWN IN LEON AREA. |
| Jul 21, 12:21 AM EDT | TSTM WND DMG | Olean, NY | MULTIPLE REPORTS OF WIRES DOWN IN AND AROUND OLEAN. |
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, 3.5 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.
- 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.
829
WUUS51 KBUF 210329
SVRBUF
NYC003-009-013-210430-
/O.NEW.KBUF.SV.W.0092.210721T0329Z-210721T0430Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1129 PM EDT Tue Jul 20 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Cattaraugus County in western New York...
East central Chautauqua County in western New York...
West central Allegany County in western New York...
* Until 1230 AM EDT..
* At 1128 PM EDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Gowanda to near Falconer,
moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Olean, Salamanca, Allegany State Park, Ashford, Allegany,
Franklinville, Cuba, St. Bonaventure, Ashford Hollow and Weston
Mills.
This includes Interstate 86 between exits 13 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Buffalo.
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 7892 4215 7924 4244 7889 4246 7880
4231 7796 4200 7834
TIME...MOT...LOC 0328Z 290DEG 29KT 4242 7883 4215 7915
HAIL...<.75IN
WIND...60MPH
$$
Welch3 follow-up statements
362
WWUS51 KBUF 210402
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1202 AM EDT Wed Jul 21 2021
NYC013-210410-
/O.CAN.KBUF.SV.W.0092.000000T0000Z-210721T0430Z/
Chautauqua NY-
1202 AM EDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHAUTAUQUA COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4200 7892 4215 7887 4222 7877 4227 7864
4220 7809 4200 7834
TIME...MOT...LOC 0400Z 292DEG 25KT 4214 7867
$$
NYC003-009-210430-
/O.CON.KBUF.SV.W.0092.000000T0000Z-210721T0430Z/
Cattaraugus NY-Allegany NY-
1202 AM EDT Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR SOUTHEASTERN CATTARAUGUS AND WEST CENTRAL ALLEGANY COUNTIES...
At 1200 AM EDT, a severe thunderstorm was located near Salamanca,
moving southeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Olean, Salamanca, Allegany State Park, Allegany, Cuba, St.
Bonaventure, Weston Mills, Hinsdale, Friendship and Great Valley.
This includes Interstate 86 between exits 18 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Buffalo.
Frequent cloud to ground lightning is occurring with this storm.
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 7892 4215 7887 4222 7877 4227 7864
4220 7809 4200 7834
TIME...MOT...LOC 0400Z 292DEG 25KT 4214 7867
HAIL...<.75IN
WIND...60MPH
$$
Welch195
WWUS51 KBUF 210413
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1213 AM EDT Wed Jul 21 2021
NYC003-009-210430-
/O.CON.KBUF.SV.W.0092.000000T0000Z-210721T0430Z/
Cattaraugus NY-Allegany NY-
1213 AM EDT Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR SOUTHEASTERN CATTARAUGUS AND WEST CENTRAL ALLEGANY COUNTIES...
At 1213 AM EDT, a severe thunderstorm was located over Allegany, or
near Olean, moving southeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Olean, Allegany State Park, Allegany, Cuba, St. Bonaventure, Weston
Mills, Hinsdale, Friendship, Carrollton and Portville.
This includes Interstate 86 between exits 23 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Buffalo.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4200 7879 4211 7873 4225 7850 4220 7809
4200 7834
TIME...MOT...LOC 0413Z 314DEG 29KT 4206 7853
HAIL...1.00IN
WIND...60MPH
$$
Mitchell050
WWUS51 KBUF 210430
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1230 AM EDT Wed Jul 21 2021
NYC003-009-210440-
/O.EXP.KBUF.SV.W.0092.000000T0000Z-210721T0430Z/
Cattaraugus NY-Allegany NY-
1230 AM EDT Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS AND
WEST CENTRAL ALLEGANY COUNTIES HAS EXPIRED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire. However small
hail and gusty winds are still possible with this thunderstorm.
LAT...LON 4200 7879 4211 7873 4225 7850 4220 7809
4200 7834
TIME...MOT...LOC 0430Z 290DEG 29KT 4203 7842
$$
MitchellThe 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, 8:28 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Cattaraugus | 62 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 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.