Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 91, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 10:19 PM EDT for Chautauqua County, New York. It was in force for 56 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, 10:19 PM EDT (02:19 UTC)
- Expired
- Jul 20, 2021, 11:15 PM EDT
- In force
- 56 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Chautauqua County, NY
The radar
The Buffalo radar (KBUF), 94 km from the middle of the area, began a volume at 02:17 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, 10:40 PM EDT | TSTM WND DMG | 1 Se Brocton, NY | TREES DOWN ON ROUTE 380. |
| Jul 20, 10:52 PM EDT | TSTM WND DMG | 1 Ssw Cassadaga, NY | TREES AND WIRES DOWN ON PUTNAM RD. |
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, 2.3 hours before the alert went out and 94 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.
918
WUUS51 KBUF 210219
SVRBUF
NYC013-210315-
/O.NEW.KBUF.SV.W.0091.210721T0219Z-210721T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1019 PM EDT Tue Jul 20 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Chautauqua County in western New York...
* Until 1115 PM EDT..
* At 1018 PM EDT, a severe thunderstorm was located 9 miles northwest
of Westfield, or 18 miles west of Fredonia, moving southeast at 45
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Jamestown, Dunkirk, Fredonia, Westfield, Lakewood, Falconer,
Mayville, Clymer, Long Point State Park and Jamestown West.
This includes the following highways...
Interstate 90 between exits 61 and 59.
Interstate 86 between exits 4 and 14.
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 4244 7950 4252 7941 4254 7935 4234 7906
4200 7906 4200 7976 4227 7976 4228 7973
4231 7977
TIME...MOT...LOC 0218Z 314DEG 37KT 4243 7969
HAIL...<.75IN
WIND...60MPH
$$
Reynolds2 follow-up statements
508
WWUS51 KBUF 210258
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1058 PM EDT Tue Jul 20 2021
NYC013-210315-
/O.CON.KBUF.SV.W.0091.000000T0000Z-210721T0315Z/
Chautauqua NY-
1058 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR CHAUTAUQUA COUNTY...
At 1058 PM EDT, a severe thunderstorm was located near Lakewood, or
near Jamestown, moving southeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jamestown, Fredonia, Lakewood, Falconer, Mayville, Long Point State
Park, Jamestown West, Chautauqua Institution, Frewsburg and
Chautauqua.
This includes the following highways...
Interstate 90 near exit 59.
Interstate 86 between exits 6 and 14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4234 7906 4200 7906 4200 7952 4222 7969
4249 7927
TIME...MOT...LOC 0258Z 314DEG 37KT 4214 7929
HAIL...<.75IN
WIND...60MPH
$$
Reynolds557
WWUS51 KBUF 210315
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
1115 PM EDT Tue Jul 20 2021
NYC013-210322-
/O.EXP.KBUF.SV.W.0091.000000T0000Z-210721T0315Z/
Chautauqua NY-
1115 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR CHAUTAUQUA COUNTY WILL EXPIRE
AT 1115 PM EDT...
The storm which prompted the warning has moved out of the warned
area. Therefore, the warning will be allowed to expire. However
gusty winds are still possible with this thunderstorm.
LAT...LON 4234 7906 4200 7906 4200 7952 4222 7969
4249 7927
TIME...MOT...LOC 0312Z 314DEG 37KT 4205 7916
$$
WelchThe 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, 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.