Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 83, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 5:30 PM EDT for 4 counties in New York. It was in force for 60 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, 5:30 PM EDT (21:30 UTC)
- Expired
- Jul 20, 2021, 6:30 PM EDT
- In force
- 60 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Erie County, NY, Genesee County, NY, Niagara County, NY, Orleans County, NY
The radar
The Buffalo radar (KBUF), 20 km from the middle of the area, began a volume at 21:31 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, 5:50 PM EDT | HAIL 0.5 | Lockport, NY | HALF INCH (0.50IN) HAIL REPORTED IN THE TOWN OF LOCKPORT. NUMEROUS BRANCHES DOWN REPORTED AS WELL. |
| Jul 20, 5:51 PM EDT | TSTM WND DMG | Pendleton, NY | TREES DOWN IN PENDLETON. |
| Jul 20, 6:02 PM EDT | HAIL 0.5 | Lewiston, NY | GOLF BALL TO TENNIS BALL SIZED HAIL REPORTED IN THE TOWN OF LEWISTON. |
| Jul 20, 6:02 PM EDT | HAIL 2.5 | Lewiston, NY | CORRECTS PREVIOUS HAIL REPORT FROM LEWISTON. GOLF BALL TO TENNIS BALL SIZED HAIL REPORTED IN THE TOWN OF LEWISTON. |
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 |
|---|---|---|---|
| Jul 20, 3:05 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.5 hours before the alert went out and 23 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
- 574 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 893 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
The text
As transmitted.
108
WUUS51 KBUF 202130
SVRBUF
NYC029-037-063-073-202230-
/O.NEW.KBUF.SV.W.0083.210720T2130Z-210720T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
530 PM EDT Tue Jul 20 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Northeastern Erie County in western New York...
Niagara County in western New York...
Western Orleans County in western New York...
Western Genesee County in western New York...
* Until 630 PM EDT..
* At 529 PM EDT, a severe thunderstorm was located over Lewiston, or
near Niagara Falls, moving east at 20 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...
Buffalo, Cheektowaga, North Tonawanda, Clarence, Lockport, Kenmore,
Depew, Tonawanda, Amherst and Medina.
This includes Interstate 90 between exits 51 and 48A.
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 4328 7906 4335 7828 4289 7834 4294 7891
4296 7893 4296 7896 4299 7901 4302 7902
4303 7901 4306 7900 4307 7901 4307 7904
4315 7904
TIME...MOT...LOC 2129Z 277DEG 18KT 4317 7898
HAIL...1.00IN
WIND...60MPH
$$
Reynolds2 follow-up statements
336
WWUS51 KBUF 202202
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
602 PM EDT Tue Jul 20 2021
NYC029-037-063-073-202230-
/O.CON.KBUF.SV.W.0083.000000T0000Z-210720T2230Z/
Erie NY-Niagara NY-Orleans NY-Genesee NY-
602 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHEASTERN ERIE...NIAGARA...WESTERN ORLEANS AND WESTERN GENESEE
COUNTIES...
At 601 PM EDT, a severe thunderstorm was located near Lockport,
moving east at 20 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Buffalo, Cheektowaga, North Tonawanda, Clarence, Lockport, Kenmore,
Depew, Tonawanda, Amherst and Medina.
This includes Interstate 90 between exits 51 and 48A.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4335 7828 4289 7834 4294 7891 4296 7893
4296 7896 4299 7901 4302 7902 4306 7900
4307 7901 4307 7904 4315 7904 4326 7906
TIME...MOT...LOC 2201Z 277DEG 18KT 4315 7876
HAIL...1.25IN
WIND...60MPH
$$
Reynolds595
WWUS51 KBUF 202232
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
632 PM EDT Tue Jul 20 2021
NYC029-037-063-073-202241-
/O.EXP.KBUF.SV.W.0083.000000T0000Z-210720T2230Z/
Erie NY-Niagara NY-Orleans NY-Genesee NY-
632 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ERIE...NIAGARA...
WESTERN ORLEANS AND WESTERN GENESEE COUNTIES HAS EXPIRED...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western New York.
LAT...LON 4335 7828 4289 7834 4294 7891 4296 7893
4296 7896 4299 7901 4302 7902 4306 7900
4307 7901 4307 7904 4315 7904 4326 7906
TIME...MOT...LOC 2231Z 277DEG 18KT 4314 7859
$$
EAJThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:13 PM EDT | Special Marine Warning | BUF | 62 min | |
| Jul 20, 2:57 PM EDT | Special Weather Statement | BUF | Niagara | 48 min |
| Jul 20, 3:14 PM EDT | Special Marine Warning | BUF | 61 min | |
| Jul 20, 3:23 PM EDT | Severe Thunderstorm Warning | BUF | Niagara | 67 min |
| Jul 20, 3:39 PM EDT | Special Marine Warning | BUF | 81 min | |
| Jul 20, 3:48 PM EDT | Special Marine Warning | BUF | 87 min | |
| Jul 20, 4:08 PM EDT | Severe Thunderstorm Warning | BUF | Jefferson, Lewis | 67 min |
| Jul 20, 4:23 PM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Niagara, Orleans | 67 min |
| Jul 20, 4:42 PM EDT | Severe Thunderstorm Warning | BUF | Niagara | 48 min |
| Jul 20, 4:46 PM EDT | Special Marine Warning | BUF | 59 min | |
| Jul 20, 4:49 PM EDT | Flash Flood Warning | BUF | Niagara | 6 hr |
| Jul 20, 4:55 PM EDT | Special Marine Warning | BUF | 48 min | |
| Jul 20, 4:58 PM EDT | Special Marine Warning | BUF | 92 min | |
| Jul 20, 5:00 PM EDT | Special Weather Statement | BUF | Genesee | 30 min |
| Jul 20, 5:10 PM EDT | Special Marine Warning | BUF | 2 hr | |
| Jul 20, 5:13 PM EDT | Severe Thunderstorm Warning | BUF | Jefferson, Lewis, Oswego | 62 min |
| Jul 20, 5:28 PM EDT | Special Weather Statement | BUF | Oswego | 47 min |
| Jul 20, 5:43 PM EDT | Special Marine Warning | BUF | 92 min | |
| Jul 20, 5:43 PM EDT | Severe Thunderstorm Warning | BUF | Oswego | 62 min |
| Jul 20, 5:56 PM EDT | Special Weather Statement | BUF | Genesee, Monroe, Ontario, Orleans | 34 min |
| Jul 20, 6:07 PM EDT | Severe Thunderstorm Warning | BUF | Cayuga, Jefferson, Lewis, Oswego, Wayne | 38 min |
| Jul 20, 6:21 PM EDT | Flash Flood Warning | BUF | Erie, Niagara | 4 hr |
| Jul 20, 6:26 PM EDT | Special Marine Warning | BUF | 34 min | |
| Jul 20, 6:30 PM EDT | Special Weather Statement | BUF | Erie, Genesee | 30 min |
| Jul 20, 6:37 PM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Niagara | 46 min |
| Jul 20, 6:46 PM EDT | Special Weather Statement | BUF | Lewis | 29 min |
| Jul 20, 6:52 PM EDT | Special Marine Warning | BUF | 67 min | |
| Jul 20, 7:24 PM EDT | Special Weather Statement | BUF | Erie, Genesee, Livingston, Ontario, Wyoming | 36 min |
| Jul 20, 7:38 PM EDT | Severe Thunderstorm Warning | BUF | Livingston, Monroe, Ontario, Wayne | 31 min |
| Jul 20, 7:58 PM EDT | Special Weather Statement | BUF | Livingston, Wyoming | 92 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.