Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 87, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 20, 2021, 7:38 PM EDT for 4 counties in New York. It was in force for 31 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, 7:38 PM EDT (23:38 UTC)
- Expired
- Jul 20, 2021, 8:09 PM EDT
- In force
- 31 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Livingston County, NY, Monroe County, NY, Ontario County, NY, Wayne County, NY
The radar
The Binghamton radar (KBGM), 125 km from the middle of the area, began a volume at 23:41 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, 7:55 PM EDT | TSTM WND DMG | 2 W Clifton Springs, NY | TWO TREES DOWN ON COUNTY ROAD 13. |
| Jul 20, 8:03 PM EDT | TSTM WND DMG | 2 Se Clifton Springs, NY | TREE DOWN ON WHEAT 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 |
|---|---|---|---|
| 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, 11.6 hours before the alert went out and 123 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.
614
WUUS51 KBUF 202338
SVRBUF
NYC051-055-069-117-210045-
/O.NEW.KBUF.SV.W.0087.210720T2338Z-210721T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
738 PM EDT Tue Jul 20 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Southern Wayne County in western New York...
Northeastern Livingston County in western New York...
Southeastern Monroe County in western New York...
Ontario County in western New York...
* Until 845 PM EDT..
* At 737 PM EDT, a severe thunderstorm was located over Honeoye
Falls, or 11 miles south of Brighton, moving east at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Geneva, Canandaigua, Newark, Lyons, Palmyra, Victor, Honeoye Falls,
Bristol, Lima and Clifton Springs.
This includes the following highways...
Interstate 390 near exit 11.
Interstate 90 between exits 46 and 42.
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 4280 7767 4305 7768 4309 7685 4302 7686
4301 7696 4287 7696 4286 7698 4276 7698
4276 7723
TIME...MOT...LOC 2337Z 268DEG 15KT 4295 7757
HAIL...<.75IN
WIND...60MPH
$$
Reynolds2 follow-up statements
068
WWUS51 KBUF 202359
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
759 PM EDT Tue Jul 20 2021
NYC051-055-069-117-210045-
/O.CON.KBUF.SV.W.0087.000000T0000Z-210721T0045Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
759 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR SOUTHEASTERN WAYNE...NORTHEASTERN LIVINGSTON...SOUTH CENTRAL
MONROE AND ONTARIO COUNTIES...
At 758 PM EDT, a severe thunderstorm was located over Victor, or 9
miles northwest of Canandaigua, moving east at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Geneva, Canandaigua, Newark, Lyons, Victor, Honeoye Falls, Bristol,
Lima, Clifton Springs and Clyde.
This includes Interstate 90 between exits 45 and 42.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4280 7767 4298 7767 4309 7685 4302 7686
4301 7696 4287 7696 4286 7698 4276 7698
4276 7723
TIME...MOT...LOC 2358Z 268DEG 15KT 4295 7745
HAIL...<.75IN
WIND...60MPH
$$
EAJ144
WWUS51 KBUF 210009
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
809 PM EDT Tue Jul 20 2021
NYC051-055-069-117-210019-
/O.CAN.KBUF.SV.W.0087.000000T0000Z-210721T0045Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
809 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WAYNE...
NORTHEASTERN LIVINGSTON...SOUTH CENTRAL MONROE AND ONTARIO COUNTIES
IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western New York.
LAT...LON 4280 7767 4298 7767 4309 7685 4302 7686
4301 7696 4287 7696 4286 7698 4276 7698
4276 7723
TIME...MOT...LOC 0007Z 268DEG 15KT 4295 7739
$$
ReynoldsThe 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, 5:30 PM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Niagara, Orleans | 60 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, 7:58 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.