Alert archive / New York / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 70, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jul 29, 2020, 2:49 PM EDT for 5 counties in New York. It was in force for 56 min. 5 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 29, 2020, 2:49 PM EDT (18:49 UTC)
- Expired
- Jul 29, 2020, 3:45 PM EDT
- In force
- 56 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Allegany County, NY, Cattaraugus County, NY, Erie County, NY, Livingston County, NY, Wyoming County, NY
The radar
The Buffalo radar (KBUF), 76 km from the middle of the area, began a volume at 18:53 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 29, 2:57 PM EDT | TSTM WND DMG | 1 S Delevan, NY | TREES DOWN ON POWER LINES |
| Jul 29, 3:10 PM EDT | TSTM WND DMG | Eagle, NY | TREES AND POWER LINES DOWN ON ROUTE 39 |
| Jul 29, 3:14 PM EDT | TSTM WND DMG | 1 Ne Eagle, NY | TREES DOWN |
| Jul 29, 3:30 PM EDT | TSTM WND DMG | Portageville, NY | TREES AND POWERLINES DOWN |
| Jul 29, 3:35 PM EDT | TSTM WND DMG | 1 N Nunda, NY | MANY TREES DOWN NORTH OF NUNDA |
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 12:00Z, 6.8 hours before the alert went out and 72 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
- 95 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 995 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
669
WUUS51 KBUF 291849
SVRBUF
NYC003-009-029-051-121-291945-
/O.NEW.KBUF.SV.W.0070.200729T1849Z-200729T1945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
249 PM EDT Wed Jul 29 2020
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Southern Wyoming County in western New York...
Northeastern Cattaraugus County in western New York...
Southeastern Erie County in western New York...
Southwestern Livingston County in western New York...
Northern Allegany County in western New York...
* Until 345 PM EDT..
* At 248 PM EDT, a severe thunderstorm was located near Ashford
Hollow, or 18 miles north of Salamanca, moving east at 30 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...
Dansville, Letchworth State Park, Springville, Arcade,
Franklinville, Belfast, Rushford, Houghton, Portageville and
Yorkshire.
This includes Interstate 390 between exits 4 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is an EXTREMELY DANGEROUS SITUATION. This storm has a history
of producing widespread wind damage across Chautauqua County. SEEK
SHELTER NOW inside a sturdy structure and stay away from windows!
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 4250 7871 4267 7773 4253 7769 4253 7772
4241 7773 4236 7773 4230 7857
TIME...MOT...LOC 1848Z 264DEG 28KT 4241 7861
HAIL...1.00IN
WIND...60MPH
$$
Fries2 follow-up statements
401
WWUS51 KBUF 291912
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
312 PM EDT Wed Jul 29 2020
NYC029-291921-
/O.CAN.KBUF.SV.W.0070.000000T0000Z-200729T1945Z/
Erie NY-
312 PM EDT Wed Jul 29 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ERIE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4267 7773 4253 7769 4253 7772 4241 7773
4236 7773 4232 7831 4254 7846
TIME...MOT...LOC 1911Z 255DEG 38KT 4252 7827
$$
NYC003-009-051-121-291945-
/O.CON.KBUF.SV.W.0070.000000T0000Z-200729T1945Z/
Wyoming NY-Cattaraugus NY-Livingston NY-Allegany NY-
312 PM EDT Wed Jul 29 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR SOUTHERN WYOMING...NORTHEASTERN CATTARAUGUS...SOUTHWESTERN
LIVINGSTON AND NORTHERN ALLEGANY COUNTIES...
At 311 PM EDT, a severe thunderstorm was located 8 miles east of
Arcade, or 17 miles southwest of Letchworth State Park, moving east
at 45 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...
Dansville, Letchworth State Park, Arcade, Belfast, Rushford,
Houghton, Portageville, Caneadea, Nunda and Eagle.
This includes Interstate 390 between exits 4 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is an EXTREMELY DANGEROUS SITUATION. This storm has a history
of producing widespread wind damage. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.
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 4267 7773 4253 7769 4253 7772 4241 7773
4236 7773 4232 7831 4254 7846
TIME...MOT...LOC 1911Z 255DEG 38KT 4252 7827
HAIL...1.00IN
WIND...60MPH
$$
Fries336
WWUS51 KBUF 291930
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
330 PM EDT Wed Jul 29 2020
NYC009-291940-
/O.CAN.KBUF.SV.W.0070.000000T0000Z-200729T1945Z/
Cattaraugus NY-
330 PM EDT Wed Jul 29 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CATTARAUGUS
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4267 7773 4253 7769 4253 7772 4241 7773
4236 7773 4233 7819 4249 7814 4258 7824
TIME...MOT...LOC 1930Z 264DEG 38KT 4254 7797
$$
NYC003-051-121-291945-
/O.CON.KBUF.SV.W.0070.000000T0000Z-200729T1945Z/
Wyoming NY-Livingston NY-Allegany NY-
330 PM EDT Wed Jul 29 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR SOUTHEASTERN WYOMING...SOUTHWESTERN LIVINGSTON AND NORTHERN
ALLEGANY COUNTIES...
At 330 PM EDT, a severe thunderstorm was located near Portageville,
or 7 miles south of Letchworth State Park, moving east at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Dansville, Letchworth State Park, Belfast, Portageville, Houghton,
Caneadea, Nunda, Pike, Ossian and Canaseraga.
This includes Interstate 390 between exits 4 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is an EXTREMELY DANGEROUS SITUATION. This storm has previously
produced widespread wind damage across Chautauqua and Cattaraugus
counties. SEEK SHELTER NOW inside a sturdy structure and stay away
from windows.
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 4267 7773 4253 7769 4253 7772 4241 7773
4236 7773 4233 7819 4249 7814 4258 7824
TIME...MOT...LOC 1930Z 264DEG 38KT 4254 7797
HAIL...0.75IN
WIND...60MPH
$$
FriesThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 4:20 AM EDT | Small Craft Advisory | BUF | 16 hr | |
| Jul 29, 10:06 AM EDT | Special Weather Statement | BUF | Erie | 54 min |
| Jul 29, 10:51 AM EDT | Special Weather Statement | BUF | Genesee | 54 min |
| Jul 29, 10:55 AM EDT | Special Marine Warning | BUF | 23 min | |
| Jul 29, 11:35 AM EDT | Special Weather Statement | BUF | Livingston | 55 min |
| Jul 29, 11:51 AM EDT | Special Weather Statement | BUF | Wyoming | 54 min |
| Jul 29, 12:21 PM EDT | Special Weather Statement | BUF | Wyoming | 39 min |
| Jul 29, 12:26 PM EDT | Special Weather Statement | BUF | Ontario | 34 min |
| Jul 29, 1:09 PM EDT | Special Weather Statement | BUF | Livingston | 36 min |
| Jul 29, 1:19 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Livingston, Ontario | 41 min |
| Jul 29, 1:28 PM EDT | Severe Thunderstorm Warning | BUF | Chautauqua | 62 min |
| Jul 29, 1:48 PM EDT | Special Marine Warning | BUF | 42 min | |
| Jul 29, 2:10 PM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua | 65 min |
| Jul 29, 2:13 PM EDT | Special Weather Statement | BUF | Erie | 32 min |
| Jul 29, 2:25 PM EDT | Special Marine Warning | BUF | 50 min | |
| Jul 29, 2:53 PM EDT | Special Weather Statement | BUF | Erie, Wyoming | 52 min |
| Jul 29, 3:27 PM EDT | Severe Thunderstorm Warning | BUF | Livingston, Wyoming | 48 min |
| Jul 29, 3:41 PM EDT | Severe Thunderstorm Warning | BUF | Livingston, Ontario | 64 min |
| Jul 29, 3:45 PM EDT | Severe Thunderstorm Warning | BUF | Allegany, Livingston, Ontario | 45 min |
| Jul 29, 4:15 PM EDT | Special Weather Statement | BUF | Monroe | 45 min |
| Jul 29, 4:20 PM EDT | Severe Thunderstorm Warning | BUF | Cayuga, Ontario, Wayne | 40 min |
| Jul 29, 4:40 PM EDT | Severe Thunderstorm Warning | BUF | Monroe, Wayne | 38 min |
| Jul 29, 4:56 PM EDT | Severe Thunderstorm Warning | BUF | Cayuga, Oswego, Wayne | 64 min |
| Jul 29, 5:35 PM EDT | Special Weather Statement | BUF | Genesee | 25 min |
| Jul 29, 5:42 PM EDT | Severe Thunderstorm Warning | BUF | Genesee, Orleans | 48 min |
| Jul 29, 6:34 PM EDT | Special Weather Statement | BUF | Livingston | 26 min |
| Jul 29, 6:37 PM EDT | Severe Thunderstorm Warning | BUF | Genesee, Livingston, Monroe, Ontario | 51 min |
| Jul 29, 6:41 PM EDT | Severe Thunderstorm Warning | BUF | Genesee, Orleans | 34 min |
| Jul 29, 6:50 PM EDT | Tornado Warning | BUF | Livingston, Monroe, Ontario | 28 min |
Nearby
Severe Thunderstorm Warnings in New York, 2020Every severe thunderstorm warning in 2020
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.