Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 18, NWS Buffalo, NY
NWS Buffalo, NY issued this severe thunderstorm warning at Jun 20, 2021, 6:40 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2021, 6:40 PM EDT (22:40 UTC)
- Expired
- Jun 20, 2021, 7:15 PM EDT
- In force
- 35 min
- Issued by
- NWS Buffalo, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cattaraugus County, NY, Chautauqua County, NY
The radar
The Buffalo radar (KBUF), 62 km from the middle of the area, began a volume at 22:42 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.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.7 hours before the alert went out and 61 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
- 926 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
584
WUUS51 KBUF 202240
SVRBUF
NYC009-013-202315-
/O.NEW.KBUF.SV.W.0018.210620T2240Z-210620T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
640 PM EDT Sun Jun 20 2021
The National Weather Service in Buffalo has issued a
* Severe Thunderstorm Warning for...
Northwestern Cattaraugus County in western New York...
Northeastern Chautauqua County in western New York...
* Until 715 PM EDT..
* At 639 PM EDT, a severe thunderstorm was located 11 miles southeast
of Fredonia, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Gowanda, Silver Creek, Stockton, Dayton, Ellington, Leon,
Arkwright, Forestville, Cassadaga and South Dayton.
This includes Interstate 90 near exit 58.
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 4232 7940 4257 7913 4257 7911 4254 7906
4254 7903 4253 7900 4249 7896 4248 7896
4245 7892 4244 7888 4241 7884 4216 7918
TIME...MOT...LOC 2239Z 220DEG 21KT 4231 7921
HAIL...0.75IN
WIND...60MPH
$$
Mitchell2 follow-up statements
195
WWUS51 KBUF 202305
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
705 PM EDT Sun Jun 20 2021
NYC009-013-202315-
/O.CON.KBUF.SV.W.0018.000000T0000Z-210620T2315Z/
Cattaraugus NY-Chautauqua NY-
705 PM EDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHWESTERN CATTARAUGUS AND NORTHEASTERN CHAUTAUQUA COUNTIES...
At 704 PM EDT, a severe thunderstorm was located 7 miles west of
Gowanda, or 12 miles east of Fredonia, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Gowanda, Silver Creek, Dayton, Leon, Arkwright, Forestville, South
Dayton, Cherry Creek, Perrysburg and Hamlet.
This includes Interstate 90 near exit 58.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4257 7913 4257 7911 4254 7906 4254 7903
4253 7900 4249 7896 4248 7896 4245 7892
4244 7888 4241 7884 4225 7905 4238 7934
TIME...MOT...LOC 2304Z 220DEG 21KT 4242 7908
HAIL...0.75IN
WIND...60MPH
$$
Mitchell806
WWUS51 KBUF 202314
SVSBUF
Severe Weather Statement
National Weather Service Buffalo NY
714 PM EDT Sun Jun 20 2021
NYC009-013-202323-
/O.EXP.KBUF.SV.W.0018.000000T0000Z-210620T2315Z/
Cattaraugus NY-Chautauqua NY-
714 PM EDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CATTARAUGUS AND
NORTHEASTERN CHAUTAUQUA COUNTIES WILL EXPIRE AT 715 PM EDT...
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 will be allowed to expire.
LAT...LON 4257 7913 4257 7911 4254 7906 4254 7903
4253 7900 4249 7896 4248 7896 4245 7892
4244 7888 4241 7884 4225 7905 4238 7934
TIME...MOT...LOC 2313Z 220DEG 21KT 4246 7903
$$
MitchellThe office that day
Everything else NWS Buffalo, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 8:52 PM EDT | Special Weather Statement | BUF | Oswego | 53 min |
| Jun 19, 9:51 PM EDT | Areal Flood Warning | BUF | Oswego | 2 hr |
| Jun 19, 10:00 PM EDT | Special Weather Statement | BUF | Oswego | 60 min |
| Jun 20, 2:44 PM EDT | Wind Advisory | BUF | Erie, Genesee, Niagara, Orleans | 25 hr |
| Jun 20, 3:30 PM EDT | Special Weather Statement | BUF | Cattaraugus | 45 min |
| Jun 20, 3:57 PM EDT | Special Weather Statement | BUF | Cattaraugus | 48 min |
| Jun 20, 4:30 PM EDT | Small Craft Advisory | BUF | 57 hr | |
| Jun 20, 6:23 PM EDT | Special Weather Statement | BUF | Chautauqua | 52 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.