Alert archive / New York / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 83, NWS Buffalo, NY

July 21, 2026Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 21, 2026, 5:32 PM EDT for Chautauqua County, New York. It was in force for 58 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: Jul 21, 2026, 5:32 PM EDT (21:32 UTC)
Expired: Jul 21, 2026, 6:30 PM EDT
In force: 58 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), 107 km from the middle of the area, began a volume at 21:35 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, 9.5 hours before the alert went out and 107 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 300 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1133 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

473 
WUUS51 KBUF 212132
SVRBUF
NYC013-212230-
/O.NEW.KBUF.SV.W.0083.260721T2132Z-260721T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
Issued by National Weather Service Cleveland OH
532 PM EDT Tue Jul 21 2026

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Chautauqua County in western New York...

* Until 630 PM EDT.

* At 530 PM EDT, a severe thunderstorm was located over North East,
  or 12 miles northeast of Erie, moving east at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Jamestown, Lakewood, Falconer, Mayville, Clymer, Long Point State
  Park, Jamestown West, Chautauqua Institution, Findley Lake, and
  Frewsburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4227 7976 4228 7973 4228 7963 4225 7906
      4200 7906 4200 7976
TIME...MOT...LOC 2130Z 276DEG 49KT 4221 7987 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Sullivan

3 follow-up statements

823 
WWUS51 KBUF 212147
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
547 PM EDT Tue Jul 21 2026

NYC013-212230-
/O.CON.KBUF.SV.W.0083.000000T0000Z-260721T2230Z/
Chautauqua NY-
547 PM EDT Tue Jul 21 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR CHAUTAUQUA COUNTY...

At 546 PM EDT, a severe thunderstorm was located near Chautauqua
Institution, or 17 miles west of Jamestown, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Jamestown, Lakewood, Falconer, Mayville, Clymer, Long Point State
Park, Jamestown West, Chautauqua Institution, Findley Lake, and
Frewsburg.

This includes the following highways...
 Interstate 90 near exit 61.
 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.

If on or near Chautauqua Lake, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4227 7976 4228 7973 4228 7963 4225 7906
      4200 7906 4200 7976
TIME...MOT...LOC 2146Z 276DEG 49KT 4219 7957 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fries

193 
WWUS51 KBUF 212211
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
611 PM EDT Tue Jul 21 2026

NYC013-212230-
/O.CON.KBUF.SV.W.0083.000000T0000Z-260721T2230Z/
Chautauqua NY-
611 PM EDT Tue Jul 21 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SOUTHERN CHAUTAUQUA COUNTY...

At 611 PM EDT, a severe thunderstorm was located near Lakewood, or 9
miles west of Jamestown, moving southeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Jamestown, Lakewood, Falconer, Clymer, Long Point State Park,
Jamestown West, Frewsburg, Busti, Celoron, and Panama.

This includes Interstate 86 between exits 8 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 4213 7951 4222 7938 4215 7906 4200 7906
      4200 7976 4204 7976
TIME...MOT...LOC 2211Z 296DEG 30KT 4208 7942 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fries

382 
WWUS51 KBUF 212230
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
630 PM EDT Tue Jul 21 2026

NYC013-212240-
/O.EXP.KBUF.SV.W.0083.000000T0000Z-260721T2230Z/
Chautauqua NY-
630 PM EDT Tue Jul 21 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHAUTAUQUA COUNTY HAS
EXPIRED...

The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

&&

LAT...LON 4213 7951 4222 7938 4215 7906 4200 7906
      4200 7976 4204 7976
TIME...MOT...LOC 2230Z 276DEG 49KT 4206 7912 

$$

Brothers

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 9:08 AM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	67 min
Jul 21, 9:47 AM EDT	Special Marine Warning	BUF		58 min
Jul 21, 9:58 AM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	46 min
Jul 21, 11:17 AM EDT	Special Marine Warning	BUF		38 min
Jul 21, 11:45 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	29 min
Jul 21, 1:26 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	28 min
Jul 21, 1:29 PM EDT	Special Marine Warning	BUF		61 min
Jul 21, 2:05 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	55 min
Jul 21, 2:58 PM EDT	Flash Flood Warning	BUF	Erie, Niagara	5 hr
Jul 21, 5:41 PM EDT	Beach Hazards Statement	BUF	Cayuga, Jefferson, Monroe, Niagara, Orleans, Oswego and 1 more	32 hr
Jul 21, 5:51 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Ontario, Wayne	54 min
Jul 21, 6:14 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wyoming	76 min
Jul 21, 7:58 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	31 min

Nearby

Severe Thunderstorm Warnings in New York, 2026 Every severe thunderstorm warning in 2026

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.