Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Buffalo, NY

July 13, 20214 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 13, 2021, 9:25 PM EDT for 4 counties in New York. It was in force for 65 min. 3 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 13, 2021, 9:25 PM EDT (01:25 UTC)
Expired: Jul 13, 2021, 10:30 PM EDT
In force: 65 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Cayuga County, NY, Jefferson County, NY, Lewis County, NY, Oswego County, NY

The radar

The Ft Drum radar (KTYX), 44 km from the middle of the area, began a volume at 01:27 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 13, 9:50 PM EDT	TSTM WND DMG	3 Sse Parish, NY	ABOUT 20 TREES DOWN ON SMITH RD. NEAR CR 84 IN THE TOWN OF HASTINGS. TIME ESTIMATED BY RADAR.
Jul 13, 9:50 PM EDT	TSTM WND DMG	Parish, NY	TREES DOWN IN THE TOWN OF PARISH. TIME ESTIMATED BY RADAR.
Jul 13, 10:30 PM EDT	TSTM WND DMG	1 Ene Osceola, NY	TREES AND WIRES DOWN ON OSCEOLA RD.

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 13, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 1.4 hours before the alert went out and 217 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -60 m²/s²
0-3 km storm-relative helicity: -49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

797 
WUUS51 KBUF 140125
SVRBUF
NYC011-045-049-075-140230-
/O.NEW.KBUF.SV.W.0073.210714T0125Z-210714T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
925 PM EDT Tue Jul 13 2021

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Jefferson County in central New York...
  Southwestern Lewis County in central New York...
  Cayuga County in central New York...
  Oswego County in central New York...

* Until 1030 PM EDT..

* At 924 PM EDT, severe thunderstorms were located along a line
  extending from 25 miles west of Cedar Point State Park to 9 miles
  southwest of Southwick Beach State Park to near Skaneateles, moving
  northeast at 40 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Watertown, Oswego, Fulton, Fort Drum, Sandy Island Beach State
  Park, Stony Point, Carthage, Pulaski, West Carthage and Clayton.

 This includes the following highways...
 Interstate 90 near exit 40.
 Interstate 81 between exits 32 and 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4403 7554 4345 7565 4348 7581 4315 7588
      4327 7620 4320 7621 4324 7626 4323 7648
      4303 7649 4303 7660 4334 7663 4351 7653
      4358 7626 4387 7635 4387 7650 4395 7644
      4396 7634 4410 7642 4429 7615 4440 7583
TIME...MOT...LOC 0124Z 239DEG 33KT 4419 7671 4370 7636 4296 7649 

HAIL...1.00IN
WIND...70MPH
 
$$

Mitchell

1 follow-up statement

508 
WWUS51 KBUF 140210
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1010 PM EDT Tue Jul 13 2021

NYC011-140219-
/O.CAN.KBUF.SV.W.0073.000000T0000Z-210714T0230Z/
Cayuga NY-
1010 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR CAYUGA COUNTY IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central New York.

LAT...LON 4403 7554 4345 7565 4348 7581 4333 7589
      4332 7586 4315 7588 4327 7620 4354 7639
      4358 7626 4378 7629 4387 7635 4387 7650
      4395 7644 4396 7634 4410 7642 4421 7627
      4424 7617 4429 7615 4440 7583
TIME...MOT...LOC 0209Z 233DEG 47KT 4420 7582 4382 7592 4331 7591 

$$

NYC045-049-075-140230-
/O.CON.KBUF.SV.W.0073.000000T0000Z-210714T0230Z/
Jefferson NY-Lewis NY-Oswego NY-
1010 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR JEFFERSON...SOUTHWESTERN LEWIS AND OSWEGO COUNTIES...

At 1009 PM EDT, severe thunderstorms were located along a line
extending from 6 miles south of Redwood to near Adams Center to 8
miles west of Camden, moving northeast at 55 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Watertown, Sandy Island Beach State Park, Fort Drum, Stony Point,
Carthage, Pulaski, West Carthage, Clayton, Central Square and Adams.

 This includes Interstate 81 between exits 32 and 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 4403 7554 4345 7565 4348 7581 4333 7589
      4332 7586 4315 7588 4327 7620 4354 7639
      4358 7626 4378 7629 4387 7635 4387 7650
      4395 7644 4396 7634 4410 7642 4421 7627
      4424 7617 4429 7615 4440 7583
TIME...MOT...LOC 0209Z 233DEG 47KT 4420 7582 4382 7592 4331 7591 

HAIL...0.75IN
WIND...70MPH
 
$$

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:00 PM EDT	Special Marine Warning	BUF		45 min
Jul 13, 8:04 PM EDT	Areal Flood Warning	BUF	Monroe	3 hr
Jul 13, 8:04 PM EDT	Special Weather Statement	BUF	Jefferson	41 min
Jul 13, 8:16 PM EDT	Special Weather Statement	BUF	Ontario, Wayne	44 min
Jul 13, 8:28 PM EDT	Special Marine Warning	BUF		2 hr
Jul 13, 8:35 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	55 min
Jul 13, 9:03 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Wayne	27 min
Jul 13, 9:38 PM EDT	Special Marine Warning	BUF		82 min
Jul 13, 10:17 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	73 min
Jul 14, 4:07 AM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua, Erie	3 hr
Jul 14, 5:45 AM EDT	Special Weather Statement	BUF	Wyoming	60 min
Jul 14, 7:15 AM EDT	Areal Flood Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Wyoming	3 hr
Jul 14, 2:16 PM EDT	Special Weather Statement	BUF	Niagara	59 min
Jul 14, 3:26 PM EDT	Special Weather Statement	BUF	Genesee	49 min
Jul 14, 5:03 PM EDT	Special Weather Statement	BUF	Ontario	57 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every 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.