Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 81, NWS Buffalo, NY

July 23, 2017Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 23, 2017, 3:28 PM EDT for Ontario County, New York. It was in force for 62 min. 1 report 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 23, 2017, 3:28 PM EDT (19:28 UTC)
Expired: Jul 23, 2017, 4:30 PM EDT
In force: 62 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Ontario County, NY

The radar

The Buffalo radar (KBUF), 118 km from the middle of the area, began a volume at 19:29 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 23, 3:35 PM EDT	TSTM WND DMG	6 S Canandaigua, NY	TREES/WIRES DOWN IN CRYSTAL BEACH.

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, 7.5 hours before the alert went out and 115 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: 1092 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

017 
WUUS51 KBUF 231928
SVRBUF
NYC069-232030-
/O.NEW.KBUF.SV.W.0081.170723T1928Z-170723T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
328 PM EDT SUN JUL 23 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Central Ontario County in western New York...

* Until 430 PM EDT.

* At 327 PM EDT, a severe thunderstorm was located over Canandaigua,
  moving southeast at 10 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect wind damage to trees and power lines. 

* Locations impacted include...
  Canandaigua, Bristol, Rushville, Gorham, Cottage City and Cheshire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Canandaigua 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.

&&

LAT...LON 4286 7743 4295 7723 4276 7704 4276 7731
      4273 7734 4269 7736
TIME...MOT...LOC 1927Z 331DEG 7KT 4285 7729 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Wood

3 follow-up statements

314 
WWUS51 KBUF 232001
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
401 PM EDT SUN JUL 23 2017

NYC069-232030-
/O.CON.KBUF.SV.W.0081.000000T0000Z-170723T2030Z/
Ontario NY-
401 PM EDT SUN JUL 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHEASTERN ONTARIO COUNTY...

At 400 PM EDT, a severe thunderstorm was located near Ferguson
Corners, or 8 miles southeast of Canandaigua, moving southeast at 15
mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect wind damage to trees and power lines. 

Locations impacted include...
Canandaigua, Rushville, Gorham and Cottage City. 

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 4276 7728 4290 7726 4295 7723 4276 7704
TIME...MOT...LOC 2000Z 303DEG 11KT 4282 7714 

HAIL...0.75IN
WIND...60MPH
 
$$

Wood

803 
WWUS51 KBUF 232008
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
408 PM EDT SUN JUL 23 2017

NYC069-232030-
/O.CON.KBUF.SV.W.0081.000000T0000Z-170723T2030Z/
Ontario NY-
408 PM EDT SUN JUL 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL ONTARIO COUNTY...

At 408 PM EDT, a severe thunderstorm was located near Ferguson
Corners, or 8 miles southwest of Geneva, moving southeast at 10 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect wind damage to trees and power lines. 

Locations impacted include...
Rushville and Gorham. 

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 4276 7724 4285 7722 4289 7717 4276 7704
TIME...MOT...LOC 2008Z 331DEG 7KT 4281 7713 

HAIL...0.75IN
WIND...60MPH
 
$$

Wood

177 
WWUS51 KBUF 232030
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
430 PM EDT SUN JUL 23 2017

NYC069-232040-
/O.EXP.KBUF.SV.W.0081.000000T0000Z-170723T2030Z/
Ontario NY-
430 PM EDT SUN JUL 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ONTARIO COUNTY
HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been allowed to expire.

LAT...LON 4276 7724 4285 7722 4289 7717 4276 7704
TIME...MOT...LOC 2030Z 331DEG 7KT 4281 7713 

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 4:31 AM EDT	Beach Hazards Statement	BUF	Monroe, Niagara, Orleans	18 hr
Jul 23, 4:31 AM EDT	Lakeshore Flood Watch	BUF	Monroe, Niagara, Orleans	5 hr
Jul 23, 4:32 AM EDT	Small Craft Advisory	BUF		24 hr
Jul 23, 9:57 AM EDT	Lakeshore Flood Warning	BUF	Monroe, Orleans	19 hr
Jul 23, 1:34 PM EDT	Special Weather Statement	BUF	Allegany	56 min
Jul 23, 2:12 PM EDT	Special Weather Statement	BUF	Ontario	63 min
Jul 23, 2:22 PM EDT	Special Weather Statement	BUF	Allegany	53 min
Jul 23, 2:34 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	56 min
Jul 23, 2:59 PM EDT	Tornado Warning	BUF	Ontario	31 min
Jul 23, 3:30 PM EDT	Special Weather Statement	BUF	Genesee	60 min
Jul 23, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Wyoming	41 min
Jul 23, 3:57 PM EDT	Flash Flood Warning	BUF	Ontario	3 hr
Jul 23, 4:15 PM EDT	Flash Flood Warning	BUF	Genesee, Wyoming	3 hr
Jul 23, 4:38 PM EDT	Special Weather Statement	BUF	Livingston	67 min
Jul 23, 4:59 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario	4 hr
Jul 23, 5:32 PM EDT	Special Weather Statement	BUF	Niagara	88 min
Jul 23, 6:13 PM EDT	Special Marine Warning	BUF		62 min
Jul 23, 6:53 PM EDT	Areal Flood Warning	BUF	Ontario	12 hr

Nearby

Severe Thunderstorm Warnings in New York, 2017 Every severe thunderstorm warning in 2017

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.