Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 10, NWS Buffalo, NY

May 1, 20175 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 1, 2017, 4:24 PM EDT for 5 counties in New York. It was in force for 51 min. 7 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: May 1, 2017, 4:24 PM EDT (20:24 UTC)
Expired: May 1, 2017, 5:15 PM EDT
In force: 51 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Genesee County, NY, Livingston County, NY, Monroe County, NY, Orleans County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 74 km from the middle of the area, began a volume at 20:26 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
May 1, 4:24 PM EDT	TSTM WND DMG	Holley, NY	TREES AND WIRES DOWN.
May 1, 4:26 PM EDT	TSTM WND DMG	Kendall, NY	TREES AND WIRES DOWN.
May 1, 4:42 PM EDT	TSTM WND DMG	5 E Spencerport, NY	LARGE TREE DOWN... BEECHCRAFT DRIVE GATES NY.
May 1, 4:42 PM EDT	TSTM WND DMG	5 E Spencerport, NY	TREE DOWN ON HOUSE... GATES NY TARWOOD DRIVE.
May 1, 4:45 PM EDT	TSTM WND DMG	5 E Spencerport, NY	TREE DOWN... GATES NY PASSADENA DRIVE.
May 1, 4:45 PM EDT	TSTM WND DMG	Portageville, NY	TREE DOWN
May 1, 5:00 PM EDT	TSTM WND DMG	Groveland, NY	SEVERAL TREES DOWN

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
May 1, 2:12 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.4 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.

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: 1242 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

352 
WUUS51 KBUF 012024
SVRBUF
NYC037-051-055-073-121-012115-
/O.NEW.KBUF.SV.W.0010.170501T2024Z-170501T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
424 PM EDT MON MAY 1 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Eastern Wyoming County in western New York...
  Livingston County in western New York...
  Eastern Orleans County in western New York...
  Monroe County in western New York...
  Eastern Genesee County in western New York...

* Until 515 PM EDT.

* At 423 PM EDT, severe thunderstorms were located along a line
  extending from Holley to near Le Roy to Warsaw, moving east at 65
  mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Rochester, Greece, Irondequoit, Chili, Brockport, Geneseo, Hilton
  and Brighton.

This includes the following highways...
 Interstate 390 between exits 6 and 12.
 Interstate 90 between exits 47 and 46.

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.

&&

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4252 7809 4301 7800 4340 7814 4341 7810
      4341 7799 4339 7775 4328 7754 4330 7747
      4326 7744 4257 7774
TIME...MOT...LOC 2023Z 269DEG 58KT 4324 7805 4302 7796 4272 7811 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HITCHCOCK

2 follow-up statements

091 
WWUS51 KBUF 012054
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
454 PM EDT MON MAY 1 2017

NYC073-012103-
/O.CAN.KBUF.SV.W.0010.000000T0000Z-170501T2115Z/
Orleans NY-
454 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ORLEANS COUNTY IS
CANCELLED...

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

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4252 7809 4297 7800 4337 7772 4328 7754
      4330 7747 4326 7744 4257 7774
TIME...MOT...LOC 2053Z 284DEG 34KT 4325 7741 4305 7751 4295 7767 4252
7796

$$

NYC037-051-055-121-012115-
/O.CON.KBUF.SV.W.0010.000000T0000Z-170501T2115Z/
Wyoming NY-Livingston NY-Monroe NY-Genesee NY-
454 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR EASTERN WYOMING...LIVINGSTON...MONROE AND SOUTHEASTERN GENESEE
COUNTIES...

At 453 PM EDT, severe thunderstorms were located along a line
extending from near Webster to near East Rochester to near Honeoye
Falls to near Portageville, moving east at 40 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Rochester, Greece, Irondequoit, Chili, Geneseo, Hilton, Brighton and
Gates-North Gates.

This includes the following highways...
 Interstate 390 between exits 6 and 12.
 Interstate 90 near exit 46.

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.

&&

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4252 7809 4297 7800 4337 7772 4328 7754
      4330 7747 4326 7744 4257 7774
TIME...MOT...LOC 2053Z 284DEG 34KT 4325 7741 4305 7751 4295 7767 4252
7796

HAIL...<.75IN
WIND...70MPH
 
$$

JJR

538 
WWUS51 KBUF 012118
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
518 PM EDT MON MAY 1 2017

NYC037-051-055-121-012126-
/O.EXP.KBUF.SV.W.0010.000000T0000Z-170501T2115Z/
Wyoming NY-Livingston NY-Monroe NY-Genesee NY-
518 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WYOMING...
LIVINGSTON...MONROE AND SOUTHEASTERN GENESEE COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire.

A tornado watch remains in effect until 1000 PM EDT for western New
York.

Remember, a Severe Thunderstorm Warning still remains in effect for
Eastern Livingston and Southeastern Monroe counties until 545 pm.

LAT...LON 4252 7809 4297 7800 4337 7772 4328 7754
      4330 7747 4326 7744 4257 7774
TIME...MOT...LOC 2116Z 269DEG 58KT 4325 7691 4306 7701 4296 7717 4253
7746

$$

JJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 8:20 PM EDT	Special Weather Statement	BUF	Ontario	40 min
Apr 30, 9:57 PM EDT	Special Weather Statement	BUF	Niagara	48 min
Apr 30, 10:09 PM EDT	Special Marine Warning	BUF		81 min
Apr 30, 10:34 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	41 min
May 1, 3:45 AM EDT	Lakeshore Flood Warning	BUF	Cayuga, Jefferson, Oswego, Wayne	60 hr
May 1, 6:16 AM EDT	Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	13 hr
May 1, 2:10 PM EDT	Special Marine Warning	BUF		95 min
May 1, 2:20 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	55 min
May 1, 2:40 PM EDT	Special Marine Warning	BUF		65 min
May 1, 2:41 PM EDT	Special Marine Warning	BUF		64 min
May 1, 3:00 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	60 min
May 1, 3:06 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	54 min
May 1, 3:26 PM EDT	Special Marine Warning	BUF		94 min
May 1, 3:47 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans, Wyoming	58 min
May 1, 3:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	55 min
May 1, 4:16 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Orleans, Wyoming	14 min
May 1, 4:28 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	62 min
May 1, 4:45 PM EDT	Areal Flood Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 5 more	3 hr
May 1, 4:49 PM EDT	Special Marine Warning	BUF		116 min
May 1, 4:52 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	53 min
May 1, 5:18 PM EDT	Small Craft Advisory	BUF		47 hr
May 1, 5:36 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	54 min
May 1, 5:38 PM EDT	Special Marine Warning	BUF		97 min
May 1, 5:46 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	59 min
May 1, 6:09 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	66 min
May 1, 6:45 PM EDT	Special Marine Warning	BUF		60 min

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.