Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 99, NWS Buffalo, NY

August 4, 2017Jefferson County, Lewis County, Oswego County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2017, 5:51 PM EDT for Jefferson County, Lewis County, Oswego County, New York. It was in force for 54 min. 4 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: Aug 4, 2017, 5:51 PM EDT (21:51 UTC)
Expired: Aug 4, 2017, 6:45 PM EDT
In force: 54 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Ft Drum radar (KTYX), 27 km from the middle of the area, began a volume at 21:53 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
Aug 4, 5:53 PM EDT	TSTM WND DMG	Adams, NY	TREES DOWN IN ADAMS. TIME ESTIMATED BASED ON RADAR
Aug 4, 5:55 PM EDT	TSTM WND DMG	1 N Adams, NY	MULTIPLE TREES AND WIRES DOWN ON RT 11
Aug 4, 5:55 PM EDT	HAIL 1	1 Nnw Adams, NY
Aug 4, 5:56 PM EDT	TSTM WND DMG	Ellisburg, NY	TREES AND WIRES DOWN - TIME ESTIMATED BY RADAR

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
Aug 4, 1:25 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.9 hours before the alert went out and 216 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: 160 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

974 
WUUS51 KBUF 042151
SVRBUF
NYC045-049-075-042245-
/O.NEW.KBUF.SV.W.0099.170804T2151Z-170804T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
551 PM EDT FRI AUG 4 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Eastern Jefferson County in central New York...
  West central Lewis County in central New York...
  North central Oswego County in central New York...

* Until 645 PM EDT.

* At 550 PM EDT, a severe thunderstorm was located over Sandy Island
  Beach State Park, moving northeast at 35 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to trees and power lines. 

* Locations impacted include...
  Watertown, Sandy Island Beach State Park, Fort Drum, Carthage,
  Pulaski, West Carthage, Adams and Dexter.

This includes Interstate 81 between exits 37 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4397 7544 4355 7618 4361 7626 4369 7626
      4372 7627 4376 7628 4426 7588
TIME...MOT...LOC 2150Z 223DEG 31KT 4367 7621 

HAIL...1.00IN
WIND...60MPH
 
$$

Smith

1 follow-up statement

121 
WWUS51 KBUF 042223
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
623 PM EDT FRI AUG 4 2017

NYC075-042232-
/O.CAN.KBUF.SV.W.0099.000000T0000Z-170804T2245Z/
Oswego NY-
623 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL OSWEGO COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved north 
into Jefferson County. Therefore, the warning for Oswego has been 
cancelled.

A severe thunderstorm watch remains in effect until 900 PM EDT for
central New York.

LAT...LON 4397 7544 4370 7591 4370 7594 4371 7602
      4367 7602 4367 7607 4377 7617 4426 7588
TIME...MOT...LOC 2222Z 223DEG 31KT 4387 7595 

$$

NYC045-049-042245-
/O.CON.KBUF.SV.W.0099.000000T0000Z-170804T2245Z/
Jefferson NY-Lewis NY-
623 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR CENTRAL JEFFERSON AND WEST CENTRAL LEWIS COUNTIES...

At 622 PM EDT, a cluster of severe thunderstorms was centered over 
Adams Center, or 7 miles south of Watertown, moving northeast at 35 
mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Watertown, Fort Drum, Carthage, West Carthage, Adams, Glen Park,
Herrings and Adams Center.

This includes Interstate 81 between exits 38 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4397 7544 4370 7591 4370 7594 4371 7602
      4367 7602 4367 7607 4377 7617 4426 7588
TIME...MOT...LOC 2222Z 223DEG 31KT 4387 7595 

HAIL...1.00IN
WIND...60MPH
 
$$

Smith

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 9:28 PM EDT	Small Craft Advisory	BUF		54 hr
Aug 4, 8:45 AM EDT	Special Weather Statement	BUF	Wayne	30 min
Aug 4, 8:52 AM EDT	Special Marine Warning	BUF		53 min
Aug 4, 11:40 AM EDT	Special Marine Warning	BUF		65 min
Aug 4, 11:53 AM EDT	Special Weather Statement	BUF	Wayne	37 min
Aug 4, 12:22 PM EDT	Special Marine Warning	BUF		53 min
Aug 4, 12:27 PM EDT	Severe Thunderstorm Warning	BUF	Erie	63 min
Aug 4, 12:55 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	50 min
Aug 4, 1:05 PM EDT	Severe Thunderstorm Warning	BUF	Genesee	31 min
Aug 4, 1:08 PM EDT	Special Marine Warning	BUF		52 min
Aug 4, 1:13 PM EDT	Severe Thunderstorm Warning	BUF	Niagara, Orleans	62 min
Aug 4, 1:41 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	49 min
Aug 4, 1:59 PM EDT	Special Marine Warning	BUF		61 min
Aug 4, 3:00 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	45 min
Aug 4, 3:22 PM EDT	Special Marine Warning	BUF		53 min
Aug 4, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	57 min
Aug 4, 3:42 PM EDT	Special Marine Warning	BUF		63 min
Aug 4, 4:02 PM EDT	Special Marine Warning	BUF		118 min
Aug 4, 4:14 PM EDT	Special Marine Warning	BUF		61 min
Aug 4, 4:17 PM EDT	Special Marine Warning	BUF		88 min
Aug 4, 4:26 PM EDT	Special Marine Warning	BUF		34 min
Aug 4, 4:27 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	33 min
Aug 4, 4:45 PM EDT	Special Marine Warning	BUF		2 hr
Aug 4, 4:46 PM EDT	Special Marine Warning	BUF		89 min
Aug 4, 5:00 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara	45 min
Aug 4, 5:04 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	41 min
Aug 4, 5:23 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	67 min
Aug 4, 5:39 PM EDT	Special Marine Warning	BUF		36 min
Aug 4, 6:38 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	52 min
Aug 4, 7:09 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	66 min
Aug 4, 7:15 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Oswego, Wayne	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.