Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 47, NWS Buffalo, NY

August 15, 2018Jefferson County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 15, 2018, 4:29 PM EDT for Jefferson County, New York. It was in force for 61 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: Aug 15, 2018, 4:29 PM EDT (20:29 UTC)
Expired: Aug 15, 2018, 5:30 PM EDT
In force: 61 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Jefferson County, NY

The radar

The Ft Drum radar (KTYX), 57 km from the middle of the area, began a volume at 20:31 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 15, 5:06 PM EDT	HAIL 1.5	2 Sw Fishers Landing, NY	ESTIMATED JUST SMALLER THAN A GOLF BALL, CARS DENTED. TIME ESTIMATED FROM RADAR.

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, 8.5 hours before the alert went out and 232 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: 564 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1035 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

As transmitted.

580 
WUUS51 KBUF 152029
SVRBUF
NYC045-152130-
/O.NEW.KBUF.SV.W.0047.180815T2029Z-180815T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
429 PM EDT WED AUG 15 2018

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Central Jefferson County in central New York...

* Until 530 PM EDT..

* At 429 PM EDT, a severe thunderstorm was located 10 miles west of
  Cedar Point State Park, or 29 miles northwest of Watertown, moving
  southeast at 20 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Stony Point, Clayton, Dexter, Glen Park, Henderson Harbor, Cedar
  Point State Park, Sackets Harbor and Henderson.

This includes Interstate 81 between exits 48 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4421 7570 4385 7612 4379 7629 4383 7636
      4387 7635 4384 7644 4385 7647 4391 7650
      4394 7647 4396 7644 4396 7634 4402 7636
      4405 7642 4410 7643 4414 7635 4420 7631
      4422 7619 4424 7617 4429 7615 4430 7610
TIME...MOT...LOC 2029Z 298DEG 18KT 4421 7641 

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

Church

3 follow-up statements

298 
WWUS51 KBUF 152038
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
438 PM EDT WED AUG 15 2018

NYC045-152130-
/O.CON.KBUF.SV.W.0047.000000T0000Z-180815T2130Z/
Jefferson NY-
438 PM EDT WED AUG 15 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL JEFFERSON COUNTY...

At 438 PM EDT, a severe thunderstorm was located 7 miles west of
Cedar Point State Park, or 26 miles northwest of Watertown, moving
southeast at 20 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Stony Point, Clayton, Dexter, Glen Park, Henderson Harbor, Cedar
Point State Park, Sackets Harbor and Henderson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4421 7570 4385 7612 4379 7629 4383 7636
      4387 7635 4384 7644 4385 7647 4391 7650
      4394 7647 4396 7644 4396 7634 4402 7636
      4405 7642 4410 7643 4414 7635 4420 7631
      4422 7619 4424 7617 4429 7615 4430 7610
TIME...MOT...LOC 2038Z 298DEG 18KT 4419 7635 

HAIL...1.75IN
WIND...60MPH
 
$$

Church

611 
WWUS51 KBUF 152103
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
503 PM EDT WED AUG 15 2018

NYC045-152130-
/O.CON.KBUF.SV.W.0047.000000T0000Z-180815T2130Z/
Jefferson NY-
503 PM EDT WED AUG 15 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL JEFFERSON COUNTY...

At 502 PM EDT, severe thunderstorms were located along a line
extending from Clayton to 8 miles southwest of Cedar Point State
Park, moving east at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Clayton, Dexter, Glen Park, Cedar Point State Park, Sackets Harbor,
Smithville, Brownville and Theresa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4421 7570 4385 7612 4403 7637 4405 7641
      4406 7642 4410 7643 4414 7635 4420 7631
      4420 7624 4422 7619 4424 7617 4429 7615
      4429 7614 4430 7610
TIME...MOT...LOC 2102Z 290DEG 21KT 4425 7607 4413 7632 

HAIL...1.75IN
WIND...60MPH
 
$$

Church

768 
WWUS51 KBUF 152130 RRA
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
530 PM EDT WED AUG 15 2018

NYC045-152140-
/O.EXP.KBUF.SV.W.0047.000000T0000Z-180815T2130Z/
Jefferson NY-
530 PM EDT WED AUG 15 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL JEFFERSON COUNTY HAS
EXPIRED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with these
thunderstorms.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Buffalo.

LAT...LON 4421 7570 4385 7612 4403 7637 4405 7641
      4406 7642 4410 7643 4414 7635 4420 7631
      4420 7624 4422 7619 4424 7617 4429 7615
      4429 7614 4430 7610
TIME...MOT...LOC 2130Z 298DEG 18KT 4419 7590 4407 7615 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 3:29 PM EDT	Special Weather Statement	BUF	Ontario	46 min
Aug 15, 4:19 PM EDT	Special Marine Warning	BUF		56 min
Aug 15, 4:44 PM EDT	Special Marine Warning	BUF		31 min
Aug 15, 4:48 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	42 min
Aug 15, 5:12 PM EDT	Special Marine Warning	BUF		93 min
Aug 15, 5:34 PM EDT	Special Weather Statement	BUF	Jefferson	56 min

Nearby

Severe Thunderstorm Warnings in New York, 2018 Every severe thunderstorm warning in 2018

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.