Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 44, NWS Buffalo, NY

August 7, 2018Jefferson County, Lewis County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 7, 2018, 4:35 AM EDT for Jefferson County, Lewis County, New York. It was in force for 55 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 7, 2018, 4:35 AM EDT (08:35 UTC)
Expired: Aug 7, 2018, 5:30 AM EDT
In force: 55 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Jefferson County, NY, Lewis County, NY

The radar

The Ft Drum radar (KTYX), 52 km from the middle of the area, began a volume at 08:37 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 7, 4:58 AM EDT	TSTM WND DMG	2 Nnw Smithville, NY	LARGE TREE DOWN ACROSS RIDGE RD BETWEEN ROUTE 3 AND ROUTE 75

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 00:00Z, 8.6 hours before the alert went out and 237 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: 546 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1305 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

224 
WUUS51 KBUF 070835
SVRBUF
NYC045-049-070930-
/O.NEW.KBUF.SV.W.0044.180807T0835Z-180807T0930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
435 AM EDT TUE AUG 7 2018

The National Weather Service in Buffalo has issued a

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

* Until 530 AM EDT..

* At 434 AM EDT, severe thunderstorms were located along a line
  extending from 13 miles northwest of Henderson Harbor to 7 miles
  southwest of Stony Point, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Watertown, Fort Drum, Stony Point, Clayton, Adams, Dexter, Glen
  Park and Redwood.
 
This includes Interstate 81 between exits 39 and 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Damaging winds and continuous 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.

&&

LAT...LON 4418 7570 4377 7573 4366 7626 4378 7629
      4383 7636 4387 7635 4384 7644 4385 7646
      4395 7645 4396 7634 4402 7636 4405 7642
      4410 7643 4414 7635 4420 7629 4422 7619
      4429 7615 4435 7601 4435 7595 4440 7586
TIME...MOT...LOC 0834Z 244DEG 33KT 4403 7634 4375 7637 

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

Hitchcock

2 follow-up statements

414 
WWUS51 KBUF 070904
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
504 AM EDT TUE AUG 7 2018

NYC045-049-070930-
/O.CON.KBUF.SV.W.0044.000000T0000Z-180807T0930Z/
Jefferson NY-Lewis NY-
504 AM EDT TUE AUG 7 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM EDT
FOR JEFFERSON AND WEST CENTRAL LEWIS COUNTIES...

At 503 AM EDT, severe thunderstorms were located along a line
extending from 8 miles southeast of Clayton to near Glen Park to near
Adams, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Watertown, Fort Drum, Clayton, Adams, Dexter, Glen Park, Redwood and
Kring Point State Park.

This includes Interstate 81 between exits 39 and 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous 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.

&&

LAT...LON 4440 7586 4418 7570 4377 7573 4366 7626
      4429 7615 4435 7601 4434 7597
TIME...MOT...LOC 0903Z 266DEG 44KT 4415 7597 4402 7590 4378 7607 

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

Hitchcock

017 
WWUS51 KBUF 070931
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
531 AM EDT TUE AUG 7 2018

NYC045-049-070940-
/O.EXP.KBUF.SV.W.0044.000000T0000Z-180807T0930Z/
Jefferson NY-Lewis NY-
531 AM EDT TUE AUG 7 2018

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON AND WEST CENTRAL
LEWIS COUNTIES 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.

The line of thunderstorms will produce locally heavy downpours and 
wind gusts up to 35 mph across eastern Jefferson County.

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

LAT...LON 4440 7586 4418 7570 4377 7573 4366 7626
      4429 7615 4435 7601 4434 7597
TIME...MOT...LOC 0930Z 244DEG 33KT 4426 7566 4413 7559 4389 7576 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 3:55 AM EDT	Special Marine Warning	BUF		65 min
Aug 7, 4:14 AM EDT	Special Weather Statement	BUF	Jefferson	61 min
Aug 7, 4:46 AM EDT	Special Marine Warning	BUF		46 min
Aug 7, 7:47 AM EDT	Special Weather Statement	BUF	Niagara	43 min
Aug 7, 11:50 AM EDT	Special Weather Statement	BUF	Jefferson	55 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.