Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 27, NWS Burlington, VT

July 13, 2021St. Lawrence County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 13, 2021, 7:27 PM EDT for St. Lawrence County, New York. It was in force for 48 min. 2 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: Jul 13, 2021, 7:27 PM EDT (23:27 UTC)
Expired: Jul 13, 2021, 8:15 PM EDT
In force: 48 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County St. Lawrence County, NY

The radar

The Ft Drum radar (KTYX), 82 km from the middle of the area, began a volume at 23:28 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 13, 7:35 PM EDT	TSTM WND DMG	Morristown, NY	TREE, BRACNHES AND UTILITY LINES DOWNED BY THUNDERSTORM WINDS.
Jul 13, 7:50 PM EDT	TSTM WND DMG	Ogdensburg, NY	BRANCHES/TREE ON UTILITY LINES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 11.5 hours before the alert went out and 251 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: 614 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

598 
WUUS51 KBTV 132327
SVRBTV
NYC089-140015-
/O.NEW.KBTV.SV.W.0027.210713T2327Z-210714T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
727 PM EDT Tue Jul 13 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  West central St. Lawrence County in northern New York...

* Until 815 PM EDT.

* At 727 PM EDT, a severe thunderstorm was located over Chippewa Bay,
  moving northeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and powerlines.

* Locations impacted include...
  Ogdensburg, Edwardsville, Hammond, Morristown, Rossie, Jacques
  Cartier State Park, Chippewa Bay, South Hammond, Nelson Corner and
  North Hammond.

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 4441 7579 4442 7579 4442 7581 4443 7577
      4444 7579 4444 7577 4445 7576 4445 7578
      4447 7577 4447 7579 4451 7575 4471 7547
      4474 7545 4475 7541 4472 7533 4432 7567
      4439 7584 4441 7584
TIME...MOT...LOC 2327Z 205DEG 23KT 4444 7573 

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

SLW

1 follow-up statement

084 
WWUS51 KBTV 132352
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
752 PM EDT Tue Jul 13 2021

NYC089-140015-
/O.CON.KBTV.SV.W.0027.000000T0000Z-210714T0015Z/
St. Lawrence NY-
752 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR WEST CENTRAL ST. LAWRENCE COUNTY...

At 751 PM EDT, a severe thunderstorm was located over Jacques Cartier
State Park, moving northeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Ogdensburg, Edwardsville, Hammond, Morristown, Rossie, Jacques
Cartier State Park, Chippewa Bay, South Hammond, Nelson Corner and
North Hammond.

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 4441 7579 4442 7579 4442 7581 4443 7577
      4444 7579 4444 7577 4445 7576 4445 7578
      4447 7577 4447 7579 4451 7575 4471 7547
      4474 7545 4475 7541 4472 7533 4432 7567
      4439 7584 4441 7584
TIME...MOT...LOC 2351Z 205DEG 23KT 4455 7566 

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

SLW

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 5:06 PM EDT	Special Weather Statement	BTV	St. Lawrence	54 min
Jul 13, 6:03 PM EDT	Special Weather Statement	BTV	St. Lawrence	87 min
Jul 13, 6:22 PM EDT	Special Weather Statement	BTV	Franklin	53 min
Jul 13, 6:49 PM EDT	Special Weather Statement	BTV	St. Lawrence	56 min
Jul 13, 7:10 PM EDT	Severe Thunderstorm Warning	BTV	St. Lawrence	65 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

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.