Alert archive / New York / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 34, NWS Burlington, VT

August 18, 2015St. Lawrence County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Aug 18, 2015, 6:32 PM EDT for St. Lawrence County, New York. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 18, 2015, 6:32 PM EDT (22:32 UTC)
Expired: Aug 18, 2015, 7:15 PM EDT
In force: 43 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon

County St. Lawrence County, NY

The radar

The Ft Drum radar (KTYX), 94 km from the middle of the area, began a volume at 22:31 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.5 hours before the alert went out and 226 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: 82 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1227 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Burlington, VT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:53 PM EDT, 2 hours 39 minutes earlier.

Area forecast discussion, Aug 18, 3:53 PM EDT, 2 hours 39 minutes before

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Hazardous weather outlook, Aug 18, 4:12 AM EDT, 14 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
412 AM EDT TUE AUG 18 2015

NYZ026>031-034-035-087-VTZ001>012-016>019-190815-
NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON-
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-
WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-
WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR-
EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND-
412 AM EDT TUE AUG 18 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL
VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN
VERMONT.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE BEST POTENTIAL FOR THUNDERSTORMS WILL EXIST LATE THURSDAY AND
ESPECIALLY THURSDAY NIGHT AS A SLOW MOVING COLD FRONT MOVES EAST
ACROSS THE AREA. THE SLOW EASTWARD PROGRESSION COULD LEAD TO VERY
HEAVY DOWNPOURS...MAINLY OVER PARTS OF NORTHERN NEW YORK AND
EVENTUALLY OVER BOTH NORTHERN NEW YORK AND VERMONT THURSDAY NIGHT.
GUSTY WINDS WILL ALSO BE POSSIBLE WITH ANY THUNDERSTORMS LATE
THURSDAY AND THURSDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

EVENSON

In the hours before

Special weather statement, Aug 18, 3:09 PM EDT, 3 hours 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
309 PM EDT TUE AUG 18 2015

NYZ034-182000-
WESTERN ESSEX-
309 PM EDT TUE AUG 18 2015

...A STRONG THUNDERSTORM WILL AFFECT ESSEX COUNTY NEW YORK ...

AT 308 PM EDT...A STRONG THUNDERSTORM WAS NEAR MOUNT MARCY...MOVING
NORTHEAST AT 15 MPH.

WINDS IN EXCESS OF 30 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS TO BE IMPACTED INCLUDE...
ELIZABETHTOWN...MINERVA...NEWCOMB...MOUNT MARCY...KEENE VALLEY...
NORTH ELBA...KEENE...NORTH HUDSON...ST. HUBERTS...MOUNT VAN
HOEVENBERG...TAHAWUS...UNDERWOOD...NEW RUSSIA...VANDERWHACKER
MOUNTAIN AND MOUNT VAN HOEVENBURG RECREATION AREA.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 4379 7405 4381 7410 4409 7422 4413 7419
      4414 7409 4422 7411 4431 7403 4423 7353
      4416 7352 4386 7380 4374 7406
TIME...MOT...LOC 1908Z 222DEG 12KT 4402 7394

KGM

Special weather statement, Aug 18, 6:02 PM EDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
602 PM EDT TUE AUG 18 2015

NYZ029-087-182300-
SOUTHEASTERN ST. LAWRENCE-SOUTHWESTERN ST. LAWRENCE-
602 PM EDT TUE AUG 18 2015

...A STRONG THUNDERSTORM WILL AFFECT PORTIONS OF SOUTHERN ST.
LAWRENCE COUNTY THROPUGH 7 PM...

AT 600 PM EDT...A STRONG THUNDERSTORM WAS NEAR FOWLER...MOVING
NORTHEAST AT 20 MPH.

LOCATIONS TO BE IMPACTED INCLUDE...
CANTON...FOWLER...DEGRASSE...OSWEGATCHIE...PIERREPONT...RUSSELL...
FINE...PITCAIRN...EDWARDS...HERMON...HIGLEY FLOW STATE PARK...WEST
PIERREPONT...ALDRICH...NORTH RUSSELL...SOUTH RUSSELL...BALMAT...LOWER
OSWEGATCHIE...DE KALB JUNCTION...TALCVILLE AND EAST DE KALB.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY
CAUSE LOCALIZED PONDING OF WATER. BRIEF STRONG WIND GUSTS TO 40 MPH
ARE POSSIBLE AS WELL.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 4462 7528 4450 7485 4408 7513 4422 7545
TIME...MOT...LOC 2200Z 203DEG 19KT 4420 7533

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:09 PM EDT	Special Weather Statement	BTV	Essex	51 min
Aug 18, 6:02 PM EDT	Special Weather Statement	BTV	St. Lawrence	58 min
Aug 18, 6:58 PM EDT	Special Weather Statement	BTV	Essex	47 min
Aug 18, 7:14 PM EDT	Special Weather Statement	BTV	St. Lawrence	61 min
Aug 18, 7:17 PM EDT	Special Weather Statement	BTV	St. Lawrence	58 min

Nearby

Severe Thunderstorm Warnings in New York, 2015 Every severe thunderstorm warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.