Alert archive / Vermont / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Burlington, VT

July 4, 20127 counties in Vermont; Clinton County, Essex County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 4, 2012, 6:48 PM EDT for 7 counties in Vermont; Clinton County, Essex County, New York. It was in force for 57 min. 16 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 4, 2012, 6:48 PM EDT (22:48 UTC)
Expired: Jul 4, 2012, 7:45 PM EDT
In force: 57 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon

Counties Clinton County, NY, Essex County, NY, Addison County, VT, Chittenden County, VT, Lamoille County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 48 km from the middle of the area, began a volume at 22:51 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 4, 7:00 PM EDT	TSTM WND GST 70	2 Se Malletts Bay, VT	PUBLIC
Jul 4, 7:00 PM EDT	HAIL 1.25	2 Se Malletts Bay, VT	PUBLIC
Jul 4, 7:10 PM EDT	TSTM WND DMG	Malletts Bay, VT	TREES DOWN ALONG MALLETTS BAY
Jul 4, 7:15 PM EDT	TSTM WND DMG	2 N Juniper Island, VT	COUPLE OF BOATS BROKE FROM THEIR MOORINGS AND A COUPLE MORE WERE RAN AGROUND BY WINDS AND WAVES
Jul 4, 7:20 PM EDT	TSTM WND DMG	1 Wnw Essex Junction, VT	POWER LINES DOWN ON PEARL STREET IN ESSEX JUNCTION
Jul 4, 7:22 PM EDT	TSTM WND DMG	Burlington, VT	TREE DOWN ON SAINT PAUL ST IN BURLINGTON
Jul 4, 7:22 PM EDT	TSTM WND GST 63	Burlington Intl Arpt, VT
Jul 4, 7:24 PM EDT	TSTM WND DMG	1 E South Burlington, VT	UTILITY POLE FELL ONTO A SMALL AIRPLANE
Jul 4, 7:25 PM EDT	TSTM WND DMG	1 Nnw Burlington, VT	NUMEROUS TREES AND BRANCHES DOWN ON MANHATTAN DRIVE IN BURLINGTON
Jul 4, 7:25 PM EDT	TSTM WND DMG	South Burlington, VT	TREE DOWN ON WILLISTON ROAD IN SOUTH BURLINGTON
Jul 4, 7:29 PM EDT	TSTM WND GST 70	Burlington, VT	KING STREET IN DOWNTOWN BURLINGTON FLOODED
Jul 4, 7:30 PM EDT	TSTM WND DMG	1 Nnw Burlington, VT	MULTIPLE TREES DOWN ON N. CHAMPLAIN DRIVE
Jul 4, 7:30 PM EDT	TSTM WND DMG	2 Ese South Burlington, VT	2 TREES DOWN ON WILLISTON ROAD
Jul 4, 7:32 PM EDT	TSTM WND DMG	1 E South Burlington, VT	2 FOOT DIAMETER TREE UPROOTED AT THE ENTRANCE OF BURLINGTON INTERNATIONAL AIRPORT
Jul 4, 7:34 PM EDT	TSTM WND DMG	1 Sse South Burlington, VT	TREES DOWN
Jul 4, 7:47 PM EDT	TSTM WND DMG	Northfield, VT	TREES DOWN IN NORTHFIELD PER VT STATE POLICE

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
Jul 4, 6:10 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.8 hours before the alert went out and 161 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: 97 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 864 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

372 
WUUS51 KBTV 042248
SVRBTV
NYC019-031-VTC001-007-015-017-021-023-027-042345-
/O.NEW.KBTV.SV.W.0049.120704T2248Z-120704T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
648 PM EDT WED JUL 4 2012

THE NATIONAL WEATHER SERVICE IN BURLINGTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WINDSOR COUNTY IN SOUTHERN VERMONT...
  SOUTHWESTERN LAMOILLE COUNTY IN NORTHWEST VERMONT...
  WEST CENTRAL ORANGE COUNTY IN CENTRAL VERMONT...
  WESTERN WASHINGTON COUNTY IN CENTRAL VERMONT...
  EASTERN ESSEX COUNTY IN NORTHERN NEW YORK...
  SOUTH CENTRAL CLINTON COUNTY IN NORTHERN NEW YORK...
  CHITTENDEN COUNTY IN NORTHWEST VERMONT...
  ADDISON COUNTY IN CENTRAL VERMONT...
  NORTHWESTERN RUTLAND COUNTY IN SOUTHERN VERMONT...

* UNTIL 745 PM EDT.

* AT 642 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING ONE INCH DIAMETER
  HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE SEVERE STORMS
  EXTENDED FROM NORTH FAIRFAX TO CLAYBURG...AND WERE MOVING SOUTH AT
  50 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
  UNDERHILL STATE PARK...WILMINGTON...BOLTON...WEST BOLTON...
  DUXBURY...WATERBURY...MORETOWN...UNDERWOOD...ROXBURY...
  NORTHFIELD...SHOREHAM...GRANVILLE...BURLINGTON...WINOOSKI...

THIS LINE OF SEVERE THUNDERSTORMS IS ALSO PRODUCING DEADLY CLOUD TO
GROUND LIGHTNING.

WHEN YOU CAN DO SO SAFELY...PLEASE REPORT DAMAGING WINDS OR HAIL TO
THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1 800 8 6 3 4 2 7
9...OR BY SUBMITTING A STORM REPORT AT WEATHER.GOV/BURLINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GET TO SAFETY IMMEDIATELY WHEN THREATENING WEATHER APPROACHES. 
WIDESPREAD WIND DAMAGE IS EXPECTED WITH THIS LINE OF SEVERE 
THUNDERSTORMS. WINDS MAY KNOCK DOWN TREES AND POWER LINES AND DAMAGE
BUILDINGS. TAKE COVER NOW!

BOATERS ON LAKE CHAMPLAIN SHOULD SEEK SAFE HARBOR NOW! STRONG WINDS
WILL CAUSE HIGHER WAVES AND SUDDEN WIND SHIFTS MAY OVERTURN BOATS.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT THURSDAY
MORNING FOR NORTHERN NEW YORK AND WESTERN VERMONT.

&&

LAT...LON 4397 7256 4380 7338 4379 7354 4393 7364
      4407 7368 4421 7376 4448 7388 4461 7287
TIME...MOT...LOC 2246Z 340DEG 41KT 4469 7304 4453 7378

$$
LOCONTO

1 follow-up statement

988 
WWUS51 KBTV 042331
SVSBTV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
731 PM EDT WED JUL 4 2012

NYC019-031-VTC001-007-015-017-021-023-027-042345-
/O.CON.KBTV.SV.W.0049.000000T0000Z-120704T2345Z/
WINDSOR VT-LAMOILLE VT-ORANGE VT-WASHINGTON VT-ESSEX NY-CLINTON NY-
CHITTENDEN VT-ADDISON VT-RUTLAND VT-
731 PM EDT WED JUL 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHERN CLINTON AND EASTERN ESSEX COUNTIES IN NORTHERN NEW
YORK...AND ADDISON...WESTERN WASHINGTON AND WEST CENTRAL ORANGE
COUNTIES IN CENTRAL VERMONT...AND CHITTENDEN AND SOUTHWESTERN
LAMOILLE COUNTIES IN NORTHWEST VERMONT...AND NORTHWESTERN RUTLAND AND
NORTHWESTERN WINDSOR COUNTIES IN SOUTHERN VERMONT...

AT 724 PM EDT LINE OF SEVERE THUNDERSTORMS WERE PRODUCING ONE INCH
DIAMETER HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE
SEVERE STORMS EXTENDED FROM NORTH FAYSTON TO WITHERBEE...AND WERE
MOVING SOUTH AT 45 MPH.

AT 724 PM EDT...THE BURLINGTON ASOS REPORTED A 63 MPH WIND GUST. IN 
ADDITION... AT 725 PM TREES WERE REPORTED DOWN ON WILLISTON ROAD 
IN SOUTH BURLINGTON. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
  ROXBURY...EAST ROXBURY...WEST CORNWALL...RIPTON...

THESE SEVERE THUNDERSTORMS ARE ALSO CAPABLE OF PRODUCING DEADLY CLOUD
TO GROUND LIGHTNING.

WHEN YOU CAN DO SO SAFELY...PLEASE REPORT DAMAGING WINDS OR HAIL TO
THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1 800 8 6 3 4 2 7
9...OR BY SUBMITTING A STORM REPORT AT WEATHER.GOV/BURLINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIDESPREAD WIND DAMAGE IS EXPECTED WITH THIS LINE OF SEVERE 
THUNDERSTORMS. WINDS MAY KNOCK DOWN TREES AND POWER LINES AND DAMAGE
BUILDINGS. TAKE COVER NOW!

BOATERS ON LAKE CHAMPLAIN SHOULD SEEK SAFE HARBOR NOW! STRONG WINDS
WILL CAUSE HIGHER WAVES AND SUDDEN WIND SHIFTS MAY OVERTURN BOATS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT THURSDAY
MORNING FOR NORTHERN NEW YORK AND WESTERN VERMONT.

&&

LAT...LON 4397 7256 4380 7338 4379 7354 4393 7364
      4407 7368 4421 7376 4448 7388 4461 7287
TIME...MOT...LOC 2329Z 340DEG 41KT 4423 7281 4407 7355

$$

LOCONTO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 1:44 PM EDT	Special Weather Statement	BTV	Franklin, Grand Isle, Lamoille, Orleans	61 min
Jul 4, 2:29 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, Grand Isle	61 min
Jul 4, 2:40 PM EDT	Special Weather Statement	BTV	Orleans	65 min
Jul 4, 3:23 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Franklin, Lamoille, Orleans	67 min
Jul 4, 4:24 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Washington	52 min
Jul 4, 5:06 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Orange	44 min
Jul 4, 5:57 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Franklin, Grand Isle, Lamoille	63 min
Jul 4, 6:32 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Orange, Washington, Windsor	58 min
Jul 4, 7:02 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden	58 min
Jul 4, 7:35 PM EDT	Special Weather Statement	BTV	Caledonia, Lamoille, Orleans	55 min
Jul 4, 7:40 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Orange, Rutland, Washington, Windsor	65 min
Jul 4, 7:59 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden	61 min
Jul 4, 7:59 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Orange, Rutland, Washington, Windsor	61 min
Jul 4, 3:19 PM EDT	Special Weather Statement	BTV	St. Lawrence	56 min
Jul 4, 4:00 PM EDT	Severe Thunderstorm Warning	BTV	St. Lawrence	60 min
Jul 4, 5:03 PM EDT	Severe Thunderstorm Warning	BTV	St. Lawrence	57 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2012 Severe Thunderstorm Warnings in New York, 2012 Every severe thunderstorm warning in 2012

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.