Alert archive / Vermont / Flash Flood Warnings in 2011

Flash Flood Warning 23, NWS Burlington, VT

August 21, 2011Addison County, Vermont; Essex County, New York

NWS Burlington, VT issued this flash flood warning at Aug 21, 2011, 5:04 PM EDT for Addison County, Vermont; Essex County, New York. It was in force for 4 hr. 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: Aug 21, 2011, 5:04 PM EDT (21:04 UTC)
Expired: Aug 21, 2011, 8:35 PM EDT
In force: 4 hr
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Flood severity: None

Counties Essex County, NY, Addison County, VT

The radar

The Burlington radar (KCXX), 79 km from the middle of the area, began a volume at 21:06 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 21, 6:00 PM EDT	FLASH FLOOD	1 Wsw Ticonderoga, NY	WATER PONDING OVER TICONDEROGA COUNTRY CLUB
Aug 21, 6:00 PM EDT	FLASH FLOOD	Ticonderoga, NY	CHAMPLAIN AVE FLOODED

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, 9.1 hours before the alert went out and 132 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: 453 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

801 
WGUS51 KBTV 212104
FFWBTV
NYC031-VTC001-220300-
/O.NEW.KBTV.FF.W.0023.110821T2104Z-110822T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
504 PM EDT SUN AUG 21 2011

THE NATIONAL WEATHER SERVICE IN BURLINGTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ADDISON COUNTY IN CENTRAL VERMONT
  SOUTHEASTERN ESSEX COUNTY IN NORTHERN NEW YORK

* UNTIL 1100 PM EDT

* AT 500 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  EXTREMELY HEAVY RAINFALL FROM A THUNDERSTORM FALLING OVER 
  SOUTHEAST ESSEX COUNTY NEAR TICONDEROGA AND SOUTHWEST ADDISON 
  COUNTY NEAR SHOREHAM...AND WILL CAUSE FLOODING OF SMALL CREEKS AND 
  STREAMS...COUNTRY ROADS...AND FARMLAND.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  TICONDEROGA...PARADOX...MORIAH...CROWN POINT CENTER...SHOREHAM...
  SALISBURY...LEICESTER...CORNWALL...BRIDPORT...D A R STATE PARK...
  WHITING AND CROWN POINT.

IF YOU ENCOUNTER FLOODING...SEEK HIGHER GROUND IMMEDIATELY. WHEN YOU
CAN DO SO SAFELY PLEASE REPORT ANY FLOODING 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...

NEVER DRIVE THROUGH FLOODED ROADS. TURN AROUND DONT DROWN.

&&

LAT...LON 4378 7391 4420 7332 4387 7308 4380 7340
      4380 7344 4377 7376

$$

2 follow-up statements

992 
WGUS71 KBTV 212305
FFSBTV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
705 PM EDT SUN AUG 21 2011

NYC031-VTC001-220300-
/O.CON.KBTV.FF.W.0023.000000T0000Z-110822T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ESSEX NY-ADDISON VT-
705 PM EDT SUN AUG 21 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT FOR
SOUTHEASTERN ESSEX COUNTY IN NORTHERN NEW YORK...AND SOUTHWESTERN
ADDISON COUNTY IN CENTRAL VERMONT...

AT 654 PM EDT...CLUSTER OF THUNDERSTORMS WITH HEAVY RAINFALL WILL 
CONTINUE TO IMPACT SOUTHERN ESSEX COUNTY NEW YORK THROUGH EARLY THIS 
EVENING. THESE STORMS WILL CAUSE SHARP RISES ON LOCAL STREAMS AND 
RIVERS...ALONG WITH SOME WASHOUT OF DIRT ROADS IN THE HIGHER TERRAIN 
WILL BE POSSIBLE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WHITING...
LEICESTER...PARADOX...MORIAH...CROWN POINT CENTER...SHOREHAM...
CORNWALL...BRIDPORT...D A R STATE PARK AND CROWN POINT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN
THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4378 7391 4420 7332 4387 7308 4380 7340
      4380 7344 4377 7376

$$

379 
WGUS71 KBTV 220035
FFSBTV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
835 PM EDT SUN AUG 21 2011

NYC031-VTC001-220044-
/O.CAN.KBTV.FF.W.0023.000000T0000Z-110822T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ESSEX NY-ADDISON VT-
835 PM EDT SUN AUG 21 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN ESSEX
COUNTY IN NORTHERN NEW YORK...AND SOUTHWESTERN ADDISON COUNTY IN
CENTRAL VERMONT...

OCCASIONAL LIGHT RAIN WITH AN EMBEDDED RUMBLE OF THUNDER WILL BE 
POSSIBLE THROUGH 11 PM. HOWEVER...NO ADDITIONAL HEAVY RAINFALL OR 
FLASH FLOODING IS ANTICIPATED.

LAT...LON 4378 7391 4420 7332 4387 7308 4380 7340
      4380 7344 4377 7376

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 11:17 AM EDT	Special Weather Statement	BTV	Chittenden, Franklin, Grand Isle	58 min
Aug 21, 12:12 PM EDT	Special Weather Statement	BTV	Rutland, Windsor	48 min
Aug 21, 12:14 PM EDT	Special Weather Statement	BTV	Franklin, Lamoille, Orleans	61 min
Aug 21, 12:58 PM EDT	Special Weather Statement	BTV	Addison, Orange, Washington	62 min
Aug 21, 1:01 PM EDT	Special Weather Statement	BTV	Caledonia, Lamoille, Orleans	59 min
Aug 21, 1:23 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Essex, Franklin, Lamoille, Orleans, Washington	82 min
Aug 21, 1:34 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Caledonia, Orange, Rutland, Washington, Windsor	71 min
Aug 21, 3:01 PM EDT	Special Weather Statement	BTV	Essex	44 min
Aug 21, 4:17 PM EDT	Special Weather Statement	BTV	Addison	58 min
Aug 21, 4:26 PM EDT	Severe Thunderstorm Warning	BTV	Addison	64 min
Aug 21, 5:32 PM EDT	Special Weather Statement	BTV	Chittenden, Lamoille	58 min
Aug 21, 5:48 PM EDT	Special Weather Statement	BTV	Addison, Washington	57 min
Aug 21, 5:58 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Orange, Rutland, Washington, Windsor	62 min
Aug 21, 5:59 PM EDT	Severe Thunderstorm Warning	BTV	Rutland, Windsor	61 min
Aug 21, 6:01 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Franklin, Lamoille, Orleans	36 min
Aug 21, 7:01 PM EDT	Severe Thunderstorm Warning	BTV	Rutland, Windsor	29 min
Aug 21, 2:13 PM EDT	Special Weather Statement	BTV	St. Lawrence	62 min
Aug 21, 3:54 PM EDT	Special Weather Statement	BTV	Franklin	66 min
Aug 21, 4:53 PM EDT	Special Weather Statement	BTV	Franklin	52 min

Nearby

Flash Flood Warnings in Vermont, 2011 Flash Flood Warnings in New York, 2011 Every flash flood warning in 2011

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.