Alert archive / Vermont / Flash Flood Warnings in 2011

Flash Flood Warning 21, NWS Burlington, VT

August 10, 2011Addison County, Vermont

NWS Burlington, VT issued this flash flood warning at Aug 10, 2011, 5:44 PM EDT for Addison County, Vermont. It was in force for 3 hr. 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 10, 2011, 5:44 PM EDT (21:44 UTC)
Expired: Aug 10, 2011, 8:45 PM EDT
In force: 3 hr
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Flood severity: None

County Addison County, VT

The radar

The Burlington radar (KCXX), 56 km from the middle of the area, began a volume at 21:44 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 10, 5:55 PM EDT	FLASH FLOOD	Ripton, VT	FLOODING ON ROUTE 125 IN RIPTON

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, 9.7 hours before the alert went out and 159 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: 78 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

620 
WGUS51 KBTV 102144
FFWBTV
VTC001-110045-
/O.NEW.KBTV.FF.W.0021.110810T2144Z-110811T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
544 PM EDT WED AUG 10 2011

THE NATIONAL WEATHER SERVICE IN BURLINGTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL ADDISON COUNTY IN CENTRAL VERMONT

* UNTIL 845 PM EDT

* AT 539 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
  LINCOLN...RIPTON AND MIDDLEBURY

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...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4404 7317 4408 7295 4395 7290 4393 7316

$$

JN

1 follow-up statement

267 
WGUS71 KBTV 110042
FFSBTV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
842 PM EDT WED AUG 10 2011

VTC001-110052-
/O.EXP.KBTV.FF.W.0021.000000T0000Z-110811T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ADDISON VT-
842 PM EDT WED AUG 10 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM EDT FOR CENTRAL
ADDISON COUNTY...

THE THREAT FOR HEAVY RAINFALL AND FLASH FLOODING HAS ENDED.

LAT...LON 4404 7317 4408 7295 4395 7290 4393 7316

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:30 PM EDT	Special Weather Statement	BTV	Chittenden	60 min
Aug 10, 4:43 PM EDT	Severe Thunderstorm Warning	BTV	Addison	47 min
Aug 10, 5:32 PM EDT	Special Weather Statement	BTV	Addison, Caledonia, Orange, Washington	58 min
Aug 10, 5:56 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland, Windsor	34 min
Aug 10, 7:19 PM EDT	Special Weather Statement	BTV	Franklin	56 min

Nearby

Flash Flood Warnings in Vermont, 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.