Alert archive / Vermont / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS Burlington, VT
NWS Burlington, VT issued this flash flood warning at Aug 26, 2021, 6:47 PM EDT for 4 counties in Vermont. It was in force for 4 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 26, 2021, 6:47 PM EDT (22:47 UTC)
- Expired
- Aug 26, 2021, 10:45 PM EDT
- In force
- 4 hr
- Issued by
- NWS Burlington, VT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Addison County, VT, Orange County, VT, Washington County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 62 km from the middle of the area, began a volume at 22:49 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 26, 8:00 PM EDT | FLASH FLOOD | 2 W Granville, VT | TEXAS FALLS ROAD WASHOUT NEAR TEXAS GAP. |
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, 10.8 hours before the alert went out and 162 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.
- Mixed-layer CAPE
- 467 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1073 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
500
WGUS51 KBTV 262247
FFWBTV
VTC001-017-023-027-270245-
/O.NEW.KBTV.FF.W.0001.210826T2247Z-210827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Burlington VT
647 PM EDT Thu Aug 26 2021
The National Weather Service in Burlington has issued a
* Flash Flood Warning for...
East Central Addison County in central Vermont...
West Central Orange County in central Vermont...
Southern Washington County in central Vermont...
Northwestern Windsor County in southern Vermont...
* Until 1045 PM EDT.
* At 647 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 2.5 inches of
rain have fallen. The expected rainfall rate is 0.5 to 1 inch in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
East Middlebury, Granville, Hancock, Ripton, Rochester, Warren,
Lincoln, Braintree, Roxbury, Salisbury, Lower Granville, Alpine
Village, Bread Loaf, East Granville and West Braintree.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4407 7299 4407 7282 4403 7272 4395 7270
4390 7274 4389 7280 4391 7293 4393 7301
4395 7308 4399 7308 4406 7301
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$2 follow-up statements
011
WGUS71 KBTV 270006
FFSBTV
Flash Flood Statement
National Weather Service Burlington VT
806 PM EDT Thu Aug 26 2021
VTC001-017-023-027-270245-
/O.CON.KBTV.FF.W.0001.000000T0000Z-210827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Addison VT-Orange VT-Washington VT-Windsor VT-
806 PM EDT Thu Aug 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT THIS
EVENING FOR EAST CENTRAL ADDISON, WEST CENTRAL ORANGE, SOUTHERN
WASHINGTON AND NORTHWESTERN WINDSOR COUNTIES...
At 806 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 5 inches of rain have
fallen. Additional rainfall amounts of 0.25 to 0.75 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
East Middlebury, Granville, Hancock, Ripton, Rochester, Warren,
Lincoln, Braintree, Roxbury, Salisbury, Lower Granville, Alpine
Village, Bread Loaf, East Granville and West Braintree.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4407 7299 4407 7282 4403 7272 4395 7270
4390 7274 4389 7280 4391 7293 4393 7301
4395 7308 4399 7308 4406 7301
FLASH FLOOD...RADAR INDICATED
$$804
WGUS71 KBTV 270240
FFSBTV
Flash Flood Statement
National Weather Service Burlington VT
1040 PM EDT Thu Aug 26 2021
VTC001-017-023-027-270250-
/O.EXP.KBTV.FF.W.0001.000000T0000Z-210827T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Addison VT-Orange VT-Washington VT-Windsor VT-
1040 PM EDT Thu Aug 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM EDT THIS EVENING FOR
EAST CENTRAL ADDISON, WEST CENTRAL ORANGE, SOUTHERN WASHINGTON AND
NORTHWESTERN WINDSOR COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4407 7299 4407 7282 4403 7272 4395 7270
4390 7274 4389 7280 4391 7293 4393 7301
4395 7308 4399 7308 4406 7301
$$The office that day
Everything else NWS Burlington, VT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 3:36 PM EDT | Special Weather Statement | BTV | Addison | 24 min |
| Aug 26, 4:53 PM EDT | Special Weather Statement | BTV | Addison | 37 min |
| Aug 26, 5:02 PM EDT | Severe Thunderstorm Warning | BTV | Addison, Orange, Washington, Windsor | 58 min |
| Aug 26, 5:59 PM EDT | Special Weather Statement | BTV | Addison | 31 min |
| Aug 26, 6:32 PM EDT | Special Weather Statement | BTV | Addison | 28 min |
Nearby
Flash Flood Warnings in Vermont, 2021Every flash flood 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.