Alert archive / Vermont / Flash Flood Watches in 2011
Flash Flood Watch 1, NWS Burlington, VT
NWS Burlington, VT issued this flash flood watch at Apr 27, 2011, 5:47 PM EDT for 11 counties in Vermont; 4 counties in New York. It took effect at Apr 27, 2011, 6:00 PM EDT. It was in force for 26 hr.
The area
The counties it named.
The facts
- Issued
- Apr 27, 2011, 5:47 PM EDT (21:47 UTC)
- In effect from
- Apr 27, 2011, 6:00 PM EDT
- Expired
- Apr 28, 2011, 7:34 PM EDT
- In force
- 26 hr
- Issued by
- NWS Burlington, VT
- Flood severity
- None
Counties Clinton County, NY, Essex County, NY, Franklin County, NY, St. Lawrence County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT
The radar
The Burlington radar (KCXX), 11 km from the middle of the area, began a volume at 21:47 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, 9.8 hours before the alert went out and 204 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
- 41 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Apr 27, 5:47 PM EDT, 0 minutes earlier.
Area forecast discussion, Apr 27, 5:47 PM EDT, 0 minutes before
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</html>Hazardous weather outlook, Apr 27, 4:41 AM EDT, 13 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BURLINGTON VT 441 AM EDT WED APR 27 2011 NYZ026>031-034-035-087-VTZ001>012-016>019-280845- 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- 441 AM EDT WED APR 27 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. THERE IS A CHANCE OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND TONIGHT. SOME THUNDERSTORMS WILL BE CAPABLE OF PRODUCING FREQUENT LIGHTNING...LOCALLY HEAVY DOWNPOURS...AND BRIEF GUSTY WINDS. RIVERS AND STREAMS WILL CONTINUE TO SHOW SHARP RISES TODAY DUE TO RUNOFF FROM HEAVY RAINFALL YESTERDAY AND LAST NIGHT...WITH SOME RIVERS AND STREAMS GOING INTO FLOOD OR APPROACHING BANK FULL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. A COLD FRONT WILL MOVE INTO THE REGION ON THURSDAY BRINGING MORE SHOWERS AND THUNDERSTORMS TO THE REGION. SOME THUNDERSTORMS WILL BE CAPABLE OF PRODUCING FREQUENT LIGHTNING...LOCALLY HEAVY DOWNPOURS...AND BRIEF GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The office that day
Everything else NWS Burlington, VT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 11:53 PM EDT | Areal Flood Advisory | BTV | Chittenden, Franklin, Lamoille, Orleans | 8 hr |
| Apr 27, 12:19 AM EDT | River Flood Warning | BTV | Orleans | 23 hr |
| Apr 27, 12:19 AM EDT | River Flood Warning | BTV | Lamoille | 23 hr |
| Apr 27, 1:30 AM EDT | Areal Flood Advisory | BTV | Addison, Caledonia, Chittenden, Lamoille, Orange, Washington | 6 hr |
| Apr 27, 1:47 AM EDT | River Flood Warning | BTV | Lamoille | 55 hr |
| Apr 27, 2:22 AM EDT | Areal Flood Warning | BTV | Caledonia | 8 hr |
| Apr 27, 3:31 AM EDT | River Flood Warning | BTV | Franklin | 48 hr |
| Apr 27, 3:54 AM EDT | River Flood Warning | BTV | Chittenden | 18 hr |
| Apr 27, 7:32 AM EDT | Areal Flood Warning | BTV | Chittenden | 12 hr |
| Apr 27, 9:21 AM EDT | Areal Flood Warning | BTV | Essex | 12 hr |
| Apr 27, 10:18 AM EDT | Areal Flood Warning | BTV | Caledonia | 8 hr |
| Apr 27, 4:33 PM EDT | River Flood Warning | BTV | Caledonia | 8 hr |
| Apr 26, 8:59 PM EDT | Special Weather Statement | BTV | Franklin | 2 hr |
| Apr 26, 10:44 PM EDT | River Flood Warning | BTV | Clinton, Essex | 23 hr |
| Apr 27, 3:31 AM EDT | River Flood Warning | BTV | Clinton, Franklin, St. Lawrence | 18 hr |
Nearby
Flash Flood Watches in Vermont, 2011Flash Flood Watches in New York, 2011Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.