Alert archive / Vermont / Flash Flood Watches in 2017

Flash Flood Watch 4, NWS Burlington, VT

October 28, 20177 counties in Vermont; 4 counties in New York

NWS Burlington, VT issued this flash flood watch at Oct 28, 2017, 4:20 AM EDT for 7 counties in Vermont; 4 counties in New York. It took effect at Oct 29, 2017, 8:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Oct 28, 2017, 4:20 AM EDT (08:20 UTC)
In effect from: Oct 29, 2017, 8:00 PM EDT
Expired: Oct 30, 2017, 3:46 AM EDT
In force: 8 hr
Issued by: NWS Burlington, VT
Flood severity: None

Counties Clinton County, NY, Essex County, NY, Franklin County, NY, St. Lawrence County, NY, Caledonia County, VT, Essex County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 15 km from the middle of the area, began a volume at 08:19 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 00:00Z, 8.3 hours before the alert went out and 201 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Oct 28, 4:18 AM EDT, 2 minutes earlier.

Area forecast discussion, Oct 28, 4:18 AM EDT, 2 minutes before

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Hazardous weather outlook, Oct 28, 4:08 AM EDT, 12 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 28, 2:24 PM EDT	High Wind Watch	BTV	Addison, Chittenden, Essex, Franklin, Lamoille, Orleans and 1 more	22 hr

Nearby

Flash Flood Watches in Vermont, 2017 Flash Flood Watches in New York, 2017 Every flash flood watch in 2017

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.