Alert archive / Vermont / Flash Flood Warnings in 2023

Flash Flood Warning 41, NWS Burlington, VT

July 16, 2023Lamoille County, Orleans County, Washington County, Vermont

NWS Burlington, VT issued this flash flood warning at Jul 16, 2023, 9:56 AM EDT for Lamoille County, Orleans County, Washington County, Vermont. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 16, 2023, 9:56 AM EDT (13:56 UTC)
Expired: Jul 16, 2023, 12:07 PM EDT
In force: 2 hr
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Flood severity: None

Counties Lamoille County, VT, Orleans County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 53 km from the middle of the area, began a volume at 13:56 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

Gray, ME (KGYX), launched 12:00Z, 1.9 hours before the alert went out and 194 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: 399 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 454 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Jul 16, 6:32 AM EDT, 3 hours 24 minutes earlier.

Area forecast discussion, Jul 16, 6:32 AM EDT, 3 hours 24 minutes before

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Hazardous weather outlook, Jul 16, 3:10 AM EDT, 6 hours 46 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
Jul 16, 12:11 AM EDT	Special Weather Statement	BTV	Addison	64 min
Jul 16, 10:18 AM EDT	Flash Flood Warning	BTV	Caledonia, Essex, Orleans	2 hr
Jul 16, 3:39 PM EDT	Special Weather Statement	BTV	Chittenden	51 min
Jul 16, 5:58 PM EDT	Special Weather Statement	BTV	Chittenden	62 min
Jul 16, 6:17 PM EDT	Areal Flood Warning	BTV	Addison, Chittenden, Grand Isle, Washington	3 hr
Jul 16, 7:01 PM EDT	Special Weather Statement	BTV	Chittenden	44 min

Nearby

Flash Flood Warnings in Vermont, 2023 Every flash flood warning in 2023

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.