Alert archive / Vermont / Frost Advisories in 2009

Frost Advisory 5, NWS Burlington, VT

May 31, 200910 counties in Vermont

NWS Burlington, VT issued this frost advisory at May 31, 2009, 4:00 AM EDT for 10 counties in Vermont. It took effect at Jun 1, 2009, 12:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 31, 2009, 4:00 AM EDT (08:00 UTC)
In effect from
Jun 1, 2009, 12:00 AM EDT
Expired
Jun 1, 2009, 6:01 AM EDT
In force
6 hr
Issued by
NWS Burlington, VT

Counties Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 48 km from the middle of the area, began a volume at 08:05 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, 8.0 hours before the alert went out and 213 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-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2009-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2009-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1997 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 6:47 PM EDTSpecial Weather StatementBTVAddison, Chittenden, Grand Isle, Lamoille58 min
May 31, 7:19 PM EDTSpecial Weather StatementBTVAddison, Chittenden, Lamoille, Washington56 min
May 31, 4:00 AM EDTFreeze WarningBTVClinton, Essex, Franklin, St. Lawrence26 hr

Nearby

Frost Advisories in Vermont, 2009Every frost advisory in 2009

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.