Alert archive / Vermont / Frost Advisories in 2009

Frost Advisory 2, NWS Burlington, VT

May 12, 20094 counties in Vermont; 4 counties in New York

NWS Burlington, VT issued this frost advisory at May 12, 2009, 11:40 AM EDT for 4 counties in Vermont; 4 counties in New York. It took effect at May 13, 2009, 2:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 12, 2009, 11:40 AM EDT (15:40 UTC)
In effect from: May 13, 2009, 2:00 AM EDT
Expired: May 13, 2009, 6:15 AM EDT
In force: 4 hr
Issued by: NWS Burlington, VT

Counties Clinton County, NY, Essex County, NY, Franklin County, NY, St. Lawrence County, NY, Addison County, VT, Chittenden County, VT, Franklin County, VT, Grand Isle County, VT

The radar

The Burlington radar (KCXX), 39 km from the middle of the area, began a volume at 15:41 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

Brookhaven, NY (KOKX), launched 12:00Z, 3.7 hours before the alert went out and 411 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: 1772 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 3 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 frost advisory 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 frost advisory went out at May 12, 7:25 AM EDT, 4 hours 15 minutes earlier.

Area forecast discussion, May 12, 7:25 AM EDT, 4 hours 15 minutes before

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Hazardous weather outlook, May 12, 7:06 AM EDT, 4 hours 34 minutes before

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In the hours before

Local storm report, May 12, 8:53 AM EDT, 2 hours 47 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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Nearby

Frost Advisories in Vermont, 2009 Frost Advisories in New York, 2009 Every 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.