Alert archive / Virginia / Frost Advisories in 2007

Frost Advisory 1, NWS Blacksburg, VA

May 6, 200720 counties in Virginia; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this frost advisory at May 6, 2007, 3:43 AM EDT for 20 counties in Virginia; Mercer County, Monroe County, Summers County, West Virginia. It took effect at May 6, 2007, 6:55 PM EDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: May 6, 2007, 3:43 AM EDT (07:43 UTC)
In effect from: May 6, 2007, 6:55 PM EDT
Expired: May 7, 2007, 8:50 AM EDT
In force: 14 hr
Issued by: NWS Blacksburg, VA

All 23 counties

Alleghany County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Giles County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Wythe County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 38 km from the middle of the area, began a volume at 07:49 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.7 hours before the alert went out and 310 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: 684 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: 70 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 Blacksburg, VA wrote its last area forecast discussion before this frost advisory went out at May 6, 3:15 AM EDT, 28 minutes earlier.

Area forecast discussion, May 6, 3:15 AM EDT, 28 minutes before

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Nearby

Frost Advisories in Virginia, 2007 Frost Advisories in West Virginia, 2007 Every frost advisory in 2007

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.