Alert archive / Virginia / Frost Advisories in 2006

Frost Advisory 4, NWS Blacksburg, VA

October 13, 200611 counties in Virginia; 6 counties in North Carolina

NWS Blacksburg, VA issued this frost advisory at Oct 13, 2006, 4:41 AM EDT for 11 counties in Virginia; 6 counties in North Carolina. It took effect at Oct 13, 2006, 3:48 PM EDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Oct 13, 2006, 4:41 AM EDT (08:41 UTC)
In effect from: Oct 13, 2006, 3:48 PM EDT
Expired: Oct 14, 2006, 8:00 AM EDT
In force: 16 hr
Issued by: NWS Blacksburg, VA

Counties Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Wilkes County, NC, Yadkin County, NC, Charlotte County, VA, City of Danville, VA, City of Martinsville, VA, City of Roanoke, VA, City of Salem, VA, Franklin County, VA, Halifax County, VA, Henry County, VA, Patrick County, VA, Pittsylvania County, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 49 km from the middle of the area, began a volume at 08:44 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 8.7 hours before the alert went out and 69 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: 1784 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 344 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 Oct 13, 3:57 AM EDT, 44 minutes earlier.

Area forecast discussion, Oct 13, 3:57 AM EDT, 44 minutes before

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Hazardous weather outlook, Oct 12, 10:42 PM EDT, 5 hours 59 minutes before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 12, 10:20 PM EDT	Frost Advisory	RNK	Bland, Carroll, Craig, Floyd, Giles, Montgomery and 9 more	10 hr
Oct 13, 3:48 PM EDT	Freeze Warning	RNK	Amherst, Appomattox, Bedford, Botetourt, Buckingham, Campbell and 1 more	16 hr

Nearby

Frost Advisories in Virginia, 2006 Frost Advisories in North Carolina, 2006 Every frost advisory in 2006

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.