Alert archive / Virginia / Heat Advisories in 2012

Heat Advisory 1, NWS Blacksburg, VA

June 29, 201220 counties in Virginia; 4 counties in North Carolina

NWS Blacksburg, VA issued this heat advisory at Jun 29, 2012, 3:46 AM EDT for 20 counties in Virginia; 4 counties in North Carolina. It took effect at Jun 29, 2012, 2:00 PM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jun 29, 2012, 3:46 AM EDT (07:46 UTC)
In effect from: Jun 29, 2012, 2:00 PM EDT
Expired: Jun 29, 2012, 8:04 PM EDT
In force: 6 hr
Issued by: NWS Blacksburg, VA

All 24 counties

Caswell County, NC, Rockingham County, NC, Stokes County, NC, Yadkin County, NC, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Danville, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Roanoke, VA, City of Salem, VA, Franklin County, VA, Halifax County, VA, Henry County, VA, Pittsylvania County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 67 km from the middle of the area, began a volume at 07:45 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, 7.8 hours before the alert went out and 117 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: 2717 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 464 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 heat 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 heat advisory went out at Jun 29, 3:37 AM EDT, 9 minutes earlier.

Area forecast discussion, Jun 29, 3:37 AM EDT, 9 minutes before

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Hazardous weather outlook, Jun 28, 4:11 AM EDT, 23 hours 35 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
Jun 29, 3:33 PM EDT	Excessive Heat Warning	RNK	Appomattox, Buckingham, Charlotte, Halifax, Pittsylvania, City of Danville	28 hr
Jun 29, 3:33 PM EDT	Heat Advisory	RNK	Amherst, Appomattox, Bedford, Botetourt, Campbell, Franklin and 12 more	28 hr
Jun 29, 7:01 PM EDT	Special Weather Statement	RNK	Greenbrier, Mercer, Monroe, Summers	44 min
Jun 29, 7:49 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier, Mercer, Monroe, Summers	71 min

Nearby

Heat Advisories in Virginia, 2012 Heat Advisories in North Carolina, 2012 Every heat advisory in 2012

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.