Alert archive / Virginia / Heat Advisories in 2012

Heat Advisory 5, NWS Blacksburg, VA

July 6, 201211 counties in Virginia; Caswell County, Rockingham County, North Carolina

NWS Blacksburg, VA issued this heat advisory at Jul 6, 2012, 3:59 AM EDT for 11 counties in Virginia; Caswell County, Rockingham County, North Carolina. It took effect at Jul 7, 2012, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 6, 2012, 3:59 AM EDT (07:59 UTC)
In effect from: Jul 7, 2012, 12:00 PM EDT
Expired: Jul 7, 2012, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Blacksburg, VA

Counties Caswell County, NC, Rockingham County, NC, Amherst County, VA, Appomattox County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Danville, VA, City of Lynchburg, VA, City of Martinsville, VA, Halifax County, VA, Henry County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 92 km from the middle of the area, began a volume at 07:56 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, 8.0 hours before the alert went out and 115 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: 143 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 2132 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 14 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 Jul 6, 3:48 AM EDT, 11 minutes earlier.

Area forecast discussion, Jul 6, 3:48 AM EDT, 11 minutes before

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Hazardous weather outlook, Jul 5, 11:05 PM EDT, 4 hours 54 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
Jul 6, 3:59 AM EDT	Excessive Heat Watch	RNK	Buckingham	23 hr
Jul 6, 10:27 AM EDT	Special Weather Statement	RNK	Amherst, City of Buena Vista	48 min
Jul 6, 2:26 PM EDT	Special Weather Statement	RNK	Carroll	34 min
Jul 6, 3:46 PM EDT	Special Weather Statement	RNK	Alleghany	29 min
Jul 6, 4:02 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany	41 min
Jul 6, 4:25 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany	19 min
Jul 6, 4:54 PM EDT	Special Weather Statement	RNK	Craig	36 min
Jul 6, 6:12 PM EDT	Special Weather Statement	RNK	Caswell	63 min
Jul 6, 7:14 PM EDT	Special Weather Statement	RNK	Ashe	31 min
Jul 6, 7:46 PM EDT	Special Weather Statement	RNK	Watauga	59 min
Jul 6, 7:55 PM EDT	Special Weather Statement	RNK	Watauga	35 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.