Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

September 18, 20127 counties in Virginia

NWS Blacksburg, VA issued this special weather statement at Sep 18, 2012, 1:01 PM EDT for 7 counties in Virginia. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 18, 2012, 1:01 PM EDT (17:01 UTC)
Expired: Sep 18, 2012, 2:00 PM EDT
In force: 59 min
Issued by: NWS Blacksburg, VA

Counties Appomattox County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Danville, VA, Halifax County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 146 km from the middle of the area, began a volume at 17:01 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

Roanoke, VA (KRNK), launched 12:00Z, 5.0 hours before the alert went out and 75 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: 293 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 586 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 314 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Sep 18, 11:36 AM EDT, 1 hour 25 minutes earlier.

Area forecast discussion, Sep 18, 11:36 AM EDT, 1 hour 25 minutes before

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Hazardous weather outlook, Sep 18, 12:39 PM EDT, 22 minutes before

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In the hours before

Special weather statement, Sep 18, 10:35 AM EDT, 2 hours 26 minutes before

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Special weather statement, Sep 18, 10:49 AM EDT, 2 hours 12 minutes before

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Special weather statement, Sep 18, 11:36 AM EDT, 1 hour 25 minutes before

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Special weather statement, Sep 18, 11:50 AM EDT, 1 hour 11 minutes before

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Special weather statement, Sep 18, 12:33 PM EDT, 28 minutes before

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Special weather statement, Sep 18, 1:01 PM EDT, 0 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
Sep 18, 7:39 AM EDT	Special Weather Statement	RNK	Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 21 more	51 min
Sep 18, 8:38 AM EDT	Special Weather Statement	RNK	Bedford, Campbell, Charlotte, Franklin, Halifax, Henry and 4 more	52 min
Sep 18, 9:40 AM EDT	Special Weather Statement	RNK	Alleghany, Craig, Giles, Grayson, Pulaski, Wythe and 2 more	65 min
Sep 18, 9:55 AM EDT	Areal Flood Advisory	RNK	Smyth, Tazewell	5 hr
Sep 18, 10:35 AM EDT	Special Weather Statement	RNK	Carroll, Henry, Patrick, City of Martinsville	55 min
Sep 18, 10:49 AM EDT	Special Weather Statement	RNK	Botetourt, Floyd, Franklin, Montgomery, Roanoke, City of Covington and 2 more	56 min
Sep 18, 11:36 AM EDT	Special Weather Statement	RNK	Patrick	54 min
Sep 18, 11:50 AM EDT	Special Weather Statement	RNK	Amherst, Bedford, Franklin, Rockbridge, City of Buena Vista, City of Lexington and 1 more	55 min
Sep 18, 12:20 PM EDT	Areal Flood Advisory	RNK	Carroll, Floyd, Patrick	6 hr
Sep 18, 12:33 PM EDT	Special Weather Statement	RNK	Henry, Pittsylvania, City of Danville, City of Martinsville	57 min
Sep 18, 1:16 PM EDT	Areal Flood Advisory	RNK	Alleghany, Bath, City of Covington	6 hr
Sep 18, 2:14 PM EDT	Special Weather Statement	RNK	Charlotte, Halifax	46 min
Sep 18, 2:36 AM EDT	Special Weather Statement	RNK	Ashe, Watauga	54 min
Sep 18, 3:25 AM EDT	Areal Flood Advisory	RNK	Ashe, Watauga	4 hr
Sep 18, 10:21 AM EDT	Areal Flood Advisory	RNK	Ashe, Watauga	5 hr
Sep 18, 1:43 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	47 min
Sep 18, 7:04 AM EDT	Special Weather Statement	RNK	Mercer, Summers	41 min

Nearby

Special Weather Statements in Virginia, 2012 Every special weather statement 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.