Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

August 20, 20124 counties in Virginia

NWS Blacksburg, VA issued this special weather statement at Aug 20, 2012, 2:48 PM EDT for 4 counties in Virginia. It was in force for 42 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: Aug 20, 2012, 2:48 PM EDT (18:48 UTC)
Expired: Aug 20, 2012, 3:30 PM EDT
In force: 42 min
Issued by: NWS Blacksburg, VA

Counties City of Lynchburg, VA, City of Martinsville, VA, Henry County, VA, Patrick County, VA

The radar

The Roanoke radar (KFCX), 63 km from the middle of the area, began a volume at 18:49 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

Roanoke, VA (KRNK), launched 12:00Z, 6.8 hours before the alert went out and 12 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: 141 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 505 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

721 
WWUS81 KRNK 201848
SPSRNK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
248 PM EDT MON AUG 20 2012

NCZ004-VAZ032>035-043>045-201930-
AMHERST VA-BEDFORD VA-CAMPBELL VA-FRANKLIN VA-HENRY VA-PATRICK VA-
PITTSYLVANIA VA-STOKES NC-
248 PM EDT MON AUG 20 2012

...SHOWERS WITH HEAVY RAIN WILL AFFECT AMHERST...BEDFORD...
CAMPBELL...FRANKLIN...HENRY...PATRICK...PITTSYLVANIA AND STOKES
COUNTIES...

AT 245 PM EDT...SHOWERS...AND ISOLATED THUNDERSTORMS...WITH HEAVY 
RAIN WERE ALONG A LINE FROM 7 MILES WEST OF AMHERST TO PENHOOK TO 
STUART...MOVING SOUTHEAST AT 10 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE. VERY HEAVY RAIN WILL FALL...AND 
WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES 
AND SMALL STREAMS. 

THESE SHOWERS WILL BE NEAR SYDNORSVILLE AROUND 255 PM...FOREST AROUND
300 PM...FALCONERVILLE AROUND 310 PM...AJAX AROUND 320 PM...FIELDALE
AROUND 325 PM AND MADISON HEIGHTS AROUND 330 PM.

LAT...LON 3751 7899 3690 7949 3648 8021 3664 8044
      3706 7974 3765 7913

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 1:03 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	57 min
Aug 20, 1:05 PM EDT	Special Weather Statement	RNK	Bath	55 min
Aug 20, 2:12 PM EDT	Special Weather Statement	RNK	Bedford, Franklin, Patrick, City of Lynchburg	18 min
Aug 20, 2:15 PM EDT	Special Weather Statement	RNK	Alleghany, Bath, City of Covington	15 min
Aug 20, 3:34 PM EDT	Special Weather Statement	RNK	Campbell, Henry, City of Martinsville	26 min
Aug 20, 4:01 PM EDT	Special Weather Statement	RNK	Campbell, Henry, Pittsylvania, City of Martinsville	29 min
Aug 20, 4:30 PM EDT	Special Weather Statement	RNK	Pittsylvania	30 min
Aug 20, 4:32 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	28 min
Aug 20, 5:01 PM EDT	Special Weather Statement	RNK	Charlotte, Halifax, City of Danville	29 min
Aug 20, 5:04 PM EDT	Special Weather Statement	RNK	City of Buena Vista	26 min
Aug 20, 5:33 PM EDT	Special Weather Statement	RNK	Charlotte	27 min
Aug 20, 7:58 PM EDT	Areal Flood Advisory	RNK	Patrick	3 hr
Aug 20, 5:34 PM EDT	Special Weather Statement	RNK	Stokes	26 min
Aug 20, 6:14 PM EDT	Special Weather Statement	RNK	Rockingham	46 min
Aug 20, 6:35 PM EDT	Special Weather Statement	RNK	Surry	25 min
Aug 20, 7:10 PM EDT	Special Weather Statement	RNK	Rockingham	35 min
Aug 20, 7:20 PM EDT	Special Weather Statement	RNK	Stokes	25 min
Aug 20, 7:47 PM EDT	Special Weather Statement	RNK	Stokes	28 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.