Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Blacksburg, VA

August 24, 2012Grayson County, Virginia

NWS Blacksburg, VA issued this special weather statement at Aug 24, 2012, 2:36 PM EDT for Grayson County, Virginia. It was in force for 54 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 24, 2012, 2:36 PM EDT (18:36 UTC)
Expired: Aug 24, 2012, 3:30 PM EDT
In force: 54 min
Issued by: NWS Blacksburg, VA

County Grayson County, VA

The radar

The Roanoke radar (KFCX), 101 km from the middle of the area, began a volume at 18:39 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 12:00Z, 6.6 hours before the alert went out and 146 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: 86 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1143 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 7 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.

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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 Aug 24, 1:41 PM EDT, 55 minutes earlier.

Area forecast discussion, Aug 24, 1:41 PM EDT, 55 minutes before

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Hazardous weather outlook, Aug 24, 4:13 AM EDT, 10 hours 23 minutes before

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In the hours before

Special weather statement, Aug 24, 2:36 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
236 PM EDT FRI AUG 24 2012

VAZ009-012-015-241930-
GRAYSON VA-SMYTH VA-WYTHE VA-
236 PM EDT FRI AUG 24 2012

...A STRONG THUNDERSTORM WITH HEAVY RAIN WILL AFFECT GRAYSON...SMYTH
AND WYTHE COUNTIES...

AT 234 PM EDT...A STRONG THUNDERSTORM WITH HEAVY RAIN WAS LOCATED 7
MILES NORTH OF INDEPENDENCE...MOVING WEST AT 10 MPH.

WIND GUSTS TO 30 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THIS STORM WILL BE NEAR ELK CREEK AROUND 245 PM...COMERS ROCK AROUND
305 PM...BRIDLE CREEK AROUND 310 PM...FLATRIDGE AROUND 325 PM AND
TROUTDALE AROUND 330 PM.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.

LAT...LON 3682 8154 3681 8104 3664 8102 3657 8138
      3658 8150

KK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 4:01 PM EDT	Special Weather Statement	RNK	Bland	59 min
Aug 24, 4:12 PM EDT	Special Weather Statement	RNK	Smyth	63 min
Aug 24, 5:17 PM EDT	Special Weather Statement	RNK	Tazewell	28 min
Aug 24, 5:27 PM EDT	Special Weather Statement	RNK	Carroll	48 min
Aug 24, 4:27 PM EDT	Special Weather Statement	RNK	Summers	33 min
Aug 24, 5:57 PM EDT	Special Weather Statement	RNK	Greenbrier	48 min
Aug 24, 6:26 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier	49 min
Aug 24, 7:01 PM EDT	Special Weather Statement	RNK	Summers	59 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.