Alert archive / Virginia / Special Weather Statements in 2020
Special Weather Statement, NWS Blacksburg, VA
NWS Blacksburg, VA issued this special weather statement at Aug 12, 2020, 4:04 PM EDT for Franklin County, Henry County, City of Martinsville, Virginia. It was in force for 56 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 12, 2020, 4:04 PM EDT (20:04 UTC)
- Expired
- Aug 12, 2020, 5:00 PM EDT
- In force
- 56 min
- Issued by
- NWS Blacksburg, VA
Counties City of Martinsville, VA, Franklin County, VA, Henry County, VA
The radar
The Roanoke radar (KFCX), 41 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 32 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.
- Mixed-layer CAPE
- 310 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 917 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted.
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</html>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 12, 2:40 PM EDT, 1 hour 24 minutes earlier.
Area forecast discussion, Aug 12, 2:40 PM EDT, 1 hour 24 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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The site you requested is temporarily down for maintenance or an unexpected outage.
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</html>Hazardous weather outlook, Aug 12, 1:42 PM EDT, 2 hours 22 minutes before
Hazardous Weather Outlook National Weather Service Blacksburg VA 142 PM EDT Wed Aug 12 2020 VAZ024-035-046-047-131745- Rockbridge-Amherst-Appomattox-Buckingham- 142 PM EDT Wed Aug 12 2020 ...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... This Hazardous Weather Outlook is for central Virginia and west central Virginia. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. In addition, an isolated strong or severe thunderstorm is possible, with damaging winds the main threat. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered to numerous thunderstorms are possible each day through Saturday and could lead to flash flooding in urban areas and flooding of creeks and streams. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NCZ001>003-018>020-VAZ007-009>012-015-016-WVZ042>044-507-508-131745- Ashe-Alleghany NC-Surry-Watauga-Wilkes-Yadkin-Tazewell-Smyth-Bland- Giles-Wythe-Grayson-Carroll-Mercer-Summers-Monroe-Eastern Greenbrier- Western Greenbrier- 142 PM EDT Wed Aug 12 2020 This Hazardous Weather Outlook is for north central North Carolina, northwest North Carolina, southwest Virginia and southeast West Virginia. .DAY ONE...This afternoon and tonight. There is a slight risk for excessive rainfall from slow moving thunderstorms that could lead to localized flash flooding this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered to numerous thunderstorms are possible each day through Saturday and could lead to flash flooding in urban areas and flooding of creeks and streams. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NCZ004>006-VAZ013-014-017>020-022-023-032>034-043>045-058-059-131745- Stokes-Rockingham-Caswell-Pulaski-Montgomery-Floyd-Craig- Alleghany VA-Bath-Roanoke-Botetourt-Patrick-Franklin-Bedford-Henry- Pittsylvania-Campbell-Halifax-Charlotte- 142 PM EDT Wed Aug 12 2020 This Hazardous Weather Outlook is for north central North Carolina, central Virginia, south central Virginia, southwest Virginia and west central Virginia. .DAY ONE...This afternoon and tonight. There is a slight risk for excessive rainfall from slow moving thunderstorms that could lead to localized flash flooding this afternoon and evening. In addition, an isolated strong or severe thunderstorm is possible, with damaging winds the main threat. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Scattered to numerous thunderstorms are possible each day through Saturday and could lead to flash flooding in urban areas and flooding of creeks and streams. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Special weather statement, Aug 12, 4:04 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service BLACKSBURG VA
404 PM EDT Wed Aug 12 2020
VAZ032-033-043-122100-
Henry-Franklin-Patrick-
404 PM EDT Wed Aug 12 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WESTERN
HENRY...EASTERN PATRICK...AND CENTRAL FRANKLIN COUNTIES ALONG
WITH THE NORTHWESTERN CITY OF MARTINSVILLE...
At 403 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Northwest Smith Mountain Lake to
Spencer. Movement was north at 20 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Martinsville...
Rocky Mount...
Ferrum...
Spencer...
Bassett...
Sydnorsville...
and Collinsville.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 3664 8020 3722 7986 3722 7983 3723 7982
3720 7976 3719 7976 3718 7972 3715 7971
3715 7970 3716 7970 3715 7969 3716 7968
3712 7965 3656 7992
TIME...MOT...LOC 2003Z 195DEG 17KT 3718 7978 3664 8001
RABThe office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:07 PM EDT | Areal Flood Advisory | RNK | Grayson | 96 min |
| Aug 11, 8:22 PM EDT | Special Weather Statement | RNK | Rockbridge, City of Lexington | 38 min |
| Aug 12, 2:10 AM EDT | Special Weather Statement | RNK | Appomattox | 35 min |
| Aug 12, 2:14 AM EDT | Areal Flood Advisory | RNK | Tazewell | 92 min |
| Aug 12, 2:42 AM EDT | Areal Flood Advisory | RNK | Amherst, Appomattox, Campbell | 3 hr |
| Aug 12, 3:16 AM EDT | Areal Flood Advisory | RNK | Buckingham | 119 min |
| Aug 12, 4:07 AM EDT | Flash Flood Watch | RNK | Amherst, Appomattox, Buckingham, Rockbridge, City of Buena Vista, City of Lexington | 19 hr |
| Aug 12, 12:58 PM EDT | Areal Flood Advisory | RNK | Grayson | 104 min |
| Aug 12, 2:25 PM EDT | Areal Flood Advisory | RNK | Carroll, Patrick | 3 hr |
| Aug 12, 2:37 PM EDT | Areal Flood Advisory | RNK | Tazewell | 3 hr |
| Aug 12, 3:11 PM EDT | Areal Flood Advisory | RNK | Giles | 3 hr |
| Aug 12, 3:15 PM EDT | Areal Flood Advisory | RNK | Smyth, Tazewell | 3 hr |
| Aug 12, 3:46 PM EDT | Flash Flood Warning | RNK | Tazewell | 4 hr |
| Aug 12, 4:38 PM EDT | Areal Flood Advisory | RNK | Franklin, Henry, Patrick | 3 hr |
| Aug 12, 6:42 PM EDT | Areal Flood Advisory | RNK | Amherst, Rockbridge, City of Buena Vista, City of Lexington | 3 hr |
| Aug 12, 7:19 PM EDT | Flash Flood Warning | RNK | Rockbridge | 3 hr |
| Aug 12, 3:19 PM EDT | Areal Flood Advisory | RNK | Alleghany, Surry, Wilkes | 3 hr |
| Aug 12, 4:00 PM EDT | Areal Flood Advisory | RNK | Watauga | 3 hr |
| Aug 12, 4:30 PM EDT | Flash Flood Warning | RNK | Watauga, Wilkes | 4 hr |
Nearby
Special Weather Statements in Virginia, 2020Every special weather statement in 2020
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.