Alert archive / Virginia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 39, NWS Blacksburg, VA

May 5, 20174 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 5, 2017, 5:14 AM EDT for 4 counties in Virginia. It was in force for 58 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 5, 2017, 5:14 AM EDT (09:14 UTC)
Expired: May 5, 2017, 6:12 AM EDT
In force: 58 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Amherst County, VA, Appomattox County, VA, Buckingham County, VA, Campbell County, VA

The radar

The Roanoke radar (KFCX), 151 km from the middle of the area, began a volume at 09:18 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.

What was reported inside it

Time	Report	Where	Remark
May 5, 5:16 AM EDT	TSTM WND DMG	4 Ene Amherst, VA	EM REPORTED STRAIGHT LINE WIND DAMAGE. SEVERAL TREES DOWN ON BOXWOOD FARM RD. TIME RADAR ESTIMATED.
May 5, 5:18 AM EDT	TSTM WND DMG	2 Wnw Red House, VA	THUNDERSTORM WINDS BLEW A TREE DOWN ALONG LAWYERS ROAD NEAR RED HOUSE.
May 5, 5:24 AM EDT	TSTM WND DMG	6 S Appomattox, VA	TREE DOWN ON CUB CREEK RD. TIME RADAR ESTIMATED.
May 5, 5:35 AM EDT	TSTM WND DMG	3 E Evergreen, VA	TREE DOWN ON ROCK CHURCH RD. TIME RADAR ESTIMATED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 9.2 hours before the alert went out and 80 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: 5 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 347 m²/s²
0-3 km storm-relative helicity: 487 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

389 
WUUS51 KRNK 050914
SVRRNK
VAC009-011-029-031-051030-
/O.NEW.KRNK.SV.W.0039.170505T0914Z-170505T1030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
514 AM EDT FRI MAY 5 2017

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Appomattox County in central Virginia...
  Eastern Campbell County in central Virginia...
  Southeastern Amherst County in central Virginia...
  Buckingham County in central Virginia...

* Until 630 AM EDT

* At 514 AM EDT, severe thunderstorms were located along a line
  extending from Amherst to near Spring Mills, moving northeast at 40
  mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Buckingham...
  Amherst...
  Appomattox...
  Brookneal...
  and Dillwyn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for damaging winds. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3734 7846 3733 7852 3740 7859 3726 7868
      3720 7882 3711 7887 3704 7895 3761 7912
      3768 7897 3755 7890 3754 7883 3763 7882
      3764 7872 3770 7869 3768 7864 3775 7862
      3776 7851 3780 7849 3775 7844 3769 7824
TIME...MOT...LOC 0914Z 234DEG 34KT 3759 7904 3725 7901 

HAIL...<.75IN
WIND...60MPH
 
$$

RS

3 follow-up statements

336 
WWUS51 KRNK 050932
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
532 AM EDT FRI MAY 5 2017

VAC009-031-050941-
/O.CAN.KRNK.SV.W.0039.000000T0000Z-170505T1030Z/
Campbell VA-Amherst VA-
532 AM EDT FRI MAY 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR 
EASTERN CAMPBELL AND SOUTHEASTERN AMHERST COUNTIES IS CANCELLED...

The storms which prompted the warning has moved out of the warned 
area. Therefore, the warning has been cancelled.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

LAT...LON 3734 7846 3733 7852 3740 7859 3726 7868
      3723 7878 3720 7882 3753 7890 3754 7886
      3754 7882 3763 7882 3764 7872 3770 7869
      3768 7866 3768 7864 3775 7862 3776 7851
      3780 7849 3776 7847 3775 7844 3769 7824
TIME...MOT...LOC 0931Z 229DEG 37KT 3766 7882 3732 7879 

$$

VAC011-029-051030-
/O.CON.KRNK.SV.W.0039.000000T0000Z-170505T1030Z/
Appomattox VA-Buckingham VA-
532 AM EDT FRI MAY 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM EDT
FOR APPOMATTOX AND BUCKINGHAM COUNTIES...

At 531 AM EDT, severe thunderstorms were located along a line
extending from near Shipman to Evergreen, moving northeast at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Buckingham...
Appomattox...
Dillwyn...
Bent Creek...
and Pamplin City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for DAMAGING WINDS. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3734 7846 3733 7852 3740 7859 3726 7868
      3723 7878 3720 7882 3753 7890 3754 7886
      3754 7882 3763 7882 3764 7872 3770 7869
      3768 7866 3768 7864 3775 7862 3776 7851
      3780 7849 3776 7847 3775 7844 3769 7824
TIME...MOT...LOC 0931Z 229DEG 37KT 3766 7882 3732 7879 

HAIL...<.75IN
WIND...60MPH
 
$$

RS

388 
WWUS51 KRNK 051003
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
603 AM EDT FRI MAY 5 2017

VAC011-051012-
/O.CAN.KRNK.SV.W.0039.000000T0000Z-170505T1030Z/
Appomattox VA-
603 AM EDT FRI MAY 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR 
APPOMATTOX COUNTY IS CANCELLED...

The storms which prompted the warning has weakened. Therefore, the 
warning has been cancelled.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

LAT...LON 3734 7846 3768 7866 3768 7864 3775 7862
      3776 7851 3776 7847 3775 7844 3769 7824
TIME...MOT...LOC 1002Z 231DEG 35KT 3769 7861 3745 7843 

$$

VAC029-051030-
/O.CON.KRNK.SV.W.0039.000000T0000Z-170505T1030Z/
Buckingham VA-
603 AM EDT FRI MAY 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM EDT
FOR CENTRAL BUCKINGHAM COUNTY...

At 602 AM EDT, severe thunderstorms were located along a line
extending from near Centenary to near Guinea Mills, moving northeast
at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Buckingham...
Dillwyn...
New Canton...
Gold Hill...
and Centenary.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for DAMAGING WINDS. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3734 7846 3768 7866 3768 7864 3775 7862
      3776 7851 3776 7847 3775 7844 3769 7824
TIME...MOT...LOC 1002Z 231DEG 35KT 3769 7861 3745 7843 

HAIL...<.75IN
WIND...60MPH
 
$$

RS

434 
WWUS51 KRNK 051012
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
612 AM EDT FRI MAY 5 2017

VAC029-051022-
/O.CAN.KRNK.SV.W.0039.000000T0000Z-170505T1030Z/
Buckingham VA-
612 AM EDT FRI MAY 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR 
CENTRAL BUCKINGHAM COUNTY IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

LAT...LON 3734 7846 3768 7866 3768 7864 3775 7862
      3776 7851 3776 7847 3775 7844 3769 7824
TIME...MOT...LOC 1009Z 234DEG 34KT 3792 7821 3768 7803 

$$

RS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 9:03 PM EDT	Special Weather Statement	RNK	Alleghany, Amherst, Bath, Botetourt, Rockbridge, City of Buena Vista and 3 more	87 min
May 4, 9:33 PM EDT	Special Weather Statement	RNK	Carroll, Grayson, Smyth, Wythe, City of Galax	57 min
May 5, 2:16 AM EDT	Areal Flood Warning	RNK	Carroll, Floyd, Franklin, Grayson, Patrick, City of Galax	6 hr
May 5, 3:15 AM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	45 min
May 5, 3:36 AM EDT	Severe Thunderstorm Warning	RNK	Henry, Pittsylvania, City of Danville	54 min
May 5, 3:45 AM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Franklin, Henry, Pittsylvania	60 min
May 5, 4:31 AM EDT	Severe Thunderstorm Warning	RNK	Halifax	59 min
May 5, 4:40 AM EDT	Special Weather Statement	RNK	Campbell	65 min
May 5, 4:56 AM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax	42 min
May 5, 5:07 AM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax	23 min
May 5, 7:06 AM EDT	Areal Flood Advisory	RNK	Roanoke, City of Roanoke, City of Salem	6 hr
May 5, 7:22 AM EDT	Areal Flood Warning	RNK	Rockbridge, City of Lexington	6 hr
May 5, 8:16 AM EDT	Areal Flood Warning	RNK	Rockbridge, City of Buena Vista	6 hr
May 5, 2:59 PM EDT	River Flood Warning	RNK	Charlotte, Halifax	64 hr
May 5, 2:59 PM EDT	River Flood Warning	RNK	Pittsylvania, City of Danville	32 hr
May 5, 2:59 PM EDT	River Flood Warning	RNK	Halifax	48 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.