Alert archive / Virginia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 49, NWS Blacksburg, VA

May 11, 2017Charlotte County, Halifax County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 11, 2017, 6:08 PM EDT for Charlotte County, Halifax County, Virginia. It was in force for 67 min. 1 report 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 11, 2017, 6:08 PM EDT (22:08 UTC)
Expired: May 11, 2017, 7:15 PM EDT
In force: 67 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Charlotte County, VA, Halifax County, VA

The radar

The Raleigh/Durham radar (KRAX), 122 km from the middle of the area, began a volume at 22:09 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 11, 6:22 PM EDT	HAIL 0.5	2 Ese Crystal Hill, VA	HAIL THE SIZE OF A DIME OBSERVED ON CLAYS MILL SCHOOL ROAD

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 12:00Z, 10.1 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1015 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

434 
WUUS51 KRNK 112208
SVRRNK
VAC037-083-112315-
/O.NEW.KRNK.SV.W.0049.170511T2208Z-170511T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
608 PM EDT THU MAY 11 2017

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Southern Charlotte County in south central Virginia...
  Central Halifax County in south central Virginia...

* Until 715 PM EDT

* At 607 PM EDT, a severe thunderstorm was located over Nathalie,
  moving southeast at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to trees and power lines. 

* Locations impacted include...
  South Boston...
  Halifax...
  Redoak...
  Clover...
  and Nathalie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and 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 3670 7865 3669 7864 3669 7868 3668 7870
      3667 7870 3665 7871 3659 7872 3654 7876
      3689 7913 3690 7913 3702 7901 3685 7852
TIME...MOT...LOC 2207Z 299DEG 13KT 3691 7899 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Loconto

2 follow-up statements

333 
WWUS51 KRNK 112233
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
633 PM EDT THU MAY 11 2017

VAC037-083-112315-
/O.CON.KRNK.SV.W.0049.000000T0000Z-170511T2315Z/
Charlotte VA-Halifax VA-
633 PM EDT THU MAY 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR
SOUTH CENTRAL CHARLOTTE AND CENTRAL HALIFAX COUNTIES...

At 632 PM EDT, a severe thunderstorm was located over Crystal Hill,
moving southeast at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
South Boston...
Halifax...
Redoak...
Clover...
and Scottsburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Banister Lake or John H Kerr Reservoir, get away from 
the water and move indoors or inside a vehicle. remember, lightning 
can strike out to 15 miles from the parent thunderstorm. If you can 
hear thunder, you are close enough to be struck by lightning. Move 
to safe shelter now!  Do not be caught on the water in a 
thunderstorm.

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 3681 7904 3697 7888 3696 7883 3680 7856
      3670 7865 3669 7864 3669 7868 3668 7870
      3667 7870 3665 7871 3659 7872 3654 7876
      3657 7879
TIME...MOT...LOC 2232Z 302DEG 15KT 3683 7886 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Loconto

055 
WWUS51 KRNK 112309
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
709 PM EDT THU MAY 11 2017

VAC037-083-112318-
/O.EXP.KRNK.SV.W.0049.000000T0000Z-170511T2315Z/
Charlotte VA-Halifax VA-
709 PM EDT THU MAY 11 2017

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTH CENTRAL CHARLOTTE AND CENTRAL HALIFAX COUNTIES WILL EXPIRE AT
715 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

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 3681 7904 3697 7888 3696 7883 3680 7856
      3670 7865 3669 7864 3669 7868 3668 7870
      3667 7870 3665 7871 3659 7872 3654 7876
      3657 7879
TIME...MOT...LOC 2308Z 299DEG 13KT 3679 7876 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 8:06 PM EDT	Tornado Warning	RNK	Campbell	39 min
May 10, 8:34 PM EDT	Tornado Warning	RNK	Campbell, Charlotte, Halifax	26 min
May 10, 8:45 PM EDT	Severe Thunderstorm Warning	RNK	Campbell, Charlotte, Halifax	60 min
May 10, 8:58 PM EDT	Tornado Warning	RNK	Halifax	32 min
May 10, 9:19 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax	41 min
May 10, 9:37 PM EDT	Special Weather Statement	RNK	Appomattox, City of Lynchburg	53 min
May 10, 9:45 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Campbell, Charlotte, City of Lynchburg	60 min
May 10, 10:43 PM EDT	Special Weather Statement	RNK	Charlotte	62 min
May 10, 11:20 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte	16 min
May 11, 6:19 AM EDT	Flood Watch	RNK	Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 23 more	30 hr
May 11, 6:19 AM EDT	Flash Flood Watch	RNK	Alleghany, Bath, Bland, Botetourt, Craig, Giles and 5 more	16 hr
May 11, 6:38 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	67 min
May 11, 6:49 PM EDT	Special Weather Statement	RNK	Bedford	56 min
May 11, 7:15 PM EDT	Special Weather Statement	RNK	Patrick	60 min
May 11, 7:18 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	57 min
May 11, 7:28 PM EDT	Severe Thunderstorm Warning	RNK	Henry, City of Martinsville	62 min

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.