Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 217, NWS Blacksburg, VA

October 25, 2021Caswell County, North Carolina; Halifax County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Oct 25, 2021, 8:16 PM EDT for Caswell County, North Carolina; Halifax County, Virginia. It was in force for 29 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: Oct 25, 2021, 8:16 PM EDT (00:16 UTC)
Expired: Oct 25, 2021, 8:45 PM EDT
In force: 29 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Caswell County, NC, Halifax County, VA

The radar

The Raleigh/Durham radar (KRAX), 108 km from the middle of the area, began a volume at 00:17 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 25, 6:26 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 0.3 hours before the alert went out and 85 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: 857 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -105 m²/s²
0-3 km storm-relative helicity: -66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

919 
WUUS51 KRNK 260016
SVRRNK
NCC033-VAC083-260045-
/O.NEW.KRNK.SV.W.0217.211026T0016Z-211026T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
816 PM EDT Mon Oct 25 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Northeastern Caswell County in north central North Carolina...
  Southwestern Halifax County in south central Virginia...

* Until 845 PM EDT.

* At 816 PM EDT, a severe thunderstorm was located over Milton, or 8
  miles southwest of Turbeville, moving east at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Turbeville...
  Milton...
  Semora...
  Alton...
  Cluster Springs...
  Virgilina...
  and Hyco Lake.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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 3657 7873 3654 7873 3654 7913 3643 7915
      3647 7928 3654 7925 3654 7922 3664 7919
      3659 7871
TIME...MOT...LOC 0016Z 285DEG 26KT 3654 7916 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KK

1 follow-up statement

691 
WWUS51 KRNK 260038
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
838 PM EDT Mon Oct 25 2021

NCC033-VAC083-260047-
/O.EXP.KRNK.SV.W.0217.000000T0000Z-211026T0045Z/
Caswell NC-Halifax VA-
838 PM EDT Mon Oct 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CASWELL AND 
SOUTHWESTERN HALIFAX COUNTIES WILL EXPIRE AT 845 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
north central North Carolina...and south central Virginia.

LAT...LON 3657 7873 3654 7873 3654 7913 3643 7915
      3647 7928 3654 7925 3654 7922 3664 7919
      3659 7871
TIME...MOT...LOC 0037Z 285DEG 26KT 3650 7899 

$$

BMG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 25, 10:20 PM EDT	Wind Advisory	RNK	Alleghany, Ashe, Surry, Watauga, Wilkes	25 hr
Oct 25, 8:06 PM EDT	Tornado Warning	RNK	Halifax, Pittsylvania	39 min
Oct 25, 8:19 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax	42 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021 Severe Thunderstorm Warnings in Virginia, 2021 Every severe thunderstorm warning in 2021

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.