Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 89, NWS Blacksburg, VA

July 17, 2021Caswell County, Rockingham County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 17, 2021, 4:00 PM EDT for Caswell County, Rockingham County, North Carolina. It was in force for 60 min. 2 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: Jul 17, 2021, 4:00 PM EDT (20:00 UTC)
Expired: Jul 17, 2021, 5:00 PM EDT
In force: 60 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Caswell County, NC, Rockingham County, NC

The radar

The Roanoke radar (KFCX), 100 km from the middle of the area, began a volume at 20:02 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
Jul 17, 4:05 PM EDT	TSTM WND DMG	6 Wsw Camp Springs, NC	A COUPLE TREES DOWN.
Jul 17, 4:30 PM EDT	TSTM WND DMG	4 S Lawsonville, NC	TWO LARGE TREE LIMBS DOWN.

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.0 hours before the alert went out and 50 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: 966 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

716 
WUUS51 KRNK 172000
SVRRNK
NCC033-157-172100-
/O.NEW.KRNK.SV.W.0089.210717T2000Z-210717T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
400 PM EDT Sat Jul 17 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Southeastern Rockingham County in north central North Carolina...
  Central Caswell County in north central North Carolina...

* Until 500 PM EDT.

* At 400 PM EDT, a severe thunderstorm was located over Harrisons
  Crossroads, or near Reidsville, moving east at 15 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...
  Reidsville...
  Wentworth...
  Yanceyville...
  Bethel...
  Providence...
  Camp Springs...
  and Jericho.

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 3625 7970 3642 7972 3654 7931 3654 7929
      3631 7919
TIME...MOT...LOC 2000Z 248DEG 13KT 3640 7965 

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

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 1:06 PM EDT	Special Weather Statement	RNK	Surry	39 min
Jul 17, 1:45 PM EDT	Severe Thunderstorm Warning	RNK	Surry	43 min
Jul 17, 2:11 PM EDT	Areal Flood Advisory	RNK	Surry	3 hr
Jul 17, 2:49 PM EDT	Special Weather Statement	RNK	Caswell	26 min
Jul 17, 2:56 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	49 min
Jul 17, 3:42 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	48 min
Jul 17, 3:48 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	57 min
Jul 17, 3:52 PM EDT	Areal Flood Advisory	RNK	Caswell, Rockingham	3 hr
Jul 17, 4:11 PM EDT	Flash Flood Warning	RNK	Caswell, Rockingham	3 hr
Jul 17, 5:00 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	60 min
Jul 17, 5:10 PM EDT	Special Weather Statement	RNK	Wilkes	35 min
Jul 17, 5:39 PM EDT	Special Weather Statement	RNK	Wilkes	36 min
Jul 17, 6:02 PM EDT	Special Weather Statement	RNK	Caswell	13 min
Jul 17, 6:08 PM EDT	Special Weather Statement	RNK	Alleghany, Surry, Watauga, Wilkes	67 min
Jul 17, 6:50 PM EDT	Areal Flood Advisory	RNK	Caswell, Rockingham	7 hr
Jul 17, 7:05 PM EDT	Special Weather Statement	RNK	Alleghany, Surry	40 min
Jul 17, 7:10 PM EDT	Areal Flood Advisory	RNK	Alleghany, Surry	3 hr
Jul 17, 7:34 PM EDT	Special Weather Statement	RNK	Yadkin	26 min
Jul 17, 7:44 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Rockingham, Stokes, Surry, Wilkes, Yadkin	61 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.