Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 44, NWS Wilmington, NC

August 20, 2021Brunswick County, New Hanover County, North Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Aug 20, 2021, 10:30 PM EDT for Brunswick County, New Hanover County, North Carolina. It was in force for 30 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
Aug 20, 2021, 10:30 PM EDT (02:30 UTC)
Expired
Aug 20, 2021, 11:00 PM EDT
In force
30 min
Issued by
NWS Wilmington, NC
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Brunswick County, NC, New Hanover County, NC

The radar

The Wilmington radar (KLTX), 60 km from the middle of the area, began a volume at 02:32 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

TimeReportWhereRemark
Aug 20, 10:30 PM EDTTSTM WND GST 59Wilmington Intl Arpt, NC
Aug 20, 11:00 PM EDTMARINE TSTM WIND 562 Sse Myrtle Grove, NC

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

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 2.5 hours before the alert went out and 107 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-pSkew-T log-p diagram, Newport, NC at 00:00Z on 2021-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 00:00Z on 2021-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1105 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted.

042 
WUUS52 KILM 210230
SVRILM
NCC019-129-210300-
/O.NEW.KILM.SV.W.0044.210821T0230Z-210821T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Wilmington NC
1030 PM EDT Fri Aug 20 2021

The National Weather Service in Wilmington has issued a

* Severe Thunderstorm Warning for...
  New Hanover County in southeastern North Carolina...
  Northeastern Brunswick County in southeastern North Carolina...

* Until 1100 PM EDT.

* At 1030 PM EDT, a severe thunderstorm was located over Wilmington,
  moving southeast at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wilmington, Leland, Carolina Beach, Wrightsville Beach, South
  Masonboro Island, Snows Cut, Figure Eight Island, Hightsville, Cape
  Fear Community College North Campus, Wilmington International
  Airport, Myrtle Grove, Murrayville, Masonboro, Castle Hayne,
  University Of North Carolina At Wilmington, Phoenix, Ogden,
  Mayfaire, Wrightsboro and Silver Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 3417 7783 3402 7790 3427 7810 3437 7794
      3436 7794 3436 7793 3437 7793 3438 7792
      3438 7790 3437 7790 3436 7789 3438 7786
      3438 7785 3428 7773
TIME...MOT...LOC 0230Z 319DEG 16KT 3423 7789 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

VAO
1 follow-up statement
986 
WWUS52 KILM 210256
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
1056 PM EDT Fri Aug 20 2021

NCC019-129-210306-
/O.EXP.KILM.SV.W.0044.000000T0000Z-210821T0300Z/
New Hanover NC-Brunswick NC-
1056 PM EDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NEW HANOVER AND NORTHEASTERN
BRUNSWICK COUNTIES WILL EXPIRE AT 1100 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty 
winds are still possible with this thunderstorm. Frequent lightning 
is still ongoing across the area.

LAT...LON 3417 7783 3402 7790 3427 7810 3437 7794
      3436 7794 3436 7793 3437 7793 3438 7792
      3438 7790 3437 7790 3436 7789 3438 7786
      3438 7785 3428 7773
TIME...MOT...LOC 0256Z 319DEG 16KT 3414 7780 

$$

VAO

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 20, 8:19 PM EDTSpecial Weather StatementILMBladen26 min
Aug 20, 8:55 PM EDTSpecial Weather StatementILMBladen35 min
Aug 20, 9:40 PM EDTSpecial Weather StatementILMPender50 min
Aug 20, 10:17 PM EDTSpecial Weather StatementILMNew Hanover43 min
Aug 20, 10:49 PM EDTAreal Flood AdvisoryILMNew Hanover, Pender86 min
Aug 20, 10:53 PM EDTSpecial Marine WarningILM52 min
Aug 21, 5:24 AM EDTCoastal Flood AdvisoryILMNew Hanover18 hr
Aug 21, 5:26 PM EDTSpecial Weather StatementILMColumbus34 min
Aug 21, 5:31 PM EDTAreal Flood AdvisoryILMBrunswick, Columbus74 min
Aug 21, 5:57 PM EDTSpecial Weather StatementILMPender33 min
Aug 21, 6:07 PM EDTSevere Thunderstorm WarningILMBrunswick, New Hanover, Pender38 min
Aug 21, 6:11 PM EDTSpecial Weather StatementILMBladen34 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021Every 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.