Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Wilmington, NC

August 20, 2021New Hanover County, North Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Aug 20, 2021, 2:22 PM EDT for New Hanover County, North Carolina. It was in force for 23 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: Aug 20, 2021, 2:22 PM EDT (18:22 UTC)
Expired: Aug 20, 2021, 2:45 PM EDT
In force: 23 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County New Hanover County, NC

The radar

The Wilmington radar (KLTX), 67 km from the middle of the area, began a volume at 18:21 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 nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 6.4 hours before the alert went out and 100 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: 2221 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

729 
WUUS52 KILM 201822
SVRILM
NCC129-201845-
/O.NEW.KILM.SV.W.0043.210820T1822Z-210820T1845Z/

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

The National Weather Service in Wilmington has issued a

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

* Until 245 PM EDT.

* At 221 PM EDT, a severe thunderstorm was located over Ogden, or
  near Wrightsville Beach, moving northeast at 5 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wilmington, Wrightsville Beach, Figure Eight Island, North
  Masonboro Island, Mayfaire, Murrayville, University Of North
  Carolina At Wilmington, Windemere, Bayshore, Ogden, Porters Neck,
  Landfall, Kings Grant, Seagate, Scotts Hill, Wilmington
  International Airport and Cape Fear Hospital.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3428 7774 3424 7777 3417 7782 3425 7791
      3436 7781 3432 7777 3429 7772
TIME...MOT...LOC 1821Z 235DEG 5KT 3426 7782 

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

$$

21

2 follow-up statements

668 
WWUS52 KILM 201833
SVSILM

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

NCC129-201845-
/O.CON.KILM.SV.W.0043.000000T0000Z-210820T1845Z/
New Hanover NC-
233 PM EDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR NORTHEASTERN NEW HANOVER COUNTY...

At 230 PM EDT, a severe thunderstorm was located over Ogden, or near 
Figure Eight Island, moving northeast at 5 mph. The public has 
already reported marble-sized hail and ponding on the roadway in 
Ogden. 

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

SOURCE...Radar indicated.

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

Locations impacted include...
Wilmington, Wrightsville Beach, Figure Eight Island, North Masonboro
Island, Mayfaire, Murrayville, University Of North Carolina At
Wilmington, Windemere, Bayshore, Ogden, Porters Neck, Landfall, Kings
Grant, Seagate, Scotts Hill, Wilmington International Airport and
Cape Fear Hospital.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3428 7774 3424 7777 3417 7782 3425 7791
      3436 7781 3432 7777 3429 7772
TIME...MOT...LOC 1830Z 235DEG 5KT 3427 7781 

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

$$

21

184 
WWUS52 KILM 201844
SVSILM

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

NCC129-201852-
/O.EXP.KILM.SV.W.0043.000000T0000Z-210820T1845Z/
New Hanover NC-
244 PM EDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW HANOVER
COUNTY WILL EXPIRE AT 245 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 and heavy rain are still possible with this 
thunderstorm.

LAT...LON 3428 7774 3424 7777 3417 7782 3425 7791
      3436 7781 3432 7777 3429 7772
TIME...MOT...LOC 1842Z 235DEG 5KT 3428 7779 

$$

21

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 10:45 PM EDT	Special Weather Statement	ILM	Robeson	30 min
Aug 20, 3:46 AM EDT	Small Craft Advisory	ILM		25 hr
Aug 20, 3:53 AM EDT	Coastal Flood Advisory	ILM	New Hanover	19 hr
Aug 20, 1:36 PM EDT	Special Weather Statement	ILM	New Hanover	39 min
Aug 20, 2:13 PM EDT	Special Weather Statement	ILM	New Hanover	47 min
Aug 20, 2:29 PM EDT	Areal Flood Advisory	ILM	Brunswick, New Hanover, Pender	75 min
Aug 20, 3:03 PM EDT	Special Weather Statement	ILM	New Hanover	27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.