Alert archive / South Carolina / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 63, NWS Wilmington, NC
NWS Wilmington, NC issued this severe thunderstorm warning at Sep 29, 2020, 5:32 PM EDT for Williamsburg County, South Carolina. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 29, 2020, 5:32 PM EDT (21:32 UTC)
- Expired
- Sep 29, 2020, 6:15 PM EDT
- In force
- 43 min
- Issued by
- NWS Wilmington, NC
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Williamsburg County, SC
The radar
The Wilmington radar (KLTX), 127 km from the middle of the area, began a volume at 21:31 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
Charleston AFB, SC (KCHS), launched 12:00Z, 9.5 hours before the alert went out and 84 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.
- Mixed-layer CAPE
- 480 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 781 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Wilmington, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 29, 3:29 PM EDT, 2 hours 3 minutes earlier.
Area forecast discussion, Sep 29, 3:29 PM EDT, 2 hours 3 minutes before
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</html>Hazardous weather outlook, Sep 29, 3:37 PM EDT, 1 hour 55 minutes before
Hazardous Weather Outlook National Weather Service Wilmington NC 337 PM EDT Tue Sep 29 2020 NCZ087-096-099-105-109-SCZ017-023-024-032-033-039-055-058-059-301945- Robeson-Bladen-Columbus-Inland Pender-Inland Brunswick-Marlboro- Darlington-Dillon-Florence-Marion-Williamsburg-Inland Georgetown- Central Horry-Northern Horry- 337 PM EDT Tue Sep 29 2020 This Hazardous Weather Outlook is for southeast North Carolina and northeast South Carolina. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NCZ107-301945- Inland New Hanover- 337 PM EDT Tue Sep 29 2020 ...COASTAL FLOOD ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 1 AM EDT WEDNESDAY... This Hazardous Weather Outlook is for southeast North Carolina. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Coastal Flood Advisory. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. AMZ250-252-254-256-301945- Coastal waters from Surf City to Cape Fear NC out 20 nm- Coastal waters from Cape Fear NC to Little River Inlet SC out 20 nm- Coastal waters from Little River Inlet to Murrells Inlet SC out 20 nm- Coastal waters from Murrells Inlet to South Santee River SC out 20 nm- 337 PM EDT Tue Sep 29 2020 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT WEDNESDAY... This Hazardous Weather Outlook is for the adjacent Coastal Waters. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Small Craft Advisory. Marine visibility may be reduced to less than a 1/2 NM late tonight in heavy rain showers and isolated TSTMs. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Small Craft Advisory. Small Craft Advisory likely Tuesday night through Wednesday. Periods of heavy rain Tuesday night and early Wednesday will restrict marine visibility. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NCZ106-108-110-SCZ054-056-301945- Coastal Pender-Coastal New Hanover-Coastal Brunswick-Coastal Horry- Coastal Georgetown- 337 PM EDT Tue Sep 29 2020 This Hazardous Weather Outlook is for southeast North Carolina and northeast South Carolina. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Special weather statement, Sep 29, 2:11 PM EDT, 3 hours 21 minutes before
Special Weather Statement
National Weather Service Wilmington NC
211 PM EDT Tue Sep 29 2020
NCZ105-291915-
Inland Pender NC-
211 PM EDT Tue Sep 29 2020
...SPECIAL WEATHER STATEMENT FOR NORTHEASTERN PENDER COUNTY UNTIL 315
PM EDT...
At 211 PM EDT, Doppler radar was tracking a strong thunderstorm over
Rocky Point, or 7 miles southeast of Burgaw, moving northeast at 25
mph.
Winds in excess of 30 mph will be possible with this storm.
Locations impacted include...
Burgaw, White Stocking, Rocky Point, Maple Hill, Ashton and St.
Helena.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Thunderstorms can pose a variety of threats including gusty winds,
small hail, cloud to ground lightning, and localized flooding. It is
recommended that you remain indoors until the storm passes.
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3440 7786 3449 7796 3472 7777 3472 7768
3470 7767 3451 7759
TIME...MOT...LOC 1811Z 234DEG 21KT 3446 7785
21Special weather statement, Sep 29, 5:11 PM EDT, 21 minutes before
Special Weather Statement
National Weather Service Wilmington NC
511 PM EDT Tue Sep 29 2020
SCZ017-023-024-032-033-039-292200-
Marion SC-Williamsburg SC-Marlboro SC-Dillon SC-Florence SC-
Darlington SC-
511 PM EDT Tue Sep 29 2020
...SPECIAL WEATHER STATEMENT FOR FLORENCE...SOUTHWESTERN DILLON...
DARLINGTON...NORTHWESTERN MARION...MARLBORO AND WILLIAMSBURG COUNTIES
UNTIL 600 PM EDT...
At 511 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Chesterfield to near Pinopolis. Movement
was northeast at 35 mph.
Winds in excess of 30 mph will be possible with these storms.
Locations impacted include...
Florence, Bennettsville, Hartsville, Lake City, Darlington,
Kingstree, Andrews, Timmonsville, Mccoll, Pamplico, Lamar, Quinby,
Clio, Brownsville, Cades, Darlington Raceway, Swift Creek, Nesmith,
Chavistown and Floyd.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Thunderstorms can pose a variety of threats including gusty winds,
small hail, cloud to ground lightning, and localized flooding. It is
recommended that you remain indoors until the storms pass.
&&
LAT...LON 3453 7983 3461 7978 3481 7993 3481 7968
3469 7954 3352 7950 3332 7968 3350 7996
3350 8010 3377 8000 3388 7988 3394 7997
3399 7989 3415 8015 3423 8011 3436 8018
3433 8024 3437 8029
TIME...MOT...LOC 2111Z 237DEG 29KT 3479 8004 3323 8008
VAOThe office that day
Everything else NWS Wilmington, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 2:33 AM EDT | Small Craft Advisory | ILM | 27 hr | |
| Sep 29, 4:31 AM EDT | Areal Flood Advisory | ILM | New Hanover, Pender | 110 min |
| Sep 29, 2:11 PM EDT | Special Weather Statement | ILM | Pender | 64 min |
| Sep 29, 2:51 PM EDT | Coastal Flood Advisory | ILM | New Hanover | 10 hr |
| Sep 29, 6:14 PM EDT | Special Weather Statement | ILM | Robeson | 61 min |
| Sep 29, 7:14 PM EDT | Special Weather Statement | ILM | Robeson | 61 min |
| Sep 29, 7:44 PM EDT | Special Marine Warning | ILM | 61 min | |
| Sep 29, 7:47 PM EDT | Tornado Warning | ILM | Bladen, Robeson | 12 min |
| Sep 29, 5:11 PM EDT | Special Weather Statement | ILM | Darlington, Florence, Marlboro, Williamsburg | 49 min |
| Sep 29, 6:17 PM EDT | Special Weather Statement | ILM | Williamsburg | 13 min |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2020Every severe thunderstorm warning in 2020
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.