Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 34, NWS Wilmington, NC
NWS Wilmington, NC issued this severe thunderstorm warning at Jul 18, 2021, 3:58 PM EDT for Florence County, Williamsburg County, South Carolina. It was in force for 32 min. 1 report 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 18, 2021, 3:58 PM EDT (19:58 UTC)
- Expired
- Jul 18, 2021, 4:30 PM EDT
- In force
- 32 min
- Issued by
- NWS Wilmington, NC
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Florence County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 115 km from the middle of the area, began a volume at 19:58 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 18, 4:05 PM EDT | TSTM WND DMG | 4 Ese Olanta, SC | LARGE PINE LIMBS BLOWN DOWN DURING THUNDERSTORM |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 8.0 hours before the alert went out and 91 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
- 962 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
094
WUUS52 KILM 181958
SVRILM
SCC041-089-182030-
/O.NEW.KILM.SV.W.0034.210718T1958Z-210718T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Wilmington NC
358 PM EDT Sun Jul 18 2021
The National Weather Service in Wilmington has issued a
* Severe Thunderstorm Warning for...
Southern Florence County in northeastern South Carolina...
Williamsburg County in northeastern South Carolina...
* Until 430 PM EDT.
* At 358 PM EDT, severe thunderstorms were located along a line
extending from near Woods Bay State Park to Salters, moving
northeast at 35 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...
Lake City, Kingstree, Trio, Salters, Effingham, Cades, Gourdin,
Earle, Hebron, Friendfield, Claussen, New Hope, Evergreen, Hyman,
Scranton, Coward, Olanta, Lane, Greeleyville and Central
Crossroads.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3364 8002 3372 7998 3377 8000 3382 7991
3388 7988 3388 7994 3395 7997 3399 7989
3401 7993 3417 7960 3347 7961 3341 7985
3343 7988 3344 7987 3350 7996 3350 8004
TIME...MOT...LOC 1958Z 233DEG 29KT 3394 7990 3359 7988
HAIL...1.00IN
WIND...60MPH
$$
TRA3 follow-up statements
028
WWUS52 KILM 182011
SVSILM
Severe Weather Statement
National Weather Service Wilmington NC
411 PM EDT Sun Jul 18 2021
SCC041-089-182030-
/O.CON.KILM.SV.W.0034.000000T0000Z-210718T2030Z/
Florence SC-Williamsburg SC-
411 PM EDT Sun Jul 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHERN FLORENCE AND WILLIAMSBURG COUNTIES...
At 410 PM EDT, severe thunderstorms were located along a line
extending from near Lake City to near Trio, moving northeast at 35
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vehicles is possible. Expect wind
damage to trees and power lines.
Locations impacted include...
Lake City, Kingstree, Trio, Salters, Effingham, Cades, Gourdin,
Earle, Hebron, Friendfield, Claussen, New Hope, Evergreen, Hyman,
Scranton, Coward, Olanta, Lane, Central Crossroads and Lake City
Community Hospital.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3382 7991 3388 7988 3388 7994 3395 7997
3399 7989 3401 7993 3417 7960 3347 7961
3341 7985 3343 7988 3344 7987 3350 7996
TIME...MOT...LOC 2010Z 243DEG 30KT 3393 7979 3357 7971
HAIL...1.00IN
WIND...60MPH
$$
TRA072
WWUS52 KILM 182021
SVSILM
Severe Weather Statement
National Weather Service Wilmington NC
421 PM EDT Sun Jul 18 2021
SCC041-089-182030-
/O.CON.KILM.SV.W.0034.000000T0000Z-210718T2030Z/
Florence SC-Williamsburg SC-
421 PM EDT Sun Jul 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHERN FLORENCE AND NORTH CENTRAL WILLIAMSBURG COUNTIES...
At 421 PM EDT, severe thunderstorms were located along a line
extending from near Lake City to 6 miles west of Indiantown, moving
northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines.
Locations impacted include...
Lake City, Kingstree, Cades, Friendfield, Scranton, Coward, Lake City
Community Hospital and Williamsburg Regional Hospital.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3383 7988 3390 7988 3397 7989 3399 7989
3401 7993 3402 7961 3359 7961 3357 7979
TIME...MOT...LOC 2021Z 233DEG 30KT 3388 7969 3370 7967
HAIL...<.75IN
WIND...60MPH
$$
TRA049
WWUS52 KILM 182026
SVSILM
Severe Weather Statement
National Weather Service Wilmington NC
426 PM EDT Sun Jul 18 2021
SCC041-089-182035-
/O.EXP.KILM.SV.W.0034.000000T0000Z-210718T2030Z/
Florence SC-Williamsburg SC-
426 PM EDT Sun Jul 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FLORENCE AND NORTH
CENTRAL WILLIAMSBURG COUNTIES WILL EXPIRE AT 430 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
LAT...LON 3383 7988 3390 7988 3397 7989 3399 7989
3401 7993 3402 7961 3359 7961 3357 7979
TIME...MOT...LOC 2025Z 233DEG 33KT 3391 7963 3373 7961
$$
TRAThe office that day
Everything else NWS Wilmington, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 3:05 PM EDT | Special Weather Statement | ILM | Horry | 55 min |
| Jul 18, 3:24 PM EDT | Special Weather Statement | ILM | Williamsburg | 66 min |
| Jul 18, 3:28 PM EDT | Special Weather Statement | ILM | Horry | 17 min |
| Jul 18, 4:30 PM EDT | Special Weather Statement | ILM | Florence, Marion | 30 min |
| Jul 18, 4:47 PM EDT | Special Weather Statement | ILM | Darlington, Dillon, Marlboro | 28 min |
| Jul 18, 4:56 PM EDT | Severe Thunderstorm Warning | ILM | Dillon, Florence, Horry, Marion | 34 min |
| Jul 18, 5:14 PM EDT | Special Weather Statement | ILM | Darlington | 31 min |
Nearby
Severe Thunderstorm Warnings in South 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.